JPH10123593A - Automatic light adjusting stroboscopic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic light adjusting stroboscopic device capable of detecting light emitted by other devices and starting its own light emitting operation, and also, setting/controlling the emitted light quantity of a light source with high accuracy, without being affected by a trigger noise. SOLUTION: A start-up photodetecting sensor 50 for detecting the light emitted by other devices is arranged at a position where the light emitted by itself can be detected, and the supply of a driving power 17 to a light emission control means 18 for controlling the emitted light quantity of the light source 3 based on the photodetection output of the sensor 50 is controlled. Thus, the automatic light adjusting stroboscopic device capable of supplying the power in perfect synchronism with the real light emitting operation and highly accurately controlling the emitted light quantity is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting control means for controlling at least a light emitting operation of a light source by receiving a reflected light from a subject, and starting a light emitting operation of itself by detecting light emission of another strobe device. The present invention relates to an automatic light control strobe device provided with a light emission start means for causing the light emission control means to supply a drive power to the light emission control means.

[0002]

2. Description of the Related Art Conventionally, a light measuring section including a light receiving sensor for light control for receiving reflected light from a subject and a control section for controlling a light emitting operation of a light source based on an output of the light measuring section are provided. Various types of so-called automatic light control strobe devices having a light emission control unit for controlling a light emission operation based on the flash device are well known, and in recent years, the light emission operation of another flash device has been detected to detect its own light emission operation. An automatic light control strobe device having a light emission start means for starting light emission has been put to practical use.

[0003] In addition, the above-described configuration for supplying drive power to the light emission control means is generally designed so that when the light emission control means itself does not emit light, it receives reflected light from a subject accompanying light emission of another strobe device and does not operate. There are various known supply configurations. For example, Japanese Utility Model Publication No. 59-43678 discloses a configuration in which a driving power supply voltage is supplied to a light emission control unit as shown in FIG. An electronic flash device is disclosed.

[0004] The configuration of FIG. 2 will be briefly described. First, when a DC high voltage is supplied between terminals A and B from a DC high-voltage power supply (not shown) such as a DC-DC converter circuit or a laminated power supply, The capacitor 1 is charged, and at the same time, the capacitors 5, 9 are also charged to the respective resistance values of the resistors 6, 7, 8 and the voltage value defined by the breakover voltage of the Zener diode 10.

When the well-known trigger circuit 2 operates in a state where the main capacitor 1 and the like have been charged, the flash discharge tube 3 as a light source is excited. At the same time that the light is emitted by consuming the charged charge of
The discharge is performed through the path of the flash discharge tube 3, the Zener diode 10 for regulating the charging voltage of the capacitor 9, and the resistors 8 and 7.

For this reason, the light emitted from the flash discharge tube 3 is emitted toward a subject (not shown), and the transistor 11 is turned on by the voltage drop of the resistor 8 due to the discharge of the capacitor 5. That is, the charge of the capacitor 9 is supplied as drive power to the light emission control means 4 via the transistor 11 by the conduction of the transistor 11.

That is, the charge control unit 4 is supplied with the charge of the capacitor 9 serving as a driving power source unless the flash discharge tube 3 starts the light emission operation by the excitation operation of the flash discharge tube 3 by the trigger circuit 2. As a result, as a result, the light emission control means 4 does not operate in response to the reflected light from the subject accompanying the light emission of another strobe device when it does not emit light.

[0008]

However, when the operation of supplying the charge of the capacitor 9 to the light emission control means 4 as described above is microscopically observed, there are still the following disadvantages. For example, looking at the drive power supply to the light emission control means 4, that is, the supply timing of the charge of the capacitor 9, the above-described supply operation is a discharge operation of the capacitor 5 through the flash discharge tube 3, that is, an operation including a so-called transient phenomenon. Is performed, the characteristics from the excitation by the trigger circuit 2 of the flash discharge tube 3 to the actual start of light emission and the resistance value ratio of the resistors 7 and 8 are greatly affected. In this case, the supply timing is greatly affected by individual characteristics of the flash discharge tube 3 and the resistors 7 and 8.

For this reason, in consideration of manufacturing variations such as resistance values existing in the flash discharge tube 3 and the resistors 7 and 8, the supply timing based on the light emission operation of the flash discharge tube 3 is determined for each individual. It is conceivable that the strobe device fluctuates easily. On the other hand, the variation in the supply timing of the driving power supply to the light emission control means 4 may cause a variation in the light emission amount set by the control of the light emission operation of the flash discharge tube 3 thereafter. As a result, as a result, the above-described configuration of supplying the driving power to the light emission control means 4 has a disadvantage that it is disadvantageous in terms of high-precision light emission control.

The discharge operation of the capacitor 5 for supplying drive power to the light emission control means 4 via the flash discharge tube 3 and the conduction operation of the transistor 11 accompanying the discharge operation are performed by the trigger circuit 2. The light emission control means 4 has a disadvantage that the light emission control means 4 may be erroneously operated under the influence of the trigger noise generated by the operation of the trigger circuit 2.

The present invention has been made in view of the above-mentioned disadvantages, and completely synchronizes the timing of supplying drive power to the light emission control means with the start of light emission of the light source which is a flash discharge tube. The supply time can be controlled with high accuracy without variation in individual strobe devices, and thus the light emission amount set by the light emission control means by the light emission control of the flash discharge tube can be set with high accuracy and without being affected by trigger noise. It is an object to provide an automatic light control strobe device that can be controlled.

[0012]

SUMMARY OF THE INVENTION In order to solve this problem, the present invention comprises at least a dimming light-receiving sensor for receiving light reflected from a subject accompanying a light-emitting operation of a light source. Light emission control means for controlling the light emission operation of the light source based on the amount of the reflected light received, and a start-up light-receiving sensor for receiving light emission of another device, and light emission of the other device by the start-up light-receiving sensor. And a light emission start means for operating the trigger circuit of the light source by detecting the start of the light source. Supply of drive power to the light emission control means can be started by the light reception output of the light reception sensor, and at the time of operation of the light emission control means, the operation of the light emission activation means is prevented and During operation of the starting means it is obtained by forming the automatic light flash device includes control means for preventing operation of the light emission control means regardless of the supply state to the light emission control means of the drive power source.

Thus, the operation of supplying the drive power to the light emission control means is started completely in synchronization with the actual light emission operation of its own light source. It is possible to control with high accuracy without variation in the device, and as a result, it is possible to set and control the light emission amount set by the light emission control means by the light emission control of the flash discharge tube with high accuracy and without being affected by trigger noise. Thus, it is possible to provide an automatic light control strobe device capable of performing this.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention includes at least a dimming light-receiving sensor for receiving light reflected from a subject accompanying a light-emitting operation of a light source. A light emission control unit that controls a light emission operation of the light source based on an amount of the reflected light received, and a start-up light-receiving sensor that receives light emission of another device, and emits light of the other device by the start-up light-receiving sensor. An automatic light control strobe device comprising: a light emission start means for detecting and operating a trigger circuit of the light source, wherein the light receiving sensor for activation is arranged at a position capable of receiving light emission of the light source, Supply of drive power to the light emission control means can be started by the light reception output of the sensor, and when the light emission control means is operated, the operation of the light emission start means is prevented, and In operation, an automatic dimming strobe device is provided with control means for preventing the operation of the light emission control means regardless of the state of supply of the drive power to the light emission control means. Can be started completely in synchronization with the actual light emission operation of its own light source, so that the supply time of the drive power can be controlled with high precision without variation in individual strobe devices. Having.

According to a second aspect of the present invention, a control means in the automatic light control strobe device according to the first aspect is provided.
A switch unit disposed between the light emission control unit and the drive power supply of the light emission control unit, and setting a state of supplying the drive power supply to the light emission control unit by operating with the light receiving output of the start light receiving sensor. In the operation of the light emission control means, the operation of the trigger circuit by the light receiving output of the activation light receiving sensor is prevented, and when the light emission activation means operates, the light emission control means is set to the non-operation state regardless of the operation state of the switch means. This is configured to include an operation inhibiting means for controlling, and has the same operation as the invention according to the first aspect.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. (Embodiment 1) FIG. 1 is an electric circuit diagram showing an embodiment of an automatic light control strobe device according to the present invention.
2 have the same functional configuration. In this embodiment, a light emitting operation state includes a manual state in which no control is performed on the light emitting operation, a so-called auto state in which reflected light from a subject is received to control the light emitting operation, and other strobe devices. It is assumed that three types of light emission operation states, that is, a so-called slave state in which the light emission operation of the device itself is detected and its own light emission operation is performed, can be set.

The main capacitor 1 of the present embodiment starts operating when the power switch 13 is closed, and outputs a diode 15 at the output of the DC-DC converter circuit 14 which boosts the terminal voltage of the supplied DC low-voltage power supply 12. It is made to be charged through. At both ends of the DC low-voltage power supply 12,
A capacitor 17 serving as a drive power source for a light emission control unit 18 described later is connected via a diode 16.

FIG. 18 shows light emission control means for controlling the light emission operation of the flash discharge tube 3 based on the reflected light from a subject (not shown) accompanying the light emission of the flash discharge tube 3, and receives the reflected light. Light control sensor 20 for dimming, integrating capacitor 2
1, resistors 22, 23, 24 and the integrating capacitor 21
Metering section 19 including a transistor 25 or the like, which is a switch element whose on / off operation is controlled in accordance with the state of charge of
For example, a control switch element 27 which is an insulated gate bipolar transistor which is connected in series with the flash discharge tube 3 and performs on / off operation, a transistor 28 for controlling the operation of the control switch element 27, resistors 29 and 30, and a transistor 25 The transistor 28 operates in response to the operation.
And a control unit 26 comprising an SCR 31 and the like for controlling the operation of.

FIG. 32 shows a trigger circuit for exciting the flash discharge tube 3, which is charged via a trigger capacitor 33, a trigger transformer 34, an SCR 35, a diode 16, and a resistor 38 and constitutes a drive system of the SCR 35. 36, a transistor 37, resistors 39, 40 and 41, a synchro contact 42 and the like. Figure number 43
Denotes a drive circuit which includes a resistor 44 and a Zener diode 45 and supplies an operating voltage of the control switch element 27.

FIG. 46 shows a capacitor 1 as a driving power supply.
And switch means for setting the state of supplying the charged charge of the capacitor 17 to the light emission control means 18 by operating with the light receiving output of the starting light receiving sensor 50 described later. , Transistor 4
7, a resistor 48 and the like. FIG. 49 shows an automatic dimming strobe device according to the present invention, not shown, which is disposed on an external housing of the strobe device according to the present invention, so as to receive the light emitted from another strobe device not shown or the light emitted from the flash discharge tube 3. SCR of start-up light receiving sensor 50 and trigger circuit 32
And a photoelectric conversion circuit 51 having an output terminal 51a that is connected to the gate 35 and outputs a photoelectric conversion signal that indicates when the activation light-receiving sensor 50 receives the emitted light. .

Reference numeral 52 denotes an operation state setting means for selecting and setting the three types of the above-mentioned auto state, manual state, and slave state, and includes a contact piece 53a connected to the ground G, the contact piece 53a And an electrically floating contact 53b connected in the automatic state, a contact 53c connected to the gate of the SCR 31 connected in the manual state, and a contact 53d connected to the high potential side of the capacitor 36 connected in the slave state. It is provided with, for example, an operation switch 53 provided manually and a diode 54 for connecting the contacts 53c and 53d in the forward direction.

FIG. 55 shows a control circuit for controlling the operation of the switch means 46 and the trigger circuit 32 based on the operations of the light emission start means 49 and the operation state setting means 52, and the photoelectric conversion output outputted by the photoelectric conversion circuit 51. And a transistor 56 for turning on and receiving and controlling the transistor 47 of the switch means 46 to an on state, a main electrode between the output terminal 51a of the photoelectric conversion circuit 51 and the ground G, and a control electrode for the contact 53d. It is connected and is configured to include a transistor 57 and the like that are turned off only in the slave state and allow the photoelectric conversion output to be supplied to the trigger circuit 32.

Next, the light emission control operation and the like in the automatic light control strobe device of the present embodiment having the above-described configuration will be described. For convenience of explanation, the operation will be described for each light emitting operation state, and first, a case will be described in which an automatic state in which the contact piece 53a of the operation switch 53 of the operation state setting means 52 is connected to the contact point 53b is set.

When the power switch 13 is closed, the DC low-voltage power supply 12 is supplied to the DC-DC converter circuit 14, so that the DC-DC converter circuit 14 starts operating. The main capacitor 1 and the trigger capacitor 33 are charged with the high voltage obtained by increasing the terminal voltage of the terminal 12, and at the same time, the drive voltage is supplied to the gate of the control switch element 27 via the drive circuit 43.

The DC low-voltage power supply 12 is connected to the power switch 1
3. The power is supplied to the capacitor 17 via the diode 16, and the capacitor 17 is also charged. Furthermore, since the contact 53b is electrically floating in the auto state, the high-potential side terminal of the capacitor 36 is also connected to the DC low-voltage power supply 12 via the power switch 13, so that the capacitor 36 is also charged. Will be.

The high-potential terminal of the capacitor 36 is connected to the base of the transistor 57 via the resistors 58 and 59, so that when the capacitor 36 is charged to a certain extent, the transistor 57 is rendered conductive. Will be. When the synchro contact 42 is closed in a state where the capacitors are charged, the capacitor 3
6 is discharged via the resistor 39 and the synchro contact 42, the transistor 37 is turned on by the voltage drop across the resistor 39, and the charge of the capacitor 36 is turned on by the conduction of the transistor 37. The SCR 31 is discharged via the resistors 37 and 40 and 41, and the SCR 31 is turned on by the drop voltage generated in the resistor 41.

When the SCR 31 is turned on, the charge of the trigger capacitor 33 is released through the SCR 31 and the trigger transformer 34, and the flash discharge tube 3 is excited by the high voltage generated by the trigger transformer 34, whereby the flash discharge tube 3 is discharged.
Emits light by consuming the charge of the main capacitor 1, and emits the emitted light toward the subject. At the same time, the light emitted from the flash discharge tube 3 is received by the light-receiving sensor 50 for activation, so that the photoelectric conversion circuit 51 outputs a photoelectric conversion output from its output terminal 51a, thereby turning on the transistor 56.

At this time, the photoelectric conversion output from the output terminal 51a is also transmitted to the gate of the SCR 35 of the trigger circuit 32. However, the transistor 57 is in the automatic state and the transistor 57 is in the conductive state as described above. Therefore, the signal is bypassed to the ground G via the transistor 57, that is, the photoelectric conversion output does not operate the trigger circuit 32.

When the transistor 56 is turned on, the transistor 47 of the switch means 46 is also turned on, so that the charge of the capacitor 17 is supplied as drive power to the photometric unit 19 of the light emission control means 18 via the transistor 47. become. That is, in the present embodiment, when the driving power is supplied to the light emission control means 18 at the same time as the flash discharge tube 3 actually emits light, the photometry unit 19 is in an operating state, and reflected light from a subject (not shown) is emitted. The light is received by the light receiving sensor 20 for dimming, and the integrating capacitor 21 is charged according to the amount of the received light.

When the charging voltage value of the integrating capacitor 21 reaches a predetermined voltage value set in advance, the transistor 25 is turned on, and the path of the DC low voltage power supply 12, the diode 16, the transistors 47 and 25, and the resistors 23, 29 and 30. Current flows through the transistor 28 and SC
R31 becomes conductive. When the transistor 28 is turned on, the gate and the cathode of the control switch element 27 are short-circuited, so that the control switch element 27 is turned off, thereby stopping the light emission of the flash discharge tube 3.

At this time, the collector potential of the control switch element 27 sharply rises and then gradually falls to the 0 level. In this process, the SCR 31 causes the transistor 28 to pass through a resistor (not shown). , The conduction of the transistor 28 is maintained until the collector potential drops to substantially zero level, whereby the control switch element 27 also maintains the non-conductive state.

Thereafter, when the collector potential disappears, SC
R31 returns to the non-conductive state, the short circuit between the gate and cathode of the control switch element 27 is released, and the device returns to the initial state before the trigger circuit 32 operates. Further, when the light emission of the flash discharge tube 3 is stopped due to the non-conduction state of the control switch element 27, the light reception by the starting light receiving sensor 50 is also stopped, and the output from the output terminal 51a of the photoelectric conversion circuit 51 is stopped. , Transistor 5
6 and the transistor 47 of the switch means 46 return to the non-conductive state, whereby the supply of the charge of the capacitor 17 to the light emission control means 18 is also stopped.

Next, a case where the manual state in which the contact piece 53a of the operation switch 53 of the operation state setting means 52 is connected to the contact point 53c will be described. In this case, as is apparent from FIG. 1, the configuration which is different from the above-mentioned auto state is that the gate of the SCR 31 of the control unit 26 is connected to the ground G by the connection between the contact piece 53a and the contact 53c. Only.

Accordingly, the flash discharge tube 3 emits light by the operation of the trigger circuit 2, and the emitted light is used as the starting light-receiving sensor 5.
Even if the transistor 47 of the switch means 46 is turned on by receiving light at 0, the transistor 25 of the photometry unit 19 is turned on by receiving the reflected light from the subject (not shown) by the light receiving sensor 20 for light control. , SCR3
1 is never made conductive.

That is, the contact piece 53a of the operation switch 53
In the manual state in which is connected to the contact 53c,
The operation of the control unit 26 in which the SCR 31 is turned on and the transistor 28 is turned on to short-circuit between the gate and the cathode of the control switch element 27 is not performed. As a result, when the flash discharge tube 3 starts emitting light, the light emission starts. The operation is not controlled in the middle, and the light emission continues until the charge of the main capacitor 1 is consumed.

In this manual state, as in the previous automatic state, the transistor 57 is made conductive by the capacitor 36. Therefore, the starting light receiving sensor 50 is connected to the output terminal 51a of the photoelectric conversion circuit 51.
The photoelectric conversion output output in response to the light reception of the
Is not supplied to the gate of the SCR 35. Finally, the contact piece 5 of the operation switch 53 of the operation state setting means 52
The case where the slave state where 3a is connected to the contact 53d is set will be described.

In this case as well, as is clear from FIG.
The point at which the gate of the SCR 31 of the control unit 26 is connected to the ground G is via the diode 54 but is the same as in the manual mode. Therefore, even if the photoelectric conversion circuit 51, the photometric unit 19, and the like operate, the SCR 31 is included. The operation of the control unit 26 is not performed. When the flash discharge tube 3 emits light, the light emission continues until the charged charge of the main capacitor 1 is consumed.

However, unlike the automatic state and the manual state, the high-potential side terminal of the capacitor 36 is connected to the resistor 58, the contact piece 52a of the operation switch 53, and the contact 53.
d, the capacitor 36 is connected to the ground G. Therefore, when the power switch 13 is closed, the capacitor 36
Unlike the auto state and the manual state, the resistance 38
And the resistor 58 is charged based on the ratio of the respective resistance values. If the battery has already been charged, the charge is transferred via the resistor 58 so as to have a voltage value based on the resistance value ratio. Will be released.

Therefore, the resistance 38 of the capacitor 36
And the charging voltage value based on the resistance value ratio of the resistor 58, the voltage value at which the transistor 37 cannot be turned on even when the synchro switch 42 is closed, or the transistor 37 is turned on but the resistors 40, 41 By setting and controlling the ratio of the resistance values of the resistors 40 and 41 so that the divided voltage value is lower than the gate voltage of the SCR 35, the sync switch 4
2, the state in which the trigger circuit 32 does not operate can be set, and of course, the present embodiment is so configured.

That is, in the slave state, the automatic light control strobe device of the present embodiment cannot operate the trigger circuit 32 when the synchro contact 42 is closed. Further, the base of the transistor 57 is also connected to the ground G via a resistor (not shown) and the contact piece 53a and the contact 53d.
Therefore, the transistor 57 is maintained in a non-conductive state without being turned on.

As a result, unlike the previous auto state and manual state, the starting light-receiving sensor 50 receives light emitted from another strobe device, and the photoelectric conversion circuit 51 outputs a photoelectric conversion output from its output terminal 51a. Then, the photoelectric conversion output is sent to the S of the trigger circuit 32 via the diode 60.
The SCR is supplied to the gate of the CR 35
35 will be conducted.

When the SCR 35 of the trigger circuit 32 is turned on, the excitation operation of the flash discharge tube 3 is performed in accordance with the discharge of the trigger capacitor 33, as described in the above-mentioned auto state, whereby the flash discharge tube 3 emits light. Will do. As described above, in the light emission operation of the flash discharge tube 3 in the slave state, the gate of the SCR 31 of the control unit 26 is connected to the ground G, and the photoelectric conversion circuit 51, the photometry unit 19, and the like operate. However, since the operation of the control unit 26 is not performed, the light emission is continued until the charge of the main capacitor 1 is consumed.

[0043]

According to the present invention, an automatic light control strobe device is provided.
In order to operate a trigger circuit of a light source in response to light emission of another device, a starting light receiving sensor for receiving light emission of another device is disposed at a position capable of receiving light emission of its own light source. Since the drive power supply to the light emission control means is started by the light receiving output of the light source, the operation of supplying the drive power supply to the light emission control means can be started completely in synchronization with the actual light emission operation of the own light source. Therefore, the supply time of the drive power can be controlled with high accuracy without variation in each strobe device, and as a result, the light emission amount set by the operation of the light emission control means is highly accurate and is affected by trigger noise. It has the effect that it can be set and controlled without the need.

[Brief description of the drawings]

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

FIG. 2 is an electric circuit diagram of the electronic flash device described in Japanese Utility Model Publication No. 59-43678.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main capacitor 3 Flash discharge tube 12 DC low voltage power supply 13 Power switch 14 DC-DC converter circuit 15 Diode 16 Diode 17 Capacitor 18 Light emission control means 19 Photometry unit 20 Light control light sensor 21 Integral capacitor 22 Resistance 23 Resistance 24 Resistance 25 Transistor Reference Signs List 26 Control part 27 Control switch element 28 Transistor 29 Resistance 30 Resistance 31 SCR 32 Trigger circuit 33 Trigger capacitor 34 Trigger transformer 35 SCR 36 Capacitor 37 Transistor 38 Resistance 39 Resistance 40 Resistance 41 Resistance 42 Synchro contact 43 Drive circuit 44 Resistance 45 Zener diode 46 Switch means 47 Transistor 48 Resistance 49 Light emission start means 50 Light receiving sensor for starting 51 Photoelectric conversion circuit 52 Operating state setting means 53 Operation switch Pitch 54 diode 55 control circuit 56 transistor 57 transistor 58 resistor 59 resistor 60 diode

Claims (2)

[Claims] 1. A light-adjusting light-receiving sensor for receiving at least reflected light from a subject accompanying a light-emitting operation of a light source, and the light-emitting operation of the light source based on an amount of the reflected light received by the light-adjusting light-receiving sensor. Light emission control means for controlling the light emission of the other device, and light emission start means for operating the trigger circuit of the light source by detecting light emission of the other device by the light reception sensor for activation. An automatic dimming strobe device comprising: a start light receiving sensor disposed at a position capable of receiving light emitted from the light source; Supply can be started, the operation of the light emission starting means is prevented when the light emission control means is operated, and the light emission control means of the driving power supply is operated when the light emission starting means is operated. Automatic light flash device characterized by comprising a control means for inhibiting the operation of said light emission control means regardless of the supply condition to the. 2. The control means is disposed between the light emission control means and a drive power supply of the light emission control means, and supplies the drive power supply to the light emission control means by operating with a light receiving output of a start light receiving sensor. Switch means for setting a state to be activated, and preventing operation of a trigger circuit by a light receiving output of the light-receiving sensor for activation when the light emission control means operates, and setting the light emission control means to the switch means when the light emission activation means operates. 2. An automatic light control strobe device according to claim 1, further comprising an operation inhibiting means for controlling the operation to a non-operation state regardless of the operation state.