JP3297453B2 - Strobe device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insulated gate bipolar transistor which controls the light emitting operation of a flash tube in series with the flash tube.
r; G. FIG. B. T. In particular, the present invention relates to a strobe device having a feature in a voltage supply system to the flash discharge tube, which is effective when emitting light at high speed repeatedly.

[0002]

2. Description of the Related Art Conventionally, the I.D. G. FIG. B. T.
Japanese Patent Application Laid-Open No. 64-170
The device disclosed in Japanese Patent Publication No. 33 is well known.

[0003] As shown in FIG.
A DC high-voltage power supply 1 which is a C-DC converter circuit; a main capacitor 2 charged by the power supply 1; a constant voltage circuit 3 which is provided with the power supply 1 and supplies a constant voltage to a light emission control circuit 7 described later; A known trigger circuit 4, which is connected to a control means 8 in the camera body, and which sends and receives various signals and generates various output signals such as a trigger signal for operating the trigger circuit 4; Flash discharge tube 5 I. connected in series G. FIG. B. T. A flash control circuit 7 for controlling on / off of the flash discharge tube 5 to control light emission of the flash discharge tube 5 and a voltage doubler circuit 9 for applying a double voltage of the charging voltage of the main capacitor 2 to the flash discharge tube 5. ing.

When the switch Sw is turned on in the above apparatus, the DC high-voltage power supply 1 operates, and the main capacitor 2 and the voltage doubler capacitor 9a are charged with the high voltage output from the DC high-voltage power supply 1 as shown in the polarity. A power supply capacitor C that functions as a power supply for the control circuit 6 with the low-voltage power supply E
e is charged, and further, the capacitor 3a of the constant voltage circuit 3 is charged. Therefore, the control circuit 6 starts operating, and the light emission control circuit 7 enters a light emission preparation state.

In the state where each of the capacitors has been charged, when a light emission start signal is input from the control means 8 to the control circuit 6, the control circuit 6 operates and outputs a high level signal from the output terminal Oa to emit light. Transistor Q of control circuit 7
a, Qb are turned on.

When the transistors Qa and Qb are turned on, I.V. G. FIG. B. T. Turns on. Therefore, the voltage doubler 9 operates and the voltage doubler 9
When the charging voltage a is applied between the main electrodes of the flash discharge tube 5, the trigger circuit 4 also operates to excite the flash discharge tube 5, and as a result, the flash discharge tube 5 consumes the charge of the main capacitor 2. And emit light.

In the course of the light emission, when a light emission stop signal is input from the control means 8 to the control circuit 6, the control circuit 6 operates, and outputs a high level signal from the output terminal Ob to output the transistors Qc and Qc of the light emission control circuit 7. Turn on Qd. As a result, the transistor Qb which has been turned on until then,
I. G. FIG. B. T. Is turned off, and as a result, the flash discharge tube 5 stops emitting light.

The above operation is a basic operation of the conventional device shown in FIG.

[0009]

SUMMARY OF THE INVENTION G. FIG. B. T. A strobe device using a light emitting device is well known. Unlike a conventional device in which light emission is stopped using a commutation capacitor, there is no light emission over, and a high-speed repetitive light emission operation and miniaturization of the device shape can be realized. Become.

However, when the high-speed repetitive light emission operation is examined in detail, it still has the following problems.

That is, when the cycle of the high-speed repetitive light emission operation becomes a high cycle equal to or longer than a predetermined cycle, for example, a certain cycle band of several tens Hz or more, in the configuration shown in FIG. It is conceivable that the next light emitting operation will be performed before the operation is performed. In such a case, the operation of the voltage doubler circuit 9 cannot be expected, so that the flash discharge tube 5 cannot be made to emit light, and light emission is lost. Has the following disadvantages.

More specifically, the voltage doubler 9
a indicates that the charging is started only when the cathode potential of the flash discharge tube 5 is set to the low level, in other words, that the charging is not performed while the cathode potential is at the high level, according to the circuit configuration shown in the drawing. it is obvious.

By the way, the cathode potential is set to a value corresponding to the flash discharge tube 5.
Once the light is emitted, the period until the ionization state ends and returns to the initial state even if the energy supply is stopped,
It is well known that the potential is maintained at a high potential, and the voltage doubler capacitor 9a has an appropriate charging time constant.
If the next light emitting operation is performed during the above-described period or at the time when the time constant has not elapsed even after the elapse of the above-described period, the charging capacitor 9a is not sufficiently charged, As a result, the operation of the voltage doubler 9 cannot be expected.

In the case of an extremely high period exceeding a certain period band, the operation for the next light emission is performed when the flash discharge tube 5 can emit light without being triggered. Therefore, it is well known that the flash discharge tube 5 emits light very easily, and does not cause the light emission omission described above.

On the other hand, when considering the miniaturization and increase of the amount of emitted light in the flash discharge tube, a method of increasing the internal gas pressure and increasing the impedance is well known.

In the above method, it is known that the discharge starting voltage of the flash discharge tube increases. In addition, considering the high-speed repetitive light emission operation, the heat radiation characteristic is deteriorated due to miniaturization.
In addition, the heat accumulation characteristic becomes high by high impedance,
It is conceivable that the light emission starting voltage is further increased. In view of the above situation, the fact that the operation of the voltage doubler circuit cannot be expected is more disadvantageous to the light emission of the flash discharge tube.

The present invention has been made in consideration of the above-mentioned disadvantages, and additionally includes a voltage doubler capacitor so that the terminal connected to the cathode of the flash discharge tube is charged to a high potential. By connecting so that the voltage between the main electrodes of the flash discharge tube can be boosted during the light emission operation, the above-mentioned doubler capacitor can be rapidly charged through the flash discharge tube in the ionized state, and high-speed repetitive emission of several tens of Hz or more is achieved. It is an object of the present invention to provide a strobe device which can employ a flash discharge tube having a small size and a high impedance, which can surely perform a next light emitting operation at the time of operation.

[0018]

A strobe device according to the present invention comprises a DC high-voltage power supply, a main capacitor connected to both ends of the DC high-voltage power supply, and a main capacitor connected to both ends of the main capacitor.
The flash discharge tube, the first diode, and the I.D. G. FIG. B. T. And the above main capacitor
A first series connection body formed by series-connected so that it can release the DENDEN load, the first control switch element and the second da and a second diode from the first control switch element having a control electrode
The first diode and the I.D. are connected in series so that current flows through the first diode. G. FIG. B. T. A second series-connected body connected in the forward direction to both ends of the series body; a voltage-doubler capacitor having one end connected to the anode of the second diode; an anode connected to the cathode of the flash discharge tube; A third diode connected to the other end of the voltage-doubler capacitor, and a series body composed of the flash discharge tube and the third diode are connected in parallel to connect the voltage-doubler capacitor through the second diode. A charging means connected to both ends of the main capacitor to charge the voltage-doubler capacitor so that the other end has a high potential; and a control electrode. G. FIG. B. T. A second control switch element connected in a forward direction between the collectors of the second control switch element and a control electrode of the second control switch element which outputs an ON voltage for turning on the second control switch element when a light emission start signal is supplied. Operate in response to the supply of the operation control circuit and the light emission start signal to the operation control circuit,
A switch control means including a gate means for outputting an ON voltage for turning on the first control switch element and supplying the ON voltage to a control electrode of the first control switch element; G. FIG. B. T. When the emission start signal is supplied to the operation control circuit at least, the I.I. G. FIG. B. T. Is supplied to the control electrode of G. FIG. B. T. , A drive control circuit for turning on, the second control switch element, and the I.I. G. FIG. B. T. And a trigger capacitor and a trigger transformer connected in parallel with the series body comprising the second control switch element and the I.I.
G. FIG. B. T. And a trigger circuit for exciting the flash discharge tube with a high voltage generated in the trigger transformer by a discharge operation of the trigger capacitor through the trigger transformer.

[0019]

Since the strobe device according to the present invention is constructed as described above, the voltage doubler capacitor is connected to the terminal connected to the third diode by the charging means, that is, connected to the cathode of the flash discharge tube via the third diode. The terminal to be charged is charged via the second diode so as to have a high potential.

When the switch control means operates in response to the supply of the light emission start signal and the first and second control switch elements are turned on, I.P. G. FIG. B. T. Is in the ON state, the trigger circuit operates to excite the flash discharge tube, and at the same time, the charging voltage of the voltage doubler capacitor is changed to the second control switch element, I.I. G. FIG. B. T. The main capacitor and the first
The voltage is applied between the main electrodes of the flash discharge tube via the control switch element.

Therefore, the voltage between the main electrodes of the flash discharge tube is controlled to a higher voltage value than the charging voltage of the main capacitor.

As a result, the flash discharge tube easily starts its light emitting operation, and emits light by consuming the charged charge of the main capacitor.

On the other hand, I.P. G. FIG.
B. T. Is turned off, the discharge loop of the main capacitor and the doubler capacitor is cut off, the flash discharge tube becomes ionized, stops emitting light, and the doubler capacitor is ready for charging.

When the flash tube is ionized, its cathode potential becomes high. In the present invention, a third connection between one end of the voltage doubler capacitor and the cathode of the flash tube is provided.
A diode, so that the voltage-doubler capacitor is connected to the I.D. G. FIG. B. T. , The charging by the high potential of the cathode is started.

This charging is performed via the flash discharge tube and the third and second diodes in the ionized state, unlike the charging by the charging means, and the charging time constant can be set extremely small. become. That is,
The voltage doubler according to the present invention has the following features. G. FIG. B. T. Is turned off, charging is instantaneous. As a result, even when a high-frequency repetitive light-emitting operation is performed, the charging voltage of the voltage doubler capacitor can always be applied to the flash discharge tube, and the above-described repetitive light-emitting operation causes light emission loss. It can be realized without.

[0026]

FIG. 1 is an electric circuit diagram showing an embodiment of a strobe device according to the present invention. In the drawing, elements having the same reference numerals as those in FIG. 5 indicate elements having the same functions.

A main capacitor 2 is connected to both ends of a DC high-voltage power supply 1 composed of a well-known DC-DC converter circuit and a laminated power supply.

A flash discharge tube 5 is provided at both ends of the main capacitor 2.
, The first diode 12 and the I.D. G. FIG. B. T. And a first series-connected body 10 in which a series body 11 is connected in series.

I. G. FIG. B. T. Form switch control means together with an operation control circuit 20 described later. G. FIG. B. T. Is connected to the output terminal 13a of the drive control circuit 13 for controlling the conduction and non-conduction operations of the drive control circuit 13.

The drive control circuit 13 includes I.O.
G. FIG. B. T. Is turned on in response to the operation of the DC high-voltage power supply 1 and turned off when a light emission stop signal is supplied, or I. G. FIG. B.
T. Is controlled in response to a light emission start signal, that is, turned on only during a light emission operation, and turned off when a light emission stop signal is supplied.

At both ends of the series body 11, a second series connection body formed by connecting in series a transistor 15 as a first control switch element and a second diode 16 having a resistor and a control pole not shown. 14 are connected.

The voltage doubler capacitor 17 has one end connected to the anode of the second diode 16 and the other end connected to the I.V. capacitor 18 via an SCR 18 which is a second control switch element having a control pole. G. FIG. B. T. Connected to the collector. The other end of the voltage doubler capacitor 17 is connected to the cathode of the third diode 19 whose anode is connected to the cathode of the flash discharge tube 5.

The gate, which is the control pole of the SCR 18, forms a switch control means together with the drive control circuit 13, operates in response to the supply of a light emission start signal to its input terminal 20a, and switches the SCR 18 from the output terminal 20b. It is connected to the output terminal 20b of the operation control circuit 20 that generates and outputs an on-voltage for the on-operation.

The base, which is the control pole of the transistor 15, includes an input terminal 21a to which a light emission start signal is supplied, a reference power supply terminal 21b to which an appropriate reference power is applied, and first and second terminals.
Transistors 22, 23, resistors 24, 25, 26, 2
7, 28, and 29. The reference power source is connected to the base in response to the supply of the light emission start signal to the input terminal 21a.
Connected to a gate means 21 which forms a switch circuit for supplying power to the switch. It is clear that the gate means 21 functions as a current amplifier circuit.

The charging resistor 31 forms a charging means 30 for charging the voltage doubler capacitor 17 via the second diode 16.

Further, a trigger capacitor 33 and a trigger transformer 34 are provided.
G. FIG. B. T. Trigger capacitor 33 by turning on
Trigger circuit 32 which excites the flash discharge tube 5 by discharging through the SCR 18 and the trigger transformer 34 described above.
Are SCR18 and I. G. FIG. B. T. Are connected to both ends of a series body consisting of

Hereinafter, the operation of the embodiment of the strobe device according to the present invention shown in FIG. 1 will be described in detail. It is assumed that the drive control circuit 13 employs a circuit based on the former of the two control methods described above.

When the DC high voltage power supply 1 starts operating by turning on an appropriate power switch (not shown), the main capacitor 2 is charged to the indicated polarity by the DC high voltage output between its output terminals. At the same time, the drive control circuit 13 becomes operative in response to the start of the operation of the DC high-voltage power supply 1, and I.P. G. FIG. B. T. Is output, so that at this point, I.V. G. FIG.
B. T. Is brought into the conduction preparation state.

At the same time, the doubler capacitor 17 and the trigger capacitor 33 are charged to the illustrated polarity, that is, the terminal connected to the cathode of the flash discharge tube 5 via the third diode 19 is set to a high potential. Charging is performed via the charging resistor 31 and the second diode 16 as the charging means 30 or the charging resistor 31 and the trigger transformer 34, respectively.

When a light emission start signal is supplied to the input terminal 20a of the operation control circuit 20 at an appropriate point in time when the main capacitor 2 and the like are charged, the operation control circuit 20 operates, and the output terminal 20b of the operation control circuit 20 operates. The ON voltage of the SCR 18 is output and supplied to the gate of the SCR 18.

At the same time, the light emission start signal is supplied to the gate means 2
The first input terminal 21a is also supplied to the first input terminal 21a, so that the first and second transistors 22 and 23 constituting the gate means 21 are turned on, and the reference power supplied to the reference power supply terminal 21b is supplied via the second transistor 23. And supplied to the base of the transistor 15.

Therefore, the SCR 18 is provided by I.D. G. FIG.
B. T. Are turned on when the ON voltage is supplied, and the transistor 15 is also turned ON at the same time.

When the SCR 18 is turned on, the charge stored in the trigger capacitor 33 is changed to the SCR 18, I. G. FIG. B. T. The flash discharge tube 5 is instantaneously discharged through the primary winding of the trigger transformer 34, and is excited by the high voltage induced in the secondary winding. At this time, in the primary winding,
For the resonance operation occurring between the trigger capacitor 33 and
Therefore, an oscillating voltage is induced. On the other hand, in the present embodiment, the high potential side terminal of the trigger capacitor 33 is connected to the cathode of the flash discharge tube 5 via the third diode 19, so that the resonance operation causes Part of the oscillating voltage is
The voltage is applied between the main electrodes of the flash discharge tube 5 via the main capacitor 2, the third diode 19 and the trigger capacitor 33.

When the transistor 15 is turned on, the charging voltage of the voltage doubler capacitor 17 is changed to the SCR 18, I.V. G. FIG.
B. T. Is applied between the main electrodes of the flash discharge tube 5 via the main capacitor 2 and the transistor 15.

Therefore, between the main electrodes of the flash discharge tube 5, in addition to the charging voltage of the main capacitor 2, a part of the oscillation voltage induced in the temporary winding of the trigger transformer 34 and the charging voltage of the voltage doubler capacitor 17 are generated. Will be applied,
As a result, the flash discharge tube 5 starts the light emitting operation very easily, and the main capacitor 2 is turned on at the time when the SCR 18 is turned on.
Emits light by consuming the charged electric charge.

When an emission stop signal is supplied to the drive control circuit 13 at an appropriate point in time when the flash discharge tube emits light, the drive control circuit 13 sets the I.D. G. FIG. B. T. Off. What
At this time, the transistor 15 outputs the light emission stop signal.
At the time of supply to the drive control circuit 13, that is,
When the light emission stops, a light emission start signal is not necessary,
The supply to the input terminal 21a of the means 21 is also stopped and the
Off because the registers 22, 23 are turned off
are doing.

I. G. FIG. B. T. Is turned off, the discharge current flowing through the flash discharge tube 5 is interrupted, the flash discharge tube 5 stops emitting light, and returns to the initial state through the above-described ionized state.

At the same time, the SCR1
8, I. G. FIG. B. T. The discharge loop through the SCR 18 of the trigger capacitor 33, I.D. G. FIG. B. T.
Is interrupted, and the voltage doubler capacitor 17 and the trigger capacitor 33 are interrupted.
Will be ready for charging.

As a result, a loop of the main capacitor 2, the flash discharge tube 5, the third diode 19, the voltage doubler capacitor 17, and the second diode 16, the main capacitor 2, the flash discharge tube 5, the third diode 19, and the trigger capacitor 33 are formed. Current flows through the loop of the trigger transformer 34, and the voltage doubler capacitor 17, the trigger capacitor 33
Will be charged instantly.

That is, even if the flash discharge tube 5 is in an ionized state and its cathode potential is high,
7. Since the trigger capacitor 33 is charged so that the terminal of the flash discharge tube 5 connected to the cathode thereof has a high potential as described above, the charging operation is performed by the flash discharge tube 5. 5 is performed without any trouble from the point of time when it is in the ionized state. G. FIG. B. T. Will be started at the same time as turning off.

As a result, the supply of the light emission stop signal to the drive control circuit 13 is stopped after a very short time and the light emission start signal is again supplied to the gate of the SCR 18 in order to perform the light emission operation at a high cycle of several tens Hz or more. Even if this is the case, the voltage doubler capacitor 17 and the like are connected to the I.D. G. FIG. B. T.
Is instantaneously charged during the OFF operation of
When the CR 18 is turned on, the flash discharge tube 5 can be always excited, and the charging voltage of the voltage doubler capacitor 17 can be applied between its main electrodes, so that the flash discharge tube 5 can be prevented from missing light emission.

FIG. 2 is an electric circuit diagram showing another embodiment of a strobe device according to the present invention. In the drawing, components having the same reference numerals as those in FIG. 1 indicate the same components.

As is clear from FIG. 2, this embodiment is different from the embodiment shown in FIG. 1 in that the gate means 21 comprises a switch circuit including a plurality of transistors.
Is a simplified example.

That is, in this example, a fourth diode 35 whose cathode is connected to the anode of the SCR 18 is connected instead of the transistor 22 whose base is connected to the input terminal to which the light emission start signal is supplied.

The operation of the embodiment shown in FIG. 2 will be described below. However, as described above, the only difference is the difference between the transistor 22 and the fourth diode 35. It goes without saying that the operation of boosting the voltage between the main electrodes of the flash discharge tube 5 by the charged electric charge is the same as that of the previous embodiment. The drive control circuit 13 includes the DC high-voltage power supply 1 as in the previous embodiment.
Is adopted.

When the DC high-voltage power supply 1 starts operating, the main capacitor 2, the doubler capacitor 17, and the like are charged to the polarity shown in FIG.
Starts operating, and I. G. FIG. B. T. Is turned on.

When a light emission start signal is supplied to the input terminal 20a of the operation control circuit 20 in a state where the capacitors 2 and the like have been charged, the operation control circuit 20 operates and turns on the SCR 18.

When the SCR 18 is turned on, I.D. G. FIG. B.
T. Is in the ON state, and the anode potential thereof is at a low level, so that the trigger circuit 32 operates as in the previous embodiment, and the flash discharge tube 5 is excited in a well-known manner and the primary winding of the trigger transformer 34 is induced. A part of the generated oscillating voltage is applied between the main electrodes of the flash discharge tube 5.

At the same time, the transistor 2 of the gate means 21
3 also has its base connected to the S
Since it is connected to the anode of the CR 18, it is set to a low potential, and is turned on when the SCR 18 is turned on.

Accordingly, an appropriate reference power supply is applied to the base of the transistor 15 from the reference power supply terminal 21b via the transistor 23, and the transistor 15 also turns on when the SCR 18 turns on.
As in the previous embodiment, the charging voltage of the voltage doubler capacitor 17 is S
CR18, I.R. G. FIG. B. T. The voltage is applied between the main electrodes of the flash discharge tube 5 via the main capacitor 2 and the transistor 15.

Therefore, as in the previous embodiment, in addition to the charging voltage of the main capacitor 2, a part of the oscillating voltage and the doubler capacitor 17 are provided between the main electrodes of the flash discharge tube 5.
The flash discharge tube 5 starts the light emitting operation very easily, and emits light by consuming the charged charge of the main capacitor 2.

During the light emission of the flash discharge tube 5, the light emission stop signal is supplied to the drive control circuit 13 so that the I.I. G. FIG. B.
T. Is turned off, the main capacitor 2, the voltage doubler capacitor 17 and the trigger capacitor 33 as in the previous embodiment.
Is interrupted, so that the voltage doubler capacitor 17 and the trigger capacitor 33 are instantaneously charged via the flash discharge tube 5, the third diode 19 and the like. What
At this time, I. G. FIG. B. T. SCR18 by turning off
Is turned off, so that the base current of the transistor 23 is supplied.
The loop is cut off and this transistor 23 is turned off.
Thereby, the reference power supply to the base of the transistor 15 is
The supply via the transistor 23 is cut off,
The star 15 is also turned off.

As a result, I.I. G. FIG. B. T. A very short time after the OFF point of the above, the supply of the light emission stop signal to the drive control circuit 13 is stopped, and at the same time, the light emission start signal is supplied to the gate of the SCR 18;
The flash discharge tube 5 can always be excited, and the charging voltage of the voltage doubler capacitor 17 can be applied between the main electrodes thereof so as to be superimposed on the charging voltage of the main capacitor 2. The operation can be performed stably without causing light emission loss.

FIG. 3 is an electric circuit diagram showing still another embodiment of the strobe device according to the present invention. In the drawing, components having the same reference numerals as those in FIGS. 1 and 2 indicate the same components.

As is clear from FIG. 3, this embodiment controls the operation of the transistor 15 which is constituted by the gate means 21 including the switch circuit having the transistor in the embodiment shown in FIGS. This is an example in which the system is configured to use the discharging operation of the voltage doubler capacitor 17.

That is, instead of the gate means 21, the resistance 3
7, 38, the SCR 18 of the voltage doubler capacitor 17 and the I.C. G. FIG. B. T. This is an example in which a discharge loop that forms a discharge loop through the circuit and a discharge circuit 36 that supplies a voltage generated during the formation of the discharge loop to the control electrode of the transistor 15 are connected to the voltage doubler capacitor 17 and the transistor 15. The discharge loop was formed at the time of the SC.
Since the operation of the R18 is controlled by the operation control circuit 20 which operates in response to the supply of the light emission start signal, it is needless to say that the point in time at which the R18 responds to the supply of the light emission start signal is reached.

The operation of the embodiment shown in FIG. 3 will be described below. As described above, the only difference from the previous embodiment is the operation control system of the transistor 15. It goes without saying that the operation of boosting the voltage between the main electrodes of the flash discharge tube 5 is the same as that of the previous embodiment. The drive control circuit 13
It is assumed that a circuit that responds to the DC high-voltage power supply 1 is employed.

When the DC high-voltage power supply 1 starts operating, the main capacitor 2, the doubler capacitor 17, and the like are charged to the polarity shown in FIG.
Starts operating, and I. G. FIG. B. T. Is turned on.

When a light emission start signal is supplied to the input terminal 20a of the operation control circuit 20 in a state where the capacitors 2 and the like have been charged, the operation control circuit 20 operates and turns on the SCR 18.

When the SCR 18 is turned on, the discharge of the trigger capacitor 33 is performed in the same manner as in the previous embodiment.
G. FIG. B. T. The flash discharge tube 5 is excited in a known manner, and a part of the oscillating voltage induced in the primary winding of the trigger transformer 34 is applied between the main electrodes of the flash discharge tube 5. .

At the same time, unlike the previous embodiment, the charge of the voltage doubler capacitor 17 is reduced by the SCR 18, I.I. G. FIG. B.
T. , And the voltage dropped on the resistor 37 forming the discharge circuit 36 is applied to the base, which is the control pole of the transistor 15, and the transistor 15 is turned on. In addition,
The transistor 15 is connected to the resistor due to the discharge of the voltage doubler capacitor 17.
The drop voltage of the anti-37 determines the ON state of the transistor 15.
Of course, when it becomes a value that can not be maintained, it will be turned off
It is.

When the transistor 15 is turned on, the charge voltage of the voltage doubler capacitor 17 becomes SCR1 as in the previous embodiment.
8, I. G. FIG. B. T. The voltage is applied between the main electrodes of the flash discharge tube 5 via the main capacitor 2 and the transistor 15.

Therefore, as in the previous embodiment, in addition to the charging voltage of the main capacitor 2, a part of the oscillation voltage and the doubler capacitor 17 are provided between the main electrodes of the flash discharge tube 5.
The flash discharge tube 5 starts the light emitting operation very easily, and emits light by consuming the charged charge of the main capacitor 2.

During the light emission of the flash discharge tube 5, the light emission stop signal is supplied to the drive control circuit 13 so that the I.I. G. FIG. B.
T. Is turned off, the main capacitor 2, the voltage doubler capacitor 17 and the trigger capacitor 33 as in the previous embodiment.
Is interrupted, so that the voltage doubler capacitor 17 and the trigger capacitor 33 are instantaneously charged via the flash discharge tube 5, the third diode 19 and the like.

As a result, I.I. G. FIG. B. T. A very short time after the OFF point of the above, the supply of the light emission stop signal to the drive control circuit 13 is stopped, and at the same time, the light emission start signal is supplied to the gate of the SCR 18;
The flash discharge tube 5 can always be excited, and the charging voltage of the voltage doubler capacitor 17 can be applied between the main electrodes thereof so as to be superimposed on the charging voltage of the main capacitor 2. The operation can be performed stably without causing light emission loss.

FIG. 4 is an electric circuit diagram showing still another embodiment of the strobe device according to the present invention. In the drawing, components having the same reference numerals as those in FIGS. 1 to 3 indicate the same components.

As is apparent from FIG. 4, in this embodiment, the pnp transistor 23 of the gate means 21 in the embodiment shown in FIG. 1 is replaced with an npn transistor 39. , The gate circuit 2
1 transistor 22 and resistors 24, 25, 27, 2
8 has been deleted. Further, the npn-type transistor 3
A resistor 40 is connected between the collector of the NPN transistor 9 and the reference power supply terminal 21a, and a resistor 41 is connected between the base of the npn transistor 39 and the low potential side terminal of the main capacitor 2.

Although not described in the embodiment shown in FIGS. 1 and 2, the reference power supply terminal 21a is, for example, a reference power supply battery which outputs an appropriate reference voltage as shown in FIG. Connected to the high potential side terminal of power supply 42.

The voltage to be supplied to the reference power supply terminal 21b basically needs only to bring the transistor 15 into a completely saturated state. Therefore, for example, when the withstand voltage of the transistor 39 is set to a high withstand voltage, 21
b may be connected to the high-potential side terminal of the main capacitor 2 that outputs a voltage value satisfying the above conditions, instead of the reference power supply 42, as shown by the broken line in the figure.

The operation of the embodiment shown in FIG. 4 will be described below. The difference from the previous embodiments is a current supply system to the base of the transistor 15 such as a change in the polarity of the transistor. The boosting operation between the main electrodes of the flash discharge tube 5 or the rapid charging operation of the voltage doubler capacitor 17 and the like when the flash discharge tube 5 is in the ionized state are the same as those in the previous embodiments and will not be described in detail.

When the DC high-voltage power supply 1 operates, the main capacitor 2, the doubler capacitor 17 and the like are charged to the polarity shown in the drawing, as in the previous embodiments.

When a light emission start signal is supplied to the operation control circuit 20 in a state where each of the capacitors has been charged,
The SCR 18 is turned on as in the previous embodiment. At this time, I.I. G. FIG. B. T. Are in a conductive preparation state by the operation of the drive control circuit 13.

When the SCR 18 is turned on, the anode thereof has a low potential, so that the trigger circuit 32 operates to excite the flash discharge tube 5 and to induce the trigger transformer 34 between its main electrodes as in the previous embodiment. A part of the oscillating voltage is applied.

At the same time, the charge of the voltage doubler capacitor 17 is changed to the SCR 18, I.I. G. FIG. B. T. , Resistor 41 and resistor 2
9, the base current of the npn transistor 39 flows, and the npn transistor 39 is turned on.

When the npn transistor 39 is turned on,
The output voltage of the reference power supply 42 connected to the reference power supply terminal 21b at the base of the transistor 15, for example, is npn.
The voltage is applied through the type transistor 39, and the transistor 15 is turned on. Note that the transistor 15 is
Flows through the resistors 41 and 29 due to the discharge of the capacitor 17
Current keeps the ON state of the npn-type transistor 39.
When the value becomes an unsupported value, the npn-type transistor
The transistor 39 is turned off and the above
Turns off because supply of output voltage from quasi power supply 42 is stopped
Of course.

When the transistor 15 is turned on, the charging voltage of the voltage doubler capacitor 17 becomes SCR1 as in the previous embodiment.
The voltage is applied between the main electrodes of the flash discharge tube 5 via 8 or the like.

Therefore, the flash discharge tube 5 easily starts the light emission operation from the time when the SCR 18 is turned on, and emits light by consuming the charge of the main capacitor 2.

The operation of the drive control circuit 13 receiving the supply of the light emission stop signal causes the I.I. G. FIG. B. T. When is turned off, the voltage doubler capacitor 17 and the trigger capacitor 33 are rapidly charged as in the previous embodiment, and the next light emission operation is prepared.

Therefore, the embodiment shown in FIG. 4 can be expected to have the same operation and effect as those of the previous embodiments.

Also, as compared with the embodiment shown in FIG. 3 in which the charge charged in the voltage doubler capacitor 17 is used for controlling the base current supply of the transistor 15 in the same manner as in this embodiment, the flash discharge tube 5 There is also an effect that the boosting operation between the main electrodes can be performed more advantageously.

In the case of the embodiment shown in FIG. 3, a current of the order of several milliamperes must be supplied from the voltage doubler capacitor 17 to the base of the transistor 15 through the resistor 38 in order to completely saturate the transistor 15. . Such energy consumption is equivalent to reducing the energy that can be supplied from the voltage doubler capacitor 17 to the flash discharge tube 5 when the transistor 15 is turned on.

On the other hand, in the embodiment shown in FIG. 4, the charging energy of the voltage doubler capacitor 17 is directly transferred to the transistor 1.
5 is not used to supply the base current.

That is, the supply of the base current to the transistor 15 is performed not by the voltage doubler capacitor 17 but by, for example, the reference power supply 42 connected to the reference power supply terminal 21b, as in the embodiments shown in FIGS. It is configured.

The charging energy of the voltage doubler capacitor 17 is
A part thereof is used to completely saturate the npn-type transistor 39 for controlling the base current supply timing from the reference power supply 42.

For the complete saturation of the npn-type transistor 39, the value of the current that needs to be supplied to the base of the npn-type transistor 39 may be a very small current of the order of several hundred μA. 17
There is almost no problem with applying the charging energy to the flash discharge tube 5.

In other words, in the embodiment shown in FIG. 4, the charging energy of the voltage doubler capacitor 17 can be more efficiently applied between the main electrodes of the flash discharge tube 5 than in the embodiment shown in FIG. As a result, when the charging voltage of the main capacitor 2 decreases, the flash discharge tube 5 can emit light even at a lower charging voltage of the main capacitor 2 as compared with the embodiment shown in FIG. .

The embodiment shown in FIG. 4 is similar to the embodiment shown in FIG.
It is also apparent from FIG. 4 that the embodiment shown in FIG. 2 has the effect of reducing the number of parts.

While the four embodiments of the strobe device according to the present invention have been described above, in any of the embodiments, the I.P. G. FIG. B. T. As a drive control circuit 13 which has adopted a circuit of a type for outputting an ON voltage, a circuit of a type similar to the conventional device shown in FIG. G. FIG. B. T. Is controlled to be in an off state, and operates only during the light emission operation to control the I.V. G. FIG. B. T. It is needless to say that a circuit of a type that outputs the ON voltage may be adopted.

However, when a drive control circuit of the type described above is employed, the SCR 18 or the transistor 15
At the time of transition to the ON state. G. FIG. B. T. Is sufficiently turned on, it is said that I. G. FIG. B. T. From the viewpoint of preventing the destruction of I.I.
G. FIG. B. T. The output timing of the ON voltage of the SCR
It is preferable to precede the output timing of the ON voltage such as 18.

[0100]

The flash device according to the present invention has a doubler capacitor capable of charging the flash discharge tube at the same time as the ionization of the flash discharge tube. G. FIG. B.
T. When the flash is turned on, the charging voltage of the doubler capacitor can be applied between the main electrodes of the flash discharge tube while being superimposed on the charging voltage of the main capacitor.
The above-described high-speed repetitive light-emitting operation can be realized without occurrence of light-emission, in other words, I.I. G. FIG. B. T. Has the effect that the flash discharge tube can emit light reliably following the high-period on / off operation.

Further, since a high voltage can be stably applied between the main electrodes of the flash discharge tube, it is possible to emit light reliably and stably even when the flash start voltage of the flash discharge tube is high.
It has the effect of adopting a flash discharge tube with a small size and high impedance, and as a result, it also has the effect of realizing a reduction in the size of the device and an increase in the amount of emitted light.

[Brief description of the drawings]

FIG. 1 is an electric circuit diagram showing an embodiment of a strobe device according to the present invention.

FIG. 2 is an electric circuit diagram showing another embodiment of the strobe device according to the present invention.

FIG. 3 is an electric circuit diagram showing still another embodiment of the strobe device according to the present invention.

FIG. 4 is an electric circuit diagram showing still another embodiment of the strobe device according to the present invention.

FIG. 5 is an electric circuit diagram showing an example of the device disclosed in Japanese Patent Application Laid-Open No. Sho 64-17033.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 DC high voltage power supply 2 Main capacitor 5 Flash discharge tube 10 1st series connection body 11 series body 12 1st diode 13 Drive control circuit 14 2nd series connection body 15 Transistor 16 2nd diode 17 Doubler capacitor 18 SCR 19 3rd diode Reference Signs List 20 operation control circuit 21 gate means 22 transistor 23 transistor 24 resistance 25 resistance 26 resistance 27 resistance 28 resistance 29 resistance 30 charging means 31 charging resistance 32 trigger circuit 33 trigger capacitor 34 trigger transformer 35 fourth diode 36 discharge circuit 37 resistance 38 resistance 39 npn transistor 40 resistor 41 resistor 42 reference power supply

Claims (5)

(57) [Claims] 1. A DC high-voltage power supply, a main capacitor connected to both ends of the DC high-voltage power supply, and both ends of the main capacitor.
The charge of the main capacitor can be discharged in the forward direction through the flash discharge tube, the first diode, and the insulated gate bipolar transistor in order from the high potential side of the main capacitor.
Wherein a first series connection which are connected in series, and a first control switch element and a second diode having a control electrode as the
A current flows from the first control switch element to the second diode.
A second series-connected body connected in a forward direction to both ends of a series body of the first diode and the insulated gate bipolar transistor, and one end connected to an anode of the second diode. A voltage doubler capacitor, a third diode having an anode connected to the cathode of the flash discharge tube, and a cathode connected to the other end of the voltage doubler capacitor; and a series body including the flash discharge tube and the third diode. Charging means for connecting the voltage doubler capacitor to both ends of the main capacitor through the second diode by being connected in parallel, and charging the voltage doubler capacitor so that the other end has a high potential; A second control switch element connected in a forward direction between the other end of the voltage doubler capacitor and the collector of the insulated gate bipolar transistor; An operation control circuit that outputs an on-voltage for turning on the second control switch element when a signal is supplied and supplies the ON voltage to a control pole of the second control switch element, and a supply of the light emission start signal to the operation control circuit Operating in response to the first control switch element, and a gate control means for outputting an ON voltage for turning on the first control switch element and supplying the ON voltage to a control pole of the first control switch element; The insulated gate bipolar transistor is connected to a control pole of the insulated gate bipolar transistor, and when at least the light emission start signal is supplied to the operation control circuit, an ON voltage is supplied to the control pole of the insulated gate bipolar transistor to cause the insulated gate bipolar transistor to operate. A drive control circuit to be turned on, the second control switch element and the insulated gate bipolar transistor, A trigger capacitor and a trigger transformer connected in parallel with a series body comprising: a series body comprising the second control switch element and the insulated gate bipolar transistor; and a discharge operation of the trigger capacitor via the trigger transformer. And a trigger circuit for exciting the flash discharge tube with a high voltage generated in the transformer. 2. The gate means of the switch control means includes a reference power supply terminal to which an appropriate reference power supply is applied, an input terminal to which a light emission start signal supplied to an operation control circuit is directly input, and the light emission to the input terminal. The reference power supply applied to the reference power supply terminal based on the supply of the start signal;
The strobe device according to claim 1, further comprising a switch circuit that supplies a control electrode of the control switch element as an ON voltage. 3. The gate means of the switch control means, wherein a reference power supply terminal to which an appropriate reference power supply is applied and a main pole are connected between the reference power supply terminal and a control pole of the first control switch element. A third control switch element connected via a fourth diode to a connection point between the voltage doubler capacitor and the second control switch element, wherein the third control is performed when the second control switch element is turned on by supplying a light emission start signal; 2. The flash device according to claim 1, wherein the switch element is turned on, and the reference power supply is applied as an on-voltage to a control pole of the first control switch element. 4. A DC high-voltage power supply, a main capacitor connected to both ends of the DC high-voltage power supply, and both of the main capacitor.
At the end, the charge of the main capacitor can be discharged in the forward direction through the flash discharge tube, the first diode, and the insulated gate bipolar transistor in order from the high potential side of the main capacitor.
A first series connection body formed by connected in series so that, the first control switch element and a second diode having a control electrode the
A current flows from the first control switch element to the second diode.
A second series connection is connected in series with both ends of a series body of the first diode and the insulated gate bipolar transistor, and one end is connected to an anode of the second diode. A voltage doubler capacitor, a third diode having an anode connected to the cathode of the flash discharge tube, and a cathode connected to the other end of the voltage doubler capacitor; and a series body including the flash discharge tube and the third diode. By being connected in parallel, the voltage-doubler capacitor is connected to both ends of the main capacitor via the second diode, and the voltage-doubler capacitor is connected to the cathode of the flash discharge tube via the third diode. A charging means for charging the terminal so as to have a high potential, and a control electrode, wherein the other end of the voltage doubler capacitor and the collector of the insulated gate bipolar transistor A second control switch element connected in a forward direction between the second control switch element and an ON voltage for turning on the second control switch element when a light emission start signal is supplied to the control electrode of the second control switch element. An operation control circuit for supplying and a plurality of resistors connected in series, a connection point of each other is connected to a control pole of the first control switch element, and the second control switch element and the Connected to each other through an insulated gate bipolar transistor to form a discharge loop through the second control switch element of the voltage doubler capacitor and the insulated gate bipolar transistor, and to form the discharge loop through the discharge loop. At the time of the discharging operation of the capacitor, a drop voltage generated at one of the plurality of resistors is supplied to the control electrode of the first control switch element as an ON signal. A switch control means including a discharge circuit for supplying an output signal, and an output terminal connected to a control electrode of the insulated gate bipolar transistor, wherein at least the light emission start signal is supplied to the operation control circuit. A drive control circuit for supplying an on-voltage to the control pole of the bipolar transistor to turn on the insulated gate bipolar transistor, and a trigger connected in parallel with a series body including the second control switch element and the insulated gate bipolar transistor A flash unit including a capacitor and a trigger transformer, a series body including the second control switch element and the insulated gate bipolar transistor, and a high voltage generated in the trigger transformer by a discharge operation of the trigger capacitor through the trigger transformer. Exciting the discharge tube A flash device comprising a trigger circuit. 5. The first control switch element has a first npn connected between a collector and an emitter across the first diode via a voltage doubler capacitor and a second control switch element.
The gate means of the switch control means has a reference power supply terminal to which an appropriate reference power supply is applied and an emitter connected to the base of the first npn-type transistor, and a collector connected to the base via a first resistor. A second npn transistor connected to a reference power supply terminal, a second resistor connected between the base of the second npn transistor and a low potential side terminal of the main capacitor, and the first npn transistor And a third resistor connected between the base and the emitter of the second control switch element and the insulated gate bipolar transistor in response to the supply of the light emission start signal. Discharge of the bias capacitor between the resistor and the base-emitter of the second npn transistor and via the third resistor By turning on and supplies the base current to the second npn transistors, the said reference power being applied to the reference power supply terminal first np
2. The strobe device according to claim 1, wherein a strobe signal is supplied as an ON signal to the base of the n-type transistor via the third resistor.