WO2011058738A1 - ストロボ用の調光回路、及びこれを用いたストロボ装置と撮像装置 - Google Patents
ストロボ用の調光回路、及びこれを用いたストロボ装置と撮像装置 Download PDFInfo
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- WO2011058738A1 WO2011058738A1 PCT/JP2010/006582 JP2010006582W WO2011058738A1 WO 2011058738 A1 WO2011058738 A1 WO 2011058738A1 JP 2010006582 W JP2010006582 W JP 2010006582W WO 2011058738 A1 WO2011058738 A1 WO 2011058738A1
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- light
- voltage
- light emission
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B15/00—Special procedures for taking photographs; Apparatus therefor
- G03B15/02—Illuminating scene
- G03B15/03—Combinations of cameras with lighting apparatus; Flash units
- G03B15/05—Combinations of cameras with electronic flash apparatus; Electronic flash units
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B7/00—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly
- G03B7/16—Control of exposure by setting shutters, diaphragms or filters, separately or conjointly in accordance with both the intensity of the flash source and the distance of the flash source from the object, e.g. in accordance with the "guide number" of the flash bulb and the focusing of the camera
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/30—Circuit arrangements in which the lamp is fed by pulses, e.g. flash lamp
- H05B41/32—Circuit arrangements in which the lamp is fed by pulses, e.g. flash lamp for single flash operation
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B2215/00—Special procedures for taking photographs; Apparatus therefor
- G03B2215/05—Combinations of cameras with electronic flash units
Definitions
- the present invention relates to a light control circuit for a flash that adjusts the amount of light emitted from a flash discharge tube, and a flash device and an imaging device using the same.
- the conventional flash device is provided with a light control circuit to adjust the amount of light emitted from the flash discharge tube.
- this light control circuit for strobe light the reflected light reflected from the subject during flash light emission is received by the semiconductor light receiving element and photoelectrically converted into a photocurrent.
- the light intensity of the photoelectrically converted photocurrent is integrated by the voltage integrator.
- the integrated voltage value of the voltage integration unit is compared by the voltage comparison unit with a reference voltage value corresponding to the photocurrent obtained by photoelectrically converting the light emission amount of the emission light suitable for the subject. Then, the voltage comparison unit outputs a light emission stop signal when the integrated voltage value exceeds the reference voltage value.
- the light adjustment circuit for the strobe outputs a light emission stop signal when the light emission amount of the light emission light of the flash discharge tube reaches the light emission amount of the light emission light suitable for the subject.
- the flash discharge tube stops the strobe light emission.
- a light receiving element such as a photodiode or a phototransistor which causes a photocurrent to flow according to the light intensity of the incident light is used.
- the semiconductor light receiving element takes a short time for the reflected light reflected from the subject. Receive a large amount of light. Therefore, the current amount of the photocurrent photoelectrically converted by the semiconductor light receiving element increases in a short time. Then, the integral voltage value reaches a reference voltage value indicating that the appropriate light emission amount has been reached for a short time. However, at this time, the amount of luminescence of the luminescence light actually emitted by the flash discharge tube is smaller than the amount of luminescence of the luminescence light as compared to that at the time of normal photographing.
- the flash light adjustment circuit needs correction means for correcting the reference voltage value to be a voltage value suitable for photographing at a short distance or the like and at the time of normal photographing.
- the integral voltage value As means for correcting the reference voltage value, for example, as in Patent Document 1, the integral voltage value generates a predetermined voltage from the start of light emission of the flash discharge tube, and then the integral voltage value gradually rises There is a flash light control device which is set to reach a reference voltage value.
- the flash light control device can eliminate an excessive error in the light emission amount at the time of shooting such as at a short distance.
- the applicant of the present application has already proposed a dimmer for a strobe provided with a plurality of voltage integrating units configured to perform voltage integration at different voltage rising speeds.
- the light control device for strobes emits the strobe light before a predetermined time set in advance from the start of light emission and when the integrated voltage value by the voltage integration unit with a fast voltage increase rate reaches the reference voltage value
- the reference voltage value is switched so that the strobe light emission is stopped when a predetermined time has elapsed and when the integrated voltage value by the voltage integration unit with a slow voltage increase rate reaches the reference voltage value.
- the trigger voltage generated when the trigger voltage is applied to the flash discharge tube causes the integration voltage value to be excited in order to excite the gas in the flash discharge tube.
- Noise components may occur or the voltage may fluctuate.
- the integral voltage value may temporarily exceed the rising reference voltage value. Then, when the integrated voltage value temporarily exceeds the reference voltage value, the voltage comparison unit responds to this and outputs a light emission stop signal, which may cause the light emission of the flash discharge tube to stop.
- the voltage integration unit is switched according to the passage of time from the start of light emission. Therefore, in this flash light adjustment circuit, the characteristic curves of the time difference (for example, 5 ⁇ sec or more and 10 ⁇ sec or less) for switching and the integrated voltage and the integrated voltage amount derived from the elapsed time become discontinuous. Then, if the light emission stop control is overlapped at the time of switching, an error may occur depending on which of the characteristic curves of different voltage integration units is adopted.
- the present invention has been made in consideration of the above problems, and provides a light control circuit for a strobe that can improve the light control accuracy for each light emission and photographing condition, and a strobe device using the same.
- a light control circuit for a strobe includes a light receiving element for generating a photocurrent according to the intensity of reflected light reflected from an object, a voltage integration unit for integrating the voltage of the photocurrent from the light receiving element, and A dimmer circuit for a strobe including a voltage comparison unit that compares a voltage of a voltage integration unit with a reference voltage, and further includes a current ratio variable unit that outputs a variable current to the voltage integration unit according to the passage of light emission time. It has the composition of.
- the current ratio variable unit increases the variable current.
- the integral voltage can accelerate the rate of voltage rise.
- the current ratio variable unit reduces the variable current when the light emission and photographing conditions require a normal light emission amount.
- the light adjustment circuit for strobe can adjust the light emission amount of the light emission for each of the light emission and photographing conditions only by changing the variable current by the current ratio variable unit.
- the light control circuit for a strobe does not need to set the reference voltage value for each light emission and photographing condition, and can reduce an error associated with switching of the reference voltage value for each light emission and photographing condition.
- the strobe device of the present invention is configured to include a light adjustment circuit for a strobe and a light emitting element for emitting emitted light.
- the strobe device does not need to set the reference voltage value for each of the light emission and photographing conditions, and can reduce an error associated with switching of the reference voltage value for each of the light emission and the photographing conditions.
- the imaging device of the present invention is configured to include a strobe device, an imaging element, and an optical system for imaging.
- the present invention can improve the light control accuracy for each of the light emission and photographing conditions.
- FIG. 1 is a schematic circuit diagram of a strobe device according to a first embodiment of the present invention.
- FIG. 2 is a circuit diagram of a dimmer circuit for a flash in the first embodiment of the present invention.
- FIG. 3A is a graph showing changes in the photocurrent of the semiconductor light receiving element and the added current of the current ratio variable portion in the first embodiment of the present invention.
- FIG. 3B is a graph showing a change in integrated voltage of the voltage integration unit and a timing of the output of the light emission stop signal in the first embodiment of the present invention.
- FIG. 4A is a graph showing changes in the photocurrent of the semiconductor light-receiving element and the added current of the current ratio variable portion in the second embodiment of the present invention.
- FIG. 4B is a graph showing a change in integrated voltage of the voltage integration unit and a timing of an output of the light emission stop signal in the second embodiment of the present invention.
- FIG. 5 is a front view showing an outline of a strobe device in Embodiment 3 of the present invention.
- FIG. 6 is a front view showing an outline of an imaging device in a fourth embodiment of the present invention.
- FIG. 1 is a schematic circuit diagram of a strobe device 30 according to a first embodiment of the present invention.
- the strobe device 30 includes a power supply battery 1, a power switch 2, a booster circuit 3, a main capacitor 4, a flash discharge tube 5, an IGBT 6, a trigger capacitor 7, and a trigger transformer 8.
- a light emission stop circuit 9 and a light emission control circuit 10 are provided.
- the power supply battery 1 supplies power to the strobe device 30, and the power supply switch 2 switches the power supply battery 1 on and off.
- the booster circuit 3 boosts the terminal voltage of the power source battery 1 to a DC high voltage, and the main capacitor 4 is charged with the DC high voltage output from the booster circuit 3.
- the flash discharge tube 5, which is one of the light emitting elements is connected to both ends of the main capacitor 4 and emits light.
- the IGBT 6 controls the flash discharge tube 5 on and off, and the trigger capacitor 7 and the trigger transformer 8 excite the flash discharge tube 5.
- the light emission stop circuit 9 stops the light emission of the flash discharge tube 5, and the light emission control circuit 10 outputs the drive voltage of the IGBT 6 and the light emission stop circuit 9.
- the light emission stop circuit 9 includes an off transistor 11 and a light control circuit 12.
- the off transistor 11 is connected between its collector C and emitter E between the gate G and emitter E of the IGBT 6 to turn off the IGBT 6.
- the dimmer circuit 12 is connected to the base B of the off transistor 11 and outputs a light emission stop signal according to the amount of light emitted from the flash discharge tube 5.
- the light emission control circuit 10 is connected to both ends of the main capacitor 4.
- the light emission control circuit 10 outputs the drive voltage of the IGBT 6 from the first terminal 10A and the drive voltage of the light emission stop circuit 9 from the second terminal 10B.
- the light emission control circuit 10 also receives a light emission start signal at the input terminal 10C.
- a light emission start signal is supplied to the input terminal 10C of the light emission control circuit 10. Then, the light emission control circuit 10 outputs the drive voltage of the IGBT 6 from the first terminal 10A and the drive voltage of the light emission stop circuit 9 from the second terminal 10B.
- the IGBT 6 is turned on, and at the same time, the trigger capacitor 7 discharges through the trigger transformer 8 to excite the flash discharge tube 5, whereby the flash discharge tube 5 consumes the charge of the main capacitor 4 and irradiates it.
- the off transistor 11 when the light emission stop signal is outputted to the off transistor 11 based on the light emission amount of the light emission light reflected from the subject, the off transistor 11 is turned on. Then, the gate G to the emitter E of the IGBT 6 are short-circuited. Therefore, the IGBT 6 is turned off, and the light emission of the flash discharge tube 5 is stopped.
- FIG. 2 is a circuit diagram of the dimmer circuit 12 for a flash in the first embodiment of the present invention.
- the light adjustment circuit 12 is a light receiving element that generates a photocurrent Ip according to the intensity of the reflected light reflected from the subject, for example, the semiconductor light receiving element 13, a current ratio variable unit 14, and a voltage integration unit 15 (for example, integration And a reference voltage generation unit 16 and a voltage comparison unit 17.
- the current ratio variable unit 14 outputs the variable current Ia according to the elapse of the light emission time
- the voltage integration unit 15 outputs the photocurrent Ip from the semiconductor light receiving element 13 and the variable current from the current ratio variable unit 14 Voltage integration is performed based on Ia.
- the reference voltage generation unit 16 outputs a reference voltage Vref as a reference with respect to the integrated voltage Vint
- the voltage comparison unit 17 compares the integrated voltage Vint with the reference voltage Vref.
- the semiconductor light receiving element 13 is a light receiving element such as a photodiode or a phototransistor that causes a photocurrent Ip to flow according to the light intensity of the reflected light reflected from the subject. That is, the semiconductor light receiving element 13 is a light receiving element capable of photoelectrically converting the light emission light received into the electric signal according to the light intensity.
- the current ratio variable unit 14 is connected to the second terminal 10 B of the light emission control circuit 10. Then, the current ratio variable unit 14 starts operation in response to the light emission start signal input from the light emission control circuit 10. First, the current ratio variable unit 14 adds a predetermined current (here, the addition current Iadd) to the photocurrent Ip input from the semiconductor light receiving element 13 according to the passage of time from the reception of the light emission start signal. The variable current Ia is output.
- a predetermined current here, the addition current Iadd
- FIG. 3A is a graph showing changes in the photocurrent of the semiconductor light receiving element and the added current of the current ratio variable portion in the first embodiment of the present invention.
- FIG. 3B is a graph showing a change in integrated voltage of the voltage integration unit and a timing of the output of the light emission stop signal in the first embodiment of the present invention.
- the current ratio variable unit 14 starts operation by the light emission start signal.
- the point of time when the current ratio variable unit 14 receives the light emission start signal is set as the origin.
- the photocurrents Ip1 and Ip2 are indicated by broken lines, and the added current Iadd is indicated by a solid line.
- the photocurrent Ip1 is a photocurrent photoelectrically converted by the semiconductor light receiving element 13 based on the reflected light received at the time of shooting such as near distance. That is, it is when the light emission amount becomes appropriate with a small amount (for example, at the time of small light emission).
- the photocurrent Ip2 is a photocurrent photoelectrically converted by the semiconductor light receiving element 13 based on the reflected light received at the time of normal photographing. That is, it is time to be appropriate without correcting the light emission amount (for example, at the time of normal light emission).
- the current ratio variable unit 14 adds a predetermined current (for example, an addition to the photocurrents Ip1 and Ip2 generated by the semiconductor light receiving element 13 receiving the reflected light according to the passage of time from the reception of the light emission start signal).
- a variable current Ia obtained by adding the current Iadd) is output.
- the current ratio variable unit 14 is connected to the second terminal 10B of the light emission control circuit 10.
- the addition current Iadd is supplied from the second terminal 10B of the light emission control circuit 10.
- the current ratio variable unit 14 After the start of operation, the current ratio variable unit 14 outputs, to the voltage integration unit 15, the addition current Iadd that is larger than the photocurrent Ip from the semiconductor light receiving element 13. Then, the addition current Iadd output from the current ratio variable unit 14 decreases with the passage of time, and becomes constant at a predetermined current value.
- a time difference until the IGBT 6 that controls the response delay of the semiconductor light receiving element 13 or the light emission of the flash discharge tube 5 is turned off.
- the current ratio variable unit 14 is connected as a current source. Then, a variable current Ia obtained by adding a predetermined addition current Iadd to the photocurrent Ip generated according to the light intensity of the reflected light received by the semiconductor light receiving element 13 is input to the voltage integration unit 15.
- the voltage integration unit 15 uses an integration capacitor that integrates the voltage of the variable current Ia from the current ratio variable unit 14, and adds the addition current Iadd of the current ratio variable unit 14 to the photocurrent Ip of the semiconductor light receiving element 13. Voltage integration is performed by charging the current Ia.
- the rate of increase in voltage of the integrated voltage is different depending on the amount of the input variable current Ia. For example, at the time of small light emission, the voltage increase rate is high, such as the integrated voltage Vint1 of FIG. 3B. In addition, during normal light emission, the voltage increase rate is lower than that during small light emission, and becomes as in the integrated voltage Vint2 of FIG. 3B.
- the reference voltage generation unit 16 outputs the reference voltage Vref to one input terminal Vin + of the voltage comparison unit 17.
- the reference voltage Vref is determined to be the same value as the integral voltage Vint when the flash discharge tube 5 has an appropriate light emission amount.
- the reference voltage Vref output by the reference voltage generator 16 is a constant value.
- the voltage comparison unit 17 is a comparator that compares two input signals that are input and inverts the output according to the comparison result.
- the reference voltage Vref is input to one input terminal (inverted input terminal) Vin + of the voltage comparison unit 17 when the output terminal of the reference voltage generation unit 16 is connected.
- the integration voltage Vint is input to the other input terminal (non-inversion input terminal) Vin ⁇ of the voltage comparison unit 17 as the voltage integration unit 15 is connected. Specifically, it is connected between the voltage integration unit 15 and the current ratio variable unit 14.
- the voltage comparison unit 17 outputs the output terminal Vout.
- the potential of V does not invert to the high level while remaining at the low level.
- the integral voltage Vint input from the other input terminal Vin ⁇ reaches a predetermined reference voltage Vref input from one input terminal Vin +
- the potential of the output terminal Vout is inverted from the low level to the high level.
- the off transistor 11 is turned on.
- the operation of the light control circuit 12 configured as described above will be described.
- the IGBT 6 is turned on, and the flash discharge tube 5 starts light emission.
- the light emitted from the flash discharge tube 5 is reflected from the subject and is incident on the semiconductor light receiving element 13.
- a photocurrent Ip is generated according to the light intensity of the reflected light incident on the semiconductor light receiving element 13.
- the generated photocurrent Ip is input to the current ratio variable unit 14.
- a variable current Ia obtained by adding a predetermined addition current Iadd to the photocurrent Ip according to the elapsed time since the reception of the light emission start signal is And the voltage comparison unit 17.
- the voltage integration unit 15 integrates the voltage of the variable current Ia input from the current ratio variable unit 14. Then, the integrated voltage Vint of the voltage integration unit 15 is applied to one input terminal Vin ⁇ of the voltage comparison unit 17.
- the addition current Iadd added from the current ratio variable unit 14 outputs to the voltage integration unit 15 more variable current Ia than the photocurrent Ip from the semiconductor light receiving element 13 when the light emission start signal is output.
- the variable current Ia in which the addition current Iadd is added to the photocurrent Ip generated by the semiconductor light receiving element 13 is integrated at a time when the time lapse is short after the start of light emission, so the integral voltage Vint rises rapidly.
- the flash discharge tube 5 stops light emission at the light emission peak when the amount of small light emission is an appropriate amount of light emission.
- the light emission stop signal can be output immediately before the desired light emission amount is reached, and the time difference can be absorbed. It becomes.
- variable current Ia in which the addition current Iadd decreases with the passage of time is set to have a constant current value after the passage of a predetermined time. Therefore, in the case of the normal proper light emission amount, the increase of the addition current Iadd becomes constant from the predetermined elapsed time. Therefore, unlike the time of small light emission, the light emission stop signal can be output with a desired light emission amount.
- the small amount of light emission is an appropriate amount of light emission
- the amount of light emitted to the semiconductor light receiving element 13 per unit of time is large, and thus the generated photocurrent Ip1 is large.
- the addition current Iadd added by the current ratio variable unit 14 is also large at the initial stage of light emission. Therefore, the characteristic curve of the time / integral voltage Vint1 sharply rises at the beginning of light emission and becomes a curve that reaches a reference voltage Vref for a short time.
- the light emission amount incident on the semiconductor light receiving element 13 is small per time unit, or time is required until the incident (the distance to the object is long and the time difference before the reflected light is incident) Can reduce the photocurrent Ip2 generated. Therefore, the characteristic curve of the time / integral voltage Vint2 rises sharply at the beginning of light emission, but since the addition current Iadd decreases with the passage of time, the curve gradually becomes a gradual rise curve.
- the current ratio change unit 14 outputs the variable current Ia to the voltage integration unit 15 so that the photographing distance is short.
- the integration voltage Vint of the voltage integration unit 15 is made variable according to the light emission and imaging conditions such as when the imaging sensitivity is high and the steady light is relatively strong. As a result, the time until the integral voltage Vint reaches the reference voltage Vref can be made variable. Therefore, the light adjustment circuit 12 for strobe can perform stable light adjustment control without considering the switching of the characteristic curve of the time / integrated voltage Vint and the time loss at the time of switching.
- the flash light control circuit of the present invention includes a light receiving element that generates a photocurrent according to the intensity of reflected light reflected from an object, a voltage integration unit that integrates the voltage of the photocurrent from the light receiving element,
- the electronic flash light control circuit includes a voltage comparison unit that compares the voltage of the voltage integration unit with a reference voltage, and further includes a current ratio variable unit that outputs a variable current to the voltage integration unit as light emission time elapses. It has the composition of.
- the current ratio variable unit increases the variable current.
- the integral voltage can accelerate the rate of voltage rise.
- the current ratio variable unit reduces the variable current when the light emission and photographing conditions require a normal light emission amount.
- the current ratio variable unit is configured to adjust the variable current in accordance with the photocurrent generated by the light receiving element.
- the current ratio variable unit varies the variable current amount according to the increase degree of the photocurrent generated by the light receiving element. As a result, it is possible to adjust the time taken for the integrated voltage value to reach the reference voltage value, and it is possible to more precisely adjust the light emission amount of the emitted light.
- FIG. 4A is a graph showing changes in the photocurrent of the semiconductor light-receiving element and the added current of the current ratio variable portion in the second embodiment of the present invention.
- FIG. 4B is a graph showing a change in integrated voltage of the voltage integration unit and a timing of an output of the light emission stop signal in the second embodiment of the present invention.
- the strobe device according to the second embodiment is obtained by changing the current ratio variable unit 14 of the light adjustment circuit 12 for a strobe according to the first embodiment, and the configuration other than that is shown in FIG. 1 and FIG. Is the same as Therefore, the same parts as those of the first embodiment except for the current ratio variable unit 14 are given the same reference numerals, and the description will be omitted.
- the current ratio variable unit 14 When the incident amount of the reflected light to the semiconductor light receiving element 13 is large, that is, when the light emission amount becomes appropriate with a small amount of light (in the small light emission), the current ratio variable unit 14 according to the second embodiment The current Ip1 rises rapidly. Due to this, the addition current Iadd1 is output in accordance with the photocurrent Ip1. Then, the addition current Iadd1 decreases its current decrease rate symmetrically to the current increase rate of the photocurrent Ip1.
- the incident amount of the reflected light to the semiconductor light receiving element 13 is appropriate, that is, when the current ratio variable portion 14 is appropriate without correcting the light emission amount (normal light emission time)
- the photocurrent Ip2 rises at a normal current rise rate.
- the current ratio variable unit 14 outputs the added current Iadd1 in accordance with the photocurrent Ip2, as in the small light emission.
- the addition current Iadd2 decreases its current decrease rate symmetrically to the current increase rate of the photocurrent Ip2.
- the speed at which the addition currents Iadd1 and Iadd2 are decreased may be varied according to the rate of increase of the photoelectric flow based on a reference table stored in advance in a memory or the like.
- the decrease speed of the added currents Iadd1 and Iadd2 is varied.
- the rate of decrease of the added current Iadd is varied.
- the strobe device according to the second embodiment is obtained by changing the current ratio variable unit 14 of the light adjustment circuit 12 for a strobe according to the first embodiment. Therefore, the same parts as those of the first embodiment except for the current ratio variable unit 14 are given the same reference numerals, and the description will be omitted.
- the current ratio variable unit 14 changes the current path of the photocurrent Ip in the reverse direction of the arrow Ip described in FIG.
- the IGBT 6 is turned on, and the flash discharge tube 5 starts light emission.
- the emitted light emitted from the flash discharge tube 5 is reflected from the subject and is incident on the semiconductor light receiving element 13, and the semiconductor light receiving element 13 generates a photocurrent Ip according to the light intensity of the incident reflected light.
- the current ratio variable unit 14 measures the photocurrent Ip generated by the semiconductor light receiving element 13, and according to the photocurrent Ip, the amount of current of the photocurrent Ip corresponds to the elapsed time since the light emission start signal is received.
- a predetermined addition current Iadd is added, and is output to the voltage integration unit 15 and the voltage comparison unit 17 as a variable current Ia.
- variable current Ia output from the current ratio variable unit 14 is output to the voltage integration unit 15 as a variable current Ia larger than the output of the photocurrent Ip from the semiconductor light receiving element 13 when the light emission start signal is output.
- variable current Ia in which the addition current Iadd is added to the photocurrent Ip generated by the semiconductor light receiving element 13 is integrated at a time when the time lapse is short after the start of light emission, so the integral voltage Vint rises rapidly.
- the flash discharge tube 5 stops light emission at the light emission peak when the amount of small light emission is an appropriate amount of light emission.
- the light adjustment circuit for a flash according to the present invention and the flash device using the same are not limited to the above embodiments, and various modifications can be made without departing from the scope of the present invention. is there.
- the current ratio variable unit 14 describes an example in which the addition current Iadd decreases to a predetermined current amount with respect to the current increase of the photocurrent Ip, the present invention is not limited thereto. That is, the addition current Iadd may be reduced to 0A.
- FIG. 5 is a front view showing an outline of a strobe device in Embodiment 3 of the present invention.
- the strobe device 40 according to the third embodiment includes the light adjustment circuit 41 for the strobe according to the first or second embodiment and a light emitting element 42 for emitting light.
- the time until the reference voltage is reached can be adjusted to the time that can ensure the light emission amount of the light emission light, and it is possible to realize a strobe device capable of improving the light control accuracy for each light emission / photographing condition.
- FIG. 6 is a front view showing an outline of an imaging device in a fourth embodiment of the present invention.
- the imaging device 50 according to the fourth embodiment is configured to include a strobe device 40, an imaging element 51, and an optical system 52 for imaging.
- the time until the reference voltage is reached can be adjusted to the time in which the emitted light amount of the emitted light can be secured, and an imaging device capable of improving the light control accuracy for each of the light emitting and photographing conditions can be realized.
- a light adjustment circuit for a strobe according to the present invention and a strobe device using the same have the improvement of the light adjustment accuracy for each light emission and photographing condition, and adjust the light emission amount of the emission light emitted by the flash discharge tube It is useful as a light control circuit for strobes, a strobe apparatus using the same, and the like.
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Abstract
Description
まず、本発明の実施の形態1であるストロボ装置の概略構成について、図1を参照しつつ、説明する。図1は、本発明の実施の形態1におけるストロボ装置30の概略回路図である。
次に、本発明の実施の形態2のストロボ装置について、図4Aおよび図4Bを参照しつつ、説明する。図4Aは、本発明の実施の形態2における、半導体受光素子の光電流及び電流比率可変部の加算電流の変化を示すグラフである。図4Bは、本発明の実施の形態2における、電圧積分部の積分電圧の変化と、発光停止信号の出力のタイミングを示すグラフである。なお、本実施の形態2に係るストロボ装置は、実施の形態1に係るストロボ用の調光回路12の電流比率可変部14を変更したものであり、それ以外の構成は、図1および図2と同様である。よって、電流比率可変部14以外の、実施の形態1と同様の部分については、同一の符号をふるとともに、説明を省略する。
図5は、本発明の実施の形態3におけるストロボ装置の概略を示す正面図である。図5に示すように、本実施の形態3のストロボ装置40は、実施の形態1または2のストロボ用の調光回路41と発光光を照射する発光素子42と、を備えた構成としている。
図6は、本発明の実施の形態4における撮像装置の概略を示す正面図である。図6に示すように、本実施の形態4の撮像装置50は、ストロボ装置40と、撮像素子51と、撮像用の光学系52と、を備えた構成としている。
2 電源スイッチ
3 昇圧回路
4 主コンデンサ
5 閃光放電管(発光素子)
6 IGBT
7 トリガコンデンサ
8 トリガトランス
9 発光停止回路
10 発光制御回路
10A 第1端子
10B 第2端子
10C 入力端子
11 オフトランジスタ
12,41 調光回路
13 半導体受光素子
14 電流比率可変部
15 電圧積分部
17 電圧比較部
30,40 ストロボ装置
42 発光素子
50 撮像装置
51 撮像素子
52 光学系
Claims (4)
- 被写体から反射された反射光の強さに応じた光電流を生成する受光素子と、前記受光素子からの光電流を電圧積分する電圧積分部と、前記電圧積分部の電圧と基準電圧とを比較する電圧比較部とを備えるストロボ用の調光回路において、発光時間の経過に応じて、電圧積分部に可変電流を出力する電流比率可変部を更に備えることを特徴とするストロボ用の調光回路。
- 前記電流比率可変部は、前記受光素子が生成する光電流に応じて、可変電流を調整する請求項1記載のストロボ用の調光回路。
- 請求項1又は請求項2のいずれか1項に記載のストロボ用の調光回路と、発光光を照射する発光素子と、を備えたことを特徴とするストロボ装置。
- 請求項3に記載のストロボ装置と、撮像素子と、撮像用の光学系と、を備えたことを特徴とする撮像装置。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/503,742 US20120218465A1 (en) | 2009-11-16 | 2010-11-10 | Illumination adjustment circuit for flash, flash device and image capture device using same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009260592A JP2011107292A (ja) | 2009-11-16 | 2009-11-16 | ストロボ用調光回路、及びこれを用いたストロボ装置 |
JP2009-260592 | 2009-11-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2011058738A1 true WO2011058738A1 (ja) | 2011-05-19 |
Family
ID=43991407
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2010/006582 WO2011058738A1 (ja) | 2009-11-16 | 2010-11-10 | ストロボ用の調光回路、及びこれを用いたストロボ装置と撮像装置 |
Country Status (4)
Country | Link |
---|---|
US (1) | US20120218465A1 (ja) |
JP (1) | JP2011107292A (ja) |
KR (1) | KR20120094478A (ja) |
WO (1) | WO2011058738A1 (ja) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
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KR102286955B1 (ko) * | 2019-09-23 | 2021-08-06 | 김태화 | 머신비전용 led 조명 장치의 하이브리드 디밍 제어장치 |
Citations (10)
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JPS4887829A (ja) * | 1972-02-19 | 1973-11-17 | ||
JPS54131840U (ja) * | 1979-03-01 | 1979-09-12 | ||
JPS55113525U (ja) * | 1979-02-02 | 1980-08-09 | ||
JPS5810728A (ja) * | 1981-07-14 | 1983-01-21 | Kyocera Corp | 自動調光制御回路 |
JPS62178223A (ja) * | 1986-01-31 | 1987-08-05 | Kyocera Corp | 閃光発光装置の調光回路 |
JPH01172821A (ja) * | 1987-12-28 | 1989-07-07 | Stanley Electric Co Ltd | 自動調光機能を有するフラッシュ発光装置 |
JP2002099031A (ja) * | 2000-09-25 | 2002-04-05 | Fuji Photo Film Co Ltd | ストロボ装置 |
JP2002352993A (ja) * | 2001-05-28 | 2002-12-06 | Fuji Photo Film Co Ltd | ストロボ装置 |
JP2003330077A (ja) * | 2002-05-16 | 2003-11-19 | Nikon Corp | 閃光装置 |
JP2007003898A (ja) * | 2005-06-24 | 2007-01-11 | Stanley Electric Co Ltd | ストロボ装置 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3875471A (en) * | 1974-01-18 | 1975-04-01 | Berkey Photo Inc | Photoflash source control circuit |
US4531078A (en) * | 1983-10-27 | 1985-07-23 | Polaroid Corporation | Control circuit for electronic flash |
US6009280A (en) * | 1993-08-05 | 1999-12-28 | Minolta Co., Ltd. | Flash light amount controlling apparatus |
JPH11119289A (ja) * | 1997-10-17 | 1999-04-30 | Nikon Corp | 自動調光装置 |
US6788892B2 (en) * | 2002-06-06 | 2004-09-07 | Fuji Photo Film Co., Ltd. | Strobe light-emission control apparatus |
JP2007232864A (ja) * | 2006-02-28 | 2007-09-13 | Nikon Corp | 閃光装置の発光制御回路 |
-
2009
- 2009-11-16 JP JP2009260592A patent/JP2011107292A/ja active Pending
-
2010
- 2010-11-10 US US13/503,742 patent/US20120218465A1/en not_active Abandoned
- 2010-11-10 WO PCT/JP2010/006582 patent/WO2011058738A1/ja active Application Filing
- 2010-11-10 KR KR1020127010678A patent/KR20120094478A/ko not_active Application Discontinuation
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4887829A (ja) * | 1972-02-19 | 1973-11-17 | ||
JPS55113525U (ja) * | 1979-02-02 | 1980-08-09 | ||
JPS54131840U (ja) * | 1979-03-01 | 1979-09-12 | ||
JPS5810728A (ja) * | 1981-07-14 | 1983-01-21 | Kyocera Corp | 自動調光制御回路 |
JPS62178223A (ja) * | 1986-01-31 | 1987-08-05 | Kyocera Corp | 閃光発光装置の調光回路 |
JPH01172821A (ja) * | 1987-12-28 | 1989-07-07 | Stanley Electric Co Ltd | 自動調光機能を有するフラッシュ発光装置 |
JP2002099031A (ja) * | 2000-09-25 | 2002-04-05 | Fuji Photo Film Co Ltd | ストロボ装置 |
JP2002352993A (ja) * | 2001-05-28 | 2002-12-06 | Fuji Photo Film Co Ltd | ストロボ装置 |
JP2003330077A (ja) * | 2002-05-16 | 2003-11-19 | Nikon Corp | 閃光装置 |
JP2007003898A (ja) * | 2005-06-24 | 2007-01-11 | Stanley Electric Co Ltd | ストロボ装置 |
Also Published As
Publication number | Publication date |
---|---|
JP2011107292A (ja) | 2011-06-02 |
KR20120094478A (ko) | 2012-08-24 |
US20120218465A1 (en) | 2012-08-30 |
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