JP3702309B2 - High pressure metal vapor discharge lamp - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a high pressure metal vapor discharge lamp having a built-in starter.
[0002]
[Prior art]
High-pressure metal vapor discharge lamps such as high-pressure sodium lamps in which sodium metal is sealed in a translucent ceramic tube and metal halide lamps in which metal halides are sealed in quartz arc tubes are widely used in the lighting field and other fields. ing. Various high-pressure metal vapor discharge lamps having a built-in starter have been proposed and used so that they can be used with an inexpensive mercury lamp ballast.
[0003]
FIG. 3 is a circuit diagram showing an example of a conventional high-pressure metal vapor discharge lamp with a built-in starter, wherein 1 is a light emitting tube, 2 is a resistor, 3 is a glow tube that opens and closes, and 4 is a normally closed bimetal switch. The resistor 2, the glow tube 3 and the bimetal switch 4 are connected in series with each other, and this series circuit is connected in parallel to the arc tube 1 to constitute a starting circuit.
[0004]
When such a high-pressure metal vapor discharge lamp with a built-in starter is connected to a power source via a ballast (such as a choke coil type ballast), a current flows through a series circuit consisting of a resistor 2, a glow tube 3, and a bimetal switch 4. The current is turned on and off by the opening and closing operation of the glow tube 3, and the lamp is started and lit by a pulse voltage induced in the ballast by this transient phenomenon. While the lamp is lit, the bimetal switch 4 is opened by the heat, and the starting circuit is disconnected, and the current to the glow tube is cut off.
[0005]
[Problems to be solved by the invention]
However, in such a high-pressure metal vapor discharge lamp with a built-in starter, if the start-up failure occurs due to wear of the electrode emitter of the arc tube during use of the lamp, it is built in the lamp as long as the power is applied to the lamp. The starter that has been operated continued to operate, and due to the high voltage pulse that was generated, there were problems such as (b) failure due to dielectric breakdown / degradation of the ballast and equipment wiring, shortening the service life, and (b) radio interference due to noise. .
[0006]
The present invention provides a high-pressure metal vapor discharge lamp that has solved such problems and has an excellent lifetime.
[0007]
[Means for Solving the Problems]
The high-pressure metal vapor discharge lamp of the present invention includes a first resistor ( 2 ) , a normally closed second bimetal switch ( 5 ) provided close to the first resistor ( 2 ) , a glow tube ( 3 ) and a normally closed first bimetal switch ( 4 ) connected in series to each other in parallel to the arc tube ( 1 ) , the second bimetal switch ( 5 ) is activated when the lamp fails to start. One of the glow tubes ( 3 ) is disconnected from the series circuit and connected to one of the second resistors ( 6 ) , whereby the first resistor ( 2 ) , the second bimetal switch ( 5 ) , the second The resistor ( 6 ) and the first bimetal switch ( 4 ) are connected in series with each other. Furthermore, a tungsten filament ( 7 ) is connected to this series circuit.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The high-pressure metal vapor discharge lamp according to the present invention additionally connects a normally-closed bimetal switch 5 provided close to the resistor 2, and when the bimetal switch 5 is operated, the glow tube 3 is disconnected and another additional resistor is added. 6 is connected so that the open / close operation of the glow tube does not last indefinitely even when the arc tube fails to start. Furthermore, by adding a tungsten filament, the enclosure leaks into the outer sphere, and even when it starts but does not reach stable lighting, the filament is blown off by discharge of the filament and the counter electrode to open and close the glow tube Stop operation. By doing in this way, the problem at the time of arc tube start-up failure or leakage of the arc tube enclosure can be effectively solved.
[0009]
【Example】
Hereinafter, the present invention will be described based on examples. FIG. 1 is a circuit diagram showing an embodiment of the high-pressure metal vapor discharge lamp according to the present invention, wherein 1 is an arc tube, 2 is a resistor, 3 is a glow tube that opens and closes, 4 is a normally closed bimetal switch, and 5 is a resistor. 2 is a normally closed bimetal switch provided in the vicinity of 2. The resistor 2, the bimetal switch 5, the glow tube 3, and the bimetal switch 4 are connected in series to each other, and this series circuit is connected in parallel to the arc tube 1 to constitute a starting circuit. Reference numeral 6 denotes a resistor. When the normally closed bimetal switch 5 is operated, one of the glow tubes is disconnected from the series circuit and connected to one of the resistors 6, whereby the resistor 2, the bimetal switch 5, the resistor 6, The bimetal switch 4 is configured to be connected in series with each other, and in this state, the glow tube is not opened or closed.
[0010]
When such a high-pressure metal vapor discharge lamp with a built-in starter is connected to a power source via a ballast (choke coil type ballast or the like), a series circuit comprising a resistor 2, a bimetal switch 5, a glow tube 3, and a bimetal switch 4 is formed. A current flows, and the current is turned on / off by opening / closing operation of the glow tube 3, and the lamp is started and lit by a pulse voltage induced in the ballast by this transient phenomenon. While the lamp is lit, the bimetal switch 4 is opened by the heat and the starting circuit is disconnected, and the current to the glow tube is cut off.
[0011]
In addition, when a potential is applied to the lamp from the ballast when the arc tube is in a poor starting state, the glow tube 3 continues to operate for a while, but the resistor 2 generates heat, and a bimetal switch provided in the vicinity thereof After 5 tens of seconds, the opening of the glow tube stops. Furthermore, the bimetal is opened by the residual heat of the resistor 2 and connected to the resistor 6. A current flows through the resistor 6 to generate heat, the connection between the bimetal switch 5 and the resistor 6 is maintained, the glow tube is disconnected from the circuit, and the glow tube does not operate thereafter. When the power is turned off, the circuit automatically returns to the original state.
[0012]
The resistor 6 is preferably a resistance of 3 kiloohms or more, preferably a carbon film resistance of 3 to 10 kiloohms, in order to reduce power consumption when the lamp is not lit.
[0013]
In general, lamp inconveniences and lifetime phenomena include arc tube leakage in addition to the rise in arc tube starting voltage as described above. In this case, the lamp starts but does not reach stable lighting. As a result, overcurrent continues to flow through the ballast.
[0014]
FIG. 2 is a circuit diagram showing another embodiment of the high-pressure metal vapor discharge lamp of the present invention, in which a tungsten filament 7 is further connected to the starting circuit in the embodiment of FIG. Reference numerals and functional operations other than the tungsten filament 7 are the same as those shown in FIG. In this embodiment, in the case of a high-pressure sodium lamp with a vacuum in the outer sphere, when the inclusion leaks into the outer sphere, it is easy to discharge the hot electrons from the high-temperature filament, and the filament 7 and the counter electrode The filament 7 is blown out by the discharge of, and the starting circuit is cut off. In addition, an emitter can be applied to the filament in order to facilitate discharge.
[0015]
【The invention's effect】
As described above, according to the present invention, the pulse generation is stopped after a predetermined time when the arc tube fails to start, and since it is an automatic return type, the lamp can be used continuously even when it is difficult to light up temporarily. Is possible. Furthermore, it has a function to prevent overcurrent to the ballast due to leakage of the arc tube enclosure, which is of great industrial value.
[Brief description of the drawings]
FIG. 1 is a circuit diagram showing an embodiment of the high-pressure metal vapor discharge lamp of the present invention. FIG. 2 is a circuit diagram showing another embodiment of the high-pressure metal vapor discharge lamp of the present invention. Circuit diagram showing an example of an electric lamp 【Explanation of symbols】
DESCRIPTION OF SYMBOLS 1 Light-emitting tube 2 1st resistance 3 Glow tube 4 1st bimetal switch 5 2nd bimetal switch 6 2nd resistance 7 Tungsten filament

Claims (2)

A first resistor ( 2 ) , a normally closed second bimetal switch ( 5 ) provided in the vicinity of the first resistor ( 2 ) , a glow tube ( 3 ) for opening and closing, and a normally closed first A series circuit in which bimetal switches ( 4 ) are connected in series with each other is connected in parallel with the arc tube ( 1 ) , and at the time of lamp start failure, the second bimetal switch ( 5 ) operates and one of the glow tubes ( 3 ) is connected in series. Disconnected from the circuit and connected to one of the second resistors ( 6 ) , the first resistor ( 2 ) , the second bimetal switch ( 5 ) , the second resistor ( 6 ) , the first bimetal A high-pressure metal vapor discharge lamp with a built-in starter, characterized in that the switches ( 4 ) are connected in series with each other. A first resistor ( 2 ) , a normally closed second bimetal switch ( 5 ) provided close to the first resistor ( 2 ) , a glow tube ( 3 ) for opening and closing operation, a normally closed first A series circuit in which a bimetal switch ( 4 ) and a tungsten filament ( 7 ) are connected in series is connected in parallel to the arc tube ( 1 ), and when the second bimetal switch ( 5 ) is operated, a glow tube ( 3 ) Is disconnected from the series circuit and connected to one of the second resistors ( 6 ) , the first resistor ( 2 ) , the second bimetal switch ( 5 ) , the second resistor ( 6 ) A high-pressure metal vapor discharge lamp having a built-in starter, wherein the first bimetal switch ( 4 ) and the tungsten filament ( 7 ) are connected in series.

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