JP2003234090A - High-pressure discharge lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a high-pressure discharge lamp from changing in an emitting color or from being extinguished due to the rise of the lamp voltage, by suppressing reduction of the sodium sealed in a light emitting tube in the lamp particularly having a long lifetime. <P>SOLUTION: The high-pressure discharge lamp comprises the light emitting tube 6 having electrodes 10 at both ends, a starter 7 connected in parallel with the tube 6, and an auxiliary starter conductor 8 attached to an outer surface of the tube 6. In this lamp, the starter 7 has a heat responsive cut-off switch 13 for transferring the conductor 8 to an electrically cut-off state after the tube 6 is started, and a heating resistor 15 provide near the switch 13 to open the switch 13. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a high pressure discharge lamp.

[0002]

2. Description of the Related Art In recent years, high-pressure discharge lamps, such as high-pressure sodium lamps, are more than twice as efficient as high-pressure mercury lamps.
It is widely used for outdoor lighting such as open spaces and streets, and for indoor lighting such as factories and gymnasiums.

In general, a high-pressure sodium lamp has an outer tube, electrodes provided at both ends thereof, and an arc tube in which sodium amalgam and xenon are sealed, and a starter connected in parallel to the arc tube. And a starting auxiliary conductor for suppressing an increase in starting voltage are attached to the outer surface of the arc tube. If a specific potential is applied to this starting auxiliary conductor during steady lighting, the sodium enclosed in the arc tube will disappear from the arc tube, so the starting auxiliary conductor is electrically shut off during steady lighting. Is maintained at or near the specified state.

Among high-pressure sodium lamps, the xenon filling pressure in the arc tube is 26 kP.
a-45 kPa high-pressure sodium lamp (hereinafter referred to as "high-pressure xenon type high-pressure sodium lamp")
In addition to being highly efficient, it is also possible to prevent the electron emission material applied to one electrode from scattering due to ion bombardment from the other electrode when the lamp is started, so it has excellent life characteristics and a long life. It has achieved over 12,000 hours (rated life time).

Since such a high-pressure xenon type high-pressure sodium lamp can replace an existing high-pressure mercury lamp and is low in cost, a copper-iron type reactance ballast for the high-pressure mercury lamp is generally used. It is used in combination with the provided lighting circuit.

Next, two types of starting devices conventionally used in such a high-pressure sodium lamp will be described.

As shown in FIG. 5, the first type of starting device 30 is a normal temperature closed thermal responsive switch 14 made of bimetal, and a thermal responsive switch 14 for limiting current and blocking current. It has a series circuit with the heating resistor 15 for opening the heater (Japanese Patent Application Laid-open No. 59-59).
-850 publication). One end of a starting auxiliary conductor 8 attached to the outer surface of the arc tube 6 is closed at room temperature and is connected to one electrode (not shown) of the arc tube 6 via a thermoresponsive switch 31 made of bimetal. .

Next, a high-pressure xenon type high-pressure sodium lamp 32 incorporating this type of starting device 30.
A copper-iron type reactance stabilizer for a high pressure mercury lamp 17
The operation of the starting device 30 in the case of lighting in combination with the lighting circuit 18 provided with will be described.

When the AC power supply voltage 19 is applied to the high-pressure sodium lamp 32, the current interrupting thermal responsive switch 14 is opened by the heating resistor 15. The current is cut off by this opening operation, and the copper-iron type reactance stabilizer 17
A high-voltage pulse voltage of 3 kV to 4 kV is induced in. The induced high voltage pulse voltage and the effect of lowering the starting voltage by the starting auxiliary conductor 8 start the arc tube 6.

Immediately after starting the arc tube 6, the opening / closing operation of the thermal interrupt switch 14 for current interruption is stopped. Then, 1 to 3 minutes after the start of the start, the thermal interrupting switch 14 for cutting off the current is opened by the heat radiation from the arc tube 6, and the starting device 30 is opened from the lighting circuit 18. On the other hand, the heat responsive switch 31 is opened 5 to 7 minutes after the start of the heat radiation to release the heat from the arc tube 6, and the start auxiliary conductor 8 is electrically cut off.

Here, in the operation of the starting device 30, the time from the start of starting of the arc tube 6 to the open state of the heat responsive switch 14 for current interruption is 1 to 3 minutes, whereas the heat responsive switch 14 is in thermal operation. The switch 31 is set so that the time from the start of starting the arc tube 6 to the open state is as long as 5 minutes to 7 minutes. The reason is as follows. That is, when the lamp is restarted, the time required for the thermal response switch 31 to return from the open state to the closed state is set to be shorter than the return time for the current interruption thermal response switch 14. As a result, when the current interrupting thermal responsive switch 14 performs the opening / closing operation when the lamp is restarted, the thermal responsive switch 31 is always in the closed state, and the starting auxiliary conductor 8 functions normally.

Next, as shown in FIG. 6, the starter 33 of the second type is a thermostat switch 21 for opening the starter which is closed at room temperature and made of bimetal, and a current limiting resistor made of a tungsten filament. 22. A pulse-responsive thermoresponsive switch 34 which is closed at room temperature and is made of bimetal, a non-linear ceramic capacitor element 23 (NCC element) for interrupting current, and a voltage detection type switching element 25 which is a bidirectional semiconductor switching element. A heating resistor 35 connected in parallel to the connected series circuit, the pulse stop thermal response switch 34, the NCC element 23, and the voltage detection type switching element 25.
A bypass resistor 36 connected in parallel to the pulse-stopping thermal responsive switch 34 for preventing deterioration of the NCC element 23 due to a pyroelectric current, and a high-voltage pulse connected in parallel to the voltage detection type switching element 25. It has a control resistor 37 for stabilizing the oscillation phase.

One end of the starting auxiliary conductor 8 is connected to one electrode (not shown) of the arc tube 6 through a small capacity capacitor 38 of 1 nF, for example.

The thermal response switch 34 for stopping the pulse is used.
Has a function of being opened by the heating resistor 35 to stop the pulse oscillation when the lamp is turned off.

Next, as shown in FIG. 6, a high-pressure xenon-type high-pressure sodium lamp 39 having a built-in starting device 33 of this type is combined with a lighting circuit 18 having a copper-iron reactance ballast 17 for lighting. The operation of the starting device 33 in the case of causing it will be described.

When the AC power supply voltage 19 is applied to the high voltage sodium lamp 39, a high voltage pulse voltage of about 2 kV is induced in the reactance ballast 17 every half cycle by the current switching operation of the NCC element 23. The induced high voltage pulse voltage and the effect of lowering the starting voltage by the starting auxiliary conductor 8 start the arc tube 6.

Immediately after starting the arc tube 6, the NCC element 23
The voltage applied to the NCC element 23 decreases, the current switching operation of the NCC element 23 is disabled, and the high-voltage pulse voltage oscillation is stopped.

Next, the heat-dissipating switch 21 for opening the starting device is opened by the heat radiation from the arc tube 6, and the starting device 33 is opened from the lighting circuit 18. This open state is maintained during steady lighting. On the other hand, the starting auxiliary conductor 8
Is maintained in the same state as being electrically cut off by the small-capacity capacitor 38 during steady lighting.

[0019]

However, in such a conventional high-pressure xenon-type starter built-in high-pressure sodium lamp, the outer surface of the arc tube 6 is burned after the rated life exceeds 12,000 hours, for example, 16,000 hours. Of these, black spots, which are traces of the disappearance of the sodium enclosed in the arc tube 6, are observed in the vicinity of the starting auxiliary conductor 8 attached, and the change in the emission color of the lamp due to the disappearance of sodium (color temperature decrease) ), And there is a problem that the lamp goes out due to an increase in the lamp voltage.

The high-pressure sodium lamp with a built-in high-pressure xenon type starter has a relatively stable life characteristic, and the actual life time of the lamp in the market almost exceeds the rated value. Therefore, in the high-pressure xenon type high-pressure sodium lamp with a built-in starter, the lamp failure due to the disappearance of sodium has been a serious problem in terms of market quality.

The present invention has been made to solve such a problem, and particularly in a high pressure discharge lamp having a long lamp life, it is possible to suppress the disappearance of sodium contained in the arc tube, and It is an object of the present invention to provide a high-pressure discharge lamp capable of preventing the occurrence of extinguishing due to a change in the color of emitted light and an increase in lamp voltage.

[0022]

The high-pressure discharge lamp of the present invention comprises an arc tube having electrodes at both ends, a starting device connected in parallel to the arc tube, and a starter attached to the outer surface of the arc tube. An auxiliary conductor, the starting device, after starting the arc tube, a thermal interrupting switch for electrically disconnecting the starting auxiliary conductor, and is provided in proximity to the thermal interrupting switch, And a heating resistor for opening the shut-off thermally responsive switch.

As a result, after the starting of the arc tube is started, the thermal interrupting switch is heated by the heating resistor, so that the thermal interrupting switch can be quickly opened, so that the auxiliary starting conductor is electrically connected. It is possible to quickly shift to the cutoff state. As a result, particularly in a long-life high-pressure sodium lamp having a rated life of more than 12,000 hours, it is possible to suppress the disappearance of sodium enclosed in the arc tube even after the elapsed lighting time exceeds the rated life, and thus the disappearance of sodium. It is possible to prevent the occurrence of extinguishing due to a change in the color of light emitted from the lamp and an increase in the lamp voltage due to the above.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

The first embodiment of the present invention is a high pressure sodium lamp having a rated power of 360 W and having a built-in starter,
As shown in FIG. 1, an outer tube 2 made of, for example, hard glass, one end of which is closed and the other end of which is sealed by a stem 1.
And E attached to the end of the outer tube 2 on the side of the stem 1.
The base 3 and the arc tube 6 which is built in the outer tube 2 and is connected to and held by the two long and short stem wires 4 and 5 derived from the stem 1, and the arc tube 6 which is also built in the outer tube 2 and emits light. A starter 7 connected in parallel with the tube 6 and a starter auxiliary conductor 8 made of molybdenum wound around and attached to the outer surface of the arc tube 6 are provided.

The outer tube 2 is vacuumed or filled with an inert gas.

As shown in FIG. 2, the envelope 9 of the arc tube 6
Is made of polycrystalline alumina ceramic and has an inner diameter of 7.4.
mm, and a wall thickness of 0.8 mm. Further, the electrodes 10 made of tungsten are provided at both ends of the arc tube 6.
The niobium tube 11 connected to is sealed airtight by the ceramic cement 12. The electrode 10 is coated with an electron emitting substance (not shown). The distance between the electrodes 10 is 86 mm. Further, 22 mg of sodium amalgam (30 wt% of sodium) and 30 kPa of xenon are enclosed in the arc tube 6.

As shown in FIG. 3, the starting device 7 is closed at room temperature, and is made of a bimetal for switching the auxiliary starting conductor 8 to an electrically disconnected state after the arc tube 6 is started. A thermal responsive switch 13 and a thermal responsive switch 14 which is closed at room temperature and is made of bimetal
It has a series circuit with a heating resistor 15 for limiting the current and opening the two thermally actuated switches 13, 14.

The two heat-responsive switches 13 and 14 are both arranged close to the heating resistor 15 by, for example, 3 mm to 10 mm.

The heating resistor 15 is composed of a tungsten filament coil wound around an alumina ceramic member.

One end of the starting auxiliary conductor 8 is provided with an intermediate point (point a in FIG. 3) between the thermal interrupting switch 14 for current interruption and the heating resistor 15, or the thermal interrupting switch 13 for interruption and the heating resistor 15. Is connected to the intermediate point (point b in FIG. 3) and the other end is open.

Next, as shown in FIG. 3, in the case where such a high-pressure sodium lamp 16 with a built-in starter is combined with a lighting circuit 18 equipped with a copper-iron type reactance ballast 17 for a high-pressure mercury lamp. The operation of the starting device 7 will be described.

When the AC power supply voltage 19 is applied to the high-pressure sodium lamp 16, the heat-interrupting switch 13 for shutting off or the heat-responsive switch for shutting off current 14 is opened by the resistor 15 for heating. By this opening operation, the current is cut off, and the copper-iron type reactance stabilizer 17 has 3 kV to 4 kV.
A high voltage pulse voltage of is induced. The induced high voltage pulse voltage and the effect of lowering the starting voltage by the starting auxiliary conductor 8 start the arc tube 6.

In general, the arc tube 6 is one of the thermal response switch 13 for shutting off or the thermal response switch 14 for shutting off current.
It starts by opening and closing three times.

Immediately after starting the arc tube 6, the opening / closing operation of each of the thermal response switches 13 and 14 is stopped, and the thermal response switches 13 and 14 are both closed. The temperature of each of the heat responsive switches 13 and 14 is raised by the heating by the heating resistor 15 during the opening / closing operation.

After 1 to 3 minutes from the start of the start-up, the heat-responsive switches 13 and 14 are opened due to the heat radiation from the arc tube 6. By this opening operation, the starting device 7 is released from the lighting circuit 18, and the starting auxiliary conductor 8 is electrically cut off. This state is maintained during steady lighting.

Next, the function and effect of the high-pressure sodium lamp (hereinafter referred to as "invention product A") with a built-in starter having a rated power of 360 W according to the first embodiment of the present invention was examined.

First, 100 products A of the present invention were produced, and each produced lamp was lit in combination with a lighting circuit 18 equipped with a copper-iron type reactance stabilizer 17 for a high pressure mercury lamp, and a life test was conducted. . Then, the presence or absence of change in emission color after 16000 hours of lighting and the presence or absence of extinguishing due to increase in lamp voltage were examined.

Further, instead of the starting device 7, a high-voltage built-in starting device having a rated power of 360 W and having the same structure as the product A of the present invention except that the conventional starting device shown in FIG. 5 is used. A sodium lamp (hereinafter referred to as “conventional product A”) was also subjected to a life test under the same conditions as the product A of the present invention,
Similarly, whether there is a change in the emission color after 16000 hours of lighting,
Also, it was examined whether or not the extinction occurred due to the rise of the lamp voltage.

The life test was carried out for 2.5 hours with 0.
This was repeated with one cycle of turning off the light for 5 hours.

As a result, all the product A of the present invention exceeded the rated life time of 12,000 hours, ie, 16,000.
It was found that the sodium disappearance phenomenon was not observed even after the passage of time, and the extinction due to the change of the emission color and the rise of the lamp voltage did not occur.

On the other hand, in the conventional product A, no sodium disappearance phenomenon was observed within the rated life time of 12000 hours, but after 16000 hours of lighting, 7 out of 100 pieces were At the outer surface of the arc tube 6 near the start auxiliary conductor 8 is attached, a peculiar black spot, which is a trace of sodium disappearance, is observed, the emission color changes from orange to pink, and the lamp voltage changes. The voltage increased by 20 V or more and disappeared. In fact, when the amount of sodium lost in the conventional product A was examined, it was 2 mg to 3 m more than the initial amount (22 mg) in which it was enclosed.
It was found that it had disappeared.

The reason why such a result is obtained is considered to be as follows.

In the product A of the present invention, since the heating resistor 15 is arranged in the vicinity of the thermal interrupting switch 13 for shifting the starting auxiliary conductor 8 to the electrically disconnected state, the arc tube is provided. After starting the start of 6, the thermal response switch for shutting off 1
3 is quickly heated by the heating resistor 15, and the opening time of the thermal response switch 13 is shortened to 1 to 3 minutes, so that the starting auxiliary conductor 8 can be quickly switched to the electrically disconnected state. It is considered to be due to

On the other hand, in the conventional product A, the opening time of the heat-responsive switch for shutting off after the start of the arc tube 6 is as long as 5 minutes to 7 minutes, and during this period, a specific potential is applied to the starting auxiliary conductor 8. Therefore, it is considered that sodium disappeared.

As described above, according to the structure of the high-pressure sodium lamp according to the first embodiment of the present invention, the heating resistor 15 shuts off the starting auxiliary conductor 8 to the electrically shut-off state. Since the heat-responsive switch 13 is arranged close to the heat-responsive switch 13, the shut-off heat-responsive switch 13 is quickly heated by the heating resistor 15 after the start of the arc tube 6 and the opening time of the heat-responsive switch 13 is 1 minute. It is as fast as ~ 3 minutes, so that the starting auxiliary conductor 8 can be quickly moved to the electrically disconnected state. As a result, particularly in a high-pressure sodium lamp having a long life of more than 12,000 hours, it is possible to suppress the disappearance of sodium enclosed in the arc tube 6 even after the lighting elapsed time exceeding the life of the lamp. It is possible to prevent a change in the color of light emitted from the lamp due to the disappearance of the lamp and the occurrence of extinguishing due to an increase in the lamp voltage.

It should be noted that one end of the starting auxiliary conductor 8 is connected to an intermediate point between the current interrupting thermal responsive switch 14 and the heating resistor 15, or an intermediate point between the thermal interrupting switch 13 and the heating resistor 15. Therefore, the thermal response switch for shutting off 1
Since 3 also serves as a double opening / closing switch function of the starting device 7, the restarting time of the thermal interrupting switch 13 is set earlier than the recovering time of the thermal interrupting current switch 14 when restarting. do not have to.

Next, the second embodiment of the present invention is a high-pressure sodium lamp having a rated power of 360 W and having a built-in starter, except that the structure of the starter 20 is different, as shown in FIG. It has the same configuration as the high-pressure sodium lamp with a built-in starter of rated power 360 W according to the first embodiment of the present invention.

The starting device 20 is closed at room temperature and is made of a bimetal. The starting device opening thermal response switch 21 is made of a tungsten filament, and the current limiting resistor 2 is made of tungsten filament.
2. Non-linear ceramic capacitor element for current interruption 2
3 (NCC element), a temperature-closed thermoresponsive switch 24 made of bimetal that is closed at room temperature and also has a pulse stopping function, and a voltage detection switching element 25 that is a bidirectional semiconductor switching element connected in series. A heating resistor 26 that is connected in parallel to a series circuit of the NCC element 23, the thermal blocking switch 24 for shutting down, and the voltage-sensing switching element 25, and that is arranged close to the thermal responsive switch for shutting off 24. Thermally activated switch 2 for shutting off
4 and a voltage detection type switching element 25, and a resistor 27 connected in parallel to a series circuit.

In the starting device 20, the connection positions of the thermal shutoff switch 24 and the voltage detection type switching element 25 may be exchanged.

The pulse stopping function of the shut-off thermally responsive switch 24 is a function of quickly opening the thermally responsive switch 24 by the heating resistor 26 to stop the pulse oscillation when the lamp is turned off. Is.

The resistor 27 is for stabilizing the oscillation phase of the high voltage pulse voltage and for preventing the NCC element 23 from being deteriorated by the pyroelectric current.

When the xenon in the arc tube 6 leaks into the outer tube 2, the tungsten electrode 28 causes arc discharge with the current limiting resistor 22 to disconnect the current limiting resistor 22. Has a function of stopping the pulse oscillation operation.

One end of the starting auxiliary conductor 8 is connected to an intermediate point (point c in FIG. 4) between the thermal break switch 24 and the voltage detection type switching element 25.

Next, the operation of the starting device 20 when such a high-pressure sodium lamp 29 with a built-in starting device is combined with a lighting circuit 18 equipped with a copper-iron type reactance ballast 17 for a high-pressure mercury lamp. explain.

When the AC power supply voltage 19 is applied to the high voltage sodium lamp 29, a high voltage pulse voltage of about 2 kV is induced in the reactance ballast 17 every half cycle by the current switching operation of the NCC element 23. The induced high voltage pulse voltage and the effect of lowering the starting voltage by the starting auxiliary conductor 8 start the arc tube 6.

Immediately after starting the arc tube 6, the NCC element 23
The voltage applied to the NCC element 23 decreases, the current switching operation of the NCC element 23 is disabled, and the high-voltage pulse voltage oscillation is stopped.

The cutoff thermal responsive switch 24 continues to be heated by the heating resistor 26 until the starter opening thermal responsive switch 21 is in the open state, and is further heated by the heat radiation from the arc tube 6 to start the startup. After 1 to 3 minutes, it becomes open. By this opening operation, the starting auxiliary conductor 8 shifts to a state where it is electrically cut off. At this time, the voltage detection type switching element 25 functions as an insulating element that releases the auxiliary starting conductor 8 from the lighting circuit.

After the arc tube 6 is started, the heat-actuating switch 21 for opening the starting device is opened by the heat radiation from the arc tube 6, and the starting device 20 is opened from the lighting circuit 18. This state is maintained during steady lighting.

The thermal response switch 21 for opening the starting device
Although the opening time of 2 is set to 2 to 3 minutes in the present embodiment, it is not necessary to set it to a specific range.

Further, when the arc tube 6 is restarted, the return time of the thermal response switch 21 for opening the starting device is set longer than the return time of the thermal response switch 24 for shutting off. This is because if the recovery time of the starting device opening thermal responsive switch 21 is shorter than the recovery time of the shutoff thermal responsive switch 24, a current will flow through the heating resistor 26, and the thermal responsive switch 24 will not be able to return due to the heat dissipation. This is because there are cases.

Next, the function and effect of the high-pressure sodium lamp (hereinafter referred to as "invention product B") with a built-in starter having a rated power of 360 W according to the second embodiment of the present invention was examined.

First, 100 products B of the present invention were produced, and each produced lamp was combined with a lighting circuit 18 equipped with a copper-iron type reactance stabilizer 17 for a high-pressure mercury lamp, and the lamp was lit for a life test. . Then, the presence or absence of change in emission color after 16000 hours of lighting and the presence or absence of extinguishing due to increase in lamp voltage were examined.

Further, instead of the starting device 20, a high-voltage built-in starting device having a rated power of 360 W and having the same structure as the product B of the present invention except that the conventional starting device shown in FIG. 6 is used. Sodium lamp (hereinafter referred to as "conventional product B")
For the same, a life test was performed under the same conditions as the product B of the present invention, and the presence or absence of a change in the emission color after the lapse of lighting for 16000 hours and the occurrence of extinguishing due to an increase in the lamp voltage were examined.

As a result, in the case of the present invention products B, the sodium disappearance phenomenon was not observed even after the lighting of 16000 hours, which exceeded the rated life time of 12000 hours, and due to the change of the emission color and the increase of the lamp voltage. It turns out that there is no disappearance.

On the other hand, in the conventional product B, no sodium disappearance phenomenon was observed within 12,000 hours, which is the rated life time, but after 16000 hours of lighting, 10 of 100 were At the outer surface of the arc tube 6 near the start auxiliary conductor 8 is attached, a peculiar black spot which is a trace of sodium disappearance is observed, and the emission color changes from orange to pink.
Further, the lamp voltage increased by 20 V or more and the lamp was extinguished. Actually, when the amount of sodium lost in the conventional product B was examined, it was 2 mg more than the initial amount (22 mg) that was enclosed.
It was found that ~ 3 mg had disappeared.

The reason why such a result is obtained is considered to be as follows.

In the product B of the present invention, a thermal shut-off switch 24 for shifting the starting auxiliary conductor 8 to an electrically shut-off state, and a heating thermal switch placed in the vicinity of the thermal shut-off switch 24 for shutting off. The resistor 26 is provided, and further, after the start of the arc tube 6 is started, the cutoff thermal responsive switch 24 is heated by the heating resistor 26, and the heat radiation from the arc tube 6 is also added for 1 to 3 minutes. It is considered that this is because the starting auxiliary conductor 8 was able to be rapidly switched to the electrically disconnected state because it was quickly opened.

On the other hand, in the conventional product B, since one end of the starting auxiliary conductor 8 is connected to the starting device via the small-capacity capacitor, the starting auxiliary conductor 8 is included even during steady lighting.
Was not completely electrically blocked, and it is thought that sodium disappeared.

As described above, according to the structure of the high-pressure sodium lamp according to the second embodiment of the present invention, the starting auxiliary conductor 8 is moved to the substantially same state as when it was electrically cut off as in the conventional case. It is not necessary to use the small-capacity capacitor provided in the above, and instead, the thermal shutoff switch 24 for shifting the starting auxiliary conductor 8 to the electrically shutoff state and the thermal shutoff switch 24 for proximity And the heating resistor 26 arranged in the same manner. Further, after the starting of the arc tube 6, the shut-off thermal responsive switch 24 is heated by the heating resistor 26, and the heat radiation of the arc tube 6 is also added. Since it is opened as quickly as 3 minutes to 3 minutes, the starting auxiliary conductor 8 can be quickly moved to the electrically disconnected state. As a result, particularly in a high-pressure sodium lamp having a long life of more than 12,000 hours, it is possible to suppress the disappearance of sodium enclosed in the arc tube 6 even after the lighting elapsed time exceeding the life of the lamp. It is possible to prevent a change in the color of light emitted from the lamp due to the disappearance of the lamp and the occurrence of extinguishing due to an increase in the lamp voltage. Further, in the starting device 20, the small-capacity capacitor used in the conventional starting device is no longer necessary, and the resistor 27 is connected in parallel to the pulse-stopping thermal response switch used in the conventional starting device. Since it has the functions of both the bypass resistor and the control resistor connected in parallel to the voltage detection type switching element, it is possible to reduce the number of parts, thus simplifying the circuit configuration and reducing the number of components. Cost can be reduced.

In the second embodiment described above, the semiconductor switching element is used as the voltage detection type switching element.
Even when an element that performs a switching operation by detecting a voltage such as a gap is used, the same effect as above can be obtained.

In the first and second embodiments, the high-pressure sodium having a rated power of 360 W and a built-in starter is described. However, in addition to the rated power of 360 W, for example, rated power of 110 W, 180 W, 220 W, 270 W, 6 W.
It can also be applied to 60 W and 940 W high-pressure sodium lamps.

In the first and second embodiments, the high-pressure discharge lamp has been described as an example of the high-pressure discharge lamp. However, in the present invention, the envelope in which sodium is enclosed is made of ceramic and emits light. It can also be applied to a metal halide lamp having a tube.

[0074]

As described above, according to the present invention, in a high pressure discharge lamp having a particularly long lamp life, it is possible to suppress the disappearance of sodium enclosed in the arc tube, change the luminescent color of the lamp and the lamp voltage. It is possible to provide a high-pressure discharge lamp that can prevent the extinction due to the rise of the lamp.

[Brief description of drawings]

FIG. 1 is a front view of a high-pressure sodium lamp with a built-in starter according to a first embodiment of the present invention.

FIG. 2 is a front sectional view of an arc tube which is also used in a high pressure sodium lamp with a built-in starter.

FIG. 3 is a circuit diagram of a high-pressure sodium lamp also having a built-in starter.

FIG. 4 is a circuit diagram of a high-pressure sodium lamp with a built-in starter according to a second embodiment of the present invention.

FIG. 5 is a circuit diagram of a conventional high-pressure sodium lamp with a built-in starter.

FIG. 6 is a circuit diagram of another conventional high-pressure sodium lamp with a built-in starter.

[Explanation of symbols]

1 stem 2 outer tube 3 base 4,5 stem wire 6 arc tube 7,20 Starter 8 Starting auxiliary conductor 9 envelope 10 electrodes 11 niobium tube 12 Ceramic cement 13,24 Thermally activated switch for shutting off 14 Thermally activated switch for breaking current 15,26 Heating resistor 16,29 High pressure sodium lamp 17 Copper Iron Reactance Ballast 18 lighting circuit 19 AC power supply voltage 21 Thermal response switch for opening the starter 22 Current limiting resistor 23 Non-linear ceramic capacitor element 25 Voltage detection type switching element 27 resistor 28 Tungsten electrode

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Tomonari Uemura             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F term (reference) 3K083 AA45 AA47 AA66 BA12 BC04                       BC16 BC34 BC42 BD03 BD09                       BD15 CA06 CA37 EA02                 5C039 BA07 BA08 BB03 BB05 BB08                       BB13

Claims (4)

[Claims] 1. An arc tube having electrodes at both ends, a starting device connected in parallel with the arc tube, and a starting auxiliary conductor attached to an outer surface of the arc tube, the starting device comprising:
A thermal responsive switch for shutting off the starting auxiliary conductor after the start of the arc tube, and a thermal responsive switch for shutting down, which is provided close to the thermal responsive switch for shutting off. A high pressure discharge lamp having a heating resistor for opening a switch. 2. The starting device includes a series circuit of the thermal responsive switch for breaking, a thermal responsive switch for interrupting current, and the heating resistor for opening each of the thermal responsive switches, 2. The high pressure discharge lamp according to claim 1, wherein one end of the starting auxiliary conductor is connected between the cutoff thermal responsive switch and the current cutoff thermal responsive switch. 3. The starting device is configured such that a nonlinear ceramic capacitor element and a series circuit of the thermal response switch for interruption and the voltage detection type switching element having a pulse stopping function are connected in series, and the heating resistor is also connected. The body is connected in parallel to a series circuit of a non-linear ceramic capacitor element, the cutoff thermal response switch and the voltage detection type switching element, and one end of the starting auxiliary conductor has the cutoff thermal response switch and the voltage detection type switching element. The high pressure discharge lamp according to claim 1, wherein the high pressure discharge lamp is connected between 4. The starting device includes a resistor connected in parallel to a series circuit of the shut-off thermally responsive switch and the voltage detection type switching element. High pressure discharge lamp.