JPS6117133A - Wireless strobe for multiple flashes - Google Patents

Abstract

PURPOSE:To perform surely strobe photographing with multiple flashes without operating a wireless strobe for multiple flashes, by switching the strobe to a conventional automatic dimming strobe automatically when a light receiving means is directed to the first position and switching the strobe to the wireless strobe for multiple flashes automatically when the light receiving means is directed to the second position. CONSTITUTION:By closing of an X contact, a wireless dimming controller 100 executes the first light emission in a light emitting part 101 and executes the second light emission there after a preliminarily set time. A light receiving part 102 of the controller 100 receives the reflected light from an object and converts it photoelectrically to integrate the quantity of reflected light, and the third light emission is executed when the quantity of reflected light reaches a prescribed value. A dimming circuit (the first control means) 76' connects switches 74' and 75' to contacts (b) (the first position) when a strobe 200 is used as the conventional dimming strobe. This strobe 200 is controlled by the wireless dimming controller 100 when interlocking switches 74' and 75' are switched to contacts (a).

Description

[Detailed description of the invention] This invention relates to a wireless strobe for controlling multiple flashes.

Conventionally, in photographing using a plurality of strobes, each strobe is connected by a cord that transmits a release signal and a light adjustment completion signal so that each strobe responds to a camera release and light adjustment completion signal. However, stretching the cords in this way is complicated, and accidents such as cord breakage always occur. For this reason, in order to control each strobe wirelessly, the gold master strobe attached to the camera detects the light emission start signal from the light generated by this master strobe with the light receiving elements of the other slave strobes, and starts emitting their own light. Japanese Patent Laid-Open No. 52-15428 discloses a technology in which the light receiving element of the slave strobe similarly detects the stop of the master strobe's light emission and stops its own light emission.
1 is proposed. When the master strobe starts firing, the surrounding brightness suddenly becomes brighter, and the slave strobe's light receiving element can easily detect changes in brightness, but when the master strobe starts firing, the slave strobe itself also emits light. When the flash is in the flash mode, the area around the subject is bright, making it difficult to detect when the master strobe has interrupted flashing due to flash control.

As a result, the slave strobe cannot detect that the master strobe has stopped emitting light and emits full light, resulting in the problem that proper exposure cannot be obtained.

Another disadvantage is that the slave strobe cannot be used as a master strobe.

It is an object of the present invention to eliminate these drawbacks and provide a wireless strobe for multiple flashes that can reliably control the light emission of the wireless strobe for multiple flashes and that can be switched and used as a master strobe with a simple configuration. do.

Embodiments of the wireless dimming control system of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic diagram of the system of the present invention.

100 is the main body of the wireless dimming controller, 101 is its light emitting part, 102 is its light receiving part, and 103 is a light shielding plate.
Prevent the light from the light emitting section 1 from directly hitting the subject. 200 is a strobe of this system, 201 is its light emitting part, and 202 is its light receiving part. 300 is a subject, and 400 is a camera body. A signal from a camera release operation, such as the closing of an X contact, causes the wireless dimming controller 100 to emit a first light, followed by a second light emission' after a preset time in the -t light emitting section 101.

The strobe 200 uses the light receiving section 202 to confirm two consecutive light emissions from the light emitting section 101 at a predetermined time interval, and causes the light emitting section 201 to emit light to illuminate the subject. controller 10
The light receiving unit 102 of No. 0 receives the reflected light from the subject, performs photoelectric conversion, integrates the amount of reflected light, and emits the third light when a predetermined value is reached. This strobe 200 receives this light with its light receiving section 202, confirms the third light emission, and stops the light emission of the light emitting section 201.

FIG. 2 shows an example of the structure of the light emitting section 101 of the controller 100. The light emitting unit 101 emits light from a transparent or white window. In front of it is a light shielding section 103 that prevents the light from the light emitting section 101 from directly hitting the subject. Light emission is performed by a discharge tube 104 inside the window.

FIG. 3 also shows an example of another structure of the light emitting section 101. The window has a transparent cover, and the inner wall above it is a reflector with a highly reflective coating (105).

FIG. 4 is an example of an implementation circuit of the wireless dimming controller 100. 1 is the power supply, 2 is the power switch, 5" is the DC-
It is a DC converter.

The discharge tube 17 is attached to the light emitting section 101 shown in FIG.
5 is the trigger coil, 20 is the first main capacitor,
34 is a second main capacitor, 47 is a third main capacitor, 4 is a neon tube, 51 is a light receiving element (light receiving section 102 shown in FIG. 1), 50 is a conventional light control circuit, 56 is a camera body ( In the camera 400 shown in FIG. 1, 53 is an X contact in the camera, 55 is a light control circuit in the camera 56, and the light receiving element 54 receives the light transmitted through the objective lens of the camera. The DC-DC converter 5'' starts boosting the voltage by closing the main switch 2, supplies the boosted voltage to the line L1, charges the first main capacitor 20, and charges the first main capacitor 20 through the entire diode 33. 34 and the third main capacitor 47 through the diode 46.Resistors 32 and 45 charge the first to third main capacitors 47 through these resistors.
The charging voltages of the main capacitors are set to approximately the same value. When charging is completed, a current flows through the resistor 3, the neon tube 4, and the resistor 5, and the neon tube lights up to indicate the completion of charging, and at the same time, the capacitor 6 is charged to a predetermined voltage. Transistor 8 and 5CR13,) Rigger coil 15
, resistor 7.9.10.12, capacitor 11.14.1
6 constitutes a trigger circuit. When the first main capacitor 20 is fully charged, the capacitor 14 is connected to the primary of the trigger coil through the positive of the first main capacitor 20, through the diode 19 and the resistor 18 connected in parallel with it, through the resistor 12, and through the capacitor 14. It is charged through the winding and through GND. When the X contact 53 in the camera 56 is closed, the base current of the transistor 8 flows through the resistors 52 and the transistor 8 becomes conductive. The capacitor 6 is charged to a predetermined voltage, and its discharge current is 5C.
At the same time as the current flows into the gate of R13, the dimming circuit 50
sends a signal to start operation.

When the 5CRI 3 receives the discharge current of the capacitor 6 at all gates, it becomes conductive, the capacitor 14 is discharged, and a current flows to the primary side of the trigger coil 15. -f:n'fc A high voltage is generated on the secondary side of the trigger coil 150 to trigger the discharge tube 17. Current flows from the first main capacitor 20 to the discharge tube 17 and a first light emission occurs.

At this time, 5CR31 and 44 are out of conduction, and the second
And the charge of the third main capacitor is not discharged.

Immediately after the first light emission ends, the potential of the line L2 becomes the low voltage left by the first main capacitor 20. The capacitor 23 is charged through the Zener diode 21 and the resistor 22 when charging of the first main capacitor 20 is completed. After the first light emission, the potential of the line L2 has dropped, so the capacitor 23 starts to fully discharge, and the discharge current passes through the resistor 22 and flows from the Zener diode 21 to the line L2.
2, a Zener voltage is generated across the Zener diode 21. PUT 26.5CR to this voltage
31, resistor 2'4.25.27.29, capacitor 28
．． The operation of the delay circuit composed of 30 is started.

Resistors 2 and 25 connected in series, and resistor 27 and capacitor 28 similarly connected in series are each connected in parallel to the Zener diode 21.1. PUT26
Its gate is connected to the midpoint of resistors 24 and 25, and its anode is connected to the midpoint of resistor 27 and capacitor 2B, and capacitor 28 is charged across resistor 27, and its potential is When the threshold voltage determined by the gate voltage divided by is reached, the PUT 26 becomes conductive, discharging the capacitor 28, and causing the entire current to flow through the gate of the 5CR31, making the 5cR31 conductive. When 5CR31 is turned ON, current flows from the main capacitor 34 to the primary capacitor of the trigger coil 15 through the capacitor 16 and discharge tube 17.
is triggered, the discharge current of the second capacitor 34 flows through the discharge tube 17, and a second light emission occurs. The time interval between the first and second light emission is determined by the threshold voltage of the delay circuit;
It is set by the time constant of capacitor 28 and resistor 27.

In response to the first and second light emissions, the strobe 200 in FIG. 1 emits light to illuminate the subject. The reflected light is received by the light receiving element 51 of the wireless dimmer controller, and the dimmer circuit 50 starts integrating the amount of light. When a predetermined amount of light is reached, the dimmer circuit 50 turns the switch 48 high and outputs a bell signal.

When the switch 48 is closed to the 48-a side, the output of the dimmer circuit 50 causes current to flow into the gate of 5CR41 and S
CR41 becomes conductive. Immediately before 5CR41 becomes conductive, capacitor 37 connects resistors 36 and 3 in parallel with it.
It is discharged by series resistor 8, and capacitor 3
9 is discharged by a resistor 40 connected in parallel with it, and its potential is a residual voltage (approximately 50 V) comparable to that of the first main capacitor 20 via the resistor 18. 5C
When R41 is non-conductive, the gate and cathode of 5CR44 are at the residual voltage. When 5CR41 becomes conductive, one end of the capacitor 39 connects to GN through 5CR41.
D, the cathode potential of the 5CR44 falls below the gate potential, and the SCR44 becomes conductive. The diode 35 is inserted to prevent a charging current from flowing from the line L2 to the capacitor 39. When 3CR44 becomes conductive, the third main capacitor 477Jx, 5CR44, diode 35
A current flows through the line L2, and a third light emission is triggered by the discharge tube 17Vi in the same way as the second light emission. The strobe 200 side confirms the third light emission and stops its own light emission.

If the camera itself has a built-in function (TTL dimming circuit) that receives all of the reflected light from the subject through the lens, integrates the light intensity, and sends a strobe light emission stop signal when a predetermined light intensity is reached, switch 4B. By switching to 'e48-bllI, TTL dimming control is possible.

Note that the n1scR parallel circuits 10, 11, 29, 30, 42, and 43 inserted into the gate circuits of each SCR function as noise filters.

Next, in combination with this wireless dimmer controller, flash light emission can be controlled. Explain about strobes.

FIG. 5 shows the circuit configuration of the strobe 200 of the dimming control system of the present invention. The circuit A within the dotted line is a light emitting section, and the circuit B within the dotted line is a control section.

In the light emitting section A, 1' is a power supply, 2' is a main switch, 3' is a DC-DC converter, 4' is a main capacitor, 5' is a discharge tube (corresponding to the light emitting section 201 in Fig. 1), 6
' is a neon tube, 11' is a trigger coil, 8', 14'
, 20'U SCR. When the main switch 2' is closed, the DC-DC converter 3' boosts the voltage of the power supply 1' and outputs it. Eliminate main capacitor 4' for boost voltage
is charged, and when the charging voltage reaches the dischargeable voltage of the discharge tube 5', the neon tube 6' is turned on via the resistor 7' to indicate the completion of charging. The boost voltage fully charges the commutation capacitor 18' through the path of the resistor 19', the commutation capacitor 18', and the resistor 17', and also charges the primary coil of the resistors 19', 9', the trigger capacitor 10', and the trigger coil 11'. The trigger capacitor 10' is charged along the route. 5C
R8', 14', 2.0' gate circuit resistor 12',
16', 22' and capacitors 13', 15', 21
' is for noise removal. The gates of the SCRs 8', 14', and 20' are connected to the control section B via resistors 24', 23', and 80'.
energized by a signal from Now, for example, the strobe 20G receives the first and second light emission from the wireless dimming controller, and the gates of the SCRs 8' and 14' are energized by the light emission start pulse signal generated by the controller B.
Assume that CR8' and CR14' are electrically connected.

The charge of the trigger capacitor 10' is the primary coil, 5
A discharge occurs in the loop of CR8', and the discharge tube 5' is triggered by the induced voltage on the secondary side of the trigger coil 11'. At this time, SCR14' is conducting, so main capacitor 4'
The charging voltage causes the discharge tube 5' to discharge and emit light.

This light emission is maintained for a period corresponding to the amount of charge of the main capacitor 4'. After that, when the SCR 20' is made conductive by the light emission stop pulse signal from the control unit B, the positive side potential of one electrode of the charged commutation capacitor 18' is grounded, so the potential of the other electrode is Negatively biased S
The conduction state of CR14' is cut off and discharge is stopped.

Next, the control signal B will be explained.
It consists of 0 to 1100.

501 is a light receiving element for detecting light emission from the wireless dimming controller.

500 is an AC amplifier, which amplifies the output of the light receiving element 501. The low frequency gain of the amplifier is kept small so that it does not output in response to gradual changes in brightness under normal conditions, and in response to sudden changes in brightness generated by the wireless dimmer controller. It is an AC amplifier that can obtain a predetermined gain. 60
0 is a first timer circuit, 700Fi is a first switching circuit, 800 is a delay circuit, 900 is a second timer circuit, 1000 is a second switching circuit, and 1100 is a third switching circuit. For example, when the light receiving element 501 receives light from the wireless dimming controller 100, the output of the AC amplifier 500 becomes Lo level.
It shall output a signal that returns to the old level when the wireless dimmer controller stops emitting light. The first light emission from the wireless dimming controller 100 causes the output ViH of the AC amplifier 500! LOl level changes from
The first stop of light emission causes the level to change from the LOl level to the Hl level. LO1 level of the output of the AC amplifier 500 to Hl
In response to the change in level, the first timer circuit 600 is triggered and supplies power to the first switching circuit 700 for a predetermined period T1.

The second light emission of the wireless dimming controller 100 is designed to occur within this period of T1, and the first switching circuit 700 normally outputs an LO level output, but at the time of the second light emission, the AC amplifier 500 outputs an Hl level output. Lol from the level
Upon receiving a signal whose level changes, it outputs an Hl level signal and connects it to 5CR8' and 5CRI via resistor 701e.
4'k is made conductive and light emission starts.

However, if the second light emission of the wireless dimming controller 100 does not occur within the energization period Tl of the first timer circuit, the power supply to the first switching circuit 700 has been cut off, so the output No signal is generated and the present strophore 200 does not emit light. First switching circuit 70
The output of 0 goes to the delay circuit 800 and the second timer circuit 9
Transmitted to 00. The second timer circuit 900 is triggered by the output of the switching circuit 700 of the rear cylinder 1 for a delay time T3 by the action of the delay circuit 800, and continues for a certain period T2.
000 and the third switching circuit 1100. This period T2 is set to be sufficiently longer than the strobe light emission time. The second switching circuit 1000
When power is supplied from the timer circuit 900, its output potential i LOL/bevel is reduced, and a signal at the Hl level is not applied to the gates of 5CR8' and SCR14' again during period T2. This is because it is conceivable that the first switching circuit 700 outputs a Hi level signal when the wireless dimming controller 100 emits the third light. The third switching circuit 1100 is energized for a period T2 after the second light emission of the wireless dimming controller 100, and when the wireless dimming controller 100 emits the third light, the output level of the AC amplifier 500 is at the Hl level. When it detects that the Lol level changes from 5CR2 to
0' becomes conductive and the strobe 200 stops emitting light.

The delay time T3 is set to a time such that the third switching circuit 1100 does not respond to the output of the AC amplifier 500 during the second light emission of the wireless dimming controller 100. That is, during the second light emission of the wireless dimming controller 100, the output of the AC amplifier 500 changes from the Hil level to the LO1 level at the rise of the light emission, but while this change is occurring, the output of the AC amplifier 500 remains at 1.
0 is the third switching circuit 110 because power is not supplied from the timer circuit 900 for the delay circuit 800.
0 does not work. In this example, the strobe 200
detects that the first and second light emissions of the wireless dimmer controller 100 have occurred within a predetermined period, starts emitting light, and then starts the third light emission of the wireless dimmer controller 100.
The light emission stops when the light is emitted.

FIG. 6 shows the operation timing of the circuit of FIG. 5. (a) shows the first, second, and third light emission waveforms of the wireless dimming controller 100.

(b) is the 7-node potential of the light receiving element 501, (C) is the output waveform of the AC amplifier 500, and (d) is the first timer 60.
0 output voltage waveform. (e) is the output voltage of the first switching circuit 700 and is the gate activation pulse of 5CR8', 14'. (f) is the output voltage waveform of the second timer circuit 900. (g) is the output voltage of the third switching circuit 1100 and is the gate activation pulse of the SCR 20'. (h) is a light emission waveform of the strobe 200.

To explain the series of operations using FIGS. 5 and 6, at the fall of the first light emission of the wireless dimming controller, the output of the AC amplifier 500 changes from the LO level to the H level, and the output of the first timer circuit changes from the LO level to the H level. 600 starts operating, followed by the first
Power is supplied to the switching circuit 700 of. At the rise of the second light emission of the wireless dimming controller 100, the output of the AC amplifier 500 changes from Hi level to LO level, the first switching circuit 700 is activated, and the strobe 2
00 starts emitting light. The second timer circuit 900 is activated by the second and third switching circuits 1000 .
1100. At the start of the third light emission of the wireless dimming controller 100, the third switching circuit 1100 is activated and the light emission of the discharge tube 5' is stopped.

FIG. 7 shows a more specific circuit configuration of the control section B in the circuit diagram of FIG. 5. In FIG. Since the light emitting section A is the same as the circuit shown in FIG. 5, a description thereof will be omitted.

The interlocking switches 74' and 75' are 74La and 7, respectively.
When switched to the 5'-a side (second position), the strobe 200 operates under the control of the wireless dimming controller 100.

The light receiving element 31' (corresponding to 501 in Fig. 5) has a resistor 25'.
, 27', a capacitor 29', a diode 26', and a transistor 28'. When the light-receiving element 31' receives normal light that is not generated by the wireless dimmer controller, the photocurrent flows from the anode of the light-receiving element 31' through the collector and emitter of the transistor 28' to the cathode side of the light-receiving element 31'. flows into. When a relatively gradual change in brightness occurs due to normal light, for example, when the light becomes brighter and the photocurrent increases, the collector current of the transistor 28' increases, causing the collector-emitter voltage V to increase. E rises and diode 2
The anode potential of transistor 28' increases, the base current of transistor 28' increases, and the collector current increases.
. . suppress the rise in Also, when it gets dark, the light receiving element 31'
When the current in transistor 28' decreases, the collector current of transistor 28' decreases to V. 0 becomes low, the anode potential of the diode 26' decreases, and the base current of the transistor 28' decreases, so that V
. I'm holding back F from going down. In this way, the bias circuit constitutes negative feedback, and compresses the anode potential of the light receiving element 31' over a wide illuminance range. A capacitor 29' is connected between the base and emitter of the transistor 28' to reduce the response speed of the feedback loop, which responds well to slow brightness changes under normal light, but does not respond well to the wireless dimmer controller's light emission. The anode potential of the light-receiving element 31' changes greatly.

a capacitor 30' connected to the anode of the light receiving element 31';
Resistors 32', 33', 34' and transistor 35'
constitutes an AC amplifier circuit 500. Its output appears at the collector of transistor 35'. capacitor 36'
Resistors 37', 38' and transistors 39', 44', 46' connected through the resistors 4, 42', 43'
, 45', 47' and capacitors 40', 4B'u first
Configure a timer circuit. When the collector of the transistor 35' changes from the LO level to the Hi level, the charging current of the capacitor 36' flows into the base of the transistor 39', and once the transistor 39' becomes conductive, the charging current of the capacitor 40' flows into the resistor 41'. The current flows through the base of the transistor 44' and becomes the base current of the transistor 44', thereby making the transistor 44' conductive. Current flows from the collector of the transistor 44' through the resistor 45' to the base of the transistor 46', making the transistor 46' conductive. After transistor 46' becomes conductive, transistor 39'
OFF, the charging current of capacitor 40' continues to flow to the collector-emitter of transistor 46', and transistors 44' and 46' continue to conduct until charging is complete. During that period T1, the capacitor 40' and the resistor 4
It is approximately determined by the value of 1'. This period T1 is set to be slightly longer than the time interval between the first light emission and the second light emission of the controller 100. The collector of transistor 44' supplies power to the next first switching circuit 700. The first switching circuit 700 has resistors 49' and 51
', a transistor 50', and a capacitor 52'. The first switching circuit 700 has a timer period T
1, when the collector potential of transistor 35' changes from H level to LO level, it turns ON and transistor 5'
0' is conductive and 5 resistors 53' (resistance 7o1 in FIG. 5),
5CR8' and SCR14' via 23', 24'i
is made conductive, and the discharge tube 5' starts emitting light.

Also, a Hi level signal is transmitted to the next delay circuit 800. Resistor 68' and capacitor 69' and delay circuit 800
is composed of n. Delay circuit 800f'i: Fully conducts transistor 64' after a delay time T3 determined by resistor 68' and capacitor 69'.

Transistors 64', 65', resistors 60', 61', 6
2', 66', 67', and capacitor 63' constitute a second timer circuit 900. First switching circuit 6
00 is turned on, after a delay of T3, the transistor 65' becomes conductive, and the subsequent second and third switching circuits 1
Current is supplied to 000.1100. The energization period T2 during which the second timer circuit 900 is activated is set to be sufficiently longer than the light emission time of the discharge tube 5'.

Transistor 79' and resistors 77' and 78' constitute a second switching circuit 1000.

When the second timer circuit 900 is activated, the transistor 7
9' is conductive and dropped to the gate line i GND of SCR8' and 5CR14', so that a HI level signal is not transmitted again to the gates of SCR8' and SCR14' when the wireless dimming controller 100 emits the third light. do. Transistor 72', resistors 70', 71'.

The capacitor 73' constitutes the third switching circuit 100. When the collector potential of the transistor 35' changes from Hi level to LO level, the transistor 721
t/-i conduction, the SCR 20''e conducts through the resistor 80' and the a side of the switch 75', and the light emission of the discharge tube 5' is stopped.

The second timer circuit 900 is connected to the first switching circuit 7
00 turns on after a time delay of T3, so if the time constants of the resistor 71' and capacitor 73' are set to be shorter than the delay time T3, the third switching circuit 1100 will turn on after the time delay of T3.
It does not respond when the second light emission starts, and operates only when the third light emission starts. The second control means of the present invention corresponds to part numbers 500 to 1100 in the embodiment.

In the embodiment shown in FIG. 7, 76' is a conventional dimming circuit, and when the strobe 200 shown in FIG. (first position) When the X contact 81' of the camera is closed, the transistor 84' becomes conductive, and the resistors 53', 23', 2
A current flows to the gates of 5CR8' and SCR14' through 4' and is triggered by the discharge tube 5''K, which starts emitting light.The light receiving element 31' photoelectrically converts the reflected light, and the light control circuit (first control means) When the transistor 65' becomes conductive, the 76' receives the signal and integrates the amount of light, and when a predetermined amount of light is reached, transmits a signal to the gate of the SCR 20' through b4 of the switch 75' to completely stop light emission.

The resistors 56', 57', 58', the capacitor 59', and the transistors 54', 55' are malfunction prevention circuits, and when the power switch 2' is closed, the circuit shown in FIG. 5 generates noise when the power is turned on. etc. 5CR8', 14'
, 20' are held at the LO level for a certain period of time after the power is turned on.

FIG. 8 is an enlarged view of the light receiving section 202 shown in FIG. 1, and shows a method of mounting the light receiving element 31'. The light-receiving section has a light-receiving element 31' that has directivity, and is rotatable so that the light-receiving element 31' intensively captures the light emitted from the wireless dimming controller. In this way, the light receiving section selectively receives only the light emitted from the wireless dimming controller, suppresses the influence of the light emitted by the strobe 200, and can operate normally. Light receiving section 20
2 is integrated with a rotating member 203 and sandwiches the strobe case of this strobe 200, so that it can rotate freely.

FIG. 9 is a view seen from arrow A in FIG.
If 2 faces the front of the strobe, switch 74' and 75'
This is an embodiment in which the light falls into the notch of the rotating member 203 and is automatically switched to the b side, thereby making it possible to switch to a conventional dimming strobe. The switching means of the invention correspond in the embodiment to the rotary member 203 and the switches 74', 75'. If you do this, when you attach the strobe 200' to the camera and use it as a normal dimming strobe, when you point the light receiving part toward the subject, it will automatically switch to a normal dimming strobe, so it is a good idea to have a special switch. , it is possible to prevent erroneous operations. Further, 204 is designed to come into contact with a part of the stopper 203 to prevent the cord from the light receiving element 31' from becoming too tight.

Therefore, according to the embodiment, by removing the light receiving part of the slave strobe from the entire front and facing the light emitting part of the wireless dimming controller, it is possible to accurately receive the light emission start and stop signals. , it becomes possible to wirelessly control and emit light from a slave strobe set far away from the camera.

It is also possible to set a normal automatic light control strobe (master strobe) in place of the wireless light control controller, so that the slave strobe responds to the master strobe's firing and stopping of light emission.

As described above, according to the present invention, there is no need for a cord for all connections between strobes, and it is possible to avoid complications and accidents caused by cords.

Further, the strobe of the present invention can be automatically switched to a conventional autoflash control flash by turning the light receiving means to the first position, allowing normal autoflash photography, and when the light receiving means is turned to the second position. When the wireless strobe is turned on, it is automatically switched to the wireless strobe for multiple flashes, which has the advantage that multiple flash photography can be reliably performed without operating the wireless strobe for multiple flashes.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a wireless dimming control system using a wireless strobe according to the present invention. Second
3 and 3 are diagrams showing the structure of the light emitting source of the controller. FIG. 4 is a circuit diagram of an embodiment of the wireless strobe controller of the present invention. FIG. 5 is a circuit diagram of an embodiment of the wireless strobe of the present invention. FIG. 6 is a diagram showing output waveforms in the circuit operation of FIG. 5. FIG. 7 is a circuit diagram showing a specific configuration of the process shown in FIG. 5. FIG. 8 is a diagram showing the structure of a light receiving element of a strobe. 9th
The figure is a diagram showing the structure of the light receiving element structure of FIG. 8 viewed from arrow A, and shows the structure of the light receiving element structure and the related switches. [Explanation of symbols of main parts] Light receiving means 202 First control means 76' Second control means 500 to 1100 Third
Figure 5 Figure 6 Figure 7 C Figure 8 Figure q

Claims (1)

[Scope of Claims] A light receiving means provided to be displaced to a first position in the irradiation direction of the strobe and a second position displaced by a predetermined angle from the first position, and responsive to a photoelectric conversion output from the light receiving means. and a first control means for controlling the stop of light emission of the strobe when the photoelectric conversion output reaches a predetermined amount, and a first control means for controlling the light emission stop of the strobe when the photoelectric conversion output reaches a predetermined amount, and detecting a change in the photoelectric conversion output in response to the photoelectric conversion output from the light receiving means. a second control means for controlling light emission and stop of light emission; and a second control means for controlling the light receiving means when the light receiving means is in the first position, and a second control means for controlling the light receiving means when the light receiving means is in the second position in conjunction with the displacement of the light receiving means. A wireless strobe for multiple flashes, characterized in that the wireless strobe further comprises a switching means for causing the second control means to respond to the photoelectric conversion output.