JP2584577Y2 - Strobe device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an insulated gate bipolar transistor that controls the light emitting operation of a flash discharge tube in series with the flash discharge 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. Sho 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; I. connected in series to the flash discharge tube 5 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. Is turned on, and the trigger circuit 4 also operates. As a result, the flash discharge tube 5 consumes the charge stored in the main capacitor 2 and emits 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]

[Problems to be solved by 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 by using a commutation capacitor, over-emission is eliminated, and high-speed repetitive light-emitting operation and downsizing of the device shape can be realized.

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 above-mentioned light emission omission.

On the other hand, in order to reduce the size of the flash discharge tube and increase the amount of emitted light, a method of increasing the internal gas pressure and increasing the impedance is well known. It is known that the starting voltage rises. In addition, considering the high-speed repetitive light emission operation, the heat radiation characteristic is deteriorated by miniaturization, and the heat accumulation characteristic is increased by increasing the impedance, and the light emission start voltage is further increased. In view of the above-mentioned situation, the fact that the operation of the voltage doubler circuit cannot be expected is disadvantageous to the light emission of the flash discharge tube.

The present invention has been made in consideration of the above-mentioned disadvantages, and has a high voltage generated in a secondary winding of a transformer operated at the time of a light emission start operation or another winding electromagnetically coupled with each winding of a trigger transformer. A voltage can be applied between the main electrodes of the flash discharge tube, that is, the voltage between the main electrodes of the flash discharge tube is boosted without using a voltage-doubler capacitor, and the next time during high-speed repetitive light emission operation of several tens of Hz or more, An object of the present invention is to provide a strobe device which can employ a flash discharge tube having a small size and a high impedance capable of reliably performing a light emitting operation.

[0017]

SUMMARY OF THE INVENTION A strobe device according to the present invention is a series body comprising a DC high-voltage power supply, main capacitors connected to both ends of the DC high-voltage power supply, a flash discharge tube and a secondary winding of a transformer. And I. G. FIG. B. T. And a series-connected body connected to both ends of the main capacitor, at least a trigger capacitor and a primary winding of the transformer, and charging of the trigger capacitor in response to supply of a light emission start signal. Or a starting circuit for performing a discharging operation, and a diode connected to both ends of the series body so that the anode is connected to the cathode side of the flash discharge tube,
The above I. G. FIG. B. T. Has an output terminal connected to the control electrode of I. G. FIG. B. T. And a drive control circuit for controlling the conduction and non-conduction operations of.

Another strobe device according to the present invention includes a DC high-voltage power supply, a main capacitor connected to both ends of the DC high-voltage power supply, and a series body including a flash discharge tube and another winding electromagnetically coupled to the trigger transformer. I. G. FIG. B. T. And a series-connected body connected to both ends of the main capacitor, including at least a trigger capacitor and a trigger transformer, and performing a charging or discharging operation of the trigger capacitor in response to supply of a light emission start signal. And a diode connected to both ends of the series body so that the anode is connected to the cathode side of the flash discharge tube; G. FIG. B. T. Has an output terminal connected to the control electrode of I. G. FIG. B. T. And a drive control circuit for controlling the conduction and non-conduction operations of.

[0019]

Since the strobe device according to the present invention is constructed as described above, the activation circuit operates by supplying the light emission start signal, and when the charging or discharging current of the trigger capacitor flows through the primary winding of the transformer, the strobe device of the transformer is activated. A high voltage is induced in the secondary winding according to the turns ratio with the primary winding and the charging voltage value of the main capacitor.

The induced voltage of the secondary winding is controlled by a diode connected to both ends of a series body composed of a flash discharge tube and a secondary winding of a transformer. The voltage applied between the main electrodes, and therefore, the voltage between the main electrodes of the flash discharge tube is controlled to a voltage value much higher than the charging voltage of the main capacitor despite the fact that a conventionally known voltage doubler capacitor is not used. Will be done.

As a result, at the time of the operation of the start-up circuit having the above-described operation, the I.D. G. FIG. B. T. Is turned on, the flash discharge tube easily starts its light emission operation, and emits light by consuming the charged charge of the main capacitor.

On the other hand, I.I. G. FIG.
B. T. Is turned off, the discharge loop of the main capacitor via the flash discharge tube is interrupted, and the light emission operation of the flash discharge tube stops. Also at this time, a high voltage is induced in the secondary winding, but this high voltage is released via a diode, and the I.V. G. FIG. B. T. Is not applied.

Further, since the other strobe device according to the present invention is configured as described above, when the trigger circuit operates by the supply of the light emission start signal, and the charging or discharging current of the trigger capacitor flows to the trigger transformer, the trigger circuit is activated. A high voltage is induced in the secondary winding and the other winding of the trigger transformer in accordance with the turns ratio with respect to the primary winding of the trigger transformer and the charging voltage value of the main capacitor, respectively.

Therefore, the flash discharge tube is excited by the high voltage induced in the secondary winding of the trigger transformer, and the high voltage induced in the other winding is applied between the main electrodes thereof via the diode. Will be.

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

On the other hand, I. G. FIG. B. T. Is turned off, the discharge loop through the flash discharge tube of the main capacitor is interrupted, and the light emission operation of the flash discharge tube stops. At this time, a high voltage is induced in the separate winding, but the high voltage is released via a diode, and the high voltage is released. G. FIG. B. T. Is not applied.

[0027]

FIG. 1 is an electric circuit diagram showing an embodiment of a strobe device according to the present invention. In FIG. 1, 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 condenser 2.
And a series body 11 comprising a secondary winding 12 of a transformer T and I.I. G. FIG. B. T. Are connected in series.

At both ends of the series body 11, a parallel body 13 comprising a trigger capacitor 14 and a resistor 15 and a primary winding 17 of a transformer T are connected in series. G. FIG. B. T. And a diode 18 so that the anode thereof is connected to the cathode side of the flash discharge tube 5 in cooperation with the series connection body 16 forming a start-up circuit.

I. G. FIG. B. T. The gate of this I.D.
G. FIG. B. T. Is connected to the output terminal 19b of the drive control circuit 19 for controlling the conduction and non-conduction operations of the drive control circuit 19. For example, a light emission start signal and a light emission stop signal are supplied to an input terminal 19a of the drive control circuit 19.

Hereinafter, the operation of the embodiment of the strobe device according to the present invention shown in FIG. 1 will be described in detail.

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 high DC voltage output between its output terminals. Will be

At an appropriate point in time when the main capacitor 2 is charged, a light emission start signal is output from the drive control circuit 1.
9 is supplied to the input terminal 19a, the drive control circuit 19 operates. G. FIG. B.
T. Is output, so that at this point, I.V. G. FIG. B. T. Turns on.

I. G. FIG. B. T. Is turned on, this I.
G. FIG. B. T. The charging of the trigger capacitor 14 constituting the second series connection body 16 forming a start-up circuit in cooperation with the primary winding 17 of the transformer T and the above I.I. G. FIG. B.
T. That is, the starting circuit operates in response to the supply of the light emission start signal, and as a result, a high voltage including the voltage having the polarity shown is induced in the secondary winding 12 of the transformer T. Will be.

The high voltage induced in the secondary winding 12 is applied between the main electrodes of the flash discharge tube 5 via the diode 18, as is apparent from the drawing.

Therefore, the voltage between the main electrodes of the flash discharge tube 5 is raised to a voltage higher than the charging voltage of the main capacitor 2 by the voltage having the polarity shown in the drawing, which is a part of the oscillating voltage induced in the secondary winding 12. As a result, the flash discharge tube 5 easily starts the light emitting operation, that is, the I.D. G. FIG.
B. T. From the ON point of time, the charge of the main capacitor 2 is consumed to emit light. The application of the oscillating voltage to the flash discharge tube 5 at a polarity opposite to that shown in the figure does not cause any particular problem because the amount of energy is significantly smaller than that of the main capacitor 2.

When a light emission stop signal is supplied to the input terminal 19a of the drive control circuit 19 at an appropriate point in time when the flash discharge tube 5 emits light, the drive control circuit 19 sets the I.D. G. FIG. B. T.
Will be turned off.

I. G. FIG. B. T. Is turned off, the discharging loop of the main capacitor 2 and the charging loop of the trigger capacitor 14 are cut off, and thus the secondary winding 1 of the transformer T is turned off.
The energy stored in 2 causes a voltage of the illustrated polarity to be generated, and the charge of the trigger capacitor 14 is released via the resistor 15.

The energy stored in the secondary winding 12 is emitted through the diode 18, as is apparent from the drawing, and the I.D. G. FIG. B. T. Is not applied. That is, the diode 18
It also functions to release the energy, and as a result, the I.D. G. FIG. B. T. Is not destroyed, and the flash discharge tube 5 returns to the initial state through an ionized state longer than usual by the amount of the above-mentioned energy release.

It should be noted that I. G. FIG. B. T. Is controlled by the supply period of the light emission stop signal supplied to the drive control circuit 19, or by the operation of the drive control circuit 19 itself, and considering the light emission form of the flash discharge tube 5. However, in this embodiment, the supply period of the light emission stop signal itself is set to I.D. G. FIG. B. T. Off period.

Next, when the supply of the light emission stop signal to the drive control circuit 19 is stopped to perform the next light emission and the light emission start signal is supplied again to the input terminal 19a, the drive control circuit 19 operates and the I.D. G. FIG. B. T. Turns on again.

I. G. FIG. B. T. Is turned on, a high voltage induced in the secondary winding 12 of the transformer T is applied between the main electrodes of the flash discharge tube 5 as in the previous case, and as a result, the flash discharge tube 5 becomes extremely easy. To start emitting light at
Light is emitted by consuming the charge of the main capacitor 2.

Now, when looking at the charging operation of the trigger capacitor 14 in the above embodiment, it goes without saying that the operation cannot be performed unless it is in the uncharged state.

That is, the charging operation after emitting light once is as follows.
It goes without saying that the operation cannot be performed unless the discharging operation via the resistor 15 of the charge stored by the charging operation performed for the previous light emission is completed.

Therefore, in the embodiment shown in FIG. 1, it is necessary to previously set the discharge time constant of the resistor 15 and the trigger capacitor 14 to a value in consideration of the frequency of the light emission operation to be obtained. .

In other words, by appropriately setting the time constant in consideration of the highest frequency of the light emitting operation to be performed, the charging operation can be stably performed. An appropriate time constant is selected in consideration of the above.

With this selection, the state of generation of the induced voltage in the secondary winding 12 and the state of application to the flash discharge tube 5 can be managed in an extremely stable state. G. FIG.
B. T. Thus, the high voltage induced in the secondary winding 12 can be always applied to the flash discharge tube 5 when the flash lamp is turned on.

Thereafter, after an appropriate high-speed repetitive light-emitting operation is performed, a light-emission stop signal is supplied for a period in consideration of the time required for the flash discharge tube 5 to return to the initial state through an ionization state longer than usual. By completely returning the flash discharge tube 5 to the initial state, the strobe device of the present embodiment returns to the state before the start of the light emitting operation.

FIG. 2 is an electric circuit diagram showing another embodiment of the 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 apparent from FIG. 2, this embodiment is different from the embodiment shown in FIG. 1 in that the switching element is connected in series with the primary winding 17 of the transformer T forming a part of the charging loop of the trigger capacitor 14. This is an example in which the SCR 20 is connected and a light emission control circuit 21 that operates to turn on the SCR 20 is connected. That is, I.
G. FIG. B. T. This is an example in which an SCR 20 is added in the second series-connected body 16 forming a start-up circuit in cooperation with the SCR 20.

With the connection of the SCR 20, the I.C. G. FIG. B. T. And the charging operation of the trigger capacitor 14 can be controlled independently.

For this reason, as the drive control circuit 19, for example, I.D. G. FIG. B. T. Is turned on in response to the operation of the DC high-voltage power supply 1 and turned off by the supply of the light emission stop signal, that is, I.I. G. FIG.
B. T. Can be adopted.

The operation of the embodiment shown in FIG. 2 will be described below. It is assumed that the drive control circuit 19 employs a circuit that responds to the DC high-voltage power supply 1.

When the DC high-voltage power supply 1 starts operating, as in the previous embodiment, the main capacitor 2 is charged to the polarity shown, and the drive control circuit 19 starts operating.
G. FIG. B. T. Is turned on.

When a light emission start signal is supplied from the light emission control circuit 21 to the gate 20a of the SCR 20 in a state where the main capacitor 2 is charged as described above, this S
The CR 20 is turned on.

When the SCR 20 is turned on, I.D. G. FIG. B.
T. Series connection 1 forming a start-up circuit in cooperation with
6 is charged by the primary winding 17 of the transformer T, the SCR 20, and the I.D. G. FIG.
B. T. Started through. That is, the starting circuit operates in response to the supply of the light emission start signal, and as a result, a high voltage including the voltage having the illustrated polarity is induced in the secondary winding 12 of the transformer T.

The high voltage induced in the secondary winding 12 is applied between the main electrodes of the flash discharge tube 5 via the diode 18 in the same manner as in the previous embodiment. The voltage is boosted to a voltage higher than the charging voltage of the main capacitor 2. As a result, 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, a light emission stop signal is supplied to the input terminal 19a of the drive control circuit 19 and the I.S. G. FIG. B. T. Is turned off, the discharge loop of the main capacitor 2 and the charge loop of the trigger capacitor 14 are cut off, as in the previous embodiment, so that the flash discharge tube 5 stops emitting light and returns to the initial state. Turn off.

The return to the initial state is achieved by releasing the energy stored in the secondary winding 12 of the transformer T through the diode 18 when the discharge loop is interrupted, thereby causing the ionization state to be longer than usual. What is done via this is the same as in the previous embodiment. That is, the diode 18 also has the function of releasing the energy, and the emission based on the function allows the diode 18 to emit the energy. G. FIG. B. T. Is prevented in the same manner as in the previous embodiment.

At the same time, the charge of the trigger capacitor 14 is also discharged via the resistor 15, thereby preparing for the next light emission start operation.
By appropriately setting the time constants of the resistor 4 and the resistor 15 in consideration of the frequency to emit light, a high-speed repetitive light emission operation can be performed stably without causing light emission omission as in the previous embodiment. It is.

In the next light emission, the supply of the light emission stop signal to the drive control circuit 19 is stopped, and the light emission start signal is again supplied to the gate 20a of the SCR 20. G. FIG. B.
T. And turning on the SCR 20.

Thereafter, as in the previous embodiment, after performing a suitable high-speed repetitive light emission operation, a light emission stop signal is supplied for a period in consideration of the time required for the flash discharge tube 5 to return to the initial state. Completely return to the initial state; G. FIG.
B. T. Is turned on again, the flash device of the present embodiment returns to the state before the start of the light emitting operation.

As described above, the embodiment shown in FIG. 2 is different from the embodiment shown in FIG. G. FIG. B. T. And the charging operation of the trigger capacitor 14 can be controlled independently.

Therefore, as described above, the I.D. G. FIG. B. T. Can be considered and realized before the light emission start signal is supplied to the SCR 20.
G. FIG. B. T. Is not sufficiently turned on, the charging operation of the trigger capacitor 14 and the accompanying voltage application operation to the flash discharge tube 5 are performed, and the large current from the main capacitor 2 is not fully turned on. G. FIG. B. T. Does not flow through the I.D. G. FIG. B. T. Can be reliably prevented, and the inconvenience of deteriorating the high voltage application efficiency can be reliably prevented.

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

As is apparent from FIG. 3, this embodiment replaces the transformer T in the embodiment shown in FIGS. 1 and 2 and replaces the primary winding 22a and the secondary winding 22 in series with the parallel body 13.
b, and a primary winding 22a and a primary winding 22a forming the trigger transformer 22.
And another winding 23 electromagnetically coupled with the secondary winding 22b and the flash discharge tube 5 and the I.D. G. FIG. B. T. This is an example in which the connection is made in series between the two. That is, I. G. FIG. B. T. A well-known trigger circuit is formed by the series connection body 16 and the series connection body 1 at the same time.
6, a separate winding 23 electromagnetically coupled to a trigger transformer 22 forming a part of the flash discharge tube 6 is connected in series with the flash discharge tube 5.

The operation of the embodiment shown in FIG. 3 will be described below. However, only the operation of exciting the flash discharge tube 5 by a well-known trigger circuit is added, and the other operations are the same as those of the embodiment shown in FIG. Will be performed.

That is, while the main capacitor 2 is being charged, the operation of the drive control circuit 19 by the supply of the light emission start signal causes the I.V. G. FIG. B. T. Is turned on, the trigger capacitor 14 which forms part of the series connection 16
Are charged by the primary winding 22a of the trigger transformer 22 and the I.I. G. FIG. B. T. And thus the trigger transformer 2 electromagnetically coupled to the primary winding 22a
A high voltage is induced in the second secondary winding 22b and the other winding 23.

In other words, the series connection 16 and the I.D. G. FIG.
B. T. The high voltage induced in the secondary winding 22b is applied to the flash discharge tube 5 through the well-known trigger electrode 24 made of, for example, a transparent conductive film. The high voltage induced in the other winding 23 is applied between the main electrodes of the flash discharge tube 5 via the diode 18.

Accordingly, the flash discharge tube 5 is excited as is well known, and the voltage between its main electrodes is controlled to a high voltage as in the embodiment described above.

As a result, the flash discharge tube 5 starts the light emission operation very easily, and emits light by consuming the charge of the main capacitor 2.

On the other hand, the operation of the drive control circuit 19 by the supply of the light emission stop signal causes the I.D. G. FIG. B. T. Is off,
As in the embodiment described with reference to FIG. 1, the discharge loop of the main capacitor 2 through the flash discharge tube 5 and the trigger capacitor 1
4, the charging loop through the primary winding 22a is interrupted,
The light emission operation of the flash discharge tube 5 stops. At this time, the high voltage induced in the separate winding 23 is released via the diode 18 and the I.V. G. FIG. B. T. In addition, the embodiment described with reference to FIG. 1 also shows that the charge of the trigger capacitor 14 is discharged through the resistor 15 connected in parallel, and the next light emission start operation can be performed. Is the same as

As described above, the embodiment shown in FIG. 3 is similar to the previous embodiment in that the flash discharge tube 5 is used at the start of the light emission operation.
The voltage applied between the main electrodes is increased, and the flash discharge tube 5 is excited by a well-known trigger circuit. Therefore, the flash discharge tube 5 is controlled to emit light more easily.

As shown by the broken line in FIG. 3, a trigger switch element is connected in series with the primary winding 22a of the trigger transformer 22, and G. FIG. B. T. It is needless to say that the turning-on operation and the charging operation of the trigger capacitor 14 may be controlled independently.

FIGS. 4A and 4B are electric circuit diagrams showing still another embodiment of the strobe device according to the present invention.
In the figure, elements having the same reference numerals as those in the embodiment of FIG. 1 indicate the same functional elements.

The embodiment shown in FIG.
Is connected to a series body 25 comprising a charging resistor 26 and a primary winding 17 of a transformer. G. FIG. B. T. Trigger capacitor 14 is connected between the emitters.

In the embodiment shown in FIG. 4B, a series body 2 is formed by connecting a charging resistor 26, a trigger capacitor 14 and a primary winding 17 of a transformer in series at both ends of a main capacitor 2.
7 is connected, and the high potential side of the trigger capacitor 14 and the I.I. G. FIG. B. T. Feeder 2 between the collector
8 are connected.

The operation of the embodiment shown in FIGS. 4A and 4B will be described below. In each of the embodiments shown in FIGS. 4A and 4B, the trigger capacitor 14 is connected to both ends of the main capacitor 2 via the charging resistor 26 or the charging resistor 26 and the primary winding 17 of the transformer T. Therefore, when the DC high-voltage power supply 1 starts operating, it is charged simultaneously with the main capacitor 2.

In the state where the main capacitor 2 and the trigger capacitor 14 are charged, I.D. G. FIG. B. T.
Is turned on, in both embodiments, the charge on the trigger capacitor 14 is reduced by the primary winding 17 of the transformer T and I.I. G. FIG.
B. T. , And a high voltage is induced in the secondary winding 12 of the transformer T at this time.

The induced voltage of the secondary winding 12 is applied between the main electrodes of the flash discharge tube 5 via the diode 18 in both embodiments. As a result, the flash discharge tube 5 easily starts the light emission operation. Thus, light is emitted by consuming the charge of the main capacitor.

Hereinafter, I. G. FIG. B. T. Is turned off,
The discharge loop of the main capacitor 2 and the trigger capacitor 14 is cut off, the flash discharge tube 5 stops emitting light, and at the same time, the trigger capacitor 14 is charged in preparation for the next light emission. At this time, the high voltage induced in the secondary winding 12 is discharged through the diode 18 and the high voltage is applied to the I.D. G. FIG.
B. T. Is not applied as in the above-described embodiments.

Therefore, the trigger capacitor 14
Is set in advance in consideration of the maximum cycle at which light emission is desired, so that the next time the light emission operation is performed, the secondary winding 12 of the transformer T described above is used, as in the above-described embodiments. The effect of applying the induced high voltage can be expected stably.

As is clear from the operation described above, the embodiment shown in FIGS. 4A and 4B is different from the embodiment shown in FIG. This is an example in which the operation of FIG.

As shown by broken lines in FIGS. 4A and 4B, by connecting the SCR 20 as a trigger switch element in series with the primary winding 17 of the transformer T or in the power supply path 28. It is also apparent that the operation of the starting circuit performed by the charging operation of the trigger capacitor 14 in the embodiment shown in FIG. 2 can be realized by the discharging operation of the trigger capacitor 14.

Although not shown, the trigger capacitor 1 in the trigger circuit of the embodiment shown in FIG.
The operation by the charging operation of FIG. 4 also takes into account the development described above, that is, the development of the embodiment shown in FIGS. 4A and 4B with respect to the embodiment shown in FIG. Needless to say, it can be changed so as to obtain.

[0087]

The flash device according to the present invention is electromagnetically coupled to a primary winding of a transformer or each winding of a trigger transformer connected to a charging or discharging loop of a trigger capacitor formed at the time of a light emission start operation, and a flash discharge tube. And the secondary winding or another winding connected in series with the flash capacitor, the high voltage induced in the secondary winding or another winding due to the charging or discharging operation of the trigger capacitor is applied to the main part of the flash discharge tube. It is possible to stably apply the voltage between the electrodes without using a voltage doubler capacitor. As a result, a high-speed repetitive light emission operation of several tens of Hz or more can be realized without light emission omission. G. FIG. B.
T. Has the effect that the flash discharge tube can emit light reliably following the high-period on / off operation.

[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.

4A is an electric circuit diagram showing still another embodiment of the strobe device according to the present invention; FIG. 4B 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 Series connection 11 Series 12 Secondary winding 13 Parallel 14 Trigger capacitor 15 Resistance 16 Series connection 17 Primary winding 18 Diode 19 Drive control circuit 20 SCR 21 Light emission control Circuit 22 Trigger transformer 23 Separate winding 24 Trigger electrode 25 Series body 26 Charging resistor 27 Series body 28 Feeding path

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H05B 41/30-41/34 G03B 15/05

Claims (10)

(57) [Scope of request for utility model registration] 1. A DC high-voltage power supply, a main capacitor connected to both ends of the DC high-voltage power supply, a series body composed of a flash discharge tube and a secondary winding of a transformer, and an insulated gate bipolar transistor connected in series. becomes a series connection which is connected to both ends of said main capacitor, a starting circuit for at least comprises a trigger capacitor and the primary winding of the transformer, to charge or discharge operation of the trigger capacitor during light emission start operation, a node A diode connected to both ends of the series body so as to be connected to a cathode side of the flash discharge tube, and an output terminal connected to a control electrode of the insulated gate bipolar transistor, wherein the insulated gate bipolar transistor A drive control circuit for controlling the conduction and non-conduction operations of the transistor, wherein the voltage induced in the secondary winding is controlled by the die. A strobe device for applying voltage between main electrodes of the flash discharge tube via an anode. The starting circuit includes a series connection formed by connecting a parallel body comprising a trigger capacitor and a resistor and a primary winding of a transformer in series, the series connection comprising a flash discharge tube and a transformer. 2. The strobe device according to claim 1, wherein the strobe device is connected to both ends of a series body including a next winding and performs a charging operation of the trigger capacitor when the insulated gate bipolar transistor is turned on. 3. The starting circuit includes a parallel connection comprising a trigger capacitor and a resistor, a series connection comprising a primary winding of a transformer and a trigger switch element connected in series, wherein the series connection comprises a flash discharge tube. 2. The strobe device according to claim 1, wherein the strobe device is connected to both ends of a series body composed of a transformer and a secondary winding of the transformer, and performs a charging operation of the trigger capacitor when both the trigger switch element and the insulated gate bipolar transistor are turned on. 4. A starting circuit comprising a series connection of a charging resistor and a primary winding of a transformer, and a series connection body connected to both ends of a series body comprising a flash discharge tube and a secondary winding of the transformer. A trigger capacitor connected between a connection point of the charging resistor and the primary winding of the transformer and an emitter of the insulated gate bipolar transistor, and performs a discharging operation of the trigger capacitor when the insulated gate bipolar transistor is turned on. The strobe device according to claim 1. 5. The strobe device according to claim 4, wherein a primary winding of the transformer is connected to both ends of a series body including a flash discharge tube and a secondary winding of the transformer via a trigger switch element. 6. A starting circuit comprising: a charging resistor, a trigger capacitor, and a primary winding of a transformer connected in series; a series connection body connected to both ends of a main capacitor; a high-potential terminal of the trigger capacitor; And a power supply path connecting between the collectors of the insulated gate bipolar transistors,
2. The flash device according to claim 1, wherein a discharge operation of the trigger capacitor is performed when the insulated gate bipolar transistor is turned on. 7. The strobe device according to claim 6, wherein the power supply path includes a trigger switch element. 8. A DC high-voltage power supply, a main capacitor connected to both ends of the DC high-voltage power supply, and a trigger transformer.
Separate windings electromagnetically coupled to primary and secondary windings
And a flash discharge tube, and a series connection of an insulated gate bipolar transistor and a first series connection connected to both ends of the main capacitor, and at least a trigger capacitor and the trigger transformer. a trigger circuit in response to the supply of the light emission start signal for exciting the flash discharge tube was charged or discharging operation of the trigger capacitor, the series connection body as a node is connected to the cathode of the flash discharge tube And a drive control circuit having an output terminal connected to a control pole of the insulated gate bipolar transistor and controlling conduction and non-conduction operations of the insulated gate bipolar transistor. A strobe for applying a voltage induced in the separate winding to both ends of the flash discharge tube via the diode. Apparatus. 9. The trigger circuit includes a series connection body in which a parallel body including a trigger capacitor and a resistor and a trigger transformer are connected in series, wherein the series connection body includes a flash discharge tube and a separate winding. 9. The strobe device according to claim 8, wherein the strobe device is connected to both ends of the body and charges the trigger capacitor when the insulated gate bipolar transistor is turned on. 10. The trigger circuit includes a parallel body comprising a trigger capacitor and a resistor, and a series connection body formed by connecting a trigger transformer and a trigger switch element in series, wherein the series connection body comprises a flash discharge tube and a separate winding. 9. The flash device according to claim 8, wherein the strobe device is connected to both ends of a series body composed of: and performs a charging operation of the trigger capacitor when both the trigger switch element and the insulated gate bipolar transistor are turned on.