JPS63129327A - Strobe lighting device for photography - Google Patents

Abstract

PURPOSE:To reduce the cost of an electronic flash by placing a 1st control switch means in an operation state through the light emitting operation of a flash discharge tube, receiving a light emission stop signal and stopping the operation of the 1st control switch means, and then turning on a 2nd transistor (TR) and turning off a switch element. CONSTITUTION:A 1st TR 6 connected to the flash discharge tube 5 turns on when applied with a low source voltage through a 2nd TR 10 and a parallel body 12 by the one operation of the 2nd TR 10 and the off operation of the switch element 11 by the operation of the 1st control switch means 24 based upon a trigger signal, and the on state of the TR 6 is maintained throughout the light emission operation of the flash discharge tube 5. Further, the TR 6 receives the light emission stop signal to stop the operation of the control switch means 24 and while the supply of the low source voltage is stopped through the operation of a 2nd control switch means 25, a reverse bias by charging the charges of the capacitor C of the parallel body is applied through the switch element 11, so that the TR 6 turns off in a short time. Thus, the cost is reduced.

Description

Detailed Description of the Invention The industrial application field AA relates to a photographic strobe device in which a transistor is connected in series with a flash discharge tube as a light emission control element, and in particular to a photographic strobe device having features in the operation control system of the transistor. This invention relates to a strobe device.

2. Description of the Related Art A photographic strobe device in which a flash discharge tube and a transistor as a light emission control element are connected in series is known from, for example, Japanese Utility Model Publication No. 43-21344.

However, the conventional device described above has a structure in which the base current of the transistor connected in series with the flash discharge tube is constantly supplied, so it has the problem that power consumption increases for operations other than the main operation, which is light emission. are doing.

That is, due to the base current supply itself or the above structure, it becomes necessary to continue the non-conducting operation of the transistor until the flash discharge tube is completely extinguished, and as a result, the non-conducting operation causes uneven flash. Considering the characteristics of the discharge tube, this must be done for a relatively long time, and the required power consumption increases.

Therefore, the applicant of this application first filed the patent application No. 60-215439.
No. 2, they proposed a photographic strobe device that could improve the problems of the conventional devices mentioned above.

The photographic strobe device proposed in this proposal has a basic configuration as shown in FIG. 6, and its operation will be briefly described as follows.

When the power switch 2 is closed, the well-known DC-DC converter circuit 3 boosts the terminal voltage of the low-voltage battery 1, which is a low-voltage power source, and the main capacitor 4. The trigger capacitor Gr of the well-known trigger circuit 7 for exciting the flash discharge tube 6 is charged. At the same time, the output of the control means 8 is transmitted to the transistor 10.
is set to steady state to keep it off. Incidentally, the setting of the steady state may be performed when charging of the main capacitor 4 and the like is completed.

When the synchronizer switch S is closed with the main capacitor 4 etc. fully charged, the flash discharge tube 6 is excited and the synchronizer switch S1 is closed, causing the control means 8 to shift from a steady state to an output state in which the transistor 10 is turned on. Note that at this time, the transistor Tr, which is the switching element 11, is kept off.

When transistor 8 is turned on, this transistor 8. The base current of the transistor e is supplied through the parallel body 12 consisting of the capacitor C and the current limiting resistor R, and as a result, the flash discharge tube 5 emits light. At this time, the supply of the base current rises sharply by the parallel body 12 and is controlled to a value determined by the resistor H after charging of the capacitor C is completed.

On the other hand, when the amount of light emitted from the flash discharge tube 6 reaches the desired amount,
The light emission stop signal generating means 9 operates and supplies a light emission stop signal to the control means 8.

Upon receiving the light emission stop signal, the control means 8 returns to the steady state again, and the transistor 1o is turned off. still,
In this case, the transistor Tr, which is the switching element 11, is turned on due to the charge charged in the capacitor C of the parallel body 12.

Therefore, the base current of the transistor 6 is cut off by turning off the transistor 10, and at the same time, the transistor 6 is reverse-biased by the voltage drop caused by the discharge through the resistor R of the capacitor C, so that the transistor 6 is turned off instantly and reliably. At this point, the flash discharge tube 6 also stops emitting light.

The above operation is the operation of the photographic strobe device proposed earlier. The transistor connected in series with the flash discharge tube conducts based on the operation of the trigger circuit, and the base current is cut off based on the output of the light emission stop signal. It becomes non-conductive due to the bias, that is, it operates only when necessary, and therefore, compared to conventional devices, power consumption in operations other than the main operation, ie, the light emitting operation, can be reduced.

Problems to be Solved by the Invention As mentioned above, the previously proposed device has the effect of improving the problems of the conventional device, but on the other hand, when considering the signal output from the control means 8, it is clear that a high-level signal that keeps the transistor 10 off in response to a light emission stop signal, a low-level signal that keeps the transistor 10 on in synchronization with the operation of the trigger circuit, and a high-level signal that returns to a steady state and keeps the transistor 10 off in response to the light emission stop signal. It outputs a level signal, and this signal is of course a pulse signal output.

For this reason, when considering practical use, a pulse generation circuit for forming a pulse signal at the above-mentioned timing is specially required as the control means, resulting in an increase in the cost of the control means 8. It turns out.

The present invention has been made in consideration of the above points, and it is an object of the present invention to provide a photographic strobe device in which the control means is constructed using a circuit configuration that a conventional strobe device has, thereby reducing costs. With the goal.

Means for solving the opening point The photographic strobe device according to the present invention includes a first series body consisting of a flash discharge tube and a first transistor connected to both ends of a main capacitor charged by a DC high voltage power supply;
a second series body consisting of a parallel body of a second transistor, a current control element, and a capacitor, and connected to both ends of the low voltage power supply via the base-emitter of the first transistor; a switch element connected between the base and emitter of the camera via the parallel body; and a trigger circuit that operates in response to a trigger signal, which is a pulse signal formed by opening a synchro switch of the camera, to excite the flash discharge tube. , a light emission stop signal generation circuit that detects the point in time when a desired amount of light is emitted from the flash discharge tube and outputs a light emission stop signal for the flash discharge tube; and a light emission stop signal generation circuit that operates upon receiving the trigger signal to turn on the second transistor. and a first control switch means for controlling the switch element to an OFF state, and detecting light emission of the flash discharge tube and outputting a predetermined voltage, and supplying the predetermined voltage output to the first control switch means. a voltage generation circuit that maintains the first control switch means in an operating state while the flash discharge tube is emitting light; and a voltage generation circuit that operates upon receiving a light emission stop signal from the light emission stop signal generation circuit to operate the first control switch means. and second control switch means for stopping the second transistor, turning off the second transistor, and turning on the switch element.

Operation Since the photographic strobe device according to the present invention has the above-mentioned configuration, the first transistor connected in series with the flash discharge tube is activated by the operation of the first control switch means based on the trigger signal. By turning on the transistor and turning off the switch element, the low voltage power supply is turned on to the second
is turned on by being supplied through a transistor and a parallel circuit, and the on state is maintained during the light emitting operation of the flash discharge tube by maintaining the operating state of the first control switch means by a voltage generating circuit. Ru.

Further, the first transistor is operated upon receiving the light emission stop signal, and the second control switch means is operated to stop the operation of the first control switch means, turn off the second transistor, and turn on the switch element. Therefore, at the same time as the supply of the low-voltage power supply is stopped, a reverse bias is applied via the switch element by the charge charged in the capacitor of the parallel body, so that the off-operation can be performed reliably and in a short time.

Embodiment FIG. 1 is an electrical circuit diagram showing an embodiment of a photographic strobe device according to the present invention. In the figure, the same reference numerals as in FIG. 6 indicate the same structure.

As is clear from FIG. 1, the transistor Tr is used as the switch element 11 in this embodiment as well, as in the proposed device shown in FIG.

In the figure, the trigger circuit 13 is, for example,
When a trigger signal, which is a pulse signal disclosed in Publication No. 1, etc., is supplied from the input terminal 14, the flash discharge tube 6
The voltage generation circuit 15 turns on the transistor 17 by discharging the charge of the capacitor 16 which has been charged in advance before emitting light as the flash discharge tube 6 emits light, and causes the Zener diode 18 to This circuit outputs the charging voltage of the capacitor 19, which has been charged in advance to a regulated predetermined value, to the output terminal 20 and supplies it to the light emission stop signal generation circuit 9, for example.

The dividing means 21 is connected to the output terminal 20 of the voltage generating circuit 15.
This is means for dividing a predetermined voltage output to the two.

The transistors 22 and 23 keep the transistor 10 on and the switch element 11 off when turned on, respectively, and turn off the transistor 10 and keep the switch element 11 in an electrically floating state, that is, in a state where it can be turned on. It constitutes a first side hearing switch means 24 that controls the amount of sound. Note that the bases of the transistors 22 and 23 are connected to the input terminal 14 and the dividing means 21.

The transistor 26 forms a second split-plane switch means 25 that, when turned on, short-circuits the base and emitter of the transistors 22 and 23, turning both transistors 22 and 23 off. As shown by the broken line inside, a diode may be connected between the input terminal 14 and the bases of the transistors 22 and 23 as necessary, and the dividing means 21 is connected to the voltage value output from the voltage generating circuit 16. Needless to say, it can be omitted in some cases.

Now, in FIG. 1, when the power switch 2 is closed, the DC-DCC comparator circuit 3 boosts the terminal voltage of the low voltage battery 1, which is the low voltage power source, and the main capacitor 4. The capacitors 16 and 19 of the voltage generating circuit 16 are charged.

At this time, the output terminal 2o of the voltage generating circuit 16 is at a low level, the trigger signal is not input to the input terminal 14, and the transistor 22 is off, so the transistor 1
0 remains off, transistor 7 is never turned on, and of course transistor 23 . The transistor 'rr, which is the switching element 11, is also off.

When a trigger signal is supplied with the main capacitor 4 etc. fully charged, the trigger circuit 13 operates and the transistors 22 and 23 are turned on momentarily, turning on the transistor 1o and turning off the transistor Tr. Therefore, similar to the device described in FIG. 6, the base current of the transistor 6 is supplied through the parallel body 12, turning on the transistor 6, and as a result, the flash discharge tube 6 emits light.

When the flash discharge tube 6 emits light, the voltage generating circuit 16 operates as described above to generate a predetermined voltage at its output terminal 2°, and supplies it to the light emission stop signal generating circuit 9 and the dividing means 21.

The predetermined voltage supplied to the dividing means 21 is divided as appropriate and supplied between the base and emitter of each of the transistors 22 and 23, so that the on state of both transistors turned on by the trigger signal is maintained even after the trigger signal disappears. do.

Therefore, the transistor 1o remains on, and therefore the transistor 6 also remains on, and the flash discharge tube 6 continues to emit light.

When the light emission stop signal generating circuit 9 operates during light emission and a light emission stop signal is output from its output/terminal, the transistor 26 is turned on and the base and emitter of the transistors 22 and 23 are shorted, and both transistors 22. Turn off 23.

Therefore, the transistor 10 is turned off and the parallel body 1
The transistor Tr is turned on by the charge in the capacitor C of No. 2, and the base current of the transistor 6 is cut off and reverse biased, similar to the device shown in FIG. The discharge tube 6 will stop emitting light.

The above operation is the operation of the photographic strobe device according to the present invention shown in FIG. 1, and as is clear from the above explanation, once the transistor 1o is turned on in response to the trigger signal, the The on state is maintained by the output of the voltage generating means 16, and the same operation as the apparatus shown in FIG. 6 is performed without using a special pulse generating circuit. It goes without saying that the same operation occurs when the diode indicated by the broken line is connected.

FIG. 2 is a partial electrical circuit diagram showing another actual winder J of the photographic flash device according to the present invention, in which the same reference numerals as in FIG. 1 indicate the same members.

In this embodiment, a power supply capacitor 27 is connected between the output terminal 20 of the voltage generation circuit 16 and the light emission stop signal generation circuit 9, and the power supply capacitor 27 is charged with a predetermined voltage generated at the output terminal 20. A diode 28 is provided to control the charging voltage so that it is supplied only to the light emission stop signal generating circuit 9, that is, not supplied to the dividing means 21.

By configuring as described above, the light emission stop signal generation circuit 9 can output the light emission stop signal for a predetermined period even after the output of the predetermined voltage by the voltage generation circuit 15 is stopped.
In other words, it is possible to control the operation of the light emission stop signal generation circuit 9 so that it always stops after the voltage output operation of the dividing means 21 is completed.

FIGS. 3(a) and 3(b) fl are partial electrical circuit diagrams showing still another embodiment of the photographic strobe device according to the present invention, in which the same reference numerals as in FIG. 1 indicate the same members. There is.

The embodiment shown in FIGS. 3(2L) and 3(b) is an example in which a thyristor SCR or 5CR2 is used as the switching element 11, which uses the transistor Tr in FIG. 1.

The example shown in FIG. 3(a) is 5C which is the switch element 11.
R1 has its anode connected to the connection point between the transistor 1o and the parallel body 12, and its cathode connected to the earth line, and resistors R, R1 are connected between the anode and the gate, and between the gate and the cathode, respectively.
, R2 are connected, and a transistor 23 is further connected between the gate and the cathode, and its operation is exactly the same as the embodiment shown in FIG.

That is, S, which is the switch element 11 shown in FIG.
CR, is gated by turning on the transistor 23 by supplying a trigger signal and a predetermined voltage from the dividing means 21.
The cathodes are short-circuited and maintained in the OFF state, and the transistor 26 is turned on by the output of the light emission stop signal from the light emission stop signal generation circuit 9, which turns off the transistor 23, and gate voltage is supplied through the resistors R1+R2, resulting in the ON state. It will be done.

As is clear from the drawing, the embodiment shown in FIG. 3(b) has the following features:
5CR2, which is the switch element 11, has its anode connected to the connection point between the transistor 10 and the parallel body 12, its cathode connected to the ground line, and its gate connected to the capacitor CG and the resistor R forming the gate circuit 29.

They are connected to the respective connection points.

Further, the gate circuit 29 is connected to the base of the transistor 1o through the diode DG, and to the emitter of the transistor 10, that is, the power supply side, through the resistor R5.

In FIG. 3(b), the capacitor fG of the gate circuit 29
a is charged to the graphical mark when the power switch 2 is turned on, and is discharged through the transistor 22 and the diode D when the transistor 22 is turned on for light emission operation, that is, by supplying a trigger signal, and is discharged through the transistor 22 and the diode D when the light emission stop signal is turned on. When the transistor 26 is turned on, the transistor 22 is turned off, so that the transistor 22 is charged again to the illustrated polarity, and during this recharging, the charging voltage of the capacitor C of the parallel body 12 turns on the thyristor 5cR2H. Therefore, in such an embodiment, the gate circuit 29° resistor R5r
Diode DG and transistor 22 will function as second control switch means 24.

FIG. 4 is a partial electrical circuit diagram showing still another embodiment of the photographic flash device according to the present invention, in which the same reference numerals as in FIG. 1 indicate the same members.

In this embodiment, a DC-DCC comparator is used in place of the low-voltage battery 1 which is also supplied to the DC-DC converter circuit 3, which was used as a low-voltage power source to supply the base current that turns on the transistor 6 in FIG. - Auxiliary winding t electromagnetically coupled with each winding to oscillation transformer T5 in circuit 3
ls and connect this auxiliary winding I through diode D
A capacitor C charged by the voltage induced in s,
In other words, this is an example in which the charge in the 0th section of the capacitor is used as a low-voltage power source that serves as the source of the base current.

In this case, the voltage supplied to the parallel body 12 etc. can be made higher than when only the low voltage battery 1 is used.On the other hand, when increasing the supply voltage not only in the above case, the charging voltage of the capacitor C of the parallel body 12 can be increased. When the reverse bias voltage of the transistor 6 increases, there is a risk that the transistor 8 may be destroyed depending on the special order of the reverse voltage of the transistor 6. Therefore, as shown by the broken line in FIG. It is preferable to connect a Zener diode ZD with a breakover voltage of .

FIG. 5 is a partial electrical circuit diagram showing still another embodiment of the photographic flash device according to the present invention, in which the same members are indicated by the same reference numerals as in FIGS. 1 and 4.

In this example, the voltage of the low-voltage power supply is detected on the low-voltage power supply side, which is the source of the base current that turns on the transistor.
A voltage detection circuit 3o is provided which forcibly stops the supply of the base current to prevent light emission when the voltage is below a predetermined value.

This voltage detection circuit 3o includes a resistor R, which divides the voltage of a low-voltage power supply that is a supply source of the base current of the transistor 6.
4* R5, the divided voltage of this dividing resistor R4r R5 is compared with the reference voltage of the reference power source Es, and when the divided voltage is less than the reference voltage, a low level signal is output, and the input terminal 14 of the trigger signal is set to a low level. with transistor 22.2
A comparator 31 that forcibly turns off the main capacitor 4, and a dividing resistor R that divides the charging voltage of the main capacitor 4.
6. Ry, output terminal 311L of the above comparator 31
It has a control input terminal 33 & connected to this terminal 33
A voltage display circuit 32 is also provided, which is in an operating state when a high level signal is input to 2L, and is made up of a control section 33 that lights up a display LED 34 when the voltage divided by the dividing resistors R6 and R7 is equal to or higher than a predetermined value. .

Further, the figure number 36 indicated by a broken line indicates a high-voltage external power source that can be used as a power source.

It goes without saying that the control system for the transistor 6 in this embodiment is based on FIGS. 3(&) and 4.

By configuring as described above, it is possible to solve the following problems that may occur when the flash discharge tube 5 is repeatedly caused to emit light or when the external power source 36 is used.

That is, in the case described above, although the charging voltage of the main capacitor 4 is sufficient, the terminal voltage on the low-voltage power supply side that supplies the base current of the transistor 6 is insufficient, and the desired base current cannot be supplied. There is a risk of causing inconveniences such as destruction.

However, in the embodiment shown in FIG. 6, the voltage detection circuit 30 operates in the above case, and the comparator 31 outputs a low level signal to its output terminal 31a, blocking the trigger signal and 22.23 is forced into the off state.

Therefore, if the flash discharge tube 6 is emitting light, the transistor 26
Turns off transistor 1° in the same way as when it turns on, and turns off 5C.
By turning on R1, the base current of the transistor 6 is cut off and the transistor 6 is reverse biased.

In addition, when the flash discharge tube 6 is not emitting light,
Since the trigger signal is blocked, the next light emission operation will be controlled.

That is, in either case, the base current of the transistor 6 is not supplied and light emission is blocked, and as a result, in the case of repeated light emission, etc., the transistor 6 is destroyed due to the light emission operation due to the insufficient supply of base current. It never happens.

Effects of the Invention As mentioned above, the photographic strobe device according to the present invention utilizes a voltage generating circuit that a strobe device normally has to supply the base current of a transistor connected in series to a flash discharge tube. Since the base current is supplied only when necessary, that is, in a pulsed manner, there is no special need for a pulse generation circuit for forming a pulse signal.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of an embodiment of a photographic strobe device according to the present invention, FIGS. 2, 3 (IL), (b), and 4.
figure. FIG. 6 is a circuit diagram showing the main parts of another embodiment of the photographic flash device according to the present invention. FIG. 6 is an electrical circuit diagram showing the basic configuration of a photographic flash device previously proposed by the applicant in Japanese Patent Application No. 60-215439. 1...Battery, 2...Power switch, 4
... Main capacitor, 5 ... Flash discharge tube, 6 ... Transistor, 11 ... Switch element, 12 ... Parallel body, 13・・・・・・
Trigger circuit, 14... Input terminal, 15...
...Voltage generating circuit, 16.19... Capacitor, 17. River... Transistor, 18. Mountain... Zener diode, 20... Output terminal, 21...
...Dividing means, 22.23...Transistor,
24...first control switch means, 26...
. . . second control switch means, 26 . . . transistor, 27 . . . power supply capacitor, 28.
...Diode, 29...River/gate circuit, 3o
... group voltage detection circuit, 31 ... comparator, 32 ... voltage display circuit, 33 ... control section, 34 ... display r, un, 3s・・・・・・
External power supply, 5Crt, 5CR2・mountain・thyristor, CG・・・・capacitor, RG・mountain・resistor,
D...Diode, (IB...mark/auxiliary winding, D...diode, 0 rin...mountain...capacitor, zD...zener diode. Representative's Name Patent attorney Toshio Nakao and 1 other person
Flood attractive pressure 17-Transistor 2-Power switch
18-Zener diode 4-Main capacitor Tada-Riki Miko 5-Internal discharge tube? ! -Division 6-Transistor 22.2!3-) Transistor//
-, Swift + Forbidden 24-year-old III commander Suishi ten means 12-tLFI body? 5-O2 peeling switch)+Means 14-Manual power supply 26-Transistor 15-1 voltage generation time $C-Connancer 27-Electricity; Raw material congilresor circle-Di' diode Fig. 2 Fig. 3 η- Gate circuit (α) (b) o-j iode 1S-catch winding Zo --Zener diode Fig. 4

Claims (11)

[Claims] (1) A first series body consisting of a flash discharge tube and a first transistor connected to both ends of a main capacitor charged by a DC high voltage power supply, and a parallel body consisting of a second transistor, a current control element, and a capacitor. a second series body connected to both ends of the low voltage power supply via the base and emitter of the first transistor; and a second series body connected between the base and emitter of the first transistor via the parallel body. a switch element, a trigger circuit that operates in response to a trigger signal, which is a pulse signal formed by closing a synchro switch of a camera, to excite the flash discharge tube; and a trigger circuit that excites the flash discharge tube; a light emission stop signal generation circuit that detects and outputs a light emission stop signal for the flash discharge tube; and a first control that operates upon receiving the trigger signal to turn on the second transistor and turn off the switch element. a switch means, which detects light emission of the flash discharge tube, outputs a predetermined voltage, and supplies the predetermined voltage output to the light emission stop signal generation circuit and to the first control switch means; a voltage generating circuit that maintains the first control switch means in an operating state during light emission; and a voltage generation circuit that operates upon receiving a light emission stop signal from the light emission stop signal generation circuit to stop the operation of the first control switch means. A photographic flash device comprising second control switch means for turning off a second transistor and turning on the switch element. (2) The switch element is a third transistor whose main electrode is connected to both ends of a series connection between the parallel body and the base-emitter of the first transistor.
Photographic strobe device as described in section. (3) The first control switch means includes a fourth transistor whose main electrode is connected between the base of the second transistor and ground, and whose control electrode is connected to the input terminal of the trigger signal and the output terminal of the voltage generation circuit; 2. The photographic strobe device according to claim 1, comprising a fifth transistor, the main electrode of which is connected between the control electrode of the switch element and the ground, and the control electrode of which is connected to the control electrode of the fourth transistor. (4) The photographic flash device according to claim 1, wherein the second control switch means is a sixth transistor whose main electrode is connected between the output terminal of the voltage generating circuit and ground. (5) The light emission stop signal generation circuit is configured to prevent the charged charge of the power supply capacitor charged via the diode from being supplied to the first control switch means at the predetermined voltage output of the voltage generation circuit. A photographic strobe device according to claim 1 of the appended claims. (6) The photographic flash device according to claim 1, wherein the switch element is a thyristor whose anode is connected to a connection point between the parallel body and the second transistor and whose cathode is connected to ground. (7) The switch element is a thyristor whose anode is connected to the connection point between the second transistor and the parallel body and whose cathode is connected to ground, and the first control switch means is a thyristor whose main electrode is connected to the base of the second transistor. A fourth transistor is connected between the ground and the control electrode is connected to the input terminal of the trigger signal and the output terminal of the voltage generation circuit, and a series body of a capacitor and a resistor is connected to both ends of the low voltage power supply. a gate circuit whose connection point is connected to the gate of the thyristor; and a gate circuit connected between the connection point of the low voltage power supply and the gate circuit and the base of the second transistor when the fourth transistor is turned on. 2. A photographic strobe device according to claim 1, further comprising a diode for discharging the charge of a capacitor. (8) The DC high-voltage power supply is a DC-DC converter circuit, and the low-voltage power supply is a capacitor charged via a diode by a voltage induced in an auxiliary winding provided in an oscillation transformer of the DC-DC converter circuit. A photographic flash device according to claim 1. (9) The photographic strobe device according to claim 1, wherein the parallel body further includes a Zener diode connected in parallel. (10) A first series body consisting of a flash discharge tube and a first transistor connected to both ends of a main capacitor charged by a DC high voltage power supply, and a parallel body consisting of a second transistor, a current control element, and a capacitor. a second series body connected to both ends of the low voltage power supply via the base and emitter of the first transistor; and a second series body connected between the base and emitter of the first transistor via the parallel body. a switch element, and a trigger circuit that operates in response to a trigger signal, which is a pulse signal formed by closing a synchro switch of a camera, to excite the flash discharge tube;
a light emission stop signal generation circuit that detects a point in time when a desired amount of light is emitted from the flash discharge tube and outputs a light emission stop signal for the flash discharge tube; and a light emission stop signal generation circuit that operates upon receiving the trigger signal.
a first control switch means for turning on the transistor and controlling the switch element to an off state; detecting light emission of the flash discharge tube and outputting a predetermined voltage; and transmitting the predetermined voltage output to the light emission stop signal generation circuit. a voltage generation circuit that maintains the first control switch means in an operating state while the flash discharge tube is emitting light by supplying the voltage to the first control switch means; and a voltage generation circuit that supplies a voltage to the first control switch means to maintain the first control switch means in an operating state while the flash discharge tube is emitting light; and a voltage generation circuit that stops the light emission from the light emission stop signal generation circuit. a second control switch means which operates in response to a signal to stop the operation of the first control switch means, turn off the second transistor, and turn on the switch element; A photographic strobe comprising: a voltage detection circuit that blocks the supply of the trigger signal to the trigger circuit and forcibly controls the first control switch means to be inactive when the terminal voltage is below a predetermined value. Device. (11) The DC high-voltage power supply is a DC-DC converter circuit, and the low-voltage power supply is a capacitor charged via a diode by a voltage induced in an auxiliary winding provided in an oscillation transformer of the DC-DC converter circuit. A photographic flash device according to claim 10.