JP2008152972A - Light-emitting device and light-emitting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light-emitting device designed to be miniaturized, while satisfying the withstand voltage, and to provide a light emission method. <P>SOLUTION: A plasma generating electrode 11 is disposed at a very close distance from the anode 3 of a glass bulb 2, filled with xenon (Xe) gas 1 through a high resistance 12 and a switch SW transistor 13 so as to be able to supply a voltage equivalent to the potential of a cathode 4 that forms an opposite electrode. If a switching-on signal SW is supplied to the base of a switching (SW) transistor 13, the voltage equivalent to the potential of the cathode 4 is supplied to the plasma generating electrode 11 via the high resistance 12. The concentration of xenon gas ionized is enhanced, in advance, to a certain degree, by starting plasma discharge forming auxiliary discharge using the plasma generating electrode 11 between different electrodes several seconds, before the start of stroboscopic emission, and after that, stroboscopic emission by a low trigger voltage can be made possible. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a light emitting device and a light emitting method for lighting a discharge lamp such as a xenon (Xe) lamp.

  Conventionally, noble gases have been employed in strobes (flash light emitting devices). The reason for this is that when the gas itself is ionized, charges pass through the air, and when this charge recombines with electrons, the amount of emitted light is the largest.

  In many cases, xenon gas is used as the rare gas. This is because, among rare gases, it is easy to ionize next to radon gas, and the light spectrum when emitting light is closest to sunlight.

  A high voltage of 200 V to 300 V is applied between the anode and cathode of the xenon tube filled with the xenon gas. A trigger electrode is arranged between the anode and the cathode, and a high voltage of several KV is applied to the trigger electrode.

At this time, the xenon gas is ionized, and the internal impedance rapidly decreases. For this reason, light emission by the xenon gas is realized by conducting an ionic current between the anode and the cathode of the xenon tube.
For example, a light-emitting circuit for turning on a flash with a camera strobe has been proposed as an example of applying the light emission by the xenon gas described above (Non-Patent Document 1).

FIG. 7 shows a circuit diagram of a general light emitting circuit of a camera strobe.
In FIG. 7, the voltage (DC 10 V or less) supplied from the battery of the digital still camera (DSC) is boosted by the step-up transformer 32 and then rectified by the rectifier diode 33 to become a high voltage (DC 300 to 350 V). Due to this high voltage, the electrolytic capacitor 34 and the trigger capacitor 35 are charged, and the charging voltage of the electrolytic capacitor 34 and the trigger capacitor 35 reaches the high voltage (DC 300 to 350 V) and enters a standby state.

  The electric charge after rectification by the rectifier diode 33 is once stored in a medium-high voltage capacitor 40 for noise reduction, and then stored in a large-capacity electrolytic capacitor 34. The electric charge after rectification by the rectifier diode 33 is stored in the trigger capacitor 34 after being subjected to a predetermined voltage drop by the resistor 42. The diode 41 is used to prevent charge backflow.

Here, when the strobe light emission switch signal 38 is input to the terminal of the thyristor 39, the charge charged in the trigger capacitor 35 is discharged. The charging voltage discharged from the trigger capacitor 35 is boosted by the trigger coil 36 and supplied to the trigger electrode. For this reason, the interelectrode potential difference of the xenon tube 37 by the trigger electrode is several kV (5 to 7 kV).
Note that a medium and high voltage capacitor 43 and a resistor 44 are used as a boost (double voltage) circuit by the trigger coil 36.

  As a result, the xenon gas inside the xenon tube 37 is ionized and the inside of the xenon tube 37 becomes conductive. As a result, a large amount of charge due to the high voltage (DC 300 to 350 V) charged in the electrolytic capacitor 34 flows into the xenon tube 37 via the diode 41, so that strobe light emission is performed by the xenon tube 37.

  In addition, a light emitting circuit has been proposed in which two large-capacity high-voltage capacitors are provided, pre-light emission is performed with a small-sized capacitor, and miniaturization is achieved by suppressing the voltage applied to the large-capacity high-voltage capacitor (Patent Document) 1). That is, this light emitting circuit performs initial discharge by a relatively small capacity pre-capacitor (first capacitor) when the xenon (Xe) lamp is caused to emit light, and after the initial discharge, Xe is generated by the main capacitor (second capacitor). The lamp is made to emit light.

  In addition, there has been proposed a flash device in which a reflector is formed of a conductive material and is placed in close contact with or close to a xenon arc tube, and voltage is applied to the reflector to ionize xenon gas in the glass tube (Patent Document 2). reference).

  That is, the flash device includes a xenon arc tube in which xenon gas is sealed in a glass tube not covered with a nesa film, and a reflector that irradiates light emitted from the xenon arc tube toward a subject. is there. Then, the reflector is formed of a conductive material and is placed in close contact with or close to the xenon arc tube, and a voltage is applied to the reflector to ionize the xenon gas in the glass tube.

Murata “Ceramic Capacitor for Strobe Circuit Trigger”, [online], March 28, 2006, [Search December 7, 2006], Internet <URL: http://www.murata.co.jp/ articles / ta04c1.html> JP 2005-302380 A JP 2006-58686 A

  However, it is generally said that the withstand voltage of air is 1 mm / 1 KV. For this reason, in the technique described in Non-Patent Document 1 and the techniques described in Patent Documents 1 and 2, the circuit including the trigger coil and its booster circuit and the other circuit are separated from each other by an interval that satisfies the withstand voltage. There is a need.

  In other words, if the trigger voltage is 5 KV, a leak current may flow between the trigger coil and the circuit including the booster circuit and other circuits if they are not separated from each other by 5 mm or more. For this reason, there is an inconvenience of losing the charge accumulated in order to emit light at an unexpected time, thereby losing the opportunity for light emission photographing in the important photographing scene.

For this reason, if a spatial distance necessary to satisfy the withstand voltage cannot be secured between the circuit including the trigger coil and its booster circuit and another circuit, a strong insulator is sandwiched between them. Has been devised.
However, this restriction has been a factor that hinders downsizing of portable electronic devices, digital still cameras, movie cameras, and the like that use strobes.

  Accordingly, an object of the present invention is to provide a light-emitting device and a light-emitting method that can satisfy the withstand voltage and can be reduced in size.

  In order to achieve the above object, according to the present invention, a light emitting device of the present invention includes a discharge lamp that is supplied with a discharge voltage between one and the other electrode and emits light by discharge between the one and the other electrode, and the above discharge lamp. One electrode is connected in series to the other electrode, and a switching means for supplying a trigger voltage to the trigger electrode of the discharge lamp, and a trigger voltage on the trigger electrode of the discharge lamp according to an ON operation of the switching means Is connected in parallel between the trigger coil for starting discharge of the discharge lamp, the one electrode of the discharge lamp and the other electrode of the switching means, and the one of the discharge lamp and A capacitor for supplying the discharge voltage between the other electrodes and the one or the other electrode of the discharge lamp; It is obtained by an auxiliary electrode for initial discharge of the discharge lamp by supplying a voltage different from the voltage of the one or the other of the electrodes of the discharge lamp.

  In the light emitting device of the present invention, a discharge voltage is supplied between one electrode and the other electrode, and one electrode is provided on the other electrode of the discharge lamp. Switching means for supplying a trigger voltage to the trigger electrode of the discharge lamp connected in series, and supplying the trigger voltage to the trigger electrode of the discharge lamp according to the ON operation of the switching means, A trigger coil for starting discharge, the one electrode of the discharge lamp, and the other electrode of the switching means are connected in parallel, and the discharge voltage is supplied between the one and the other electrodes of the discharge lamp. And a capacitor that is disposed away from the one or other electrode of the discharge lamp, and the one or other of the discharge lamp A first auxiliary electrode for performing an initial discharge of the discharge lamp by supplying a voltage different from the voltage of the first electrode; and the vicinity of the first auxiliary electrode apart from the other or one electrode of the discharge lamp And a second auxiliary electrode for performing initial discharge of the discharge lamp by supplying a voltage different from the voltage of the other or one of the electrodes of the discharge lamp.

  The light emitting method of the present invention comprises a step of charging a capacitor with the discharge voltage to supply a discharge voltage between one and the other electrodes of a discharge lamp that emits light by discharge between the one and the other electrodes, Performing an initial discharge of the discharge lamp by supplying a voltage having substantially the same potential as the other or one electrode of the discharge lamp to an auxiliary electrode disposed in the vicinity of the one or other electrode of the discharge lamp. And a step of starting discharge of the discharge lamp by supplying a trigger voltage to the trigger electrode of the discharge lamp via a trigger coil in response to an ON operation of the switching means.

  The light emitting method of the present invention comprises a step of charging a capacitor with the discharge voltage to supply a discharge voltage between one and the other electrodes of a discharge lamp that emits light by discharge between the one and the other electrodes, The first auxiliary electrode disposed away from the one or other electrode of the discharge lamp is supplied with a voltage having substantially the same potential as the other or one electrode of the discharge lamp, and the other or By supplying a voltage having substantially the same potential as that of the one or the other electrode of the discharge lamp to a second auxiliary electrode that is disposed in the vicinity of the first auxiliary electrode apart from the one electrode, the discharge lamp By supplying a trigger voltage to the trigger electrode of the discharge lamp via a trigger coil in accordance with the step of performing the initial discharge and the ON operation of the switching means. It is intended to include a step of starting the discharge of the electric lamp.

  As a result, plasma can be generated by the auxiliary electrode provided inside the xenon tube, which is a discharge lamp. For this reason, ionization of xenon gas can be promoted. Therefore, light emission of xenon gas can be realized with a low trigger voltage. Thereby, a small flash light emitting device (strobe unit) can be provided.

  Also, by realizing the emission of xenon gas with a low trigger voltage, it is possible to shorten the insulation distance between the high voltage circuit including the trigger coil and its booster circuit and another low voltage circuit.

  According to the present invention, since light emission of xenon gas can be realized with a low trigger voltage, a small flash light emitting device (strobe unit) can be provided. Thereby, it is possible to satisfy the withstand voltage between the high voltage circuit including the trigger coil of the light emitting device and its booster circuit and the other low voltage circuit, and to achieve downsizing.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 shows a configuration example of a flash light emission (strobe) device according to the present embodiment.
In FIG. 1, the input voltage is supplied between the primary side terminals of the step-up transformer 9, and the boosted voltage is output between the secondary side terminals of the step-up transformer 9. The voltage boosted by the step-up transformer 9 is rectified by the rectifier diode 10, and the voltage after rectification is charged in the high-voltage capacitor 6. As a result, the step-up transformer 9 boosts the input DC low voltage, and charges the large-capacity high-voltage capacitor 6 with sufficient light emission charge.

  A series circuit of a glass tube 2 filled with xenon (Xe) gas 1 and an IGBT (Insulated Gate Bipolar Transistors) transistor 8 is connected in parallel to the high voltage capacitor 6, and a resistor 15 and a capacitor are connected. Sixteen series circuits are connected in parallel. Here, the anode 3 of the glass tube 2 filled with the xenon (Xe) gas 1 and the positive side of the high-voltage capacitor 6 are connected.

Further, the cathode 4 of the glass tube 2 filled with the xenon (Xe) gas 1 and the collector of the IGBT transistor 8 are connected.
The anode 3 of the glass tube 2 enclosing the xenon (Xe) gas 1 is supplied with electric charges for causing the xenon gas to emit light from the high voltage capacitor 6, and the cathode 4 receives the electric charges, whereby a large current is supplied to the glass tube 2. To flow.

  Further, the emitter of the IGBT transistor 8 is connected to the negative side of the high voltage capacitor 6. Resistors 17 and 18 are connected to the gate of the IGBT transistor 8, and the gate of the IGBT transistor 8 is connected to the negative side of the high-voltage capacitor 6 via the resistor 18. The gate of the IGBT transistor 8 is configured to be supplied with a trigger signal TR via a resistor 17.

  Further, the trigger electrode 5 opposed to the tube wall of the glass tube 2 filled with the xenon (Xe) gas 1 is connected to the start end of the secondary coil of the trigger coil 7. The starting end of the primary coil of the trigger coil 7 is connected to a series connection point of a resistor 15 and a capacitor 16 for giving a starting pulse to the trigger coil 7. The end of the primary coil and the end of the secondary coil of the trigger coil 7 are connected, and this connection point is connected to the cathode 4 of the glass tube 2 filled with xenon (Xe) gas 1.

Here, it is possible to supply a voltage having the same potential as that of the cathode 4 which is the opposite electrode at a distance in the vicinity of the anode 3 of the glass tube 2 filled with the xenon (Xe) gas 1 (about 0.1 mm to 0.3 mm). A plasma generating electrode 11 is disposed via a high resistance 12 and a switch (SW) transistor 13. That is, the plasma generating electrode 11 is connected to one end of the high resistance 12, and the other end of the high resistance 12 is connected to the collector of the switch (SW) transistor 13. The high resistance 12 controls the ionization speed of the xenon gas and prevents the transistor 13 from being destroyed.

  Further, the emitter of the switch (SW) transistor 13 is connected to the cathode 4 of the glass tube 2 filled with the xenon (Xe) gas 1. The base of the switch (SW) transistor 13 is configured to be supplied with a switch-on signal SW for enabling the plasma generating electrode 11 to be supplied with a voltage having the same potential as the cathode 4.

  The light emitting device for strobe flash using the glass tube 2 filled with the xenon (Xe) gas 1 charges the high voltage capacitor 6 through a voltage of 200 V to 300 V generated at the secondary side terminal of the step-up transformer 9. Then, the energy of the voltage charged in the high voltage capacitor 6 is supplied to the primary coil of the trigger coil 7 through the resistor 15 and the capacitor 16.

  At the same time, a trigger signal TR is input to the gate of the IGBT transistor 8 to induce a starting pulse in the secondary coil of the trigger coil 7. In this way, the IGBT transistor 8 generates a high voltage of several KV in the trigger coil 7 by controlling the current flowing through the gate.

  Due to the action of the trigger coil 7, a high voltage of several Kv is supplied to the trigger electrode 5 disposed opposite to the wall surface of the glass tube 2 filled with the xenon (Xe) gas 1. Thereby, this high voltage is applied to the trigger electrode 5 in order to ionize the xenon (Xe) gas 1. At this time, by applying the charging voltage of the high voltage capacitor 6 to the anode 3 and the cathode 4 of the glass tube 2 filled with the xenon (Xe) gas 1, the xenon (Xe) gas 1 filled in the glass tube 2 is discharged. To start.

  At this time, the minimum voltage that can be discharged is 240 V or more in the case of a short arc Xe lamp having an arc length of 12 mm and a gas pressure of 2 atm. If this voltage is too low, the strobe may not emit light, so the applied voltage of the Xe lamp usually requires about 300V. Further, a thyristor may be used instead of the IGBT transistor 8 as the switching means.

  At this time, the glass tube 2 is filled with xenon gas which has the lowest ionization energy next to radon gas and is easily ionized among rare gases. In addition, the cathode 4 or anode 3 (FIG. 1) of the opposite electrode is located at a distance (approximately 0.1 mm to 0.3 mm) in the vicinity of either the anode 3 or the cathode 4 (the anode 3 in FIG. 1) of the glass tube 2. Then, a plasma generating electrode 11 having the same potential as that of the cathode 4) is arranged through a high resistance 12.

Therefore, when a switch-on signal SW is supplied to the base of the switch (SW) transistor 13, a voltage having the same potential as that of the cathode 4 is supplied to the plasma generating electrode 11 through the high resistance 12.
As a result, plasma discharge as auxiliary discharge is started between the different polarities of 0.1 mm to 0.3 mm using the plasma generating electrode 11 from several seconds before the strobe light emission described above is started. As a result, the concentration of the previously ionized xenon gas can be increased to some extent, and thereafter, strobe light emission with a low trigger voltage can be performed.

Therefore, as in the conventional strobe arc tube, first, a large amount of charge is stored in the high-voltage capacitor 6. Next, the switch (SW) transistor 13 is turned on by supplying a switch-on signal SW to the base of the switch (SW) transistor 13. Then, a voltage having the same potential as that of the cathode 4 is supplied to the plasma generating electrode 11 through the high resistance 12.
As a result, plasma discharge that becomes auxiliary discharge is started between the different polarities of 0.1 mm to 0.3 mm using the plasma generating electrode 11 from several seconds before the strobe light emission starts.

  Here, the trigger signal TR is input to the gate of the IGBT transistor 8. Due to the action of the trigger coil 7, for example, a voltage lower than the conventional voltage of 3 Kv is supplied to the trigger electrode 5. At this time, the charging voltage of the high-voltage capacitor 6 is applied to the anode 3 and the cathode 4 of the glass tube 2 filled with the xenon (Xe) gas 1 to fill the glass tube 2 that has already started plasma discharge. The xenon (Xe) gas 1 easily starts to discharge.

FIG. 2 is a diagram illustrating a configuration example of the plasma generating electrode. In FIG. 2, for convenience, all the electrodes are provided in the glass tube 2.
As shown in FIG. 2, as a novel configuration of the present embodiment, the xenon is disposed at a distance very close to the anode 3 of the glass tube 2 filled with the xenon (Xe) gas 1 (about 0.1 mm to 0.3 mm). (Xe) A plasma generating electrode 11 for promoting ionization of the gas 1 is provided.

  Further, a high resistance 12 is provided to prevent a main current due to a large amount of charge accumulated in the high voltage capacitor 6 of FIG. Further, a SW transistor 13 is added as a switch for starting to apply the same voltage to the plasma generating electrode 11 as the cathode 4 which is the opposite electrode.

FIG. 3 is a diagram showing a configuration example of another plasma generating electrode. Also in FIG. 3, it has shown so that all the electrodes may be provided in the glass tube 2 for convenience.
In FIG. 3, the plasma generating electrode 11-1 has a xenon (Xe) gas 1 at a distance very close (about 0.1 mm to 0.3 mm) of the cathode 4 of the glass tube 2 filled with the xenon (Xe) gas 1. It is provided to promote ionization.

  Further, a high resistance 12-1 is provided in order to prevent a main current due to a large amount of charge accumulated in the high voltage capacitor 6 of FIG. 1 from flowing into the plasma generating electrode 11-1. Further, a SW transistor 13-1 is added as a switch for starting to apply the same voltage as that of the anode 3 as the opposite electrode to the plasma generating electrode 11-1.

FIG. 4 is a diagram showing how plasma is generated.
As shown in FIG. 4, as the operation and action of plasma generation, first, as described above, a voltage of 200 V to 300 V is applied between the anode 3 and the cathode 4 to cause the xenon (Xe) gas 1 to emit light. Charge is accumulated in the high-voltage capacitor 6.

  Next, the SW transistor 13 is turned on to instruct the plasma generation on 20 to ionize the xenon (Xe) gas 1 little by little. At this time, xenon (Xe) gas 1 is gradually ionized by starting plasma discharge between plasma generating electrode 11 and anode 3 (or cathode 4 as shown in FIG. 3) to generate plasma 21.

FIG. 5 is a diagram illustrating how the trigger voltage is applied.
As shown in FIG. 5, when ionization of the xenon (Xe) gas 1 proceeds to some extent in the state shown in FIG. 4, a high trigger voltage application 22 is applied to the trigger electrode 5 via the trigger coil 7. Thereby, xenon (Xe) gas 1 is ionized, and xenon gas emission 23 is performed between the anode 3 and the cathode 4.

According to the present embodiment, by the action of the auxiliary discharge of the plasma generating electrode 11, it is possible to bring the xenon (Xe) gas 1 into a state where several percent of ion gas is mixed. Thereby, for example, it is possible to reduce the trigger voltage, which conventionally required about 5 KV, to about 3 KV, for example.
Not limited to the above-described embodiment, the plasma generating electrode may be configured as follows.

FIG. 6 is a diagram illustrating a configuration example of another plasma generation electrode. 6 also shows that all the electrodes are provided in the glass tube 2 for convenience.
As shown in FIG. 6, it is advantageous in terms of reducing the number of parts that the plasma generating electrode 11 for ionizing the xenon (Xe) gas 1 is arranged near the anode 3 or the cathode 4 as described above.

  However, the anode 3 is connected to the plasma generating anode 24 via the high resistance 12-1 and the SW transistor 13-1 even if they are somewhat apart from the respective electrodes of the anode 3 and the cathode 4. Further, the cathode 4 is connected to the plasma generating cathode 25 through the high resistance 12 and the SW transistor 13. At this time, if the distance between the plasma generating anode 24 and the plasma generating cathode 25 is about 0.1 mm to 0.3 mm, the same effect as described above can be obtained.

However, if the distance between the plasma generating anode 24 and the plasma generating cathode 25 and the trigger electrode 5 is not sufficient, a mis-discharge may occur before the main discharge and the light emission may fail.
Further, as described above, when the plasma generating electrode 11 is disposed in the vicinity of the anode 3 and the cathode 4, as shown in FIGS. 2 and 3, the respective ends outside the range between the anode 3 and the cathode 4 are excluded. It is desirable to arrange on the side (back side).

  For example, a mixed rare gas such as neon, argon, and xenon is used in a plasma display, and a voltage required for ionization between electrodes of 0.1 mm to 0.3 mm is said to be several hundreds of volts. Therefore, plasma can be emitted with a voltage of 200 to 300 V stored in the high-voltage capacitor 6, and it is not necessary to have a special voltage generation circuit.

As described above, the trigger voltage can be set to a low voltage of 3 KV, for example, so that the following effects can be considered.
First, the insulation distance between the anode 3 and the trigger electrode 5 or between the cathode 4 and the trigger electrode 5 can be arranged small. This distance has conventionally required 1 mm for an applied voltage of 1 KV. For example, an insulation distance of 5 mm for an applied voltage of 5 KV is required, whereas an insulating distance of 3 mm for an applied voltage of 3 KV is sufficient. .

Moreover, the space | interval of the wiring pattern of the circuit connected between the anode 3 and the trigger electrode 5 or between the cathode 4 and the trigger electrode 5 can be made small. Furthermore, the distance between the secondary side of the trigger coil 7 and the other low voltage circuits on the primary side can be reduced.
Thereby, a more compact strobe unit can be provided.

  Needless to say, the present invention is not limited to the above-described embodiment, and can be appropriately changed without departing from the gist of the present invention.

It is a figure which shows the structural example of the flash light-emitting device by one embodiment of this invention. It is a figure which shows the structural example of a plasma generation electrode. It is a figure which shows the structural example of another plasma generation electrode. It is a figure which shows the mode of plasma generation. It is a figure which shows the mode of a trigger voltage application. It is a figure which shows the structural example of another plasma generation electrode. It is a figure which shows the circuit example of the light emission circuit of the conventional camera strobe.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Xenon (Xe) gas, 2 ... Glass tube, 3 ... Anode, 4 ... Cathode, 5 ... Trigger electrode, 6 ... High voltage capacitor, 7 ... Trigger coil, 8 ... IGBT transistor, 9 ... Boost transformer, 10 ... Rectifier diode 11 ... Plasma generating electrode, 12 ... High resistance, 13 ... SW transistor, 24 ... Plasma generating anode, 25 ... Plasma generating cathode

Claims (6)

A discharge lamp that is supplied with a discharge voltage between one and the other electrode and emits light by a discharge between the one and the other electrode;
One electrode is connected in series to the other electrode of the discharge lamp, and switching means for supplying a trigger voltage to the trigger electrode of the discharge lamp;
A trigger coil for starting the discharge of the discharge lamp by supplying a trigger voltage to the trigger electrode of the discharge lamp in response to an ON operation of the switching means;
A capacitor connected in parallel between the one electrode of the discharge lamp and the other electrode of the switching means, and supplying the discharge voltage between the one and other electrodes of the discharge lamp;
An auxiliary electrode disposed in the vicinity of the one or other electrode of the discharge lamp, for performing an initial discharge of the discharge lamp by supplying a voltage different from the voltage of the one or other electrode of the discharge lamp;
A light-emitting device comprising: The light-emitting device according to claim 1.
Light emission characterized by comprising auxiliary switching means for connecting between the auxiliary electrode at one end and the other or one electrode of the discharge lamp at the other end when performing the initial discharge of the discharge lamp. apparatus. A discharge lamp that is supplied with a discharge voltage between one and the other electrode and emits light by a discharge between the one and the other electrode;
One electrode is connected in series to the other electrode of the discharge lamp, and switching means for supplying a trigger voltage to the trigger electrode of the discharge lamp;
A trigger coil for starting the discharge of the discharge lamp by supplying a trigger voltage to the trigger electrode of the discharge lamp in response to an ON operation of the switching means;
A capacitor connected in parallel between the one electrode of the discharge lamp and the other electrode of the switching means, and supplying the discharge voltage between the one and other electrodes of the discharge lamp;
A first auxiliary for disposing an initial discharge of the discharge lamp by supplying a voltage that is spaced apart from the one or other electrode of the discharge lamp and that is different from the voltage of the one or other electrode of the discharge lamp. Electrodes,
It is arranged in the vicinity of the first auxiliary electrode apart from the other or one electrode of the discharge lamp, and by supplying a voltage different from the voltage of the other or one electrode of the discharge lamp, A second auxiliary electrode for discharging,
A light-emitting device comprising: The light-emitting device according to claim 3.
When performing the initial discharge of the discharge lamp,
First auxiliary switching means for connecting between the first auxiliary electrode at one end and the other or one electrode of the discharge lamp at the other end;
And a second auxiliary switching means for connecting between the second auxiliary electrode at one end and the one or other electrode of the discharge lamp at the other end. Charging a capacitor with the discharge voltage to supply a discharge voltage between one and other electrodes of a discharge lamp that emits light by discharge between the one and the other electrodes;
An initial discharge of the discharge lamp is performed by supplying a voltage having substantially the same potential as that of the other or one electrode of the discharge lamp to an auxiliary electrode disposed in the vicinity of the one or other electrode of the discharge lamp. Steps,
In response to an ON operation of the switching means, starting a discharge of the discharge lamp by supplying a trigger voltage to the trigger electrode of the discharge lamp via a trigger coil;
A light emitting method comprising: Charging a capacitor with the discharge voltage to supply a discharge voltage between one and other electrodes of a discharge lamp that emits light by discharge between the one and the other electrodes;
The first auxiliary electrode disposed away from the one or other electrode of the discharge lamp is supplied with a voltage having substantially the same potential as the other or one electrode of the discharge lamp, and the other of the discharge lamp Alternatively, by supplying a voltage having substantially the same potential as that of the one or other electrode of the discharge lamp to a second auxiliary electrode disposed in the vicinity of the first auxiliary electrode apart from the one electrode, the discharge is performed. Performing an initial discharge of the lamp;
In response to an ON operation of the switching means, starting a discharge of the discharge lamp by supplying a trigger voltage to the trigger electrode of the discharge lamp via a trigger coil;
A light emitting method comprising:

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