JPH0527308A - Flashing device - Google Patents

Abstract

PURPOSE:To provide a flashing device capable of flashing from white light to orange light by means of one flashing tube. CONSTITUTION:This device is provided with a main capacitor 2 charged by receiving the output of a charge circuit 1, a sub capacitor 4 selectively charged to have high voltage necessary for starting flashing operation and low voltage which is lower than the high voltage by receiving the output of the capacitor 2, the flashing tube 6 which executes the flashing operation by the discharge of the charging charge of the sub capacitor 4, a trigger circuit 7 which triggers the flashing tube 6, a 1st control means 3 which lies in the charge circuit from the main capacitor 2 to the sub capacitor 4 and controls the charging operation, and a 2nd control means 5 which lies is the discharge circuit from the sub capacitor 4 to the flashing tube 6 and controls the discharging operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flash light emitting device, and more particularly to a flash light emitting device capable of performing white and orange flash light emission by controlling a light emitting operation voltage of a flash light emitting tube.

[0002]

2. Description of the Related Art Conventionally, when photographing a portrait or the like, it has been practiced to create a warm atmosphere by illuminating a person who is a subject with orange light such as a tungsten lamp or a candle.

By the way, since a light source having a low luminous intensity such as a tungsten lamp or a candle is used for the photographing as described above, the exposure is likely to be insufficient, and a highly sophisticated technique is required for the photographing. Therefore, it is hoped that a light emitting source for photographing that can emit light with a relatively high luminous intensity and has a wavelength close to that of the light source as described above will appear.

Further, in the case of performing flash photography at the time of sunset, etc., the strobe light in a current strobe device or a camera with a built-in strobe has a daylight color temperature (about 6000 ° K.
Since the white light has a color temperature almost the same as that of 7000 ° K), there is a problem that only the subject part is imaged with a different color tone from the peripheral part (the color tone is close to orange because of the sunset). It was

Therefore, as satisfying these demands, as disclosed in Japanese Patent Laid-Open No. 1-254820,
A means for adjusting the color temperature by controlling the voltage applied to the flash arc tube and the light emission time using one strobe device has been proposed.

[0006]

However, the means proposed in the above publication cannot greatly change the voltage applied to the flash tube, so that the desired orange color (color Approximately 5000 in terms of temperature
Cannot be obtained. That is, in the above means,
Due to the characteristics of the flash arc tube, it is not possible to flash light at a low voltage, for example, an applied voltage of about 150 V, so the applied voltage is controlled to a relatively high voltage of about 350 V to about 225 V to flash the flash tube. I am letting you. However, in the control of the applied voltage to this extent, the color of the flash light is about 5800 ° K to 7000 ° K in terms of color temperature, which is in the range of white light, and the color tone is adjusted in the white light. It is a level to perform, and does not freely emit white light to orange light. Therefore, the desired orange light emission could not be obtained even by the above means.

In order to meet such a demand, the present invention has been made by paying attention to the characteristics of the flash light emitting tube, and a flash light emitting device capable of emitting flash light from white light to orange light with one flash light emitting tube. The purpose is to provide.

[0008]

In order to achieve the above object, a flash light emitting device according to the present invention includes a main capacitor 2 which is charged by receiving an output of a charging circuit 1 as shown in a conceptual diagram of FIG. , A sub-capacitor 4 which is selectively charged to a high voltage and a low voltage lower than that required to start the flash light emission operation by receiving the output of the main capacitor 2, and the charge of the sub-capacitor 4 The flash light emitting tube 6 that performs a light emitting operation by discharge, the trigger circuit 7 that applies a trigger voltage to the flash light emitting tube 6 and the charging circuit that charges the main capacitor 2 to the sub capacitor 4 are interposed. A first control means 3 for controlling
It is characterized by being provided in a discharge circuit from the sub-capacitor 4 to the flash arc tube 6 and comprising a second control means 5 for controlling the discharge operation.

[0009]

The main capacitor 2 is charged by the charging circuit 1 and the first control means 3 is operated to charge the sub capacitor 4 with a voltage at which light emission can be started. After this, the second
The control means 5 is operated to apply a trigger voltage by the trigger circuit 7 to discharge the electric charge of the sub-capacitor 4 to the flash light emitting tube 6 and cause the flash light emitting tube 6 to emit light. Immediately after the start of this light emission, that is, by the light emission,
By turning off the second control means 5 and turning on the first control means 3 in a state where the gas inside is ionized, the sub-capacitor 4 emits light from the flash arc tube 6 in this ionized state. Charge to a possible voltage. After that, the first control means 3 and the second control means 5 are alternately turned on / off to cause the flash arc tube 6 to continuously emit light at the low voltage charged in the sub-capacitor 4.

[0010]

The present invention will be described below with reference to the illustrated embodiments.

FIG. 2 is an electric circuit diagram showing the configuration of the flash light emitting device according to the first embodiment of the present invention.

This electric circuit comprises a charging circuit 1 comprising a DC / DC converter for boosting a low voltage of a low voltage DC power supply (not shown) to a DC high voltage, and a voltage dividing resistor R1 connected in parallel to the charging circuit 1. A series circuit composed of R2, a main capacitor 2 connected in parallel to the charging circuit 1 via a backflow prevention diode D1, and a light trigger / light quench electrostatic induction thyristor (hereinafter, simply referred to as an electrostatic induction thyristor. ) Q1, a series circuit including the sub-capacitor 4, and a series circuit including voltage dividing resistors R3 and R4 connected in parallel to the sub-capacitor 4, respectively.
A series circuit including an electrostatic induction thyristor Q2 and a flash arc tube 6, a charging voltage detection circuit 11 having an input terminal connected to a connection point between the resistors R1 and R2, and a connection point between the resistors R3 and R4. A charging voltage detection circuit 12 whose ends are connected,
A trigger circuit 7 for applying a trigger voltage to the trigger electrode 6t of the flash tube 6 and the charging voltage detection circuit 11
And a light emission control circuit 13 which receives the signals from the electrostatic induction thyristors Q1 and Q2 and controls the operation of the trigger circuit 7, and the main part thereof is configured.

The main capacitor 2 is charged to a predetermined voltage (here, 300V) by the high DC voltage supplied from the charging circuit 1, and the sub-capacitor 4 is the electrostatic induction thyristor Q1 described later. The main capacitor 2 is turned on by the action, and the main capacitor 2 is charged by discharging the electric charge.

The trigger circuit 7 is a light emission control circuit 13
Is a circuit for applying a trigger voltage to the trigger electrode 6t under the control of, and the flash light emitting tube 6 is ionized in the flash light emitting tube in which xenon gas or the like is enclosed by applying the trigger voltage. In addition, it is designed to emit a flash of light.

The electrostatic induction thyristor Q1 is a large-current on / off control element, and controls the electrostatic induction thyristor therein by an optical signal. Specifically, it is turned on when the optical trigger signal LT1 is incident, and is turned off when the optical quench signal LQ1 is incident. The electrostatic induction thyristor Q2 is also an element similar to the electrostatic induction thyristor Q1 and performs the same operation as the electrostatic induction thyristor Q1 by the optical trigger signal LT2 and the optical quench signal LQ2. The structure and operating characteristics of this element are described in detail in JP-A-62-7366.

The charging voltage detecting circuit 11 includes the resistor R
The charging voltage of the main capacitor 2 is detected by measuring the voltage at the connection point between 1 and the resistor R2, and this detection information signal is output to the light emission control circuit 13.
Further, the charging voltage detection circuit 12 detects the charging voltage of the sub-capacitor 4 by measuring the voltage at the connection point of the resistors R3 and R4, and outputs this detection information to the light emission control circuit 13. It is like this.

The control signal input terminals P1 and P2 of the light emission control circuit 13 are respectively the charging voltage detection circuit 1 described above.
Output terminals 1 and 12 and a control signal output terminal P3 are connected to the trigger circuit 7, respectively. Further, the terminals P4 to P11 are connected to the LEDs 1, LE as shown in the figure.
D2, LED3 and LED4 are respectively connected.
When the detection information signals from the detection circuits 11 and 12 are input to the output terminals P1 and P2, these LEDs emit light by the light emission control circuit 13 operating based on this information signal. These emitted lights become the light trigger signal LT1, the light quench signal LQ1, the light trigger signal LT2, and the light quench signal LQ2, respectively. Then, the electrostatic induction thyristor Q is generated by the light emission signal of the LED.
1 and Q2 are operated. A control signal for controlling the trigger circuit 7 is output from the output terminal P3 to control the trigger voltage application.

In the figure, reference characters VC1, VC2 and VT respectively indicate measurement points of the charging voltage of the main capacitor 2, the charging voltage of the sub capacitor 4 and the trigger voltage applied to the trigger electrode 6t. The changes in these operating voltages are shown in the timing chart of FIG.

The operation of the first embodiment thus constructed will be described with reference to the timing chart shown in FIG. In the figure, LT1, LQ1, LT2 and LQ2 are the light emission timings of the LEDs 1, LED2, LED3 and LED4, VT, VC2 and VC1 are the voltage waveforms at the measurement points shown in FIG. 2, and IXe is the flash light emission. The flashing light emission current of the tube 6 is shown respectively. Further, S1 to S8 indicate step numbers.

First, the electrostatic induction thyristor Q1 is turned on by the light trigger signal LT1 and the sub-capacitor 4 is charged from the main capacitor 2 (step S1). Is confirmed, the optical quench signal LQ1 is emitted,
As a result, the charging of the sub-capacitor 4 is stopped (step S2).

Next, the electrostatic induction thyristor Q2 is turned on by the light trigger signal LT2, and the trigger circuit 7 applies the trigger voltage to the trigger electrode 6t in that state, and the flash arc tube 6 emits the first flash light. Then, when the charging voltage of the sub-capacitor 4 drops to about 30V (step S3), the static induction thyristor Q2 is turned off by the light quench signal LQ2, and the flash emission of the flash arc tube 6 is stopped (step S4).

Next, the electrostatic induction thyristor Q1 is turned on by the light trigger signal LT1 to charge the sub-capacitor 4 again (step S5), but this time, when the charging voltage of the sub-capacitor 4 becomes 120V, the optical quench is performed. The electrostatic induction thyristor Q1 is turned off by the signal LQ1 and the charging of the sub-capacitor 4 is stopped (step S6).

Then, the electrostatic induction thyristor Q2 is turned on by the light trigger signal LT2, and the flash arc tube 6 is turned on again.
(Step S7), the electrostatic induction thyristor Q2 is turned off by the light quench signal LQ2 when the charging voltage of the sub-capacitor 4 reaches about 30V, as in the case of the first flash emission, and the flash emission tube 6 The flash emission is stopped (step S8). After that, the optical trigger signal LT
1, the control of the charging operation of the sub-capacitor 4 by the light quench signal LQ1 and the control of the flash light emission of the flash light emitting tube 6 by the light trigger signal LT2 and the light quench signal LQ2 are repeated, and the low voltage (120V) flash light emission is performed in a short cycle. Repeat (for example, 0.04 msec).

By the way, assuming that the voltage at both ends of the flash light emitting tube 6 is only about 120 V before the first flash light emission, the trigger electrode 6t
Even if a trigger voltage is applied to the flash, it will not emit flash light. That is, it is usually difficult to cause the flash tube to emit flash light unless a high voltage of about 300 V is applied to both ends of the flash tube such as the flash tube 6.

However, if the flash tube emits flash light once by applying a high voltage (300 V),
Since the gas in the flash tube is ionized, when the second flash light emission is immediately followed by the second flash light emission, a relatively low voltage (120 V in this embodiment) is applied from the second flash light emission. ), The flash light can be emitted sufficiently.

In the present embodiment, the characteristics of this flash arc tube are skillfully utilized, for example, when a high voltage of 300 V is applied, the flash arc tube 6 whose color temperature of flash flash is about 5800 ° K is used to obtain the same color. This makes it possible to emit orange flash light at a temperature of about 5000 ° K. That is,
The first flash light emission is 300V across the flash light emission tube 6.
Is applied to cause the flash tube 6 to emit flash light (color light having a color temperature of about 5800 ° K, which is close to white), but from the second time onward, the flash tube 6 is used by utilizing the above-described characteristics. Flash light emission (color temperature is 50
(00 ° K orange light) is repeated many times in a very short period, so the degree of orange light increases as a whole of the flash emission,
Enables flash photography with orange light.

In order to repeat the flash light emission at a low voltage, it is certain to control the light emission of the flash light emitting tube 6 while detecting the charging voltage of the sub-capacitor 4 as described above, but the charging time for the sub-capacitor 4 is long. Is determined by the charging voltage of the main capacitor 2, this sub capacitor 4
The charging of the sub-capacitor 4 may be controlled according to the charging time without measuring the charging voltage of the sub capacitor 4. Especially, EEPRO
By using a non-volatile memory such as M to store the charging time according to the circuit time constants of the main capacitor 2 and the sub-capacitor 4 in each strobe device, it is possible to control accurately.

Further, the electrostatic induction thyristors Q1 and Q2
It goes without saying that flash light emission of a normal color temperature (about 6000 ° K to 7000 ° K) is possible by turning on both of them at the same time.

FIG. 4 is an electric circuit diagram of a flash light emitting device showing a second embodiment of the present invention.

The main difference between the second embodiment and the first embodiment is that there are two sub-capacitors in this embodiment and that a gate insulation type bipolar transistor (hereinafter referred to as IGBT) is used.
(Referred to as “T”), and when one of these sub-capacitors is discharging the charge, the other is charging.

Now, this electric circuit is a DC / DC for boosting the low voltage of a low voltage DC power supply (not shown) to a DC high voltage.
A charging circuit 1 including a converter, a series circuit including resistance dividing R1 and R2 connected in parallel to the charging circuit 1, and a main circuit connected in parallel to the charging circuit 1 via a backflow prevention diode D1. A series circuit including a capacitor 2 and an IGBTQ3 and a subcapacitor 4 connected in parallel to the main capacitor 2 via a resistor R9, a series circuit including a subcapacitor 4a and an IGBTQ4, and a series circuit connected between the IGBTQ3 and the IGBTQ4. Flashing arc tube 6, a series circuit including transistors Tr1 and Tr2, a resistor R10, and a transistor Tr3, and a voltage dividing resistor R connected in parallel to the sub-capacitor 4.
A series circuit composed of R3 and R4, a charging voltage detection circuit 11 having an input terminal connected to a connection point of the resistors R1 and R2,
A charging voltage detection circuit 12 having an input terminal connected to a connection point of the resistors R3 and R4, a trigger circuit 7 for applying a trigger voltage to the trigger electrode 6t of the flashlight emission tube 6, the charging voltage detection circuit 11 and In response to the signal from 12, the IGBTs Q3 and Q4 and the trigger circuit 7
The light emission control circuit 13a for controlling the operation of the above is connected to the main part as shown in the figure.

The IGBTs Q3 and Q4 are well-known gate insulation type bipolar transistors, which are semiconductor elements capable of controlling a large current, and are surely turned on by applying a gate voltage of about 15 V or more to the emitter. It has become. In order to generate this gate voltage, the above I
Shunt Zener diodes D3 and D2 are inserted between the gates and emitters of the GBTs Q3 and Q4 as shown in the figure. Note that the IGBTs Q3 and Q4 use elements having opposite polarities, and the gate of one IGBT Q3 is connected to the collector of the transistor Tr1 and the other I
The gate of the GBQQ4 is connected to the collectors of the transistors Tr3 and is controlled by turning on / off these transistors.

The main capacitor 2 is charged to a predetermined voltage (here, 300V) by the high DC voltage supplied from the charging circuit 1 as in the first embodiment, and the sub capacitors 4 and 4a are As will be described later, the IGBTs Q3 and Q4 are turned on, respectively, and the electric charges stored in the main capacitor 2 are discharged to be charged. In addition, the above-mentioned IGBT
By alternately turning on and off Q3 and Q4, it is possible to charge one of these sub-capacitors 4 and 4a while the other is discharging the charge.

The control signal input terminals P1 and P2 of the light emission control circuit 13a are respectively the charging voltage detection circuit 1 described above.
Output terminals 1 and 12 and a control signal output terminal P3 are connected to the trigger circuit 7, respectively. further,
The terminals P12 to P14 are connected to the transistor Tr1 as shown.
~ Each is connected to each base of the transistor Tr3. In addition, these transistors are connected to the output terminal P
When the detection information signals from the detection circuits 11 and 12 are input to 1 and P2, the light emission control circuit 13a operates on the basis of this information signal to perform on / off operation.
The IGBTs Q3 and Q4 are operated by turning on / off the transistors Tr1 to Tr3. A control signal for controlling the trigger circuit 7 is output from the output terminal P3 to control the trigger voltage application.

The other construction and operation are the same as those of the first embodiment, and the description thereof is omitted here.

In the figure, reference characters VC4, VC4a and VT are
The measurement points of the charging voltage of the sub-capacitor 4, the charging voltage of the sub-capacitor 4a, and the trigger voltage applied to the trigger electrode 6t are shown respectively. Changes in these operating voltages are shown in the timing chart of FIG.

The operation of the second embodiment thus constructed will be described with reference to the timing chart shown in FIG. In the figure, Tr1, Tr2, Tr3, Q3 and Q4 are the transistors Tr1, Tr2, Tr3 and IGB, respectively.
The operating states of TQ3 and IGBTQ4 are changed to VC4, VC4a, V
T indicates the voltage waveforms at the measurement points shown in FIG. 4, respectively. Further, S11 to S19 indicate step numbers.

In the second embodiment, first, as in the first embodiment, the charging voltage detecting circuit 11 detects the voltage divided by the resistors R1 and R2, and the main capacitor 2 has a predetermined voltage (again, in the first embodiment described above). It is charged up to 300 V as in the example.

Next, by turning on the transistors Tr2 and Tr3, the IGBT Q3 is turned on, and the main capacitor 2 to the sub capacitor 4 are turned on via the resistor R9.
Is charged (step S11). Then, in the charging voltage detection circuit 12, the charging voltage of the sub-capacitor 4 is 300
When it is confirmed that the voltage has become V, the transistor Tr3 is turned off to turn off the IGBT Q3 to stop the charging of the sub-capacitor 4 (step S12).

Thereafter, the trigger circuit 7 is operated to apply a trigger voltage to the trigger electrode 6t to cause the flash light emitting tube 6 to emit flash light by the charging voltage of the sub-capacitor 4 and turn on the transistor Tr1 to operate the IGBT Q4. Then, the charging of the sub-capacitor 4a is started (step S13).

Further, in this case, if the capacities of the subcapacitor 4 and the subcapacitor 4a are made equal, the charging voltage detecting circuit 12 measures the time T1 until the charging voltage of the subcapacitor 4 becomes 120V ( Step S1
4), sub-capacitor 4 for a time equal to this time T1
If a is charged, it can be charged to approximately 120V without detecting the charging voltage of the sub-capacitor 4a. That is, the transistor Tr1 is set to the time T
The IGBTQ4 is turned off after 1 and the charging of the sub-capacitor 4a is stopped (step S15), but the charging voltage of the sub-capacitor 4a at this time is approximately 120V.
Should be.

Similarly to the above, the trigger circuit 7 is operated to apply a trigger voltage to the trigger electrode 6t to cause the flash light emitting tube 6 to emit flash light at the charging voltage of the sub-capacitor 4a and turn on the transistor Tr3 to turn on the IG.
The BTQ 3 is operated to start charging the sub-capacitor 4 (step S16). After that, when the charging voltage of the sub-capacitor 4 reaches 120 V (time T2 has elapsed from the start of charging), the transistor Tr3 is turned off to stop the charging of the sub-capacitor 4 (step S17). Then, in the same manner as described above, the flash light emitting tube 6 is caused to emit light by the charging voltage of the sub capacitor 4 and the sub capacitor 4a
Charging is started (step S18), and after the lapse of time T2,
The charging of the sub-capacitor 4a is stopped (step S1).
9).

After that, when the flash light emitting tube 6 repeats flash light emission, the charging voltage of the main capacitor 2 is gradually lowered and the charging time to the sub capacitor is extended, but the sub capacitor 4
The charging time to the battery is measured each time (T1, T2,
T3 ...), the sub-capacitor 4a can be charged to substantially the same voltage as the sub-capacitor 4, that is, 120V, if the charging time for the next sub-capacitor 4a is set.

FIG. 6 is an electric circuit diagram of a flash light emitting device showing a third embodiment of the present invention.

The main difference between the third embodiment and the first embodiment is that the thyristors Q5 and I are large current control elements.
This means that GBTQ6 and Q7 are used. In this case I
The GBT Q6 can have a smaller withstand current capacity than the IGBT Q7.

Now, this electric circuit is a DC / DC which boosts the low voltage of a low voltage DC power supply (not shown) to a DC high voltage.
A charging circuit 1 including a converter, a series circuit including voltage dividing resistors R1 and R2 connected in parallel to the charging circuit 1, and a main circuit connected in parallel to the charging circuit 1 via a backflow prevention diode D1. A capacitor 2, a series circuit including a sub-capacitor 4 and an IGBT Q6 connected in parallel to the main capacitor 2 via a thyristor Q5, a series circuit including a flash tube 6 and an IGBT Q7, and a sub-capacitor 4 in parallel. A series circuit composed of connected voltage dividing resistors R3 and R4, a capacitor C6 and a resistor R12, which are connected in parallel to the thyristor Q5.
A series circuit composed of R13, a resistor R11 connected in parallel with the capacitor C6, a diode D4 connected in parallel with the IGBTQ6, and a charging voltage with an input terminal connected to a connection point of the resistors R1 and R2. A detection circuit 11,
A charging voltage detection circuit 12 having an input terminal connected to a connection point of the resistors R3 and R4, a trigger circuit 7 for applying a trigger voltage to the trigger electrode 6t of the flashlight emission tube 6, the charging voltage detection circuit 11 and In response to the signal from 12, the IGBTs Q6 and Q7 and the trigger circuit 7
The light emission control circuit 13b for controlling the operation of the above is connected to the main part as shown in the figure.

The gate of the thyristor Q5 is connected to the connection point of the resistors R12 and R13, and the potential difference across the resistor R13 serves as a gate voltage to turn on the thyristor Q5 and charge the sub-capacitor 4. To control.

The IGBTs Q6 and Q7 are gate-insulated bipolar transistors for controlling charge / discharge of the sub-capacitor 4 and flash light emission of the flash light emitting tube 6, respectively.

The main capacitor 2 is the first and second
Similar to the embodiment, the DC high voltage supplied from the charging circuit 1 is charged to a predetermined voltage (here, 300V), and the sub-capacitor 4 is, as described later,
When the thyristor Q5 is turned on and the electric charge stored in the main capacitor 2 is discharged, the thyristor Q5 is charged.

The light emission control circuit 13b includes the first and second light emission control circuits.
Similar to the embodiment, the control signal input terminals P1 and P2 are respectively at the output terminals of the charging voltage detection circuits 11 and 12, and
The control signal output terminals P3 are connected to the trigger circuits 7, respectively. Further, the terminals P21 and P22 are respectively connected to the gates of the IGBTs Q6 and Q7 as shown. These IGBTs have the output terminals P
When the detection information signals from the detection circuits 11 and 12 are input to 1 and P2, the light emission control circuit 13b outputs a signal based on this information signal from the terminals P21 and P22 to perform on / off operation. To do. Also, the output terminal P3
From the above, as in the first and second embodiments, a control signal for controlling the trigger circuit 7 is output to control the application of the trigger voltage.

In the figure, reference characters VC5, VC6 and VT respectively indicate measurement points of the charging voltage of the main capacitor 2, the charging voltage of the sub capacitor 4 and the trigger voltage applied to the trigger electrode 6t. Changes in these voltages due to the operation are shown in the timing chart of FIG.

The operation of the third embodiment thus constructed will be described together with the timing chart shown in FIG. In the figure, Q6 and Q7 are the IGBTs Q6 and I, respectively.
The operating state of GBTQ7, VT, VC6, and VC5 are the voltage waveforms at the measurement points shown in FIG. 6, and IXe is the flashlight emission current waveform of the flashlight emission tube 6. Further, S21 to S27 indicate step numbers.

The operation of the third embodiment will be described. First, similar to the first and second embodiments, the voltage divided by the resistors R1 and R2 is detected by the charging voltage detection circuit 11 and a predetermined voltage is supplied to the main capacitor 2. The battery is charged up to the voltage (here, 300 V as in the first and second embodiments).

Next, the signal from the output terminal P21 is used for IGB.
When TQ6 is turned on, the potential at the point VC6 is lowered to the GND level. Then, the gate of thyristor Q5
A potential difference is generated between the cathodes and the thyristor Q5 is turned on to start charging the sub-capacitor 4 (step S21). When the charging voltage detection circuit 12 confirms that the charging voltage of the sub-capacitor 4 has reached 300 V, the output signal of the terminal P21 is set to the "L" level to turn off the IGBT Q6 and stop the charging of the sub-capacitor 4. (Step S22).

After that, an "H" level signal is output from the output terminal P22 to turn on the IGBT Q7, and
By operating the trigger circuit 7 and applying the trigger voltage to the trigger electrode 6t, the flash light emitting tube 6 is caused to emit flash light (step S23). When the charging voltage of the sub-capacitor 4 becomes about 30V, the IGBT Q7 is turned off to stop the light emission of the flash light emitting tube 6 (step S2).
4).

Next, the IGBT Q6 is turned on to restart the charging of the sub-capacitor 4 (step S25), and when the charging voltage of the sub-capacitor 4 reaches 120 V, the IGBT Q6 is turned off to stop the charging ( Step S26). Then, in the same manner as above, the flash light emitting tube 6 is caused to emit flash light (step S27).

Thereafter, the charge of the sub-capacitor 4 by the IGBT Q6 and the control of the flash light emission of the flash light emitting tube 6 by the IGBT Q7 are repeated to repeat the low voltage (120 V) flash light emission.

In the first to third embodiments, when all the electric charge of the main capacitor 2 is used for flash light emission, the charging time of the sub-capacitor 4 (including the sub-capacitor 4a in the second embodiment) is required. It can be easily realized by repeating flash light emission until a predetermined time is exceeded.

Next, when controlling the light quantity of the flash tube 6, the relationship between the charging voltage of the sub-capacitor as shown in Table 1 below and the guide number (hereinafter GNo) and the color temperature of one flash emission is shown. To use.

[0060]

[Table 1]

For example, when the color temperature is 5000 ° K, the flash tube 6 is flashed, and the total light quantity is GNo1.
Consider the case where you want to make 2.

In the first flash emission, the voltage applied to the flash arc tube 6 is 300 V, so that GNo 3.0, the second and subsequent flashes,
Since it is 120V, it is GNo 1.2. Therefore, if the number of times of flash light emission of the flash light emitting tube 6 at an applied voltage of 120 V is N,

[0063]

[Equation 1]

Because it is

[0065]

[Equation 2]

Therefore, N ≈ 94, and flash light emission with an applied voltage of 120 V may be performed 94 times. For other light amounts, the number of times of flash light emission may be calculated in the same manner, and the required GNo.
Alternatively, a table of the number of flashes may be used.

[0067]

[Table 2]

[0068]

As described above, according to the present invention, a high voltage is temporarily applied to the flash light emitting tube when the light emitting operation of the flash light emitting tube is started, and the high voltage is applied after the light emission of the flash light emitting tube is started. By applying a low voltage lower than the voltage intermittently to the same flash tube, it is possible to flash from white light to orange light with one flash tube, and it is easy to expand the range of photography. There is an effect that a device can be provided.

[Brief description of drawings]

FIG. 1 is a configuration block diagram of a flash light emitting device showing the concept of the present invention.

FIG. 2 is an electric circuit diagram showing a configuration of a flash light emitting device that is a first embodiment of the present invention.

FIG. 3 is a timing chart showing a specific operation of the flash light emitting device according to the first embodiment.

FIG. 4 is an electric circuit diagram showing a configuration of a flash light emitting device that is a second embodiment of the present invention.

FIG. 5 is a timing chart showing a specific operation of the flash light emitting device according to the second embodiment.

FIG. 6 is an electric circuit diagram showing the configuration of a flashlight emitting device that is a third embodiment of the present invention.

FIG. 7 is a timing chart showing a specific operation of the flash light emitting device according to the third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Charging circuit 2 ... Main capacitor 3 ... 1st control means 4 ... Sub-capacitor 5 ... 2nd control means 6 ... Flash arc tube 7 ... Trigger circuit 11, 12 ... Charge voltage detection circuit 13 ... Light emission control circuit

Claims (1)

Claim: What is claimed is: 1. A main capacitor which is charged by receiving an output of a charging circuit, a high voltage required to start an emission operation of a flash light by receiving an output of the main capacitor, and a voltage lower than that. A sub-capacitor that is selectively charged to a low voltage, a flash light-emitting tube that performs a light-emitting operation by discharging the charge stored in the sub-capacitor, a trigger means for this flash light-emitting tube, and the main capacitor to the sub-capacitor. First control means interposed in the charging circuit and controlling the charging operation, and second control means interposed in the discharging circuit from the sub-capacitor to the flash arc tube and controlling the discharging operation. The first control means and the second control means temporarily apply a high voltage to the flash light emitting tube at the start of the light emitting operation of the flash light emitting tube. A flash light-emitting device characterized in that a low voltage lower than the high voltage is intermittently applied to the flash light-emitting tube after the light-emission of the arc-tube is started.