JPH11338022A - Flashing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make the emitted light waveform of a 1st light emitting means in specified relation, such as similar figures, to the light output waveform of a 2nd light emitting means being reference by controlling the light output of the 1st light emitting means with respect to the light output of the 2nd light emitting means being the reference. SOLUTION: A high level signal is impressed on the gates of IGBTs 19 and 13 from a light emitting signal forming circuit 30 and inputted in trigger circuits 17 and 11, so that discharge tubes 18 and 12 start light emission. After the delay of specified time, the output of a delay circuit 28 becomes a low level, and a transistor 23 is turned off, then the action of a 1st photodetecting means 24 detecting the emitted light of the discharge tube 12 is started. The output of a comparator 26 is shifted to the low level, the IGBT 13 gets non-conductive, and the current of the discharge tube 12 is decreased. When the output of the 1st photodetecting means 24 becomes lower than the output of the 2nd photodetecting means 21 detecting the emitted light of the discharge tube 18 being the reference, the output of the comparator 26 is inverted and becomes a high level, the IGBT 13 gets conductive and the discharge current of the discharge tube 12 is increased. Such operation is repeated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flash device used for photographing and the like.

[0002]

2. Description of the Related Art Conventionally, there have been provided various flash devices which have a light emitting section having a plurality of flash discharge tubes and control the amount of light emitted therefrom.

For example, Japanese Utility Model Application Laid-Open No. 52-112178 discloses a technique in which a plurality of light-emitting portions emit light at the same time, and when the amount of light reflected from a subject reaches a predetermined value, the light-emitting portions stop emitting light simultaneously. ing. Japanese Patent Application Laid-Open No. 57-1
Japanese Patent Publication No. 18230 discloses a flash device having two light-emitting portions, almost equal flash times, and almost similar flash waveforms.

[0004]

However, in Japanese Utility Model Laid-Open Publication No. 52-112178, the ratio of the light output of each light emitting unit is almost the same, and the ratio of the light output of each light emitting unit is arbitrarily set by the flash device. It was impossible. In addition, Japanese Unexamined Patent Publication No.
In Japanese Patent Application Laid-Open No. 7-118230, it is impossible to arbitrarily set the ratio of the light output of each light-emitting unit as in the above-described conventional example.

[0005]

In view of the above, in the first aspect of the present invention, a first light emitting means, a second light emitting means, and the first and second light emitting means are substantially constituted. A light emission drive means for simultaneously starting light emission, a first light detection means for detecting a light intensity of the first light emission means and generating a first output corresponding to the light intensity, and a second light emission means. A second light detection unit that detects light intensity and generates a second output corresponding to the light intensity, a comparison unit that compares the first output and the second output, and a comparison result of the comparison unit And a control device for controlling the first light-emitting means in accordance with the above-described method, to provide a flash device for controlling the light output of each light-emitting section.

According to a second aspect of the present invention, a first light-emitting means, a second light-emitting means, a light-emitting drive means for starting the first and second light-emitting means to emit light almost simultaneously, and the first light-emitting means. The first light detecting means for detecting the light intensity of the means and generating a first output corresponding to the light intensity, and a second output corresponding to the light intensity of the second light emitting means are predetermined. Output generating means generated in the procedure, a comparing means for comparing the first output and the second output, and a control means for controlling the first light emitting means according to the comparison result of the comparing means, An object of the present invention is to provide a flash device for controlling a light output of a light emitting unit.

According to a third aspect of the present invention, in the device according to the first aspect, the first light detecting means has means for generating an output proportional to light intensity, and the first light emitting means and the second light An object of the present invention is to provide a flash device in which light emission waveforms of light emission means are controlled to be substantially similar.

According to a fourth aspect of the present invention, in the device according to the second aspect, the output generating means generates the second output such that the light emission waveforms of the first and second light emitting means are substantially similar. A flash device is provided. According to a fifth aspect of the present invention, in the device of the first to fourth aspects, a delay circuit that operates in response to an output of the driving unit, and an operation of the first detecting unit in response to an output of the delay circuit. And a light detecting operation starting means for starting the first detecting operation. The first detecting operation is started after a predetermined time delay from the start of light emission of the first and second light emitting means.

According to claim 6 of the present invention, claim 1 or 3
In the above device, there is provided a light detection output variable means of the first or second light detection means, and the light output ratio of the first light emitting means and the second light emitting means is changed by the light detection output variable means. The present invention provides a flash device capable of performing the above.

According to a seventh aspect of the present invention, as a specific configuration of the apparatus of the first to sixth aspects, the first light emitting means has a first discharge tube, and the second light emitting means has a second light emitting means. The present invention provides an apparatus having a discharge tube, wherein the first and second discharge tubes are connected to the same capacitor and supplied with luminous energy.

According to claim 8 of the present invention, claim 1 or 2
Wherein the control means controls a light emitting operation of the first light emitting means such that the first and second outputs have a predetermined ratio according to the comparison result. It is.

According to claim 9 of the present invention, claim 1 or 2
Or stopping the light emission of the first light emitting means when the first output has the first relationship with the second output according to the comparison result by the operation of the control means in the device of 8 above. Thus, an apparatus is provided which controls the first light emitting means to emit light when the first relation is disturbed.

According to a tenth aspect of the present invention, the first light-emitting means, the second light-emitting means, the light-emitting drive means for starting the first and second light-emitting means to emit light almost simultaneously, and the first light-emitting means. Control means for detecting the light intensity of the means, controlling the light intensity of the second light emitting means in accordance with the light intensity, and providing a flash device for controlling the light emission amount of each light emitting section. .

According to an eleventh aspect of the present invention, the light intensity of the second light emitting means is controlled by the operation of the control means so as to have a predetermined ratio with respect to the light intensity detected by the first light emitting means. It is intended to provide an apparatus for performing the above.

According to a twelfth aspect of the present invention, in the apparatus of the eleventh aspect, setting means for variably setting the ratio is provided,
It is intended to provide an apparatus for arbitrarily setting a ratio.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on the illustrated embodiment.

FIG. 1 is for explaining a first embodiment of the present invention.

Reference numeral 1 denotes a power supply battery. Reference numeral 2 denotes a booster circuit, which charges a capacitor 3 described later connected to an input 1 to a positive pole of the power supply battery 1 and to an output 2 to a high voltage. 3
Is a main condenser for supplying luminous energy to the discharge tubes 12 and 18 described later. Reference numeral 4 denotes a coil having one end connected to the positive pole of the capacitor and the other end connected to the anode of the discharge tube 12. 5 is an SCR connected in parallel to the coil.
Reference numerals 6, 7, and 10 denote resistors. The resistor 6 is connected between the gate and the cathode of the SCR.
The other end is connected to the anode of a diode 8 described later, and the resistor 10 is connected between the gate and the anode of the SCR. Reference numeral 8 denotes a diode, whose anode is connected to the resistor 7 and whose cathode is connected to the collector of a transistor 9 described later. Reference numeral 9 denotes an NPN transistor. The collector is connected to the cathode of the diode 8, the emitter is connected to the negative pole of the capacitor 3, and the base is connected to the output of the bistable multivibrator 29. Reference numeral 11 denotes a well-known trigger circuit as first light emission driving means for generating a high-frequency high voltage at the output 2 in synchronization with the rise of the pulse when the pulse is applied to the input 1 and for triggering a discharge tube 12 described later. 1 is a bistable multivibrator 29 described later.
The output 2 is connected to a trigger electrode of the discharge tube 12 described later. Reference numeral 12 denotes a flash discharge tube as a first light emitting means. An anode is connected to one end of the coil 4, a trigger electrode is connected to an output 2 of the trigger circuit 11, and a cathode is connected to a collector of an IGBT 13 as a switching element described later. Have been. Reference numeral 13 denotes an IGBT (Gate Insulated Bipolar Transistor) serving as a first light emission stopping means. A collector is a cathode of the discharge tube 12, a gate is an output 3 of an OR gate 33 described later, and an emitter is a capacitor of the capacitor 3. Each of the negative poles is connected. A diode 14 has an anode connected to the cathode of the discharge tube 12 and a cathode connected to the positive pole of the capacitor 3. Reference numeral 15 denotes a coil, one end of which is connected to a positive pole of the capacitor 3 and the other end of which is connected to an anode of a discharge tube 18 which will be described later. Reference numeral 17 denotes a well-known trigger circuit as second light emission driving means for generating a high-frequency high voltage at the output 2 in synchronization with the rise of the pulse when the pulse is applied to the input 1 and triggering a discharge tube 18 described later. 1 is connected to an output 2 of a bistable multivibrator 29 described later, and output 2 is connected to a trigger electrode of the discharge tube 18 described later. Reference numeral 18 denotes a flash discharge tube which is a second light emitting means, an anode is provided at one end of the coil 15, a trigger electrode is provided at the output 2 of the trigger circuit 17, and a cathode is provided at the I / O terminal.
Each is connected to the collector of GBT19. 19
Is an IGBT (Gate Insulated Bipolar Transistor) as a second light emission stopping means, a collector is connected to a cathode of the discharge tube 18, a gate is connected to an output 2 of a bistable multivibrator 29 described later, and an emitter is connected to the capacitor 3. Each of the negative poles is connected. Reference numeral 20 denotes a well-known voltage stabilizing circuit. An input 1 is connected to a positive pole of the power supply battery 1 and an output 2 is a photodetector circuit described later, a comparator 26, a delay circuit 28 described later, a bistable multivibrator 29, a photometric circuit 31, and the like. Connected to supply power to them. 21 is a photodiode as a light receiving element,
The anode is connected to a plus input of a comparator 26 described later, and the cathode is connected to the output 2 of the voltage stabilizing circuit 20. The light receiving element 21 is provided so that the emitted light of the discharge tube 18 can be detected directly or substantially directly without passing through a subject. Reference numeral 22 denotes a resistor, one end of which is connected to the anode of the photodiode 21 and the other end of which is connected to the negative pole of the power battery 1. The photodiode 21 and the resistor 22 form a second light detecting unit. Reference numeral 24 denotes a photodiode as a light receiving element. The anode is connected to the minus input of a comparator 26 described later, and the cathode is connected to the output 2 of the voltage stabilizing circuit 20. The light receiving element 24 is the discharge tube 12 described above.
Is provided so that the emitted light can be detected directly or substantially directly without passing through the subject. Reference numeral 25 denotes a variable resistor, one end of which is connected to the anode of the photodiode 24 and the other end of which is connected to the negative pole of the power battery 1. The photodiode 24 and the variable resistor 25 form a first light detecting means. The variable resistor 25 is a detection output varying means, and can vary the detection output of the light detecting means by setting a resistance value in advance. 23 is NP
An N-transistor has a collector connected to the anode of the photodiode 24, an emitter connected to the negative pole of the power supply battery 1, and a base connected to an output 2 of a delay circuit 28 described later. The transistor 23 operates as a light detection operation start means. Reference numeral 26 denotes a comparator as a comparing means. The plus input is connected to the anode of the photodiode 21, the minus input is connected to the anode of the photodiode 24, and the output is connected to the input 1 of an AND gate 27 described later. Reference numeral 27 denotes an AND gate. The input 1 is connected to the output of the comparator 26, the input 2 is connected to the output 2 of a bistable multivibrator 29 described later, and the output 3 is connected to the input 1 of the OR gate. 28
Is a well-known delay circuit that changes the output from a low level to a high level when a high signal is applied to an input 1 and starts a delay operation, and after a predetermined time, changes the output 2 from a high level to a low level. Is connected to the output 2 of a bistable multivibrator 29 described later, and the output 2 is connected to the base of the transistor 23, respectively. Reference numeral 29 denotes a bistable multivibrator. The input 1 is connected to the output 3 of the OR gate 32 described later, and the output 2 is connected to the input 1 of the delay circuit 28. An emission start signal forming circuit 30 has an output 1 connected to an input 1 of an OR gate 32 described later. The signal forming circuit is connected to a synchro contact of a camera (not shown), and outputs a pulse having a very short time width to the output 1 in synchronization with the closing of the contact. Reference numeral 31 denotes a photometric circuit, and the output is connected to an OR gate 32 described later. The photometric circuit 31 as photometric means
The reflected light from the object of the discharge tube 18 is measured, and when the amount of reflected light reaches a predetermined value, a high-level light emission stop signal is generated and output to the OR gate. 32 is an OR gate, and input 1 is output 1 of the light emission start signal generation circuit 30.
The input 2 is connected to the output 1 of the photometric circuit 31, and the output 3 is connected to the input 1 of the bistable multivibrator 29. Reference numeral 33 denotes an OR gate. The input 1 is connected to the output 3 of the AND gate, the input 2 is connected to the output 2 of the delay circuit 28, and the output 3 is connected to the gate of the IGBT 13. Here, the discharge tubes 12 and 18, the coils 4 and 15, and the photodiodes 21 and 24 have substantially the same characteristics. Accordingly, if the resistance value of the resistor 22 and the resistance value of the variable resistor 25 are set to be the same, the same output is generated for the same light intensity. The output of the detecting means is set to be twice that of the second light detecting means.

Next, the operation of the figure will be described in detail.

The capacitor 3 is connected to the discharge tube 1 by the booster circuit 2.
Assume that 2 and 18 are charged to a voltage sufficient to emit light. When the camera (not shown) is released and the shutter is fully opened and the synchro contact is closed, a pulse is output from the light emission signal forming circuit 30 and the pulse is transmitted to the input 1 of the bistable multivibrator 29 via the OR gate 32. Is done. The output of the multivibrator 29 shifts from a low level to a high level. The high level signal is applied to the gate of the IGBT 19 to make it conductive,
At the same time, it is supplied to the input 1 of the trigger circuit 17 to drive the trigger circuit 17. By the driving, a high-frequency high voltage is applied to the trigger electrode of the discharge tube 18, so that the electric charge of the capacitor 3 is discharged through the coil 15, the discharge tube 18, and the IGBT 19, and the discharge tube 18 starts emitting light. The output of the bistable multivibrator 29 is the input 1 of the delay circuit 28.
Also changes from low level to high level. This change is given to the input 2 of the OR gate 33, and the output 3 of the gate 33 is set to the high level to make the IGBT 13 conductive. Further, the output of the bistable multivibrator 29 is given to the input 1 of the trigger circuit 11, so that the trigger circuit 11 is driven, and a high-frequency high voltage is output to the output 2 thereof, and the discharge tube 12 is ionized. Discharge is performed via the coil 4, the discharge tube 12, and the IGBT 13, and the discharge tube 12 starts emitting light. The light emission of the discharge tube 12 starts almost simultaneously with the light emission of the discharge tube 18. In the initial stage of light emission, as described above, the discharge tubes 12 and 18 and the coils 4 and 1
5 have almost the same characteristics, the discharge current is the same in both discharge tubes. After the light emission is started and the output of the delay circuit 28 becomes low level after a delay of a predetermined time, the transistor 23 is turned off and the operation of the first light detecting means starts.
At the start of the operation, the output of the first light detecting means is twice as large as the output of the second light detecting means.
6 goes low and the AND gate 27 and O
This is applied to the gate of IGBT 13 via R gate 33. As a result, the IGBT 13 becomes non-conductive, and the coil 4
Is discharged through the discharge tube 12 and the diode 14, and then the current in the discharge tube 12 decreases. When the output of the first light detecting means becomes lower than the plus input of the comparator 26, the output of the comparator 26 is inverted to a high level, the IGBT 13 becomes conductive, and the discharge current of the discharge tube 12 increases. When the output of the first light detection means exceeds the positive input of the comparator 26 again, the output of the comparator 26 shifts to a low level,
As described above, the energy of the coil 4 is discharged via the discharge tube 12 and the diode 14. Then, when the discharge current decreases, the comparator 26 is again inverted and the IGBT
13 turns on, the discharge current increases, and this is repeated. Discharge tube
The light reflected from the subject due to 12 and 18 is detected by the photometric circuit 30, and when the amount of reflected light reaches a predetermined value, the photometric circuit 30
A pulse is output from the output 1 of the bi-stable multivibrator 29 via the OR gate 32.
As a result, the output of the multivibrator 29 is inverted to a low level. The low level is transmitted to the gate of the IGBT 19, the IGBT is turned off, and the light emission of the discharge tube 18 stops. The low level signal is supplied to the AND gate 27.
When the output of the comparator 26 is at a high level, ie, when the IGBT 13 is conducting,
A low level signal is transmitted to the gate of BT13. As a result, the IGBT 13 becomes non-conductive. The low level output of the bistable multivibrator 29 is
And the transistor 9 is turned off.
Therefore, when the IGBT 13 becomes non-conductive and a voltage is generated in the coil 4, a current flows to the gate of the SCR 5 via the resistor 10, the SCR 5 becomes conductive, and the energy stored in the coil is released through the SCR 5. Since the energy stored in the coil 4 at that time is not released through the discharge tube 12 and the diode 14, the current of the discharge tube 12 is
And the discharge tube 12 stops emitting light at the same time as turning off. Here, until the light emission stop signal is output from the bistable multivibrator 29, since it is outputting a high-level signal, the transistor 9 is turned on and I
Even when a voltage is generated in the coil 4 when the GBT 13 is turned off, the SCR 5 is not turned off because a negative voltage is applied to the gate of the SCR 5 to the cathode. Therefore, as described above, the energy of the coil 4 is controlled by the discharge tube 12 and the diode 1
4 to be released. The above operation is performed by the comparator 26
Is at the high level, and the case of the low level will now be described. At this time, when the output of the bistable multivibrator 29 becomes low, the IGBT 13 is already in a non-conductive state and is discharging the energy stored in the coil 4. However, as described above, the transistor 9 is turned off and the coil 4 is turned off.
Is discharged through the SCR 5, so that the discharge tube 12
Does not flow, and the light emission stops. The above SCR
5, coil 4, diode 7, transistor 9, resistor 6
And 10 are described in Japanese Patent Application Laid-Open No. H8-160509.
2. The operation is substantially the same as that of the diode 19, the transistor 20, the resistors 17 and 1018.

The operation of FIG. 1 will be described with reference to the graph shown in FIG.

When an output pulse is generated from the light emission signal forming circuit at T1 as described above, the discharge tubes 12 and 18 start emitting light. From the start of light emission to the time T2 when the output 2 of the delay circuit 28 is generated, the light emission waveforms of the two discharge tubes are almost the same because the discharge current of the discharge tube 12 is not controlled as described above. Next, after the time T2, the discharge current of the discharge tube 12 is controlled by the detection result of the light detection means as described above.
The light emission waveform 2 is a waveform accompanied by light ripple as shown in the graph. This ripple is caused by the energy release of the coil generated when the IGBT 13 is repeatedly turned on and off as described above. Therefore, the light output of the discharge tube 12 is larger than the preset light output ratio by the amount of the ripple, but can be generally ignored when the light output of the discharge tube 12 is relatively large. If it cannot be ignored, the value of the ratio variable resistor 25 may be adjusted in advance in consideration of the ripple. Thereafter, when an output signal is generated from the photometric circuit 31 at T3, the IGBTs 19 and 13 become non-conductive as described above, and light emission stops. Therefore, as shown in the graph, the discharge tube 12
The light emission waveforms of and 18 are controlled substantially similarly.

The reason why the operation of the light detecting means is started with a delay of a predetermined time after the start of light emission as described above is as follows. When the initial light emission is very small, the output of the light detection means is extremely small, and it is not possible to perform normal detection, and a malfunction may occur in which the light emission operation stops, and the above-described reason is to prevent this malfunction. . However, if a delay circuit is provided and the operation of the light detecting means is started after a predetermined time, there is a disadvantage that the light output of the first light emitting means is not controlled during the predetermined time and the same light output as the second light emitting means is output. is there. However, since the predetermined time is very short, for example, about 10 microseconds, it does not pose a problem in practical use.

In FIG. 1, the variable resistor 25 is provided in the first light detecting means. However, even if the resistor 22 is replaced with a variable resistor and the variable resistor 25 is replaced with a fixed resistor, the light of the first and second light emitting means is changed. The output ratio can be set by a variable resistor provided in the second light detecting means.

As described above, the light output of the second light emitting means (discharge tube 18 in FIG. 1) serving as a reference is detected, and the first light emitting means (discharge tube 12 in FIG. 1) is always detected in response to the light output. Are controlled so as to have a predetermined ratio (1/2 in FIG. 1), the light emission waveforms can be made substantially similar. The ratio can be arbitrarily set by changing the resistance value of the variable resistor 25.

FIG. 3 is for explaining a second embodiment of the present invention.

In FIG. 3, the parts other than those surrounded by the dotted lines are illustrated.
1 is the same as the circuit except for the portion surrounded by the dotted line.
Elements having the same functions as those described above are given the same numbers, and descriptions of these elements are omitted.

In FIG. 3, reference numeral 34 denotes a microcomputer having a built-in D / A converter, which is stored in an output port 2 connected to the D / A converter in synchronization with the transition of the port 1 to a high level. An analog voltage that changes over time based on the contents of the output is output. This output voltage waveform is set in advance to be a voltage waveform substantially similar to the light emission waveform of the discharge tube 18 in FIG.

FIG. 3 also shows the discharge tubes 12 and 1 as in FIG.
8, coils 4 and 15, and photodiodes 21 and 24 have substantially the same characteristics.

Next, the operation of FIG. 3 will be described.

The process until the discharge tubes 12 and 18 emit light is the same as in FIG. 1, so that the operation is omitted here. When the discharge tube 12 emits light and the output of the delay circuit 28 becomes low level, the operation of the first light detecting means is started. At this time, the light from the discharge tube 12 has already been irradiated to the photodiode 24, and the output of the photodiode 24 has exceeded the output voltage of the microcomputer 34.
Changes from the high level to the low level. This low level is transmitted to the gate of the IGBT via the AND gate 26 and the OR gate 33, and the IGBT 13 is turned off. Thereafter, the same operation as in FIG. 1 is performed, and when the light emission output of the discharge tube 12 is reduced and the output of the first light detecting means is reduced to become lower than the output voltage of the output port 2 of the microcomputer 34, the output of the comparator 26 shifts to the high level. Then, it is applied to the gate of the IGBT 13 via the AND gate 27 and the OR gate 33 and becomes conductive, so that the discharge tube 12
The light emission output of is increased. Due to this increase, the output of the first optical detection means increases again, and the IGBT becomes non-conductive as described above, and this is repeated thereafter. Next, discharge tubes 12 and 13
When the reflected light from the subject reaches a predetermined level, the output 1 of the photometric circuit 31 goes high, and the discharge tube 1
Light emission of 2 and 18 stops. The discharge tubes 12 and 18 at this time
Is substantially the same as the waveform shown in FIG.

Also in FIG. 2, the ratio of the light output of the first and second light emitting means can be arbitrarily set by the variable resistor 25.

In the above description of FIGS. 1 and 2, the light outputs of the first and second light emitting means have a similar relationship. However, if a diode or the like which is a non-linear element is used instead of the resistor 22 in FIG. Although the flash duration is the same, it is also possible to make the waveforms of the light output of the first and second light emitting means have a predetermined relationship other than similarity. In FIG. 2 as well, the analog signal output from the microcomputer 34 can be changed to the first and second analog signals by changing the stored contents so that a waveform different from the emission waveform of the discharge tube 18 in FIG. It is also possible to make the waveform of the light output of the light-emitting means have a predetermined relationship other than similarity.

[0034]

As described above, according to the flash device of the first aspect, the latter light output is controlled by comparing the light output of the reference light emitting means with the light output of the controlled light emitting means. Therefore, it is possible to make the latter light emission waveform into a predetermined relationship such as a similar shape with the light output waveform of the light emitting means as a reference.

According to the second aspect of the present invention, the light output of the first light emitting means is controlled by comparing the light output of the controlled light emitting means with the second output generated in a predetermined procedure. Therefore, it is possible to make the light emission waveform of the first light emitting means have a predetermined relationship such as a similar shape with the light output waveform of the second light emitting means.

According to the third and fourth aspects, the light emission waveforms of the first light emitting means and the second light emitting means can be made substantially similar.

According to the fifth aspect of the present invention, the operation of the light detecting means for detecting the light output of the controlled light emitting means is delayed by a predetermined time from the start of the light emission. Since it is not performed, it is possible to remove the unstable control.

According to the flash device of the present invention, since the light detection output variable means is provided, the ratio of the light output of each light emitting means can be arbitrarily set in advance.

According to the flash device of the present invention, the luminous energy of each discharge tube constituting the luminous means is obtained from the same capacitor, so that the ratio of each luminous means when all the energy of the capacitor is discharged is determined. Irrespective of this, it is possible to make the sum of the light emission outputs of the respective light emitting means substantially constant.

According to the flash device of the eighth aspect, since the control means controls the ratio of the first and second outputs so as to have a predetermined relationship, the ratio of the light emitting state of each light emitting unit is controlled to a desired ratio. it can.

In the ninth aspect, simplification can be achieved by configuring the control means.

According to the tenth aspect, similarly to the first or second aspect, the waveform of the second light emitting means can be controlled based on the first light emitting means.

In the eleventh and twelfth aspects, the waveforms of the first and second light emitting means can be controlled at an arbitrarily set ratio.

[Brief description of the drawings]

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

FIG. 2 is a waveform chart for explaining the operation of the circuit of FIG. 1;

FIG. 3 is a circuit diagram showing another embodiment of the present invention.

[Explanation of symbols]

 12, 18 Discharge tube 13, 19 IGBT 21, 24 Light receiving means 22 Resistor 25 Variable resistor 23 Transistor 26 Comparator 28 Delay circuit 34 Microcomputer

Claims (12)

[Claims] 1. A first light emitting means, a second light emitting means,
Light-emitting drive means for causing the first and second light-emitting means to start emitting light substantially simultaneously, and first light for detecting the light intensity of the first light-emitting means and generating a first output corresponding to the light intensity Detecting means, light intensity of the second light emitting means, a second light detecting means for generating a second output corresponding to the light intensity, and comparing the first output and the second output And a control unit for controlling the first light emitting unit according to a comparison result of the comparison unit. 2. A first light emitting means, a second light emitting means,
Light-emitting drive means for causing the first and second light-emitting means to start emitting light substantially simultaneously, and first light for detecting the light intensity of the first light-emitting means and generating a first output corresponding to the light intensity A detecting unit, an output generating unit that generates a second output corresponding to the light intensity of the second light emitting unit in a predetermined procedure, and a comparing unit that compares the first output and the second output. And a control means for controlling the first light emitting means in accordance with a comparison result of the comparing means. 3. The first light detecting means has means for generating an output proportional to the light intensity, and controls the light emission waveforms of the first light emitting means and the second light emitting means to be substantially similar. The flash device according to claim 1, wherein: 4. The flash device according to claim 2, wherein the output generating means generates the second output so that the light emission waveforms of the first and second light emitting means have substantially similar shapes. 5. A delay circuit that operates in response to an output of the driving unit, and a light detection operation start unit that starts operation of the first detection unit in response to an output of the delay circuit. 5. The flash device according to claim 1, wherein the first detection operation is started with a delay of a predetermined time from the start of light emission of the first and second light emitting units. 6. 6. A light detection output varying means of the first or second light detection means, wherein the light output ratio of the first light emitting means and the second light emitting means is varied by the light detection output varying means. The flash device according to claim 1, wherein the flash device can be used. 7. The first light emitting means has a first discharge tube, the second light emitting means has a second discharge tube, and the first and second discharge tubes are the same capacitor. The flash device according to claim 1, wherein the flash device is connected to and supplied with luminous energy. 8. The light emitting device according to claim 1, wherein the control means controls the light emitting operation of the first light emitting means so that the first and second outputs have a predetermined ratio according to the comparison result.
Or the flash device according to 2. 9. The control means according to the comparison result,
When the first output is in the first relationship to the second output, control to stop the light emission of the first light emitting means,
3. The light emitting device according to claim 1, wherein the first light emitting unit emits light when the first relationship is deviated.
Or the flash device according to 8. 10. A first light emitting means, a second light emitting means, a light emitting drive means for causing the first and second light emitting means to start emitting light almost simultaneously, and detecting a light intensity of the first light emitting means. And a control means for controlling the light intensity of the second light emitting means according to the light intensity. 11. The control device according to claim 10, wherein the control unit controls the light intensity of the second light emitting unit to be a predetermined ratio with respect to the light intensity detected by the first light emitting unit. The flash device according to item 1. 12. The flash device according to claim 11, further comprising setting means for variably setting the ratio.