JP4447902B2 - Flash photography system and control method thereof - Google Patents

Description

  The present invention relates to a flash photographing system having a function of performing pre-light emission in advance in order to determine a light emission amount of main light emission, which is light emission at the time of exposure.

In a conventional flash photography system composed of an external or built-in flash device and a camera, pre-light emission for determining the amount of main light emitted by the discharge tube is performed using the same discharge tube as the main light emission. (For example, patent document 1).
JP 2001-326852 A

  In the above conventional example, both the pre-light emission and the main light emission are performed by using a discharge tube for the electrical energy stored in the main capacitor. Therefore, if the interval between the pre-light emission and the main light emission is short, the main capacitor is charged. However, the main light emission is performed in a state in which the charging voltage of the main capacitor is lowered by the amount of energy used in the pre-light emission, and the maximum light emission amount of the main light emission is reduced.

  In addition, when the discharge tube and the subject are too close, the minimum light emission amount of the discharge tube at the time of pre-emission is relatively large, so that there is a problem that the photometric means for measuring pre-emission is saturated.

In order to solve the above-described problems, a flash photographing system according to the present invention includes a main capacitor for storing electric energy, first illumination means for converting electric energy stored in the main capacitor into light, and the main capacitor. Second illumination means for converting electrical energy other than the stored electrical energy into light, and the first illumination means and the second illumination before the main light emission using the first illumination means. A flash photography system that performs pre- flash using any one of the means , wherein the first photometry means that directly measures the amount of light of the first illumination means, the second photometry means that measures the subject brightness, The calculation means for calculating the main light emission amount based on the subject luminance at the time of pre-emission measured by the second photometry means, and the integral value of the light quantity measured by the first photometry means corresponds to the main light emission amount. You And a control means for controlling the main light emission amount of the first illumination means by stopping the light emission when the integrated value is reached, and the control means performed pre-light emission using the first illumination means. In this case, it corresponds to the main light emission based on the integral value of the light quantity measured by the first photometry means when the pre-light emission is performed by the first illumination means and the main light emission amount calculated by the calculation means. When the pre-light emission is performed using the second illumination means, the integral value corresponding to the case where the pre-light emission is performed using the first illumination means and the calculation means are calculated. An integral value corresponding to the main light emission is set based on the main light emission amount .

In order to solve the above-described problem, a control method for a flash photographing system according to the present invention includes a main capacitor that stores electrical energy, and a first illumination unit that converts the electrical energy stored in the main capacitor into light. A second illuminating means for converting electric energy other than the electric energy stored in the main capacitor into light, and before the main light emission using the first illuminating means, the first illuminating means A flash photography system control method for performing pre-flash using any one of the second illumination means, the first photometry step for directly measuring the amount of light of the first illumination means, and the subject brightness photometry A second photometric step, a calculation step for calculating a main light emission amount based on a subject luminance at the time of pre-emission measured in the second photometric step, and a photometry in the first photometric step A control step for controlling the main light emission amount of the first illuminating means by stopping the light emission when the integrated value of the received light amount becomes an integral value corresponding to the main light emission amount, and in the control step, When pre-emission is performed using the first illumination unit, an integral value of the amount of light measured by the first photometry unit when pre-emission is performed by the first illumination unit and the calculation unit calculate When an integral value corresponding to the main light emission is set based on the main light emission amount and the pre-light emission is performed using the second illumination unit, the pre-light emission is performed using the first illumination unit. The integral value corresponding to the main light emission is set on the basis of the integral value corresponding to the case and the main light emission amount calculated by the calculating means .

According to the present invention , it is possible to use the second illumination means that does not use electrical energy stored in the main capacitor for pre-emission, and even if the interval between the pre-emission and the main emission is short, It is possible to prevent the charge voltage from decreasing and the maximum light emission amount of the main light emission from being reduced, and to control the main light emission to an appropriate light emission amount even when the second illumination unit is used for the pre-light emission. I can .

  As shown in Examples 1 to 6 below.

  FIG. 1 is a configuration diagram mainly showing an optical system arrangement of a flash photographing system including a single-lens reflex camera and an external flash device according to Embodiment 1 of the present invention.

  In FIG. 1, reference numeral 1 denotes a camera body in which optical parts, mechanical parts, electric circuits, films, and the like are housed so that photography can be performed. Reference numeral 2 denotes a main mirror, which is obliquely set in or removed from the photographing optical path according to the observation state and the photographing state. Further, the main mirror 2 is a half mirror, and when it is obliquely inclined, approximately half of the light beam from the subject is transmitted through a focus detection optical system described later. Reference numeral 3 denotes a focusing plate disposed on a planned imaging plane of a photographing lens described later, and 4 denotes a pentaprism for changing the finder optical path. Reference numeral 5 denotes a finder, and the photographer can observe the photographing screen by observing the focus plate 3 through this window. Reference numerals 6 and 7 denote an imaging lens and a multi-divided photometric sensor for measuring the luminance of the object in the observation screen. The imaging lens 6 is connected to the focusing screen 3 and the multi-divided photometric sensor 7 via a reflected light path in the pentaprism 4. Is related to conjugation.

  FIG. 4 is a division diagram of areas such as photometry on the photographing screen. The photographing screen is divided into 23 areas A0 to A22, and the multi-segment photometric sensor 7 is related to the photographing screen in a conjugate manner. The brightness of each area can be measured.

  Returning to FIG. 1, 8 is a shutter. Reference numeral 9 denotes a photosensitive member. In this example, a silver salt film is assumed, but an imaging element such as a CCD may be used. Reference numeral 25 denotes a sub-mirror that folds light rays from the subject downward and guides them toward a focus detection unit described later. A focus detection unit 26 includes a secondary imaging mirror 27, a secondary imaging lens 28, a focus detection line sensor 29, and the like. The secondary imaging mirror 27 and the secondary imaging lens 28 form a focus detection optical system, and the secondary imaging surface of the photographing optical system is connected to the focus detection line sensor 29. The focus detection unit 26 detects the focus state of the subject in the shooting screen using a known phase difference detection method. The focus adjustment mechanism of the shooting lens is controlled by the obtained focus detection information, and automatic focus adjustment is performed. Realized. The focus detection unit 26 detects seven focus states A0 to A6 in the shooting screen in FIG. Reference numeral 23 denotes a photometric lens for measuring the film surface of the photosensitive member 9, and reference numeral 24 denotes a film surface photometric sensor, which measures the amount of exposure using diffuse reflection of light reaching the film surface during exposure. It is used for so-called TTL dimming to obtain an appropriate amount of light for the flash device. A mount contact 10 serves as an interface between a known camera body and a photographing lens.

  Reference numeral 11 denotes a lens (lens barrel) constituting the camera together with the camera body 1. Reference numeral 12 denotes a first group lens (focus lens), reference numeral 13 denotes a second group lens (zoom lens), and reference numeral 14 denotes a third group fixed lens. These constitute a photographing lens. The first group lens 12 can be moved to the left and right on the optical axis to adjust the focus position of the shooting screen, and the second group lens 13 can be moved to the left and right on the optical axis to change the shooting screen. The focal length of the lens is changed. Reference numeral 15 denotes a photographing lens aperture. Reference numeral 16 denotes a focus drive motor, which can automatically adjust the focus position by moving the first group lens 12 to the left or right in the drawing in accordance with an automatic focus adjustment operation. Reference numeral 17 denotes an aperture drive motor, which can open or stop the photographic lens aperture 15.

  Reference numeral 18 denotes an external flash device which is attached to the camera body 1 and performs light emission control in accordance with a signal from the camera body 1. Reference numeral 19 denotes a discharge tube as a first illumination means, which converts current energy into light emission energy. Reference numerals 20 and 21 denote a reflector and a Fresnel lens, each of which plays a role of efficiently condensing light emission energy toward a subject. A known flash device contact group 22 serves as an interface between the camera body 1 and the flash device 18. Reference numeral 30 denotes a glass fiber which guides light emitted from the discharge tube 19 to a monitor sensor (photodiode) 31. The sensor 31 directly measures the amount of pre-light emission and main light emission of the flash device 18 and is used for controlling the main light emission amount. Reference numeral 32 denotes a sensor (photodiode) for monitoring the light emitted from the discharge tube 19. The output of the sensor 32 limits the light emission current of the discharge tube 19 so that the flash device 18 can perform flat light emission. Reference numeral 40 denotes a light-emitting diode (hereinafter referred to as an LED) (in this example, a white LED) as a second illumination means, and reference numeral 41 denotes a Fresnel lens for matching the irradiation range of the white LED 40 with the irradiation range of the discharge tube 19. The second illumination means may be a lamp.

  2 and 3 are diagrams showing an electrical configuration of the flash photographing system shown in FIG. 1. Specifically, FIG. 2 is a block diagram showing a circuit configuration on the camera body 1 side and the lens 11 side, and FIG. 3 is a flash diagram. It is a block diagram which shows the circuit structure by the side of the apparatus 18, and the same number is attached | subjected to the member corresponding to FIG.

  First, the circuit configuration of the camera body 1 side and the lens 11 side will be described with reference to FIG. The camera microcomputer 100 manages various operations in the camera using predetermined software. The EEPROM 100b stores film counter and other shooting information. Reference numeral 100c denotes an A / D converter that converts an analog signal from the focus detection circuit 105 including the focus detection line sensor 29 and the photometry circuit 106 including the multi-segment photometry sensor 7 into a digital signal (A / D conversion). The microcomputer 100 sets various states by signal processing the A / D conversion value.

  The camera microcomputer 100 includes a focus detection circuit 105, a photometry circuit 106, a shutter control circuit 107, a motor control circuit 108, a film travel detection circuit 109, a switch sense circuit 110, a liquid crystal display circuit 111, and a film surface photometry sensor 24. A film surface reflection photometry circuit 114 is connected. Further, signals are transmitted to the lens 11 side via the mount contact group 10. Further, when the flash device 18 is directly attached to the camera body 1, signals are transmitted to the flash device 18 side via the flash device contact group 22.

The focus detection line sensor 29 is for detecting the focus states of seven points A0 to A6 in the shooting screen, and is paired with each focus detection point (ranging point) on the secondary imaging plane of the shooting optical system. It is the line sensor arranged correspondingly. The focus detection circuit 105 performs accumulation control and readout control of the line sensor 29 according to the signal of the camera microcomputer 100, and outputs pixel information obtained by photoelectric conversion to the camera microcomputer 100, respectively. The camera microcomputer 100 A / D converts this information and performs focus detection by a known phase difference detection method. The camera microcomputer 100, the focus detection information, performs focus adjustment of the first group lens 12 by exchanging the lens microcomputer 112 and signal.

  The photometry circuit 106 outputs to the camera microcomputer 100 the output from the multi-division photometry sensor 7 that divides the screen into a plurality of areas as described above as the luminance signal of each area in the screen. The photometry circuit 106 outputs a luminance signal to the camera microcomputer 100 in both a steady state where the flash device 18 does not pre-emit and a pre-emission state where pre-emission is directed toward the subject. The camera microcomputer 100 performs A / D conversion on the luminance signal, calculates the aperture value and shutter speed for shooting exposure adjustment, and calculates the main light emission amount of the flash device 18 during exposure. The shutter control circuit 107 runs the shutter front curtain (MG-1) and the shutter rear curtain (MG-2) in accordance with a signal from the camera microcomputer 100, and performs an exposure operation. The motor control circuit 108 controls the motor M in accordance with a signal from the camera microcomputer 100, thereby performing up / down of the main mirror 2, charging of the shutter, and feeding of the film. The film running detection circuit 109 detects whether or not the film has been wound up by one frame when the film is fed, and sends a signal to the camera microcomputer 100.

  SW1 is turned on by a first stroke of a release button (not shown), and serves as a switch for starting photometry and AF (autofocus). SW2 is a switch that is turned on by the second stroke of the release button and starts an exposure operation. SWFELK is a switch that is turned on by a push switch (not shown), and is a start switch for the operation of performing pre-light emission of the flash device 18 before the exposure operation to determine and lock the main light emission amount. Signals from the switches SW 1, SW 2, SWFELK and other camera operation members (not shown) are detected by the switch sense circuit 110 and sent to the camera microcomputer 100. SWX is a switch that is turned on when the shutter is fully opened, and sends the light emission timing of the main light emission during exposure to the flash device 18 side.

  The liquid crystal display circuit 111 controls display on the in-viewfinder LCD 42 and the monitor LCD 43 in accordance with a signal from the camera microcomputer 100. Reference numeral 114 denotes a film surface reflection photometry circuit including the film surface photometry sensor 24 shown in FIG. 1, and outputs photometric information of the film surface photometry sensor 24 to the camera microcomputer 100. The film surface photometric sensor 24 divides the screen as shown in FIG. 4 like the multi-division photometric sensor 7 and can measure the luminance of each area related to the shooting screen in a conjugate manner. .

  Next, the circuit configuration on the lens 11 side will be described. The camera body 1 and the lens 11 are electrically connected to each other via the lens mount contact 10 as described above. The lens mount contact 10 is a power contact L0 for the focus drive motor 16 and the aperture drive motor 17 in the lens 11, a power contact L1 for the lens microcomputer 112, and a clock for performing known serial data communication. Contact L2, a data transmission contact L3 from the camera body 1 to the lens 11, a data transmission contact L4 from the lens 11 to the camera body 1, a motor ground contact L5 to the motor power supply, and the lens microcomputer 112 power supply It is comprised by L6 which is a ground contact with respect to. The lens microcomputer 112 is connected to the camera microcomputer 100 via the lens mount contact 10 and operates the focus drive motor 16 and the aperture drive motor 17 to adjust the focus of the first group lens 12 as the focus lens shown in FIG. The photographic lens aperture 15 is controlled.

  Reference numerals 35 and 36 denote a photodetector and a pulse plate. The lens microcomputer 112 can obtain position information of the first lens group 12 as a focus lens by counting the number of pulses, and adjust the focus of the lens. The absolute distance information of the subject can be transmitted to the camera microcomputer 100.

  Next, the circuit configuration on the flash device 18 side will be described with reference to FIG. Reference numeral 200 denotes a flash device microcomputer that controls the flash device 18 in accordance with a signal from the camera microcomputer 100. The flash device microcomputer 200 controls a light emission amount, a pre-light emission intensity, a light emission time, and the like. A DC / DC converter 201 boosts the battery voltage to several hundred volts in accordance with an instruction from the flash device microcomputer 200 and charges the main capacitor C1. R1 and R2 are voltage dividing resistors provided for the flash device microcomputer 200 to monitor the voltage of the main capacitor C1. The flash device microcomputer 200 controls the operation of the DC / DC converter 201 by indirectly monitoring the voltage of the main capacitor C1 by A / D converting the divided voltage with a built-in A / D converter. Thus, the voltage of the main capacitor C1 is controlled to a predetermined voltage.

  A trigger circuit 202 outputs a trigger signal via the flash device microcomputer 200 in response to an instruction from the camera microcomputer 100 or a SWX signal at the time of light emission, and applies a high voltage of several thousand volts to the trigger electrode of the discharge tube 19. A discharge of the discharge tube 19 is induced, and the charge energy stored in the main capacitor C1 is released as light energy through the discharge tube 19. Reference numeral 203 denotes a light emission control circuit using a switching element such as an IGBT. The light emission control circuit 203 is turned on when a trigger voltage is applied during light emission, passes a current through the discharge tube 19, and is turned off when light emission is stopped. The current to the tube 19 is interrupted to stop light emission. Reference numerals 204 and 205 denote comparators. The comparator 204 is used to stop light emission during flash emission described later, and the comparator 205 is used for light emission intensity control during flat light emission described later. A data selector 206 selects inputs D0 to D2 and outputs them to the Y terminal in accordance with selection signals from the SEL0 and SEL1 terminals of the flash device microcomputer 200.

  Reference numeral 207 denotes a flash light emission control monitor circuit that amplifies the output of the sensor 31. An integration circuit 208 integrates the output of the flash light emission control monitor circuit 207. A flat light emission control monitor circuit 209 amplifies the output of the sensor 32. Reference numeral 210 denotes a storage unit such as an EEPROM for storing the flat light emission time and the like. Reference numeral 216 denotes an LED indicating that light emission is possible. Reference numeral 40 denotes a white LED as a second illumination means, an anode is connected to a battery as a power source, and a cathode is connected to an existing constant current circuit 44.

  Next, each terminal of the flash device microcomputer 200 will be described. The CK terminal is an input terminal for a synchronous clock for serial communication with the camera body 1, the DI terminal is an input terminal for serial communication data, the DO is a data output terminal for serial communication, and the CHG terminal is a flashable state of the flash device 18. An output terminal for transmitting the current to the camera body 1 as an electric current, an X terminal is an input terminal for a light emission timing signal from the camera body 1, and an ECK terminal is a writable storage unit such as an EEPROM or a flash ROM connected to the outside of the flash device microcomputer 200 An output terminal for outputting a communication clock for serial communication with 210, an EDI terminal is a serial data input terminal from the storage unit 210, and an EDO terminal is a serial data output terminal to the storage unit 210. SELE is an enable terminal that permits communication with the storage unit 210. For the sake of explanation, SELE is enabled when Lo (means low level) and disabled when Hi (means high level). In the present embodiment, the storage unit 210 is set outside the flash device microcomputer 200, but it goes without saying that the same is true even if the storage unit 210 is built in the flash device microcomputer.

  The POW terminal is an input terminal for inputting the state of the power switch 215, and the OFF terminal is an output terminal for turning off the flash device 18 when connected to the power switch 215. The ON terminal is an output terminal for turning on the flash device when connected to the power switch 215. In the power ON state, the POW terminal is connected to the ON terminal. At that time, the ON terminal is in a high impedance state and the OFF terminal. Is the Lo state, and vice versa in the power off state. The LED is a display output terminal that displays that light can be emitted.

  The STOP terminal is an input terminal for a light emission stop signal. For the sake of explanation, the light emission stop state is set to Lo. The SEL0 and SEL1 terminals are output terminals for instructing the input selection of the data selector 206. When the combination of SEL0 and SEL1 is (SEL1, SEL0) = (0, 0), the D0 terminal is connected to the Y terminal. Similarly, the D1 terminal is selected when (0, 1) and the D2 terminal is selected when (1,0). The DA0 terminal is a D / A output terminal built in the flash device microcomputer 200, and outputs the comparison level of the comparators 204 and 205 as an analog voltage. The TRIG terminal is a trigger signal output terminal that instructs the trigger circuit 202 to emit light. The CNT terminal is an output terminal that controls the start / stop of oscillation of the DC / DC converter 201. For the sake of explanation, charging starts with Hi and charging stops with Lo. The INT terminal is a terminal for controlling the start / reset of integration of the integration circuit 208, and Hi is used for integration reset and Lo is used for integration. The AD0 and AD1 terminals are A / D input terminals, and convert input voltages into digital data so that they can be processed in the flash device microcomputer 200. The AD0 terminal monitors the voltage of the main capacitor C1, and the AD1 terminal monitors the integrated output voltage of the integrating circuit 208.

  When the LED_P terminal of the flash device microcomputer 200 is Hi, the constant current circuit 44 turns on the white LED 40 with constant current driving according to the voltage output from the DA1 terminal of the DA converter output built in the flash device microcomputer 200.

  Next, each operation in the flash device 18 will be described with reference to FIG.

<Detection of light emission enabled state>
The flash device microcomputer 200 performs A / D conversion on the divided voltage of the main capacitor C1 input to the AD0 terminal to determine whether the voltage of the main capacitor C1 is equal to or higher than a predetermined voltage at which light can be emitted. If so, a predetermined current is sucked from the CHG terminal and the camera body 1 is informed that light can be emitted. Further, the LED terminal is set to Hi, and the LED 216 is caused to emit light to indicate that light emission is possible. When it is determined that the voltage of the main capacitor C1 is less than the predetermined voltage, the CHG terminal is set to non-active to cut off the current and inform the camera body 1 that light emission is impossible. In addition, the LED terminal is set to Lo, the LED 216 is turned off, and a light emission disabled state is displayed.

<Pre-emission by discharge tube (first illumination means)>
When the flash device 18 is ready to emit light, the camera body 1 can communicate the emission intensity and emission time of pre-emission and can instruct pre-emission by the discharge tube 19 (first illumination means). Here, a pre-light emission operation by flat light emission in which the discharge tube 19 continues to emit light at a substantially constant light emission intensity will be described. The flash device microcomputer 200 sets a predetermined voltage at the DA0 terminal in accordance with a predetermined emission intensity signal instructed from the camera body 1. Next, Lo and Hi are output to the SEL1 and SEL0 terminals, and the D1 terminal is selected. At this time, since the discharge tube 19 has not yet emitted light, the photocurrent of the sensor 32 hardly flows, the output of the monitor circuit 209 input to the inverting input terminal of the comparator 205 is not generated, and the output of the comparator 205 is Hi. Therefore, the light emission control circuit 203 is turned on. Next, when a trigger signal is output from the TRIG terminal, the trigger circuit 202 generates a high voltage and excites the discharge tube 19 to start light emission.

The flash device microcomputer 200 instructs the integration circuit 208 to start integration after a predetermined time from the generation of the trigger signal, and the integration circuit 208 integrates the output of the monitor circuit 207, that is, the photoelectric output of the sensor 31 for integrating the light amount. Simultaneously with the start, a timer for counting a predetermined time is started.

  When pre-emission is started, the photocurrent of the sensor 32 for controlling emission intensity of flat emission increases, the output of the monitor circuit 209 increases, and a predetermined comparison voltage set as the non-inverting input of the comparator 205 is reached. When it becomes higher, the output of the comparator 205 is inverted to Lo, and the light emission control circuit 203 cuts off the light emission current of the discharge tube 19 and breaks the discharge loop. However, the diode D1 and the coil L1 form a circulation loop, and the light emission current After the overshoot due to the delay of the circuit is settled, it gradually decreases. As the light emission current decreases, the light emission intensity decreases, so the photocurrent of the sensor 32 decreases, the output of the monitor circuit 209 decreases, and when the output falls below a predetermined comparison level, the output of the comparator 205 is inverted again to Hi. Then, the light emission control circuit 203 is turned on again, a discharge loop of the discharge tube 19 is formed, the light emission current increases, and the light emission intensity also increases. As described above, the comparator 205 repeats the increase and decrease of the emission intensity in a short period around the predetermined comparison voltage set at the DA0 terminal, and as a result, the flatness continues the emission at the desired substantially constant emission intensity. Light emission can be controlled.

  When the above-mentioned light emission time timer is counted and a predetermined pre-light emission time elapses, the flash device microcomputer 200 sets the SEL1 and SEL0 terminals to Lo and Lo. As a result, D0, that is, Lo level input is selected as the input of the data selector 206, the output is forced to Lo level, and the light emission control circuit 203 interrupts the discharge loop of the discharge tube 19 and ends light emission. At the end of light emission, the flash device microcomputer 200 reads the output of the integrating circuit 208 integrating the pre-emission from the A / D input terminal AD1, performs A / D conversion, and converts the integrated value, that is, the emission amount at the time of pre-emission to a digital value ( INTp).

<Pre-emission with white LED (second illumination means)>
Next, the pre-light emission operation by the white LED 40 (second illumination means) will be described. When the pre-emission intensity and duration are communicated from the camera body 1 and pre-emission by the white LED 40 is instructed, the flash device microcomputer 200 sets the LED_P terminal to Hi output, and a voltage corresponding to the instructed amount of light. Is output from the DA1 terminal and the constant current circuit 44 is driven to light the white LED 40. Simultaneously with the start of lighting, the operation of the lighting time control timer is started, and the white LED 40 is turned on for the designated time.

<Correspondence between pre-emission by discharge tube and pre-emission by white LED>
Next, correspondence between pre-emission by the discharge tube 19 and pre-emission amount by the white LED 40 will be described. Using the discharge tube 19, the maximum value of the pre-emission intensity and the amount of light emitted at unit time are measured with an existing external light meter, this value is Lp1 (max), and the integrated output of the integrating circuit 208 is INTp ( max) and stored in the storage unit 210 such as an EEPROM in the flash device 18. Further, the white LED 40 is used to measure the maximum value of the pre-emission intensity and the amount of light emitted in unit time with an existing external light meter, and this value is set to Lp2 (max), and the storage unit in the flash device 18 210 is stored. The maximum value of the pre-emission emission intensity to be instructed is the same value when pre-emission is performed with the discharge tube 19 and when pre-emission is performed with the white LED 40.

<Main flash control>
The camera microcomputer 100 obtains an appropriate relative value (γ) for the pre-emission of the main emission amount from the brightness value of the reflected light from the subject from the multi-division photometry sensor 7 at the time of pre-emission, and sends it to the flash device microcomputer 200. When the pre-emission is performed by the discharge tube 19, the flash device microcomputer 200 multiplies the photometric integration value (INTp) at the time of pre-emission by the value of the relative value (γ) from the camera body 1 to obtain an integral value ( INTm) is determined, and an appropriate integral value (INTm) is set to the DA0 terminal. When pre-emission is performed by the white LED 40, an integral value INTp2 corresponding to pre-emission in the discharge tube 19 is calculated from Lp1 (max), INTp (max), and Lp2 (max) stored in the storage unit 210. To do. That is, assuming that the communication value of the emission intensity of the pre-emission from the camera body 1 is 8 counts 1 stage and Lp1 (max) and Lp2 (max) are linear light quantities, INTp2 = INTp (max)
÷ 2 ^ {(maximum pre-emission intensity-emission intensity of pre-emission) / 8}
× {Lp2 (max) / Lp1 (max)}
It is obtained by the operation of Then, the appropriate integral value (INTm) is obtained by multiplying the value corresponding to the photometric integration value (INTp2) at the time of pre-emission obtained in this way by the value of the appropriate relative value (γ) from the camera body 1, and the DA0 terminal is obtained. Set the appropriate integral value (INTm).

  Next, Hi and Lo are output to the SEL1 and SEL0 terminals, and the D2 terminal is selected. At this time, since the integration circuit 208 is in an operation-prohibited state, the output of the integration circuit 208 input to the inverting input terminal of the comparator 204 is not generated, and the output of the comparator 204 is Hi, so that the light emission control circuit 203 becomes conductive. . Next, when a trigger signal is output from the TRIG terminal, the trigger circuit 202 generates a high voltage to excite the discharge tube 19, so that light emission is started. In addition, the flash device microcomputer 200 sets the INT terminal for starting integration to the Lo level 10 seconds after the start of the actual light emission while the trigger noise due to the trigger application is settled. Thereby, the integration circuit 208 integrates the output from the sensor 31 via the monitor circuit 207. When the integrated output reaches a predetermined voltage set at the DA0 terminal, the output of the comparator 204 is inverted, the light emission control circuit 203 is cut off through the data selector 206, and light emission stops. The flash device microcomputer 200 monitors the STOP terminal. When the output of the STOP terminal is inverted and the light emission is stopped, the SEL1 and SEL0 terminals are set to Lo and Lo to set the forced light emission prohibition state and the integration is started. The output of the INT terminal is inverted, the integration is terminated, and the light emission process is terminated. In this way, the main light emission can be controlled to an appropriate light emission amount.

Next, with reference to FIG. 5 to FIG. 6, the operation of the flash microcomputer system configured as described above in the camera microcomputer 100 will be mainly described.
[Step # 100] The camera microcomputer 100 starts operation.
[Step # 101] The state of the switch SW1 that is turned on by the first stroke of the release button is detected. This operation is repeated until the ON state of the switch SW1 is detected. When the switch SW1 is turned ON, the process proceeds to the next step # 102.
[Step # 102] The A / D conversion values of the subject luminance information of a plurality of areas in the screen are obtained from the photometry circuit 106. From this luminance information, the shutter speed and aperture value used for the exposure operation described later are obtained by calculation.
[Step # 103] By driving the focus detection circuit 105, a focus detection operation by a known phase difference detection method is performed. Since there are multiple points for focus detection (ranging) as described above, there are cases where the photographer can arbitrarily set the focus detection point, and in the case of the well-known automatic selection algorithm method based on near point priority The focus state is detected at this point.
[Step # 104] The camera microcomputer 100 adjusts the focus of the lens by communicating with the lens 11 so that the selected focus detection point is in focus. At this time, the camera microcomputer 100 can obtain the absolute distance information (DAF) of the lens in-focus position by communication.
[Step # 105] It is determined whether or not the switch SW2 that is turned on by the second stroke of the release button is turned on. If it is OFF, the operations from step # 101 to # 104 are repeated, and if the switch SW2 is ON, the process proceeds to a release operation after step # 106.
[Step # 106] When the release operation is started, a flash device emission amount calculation subroutine is first called.

Here, the flash device emission amount calculation subroutine will be described with reference to the flowchart of FIG.
[Step # 200] The camera microcomputer 100 starts a flash device emission amount calculation subroutine.
[Step # 201] The subject luminance is obtained by the photometry circuit 106 immediately before the pre-flash. The brightness value is for each area.
EVa (i) i = 0-18
Is stored in the built-in RAM.
[Step # 202] The absolute distance information (DAF) obtained in Step # 104 of FIG. 5 is compared with a predetermined value. If the DAF is farther than the predetermined value, the process proceeds to Step # 220. Proceed to 203.
[Step # 203] Since the DAF is closer than the predetermined value, the flash device 18 is communicated with the white LED 40, which is the second illumination means, via the communication terminal 22 so as to perform pre-emission.
[Step # 220] Since the DAF is farther than the predetermined value, the discharge tube 19 as the first illuminating means is selected via the communication terminal 22 to the flash device 18, and communication is performed so that pre-emission is performed.

After instructing pre-emission with the discharge tube 19 or the white LED 40 as described above, the process proceeds to step # 204.
[Step # 204] The camera microcomputer 100 instructs the flash device 18 to perform pre-flash. The flash device microcomputer 200 performs the pre-light emission operation as described above in accordance with this command. Further, the camera microcomputer 100 obtains the subject brightness by the photometric circuit 106 while the pre-flash is maintained. The brightness value is for each area.
EVf (i) i = 0-18
Is stored in the RAM.
[Step # 205] A luminance value only for the pre-light-emission reflected light is extracted from the EVa and EVf.

EVdf (i) <-EVf (i) -EVa (i) i = 0-18
Is stored in the RAM.
[Step # 206] In order to properly control the amount of light of the flash device 18, a central area for calculation is selected.

There are a method of selecting the area as described above using the focus detection point as it is, a method of selecting an area where the EVdf value indicating the area of the subject closest to the camera is maximized, and the like. When an area is selected, another area used for weighting calculation described later is selected as shown in FIG. The other areas are adjacent to the central area where the calculation is performed, but are not limited to this area, and may be all remaining areas. In addition, two or more areas may be selected as the central area where the calculation is performed.
[Step # 207] The camera microcomputer 100 calculates and determines the weighting coefficients a and b from the information regarding the distance of the subject. As the information regarding the distance of the subject, the EVdf value of the area selected in step # 206 is used. Since EVdf is a luminance value only for the pre-light-emission reflected light, naturally, when the distance is doubled, EVdf is ¼ of the data related to the distance.

FIG. 8 shows a method for determining the weighting coefficients a and b. The coefficient a is a weighting coefficient for the central area where the calculation is performed, and the coefficient b is a weighting coefficient for the other areas. The coefficient a is decreased and the coefficient b is increased as the object distance is closer and the EVdf value is increased. Conversely, when the distance is increased and the EVdf value is decreased, the coefficient a is increased and the coefficient b is increased. Is made smaller. However, since the determination of the coefficients a and b is based on a standard photographing operation, a and b are used for special photographing such as photographing with a bounce flash device, multi-flash device, wireless flash device, and macro photography. It is quite possible that the value of will change. The distance data may simply use the absolute distance information obtained by the camera microcomputer 100 communicating with the lens 11 in step # 104.
[Step # 208] The camera microcomputer 100 calculates an appropriate flash device light amount for each of the selected areas to be weighted averaged.

P = {TGT-EVa (i)} / EVdf (i)
TGT: Proper exposure
EVa: luminance of subject due to external light
EVdf: luminance of pre-emission reflected light only
P: Appropriate amount of flash in each area Then, P (P1) of the selected central area and P (P2) of other areas are obtained by a simple average from the value of P in each area. (If there is only one central area selected, the average is the value itself.)
Furthermore, the following equation Wave = a × P1 + b × P2 (both a and b are ≦ 1)
To perform the weighted average.
[Step # 209] The camera microcomputer 100 performs a calculation (calculation of the main light emission amount) for converting the value of the weighted average wave into an appropriate relative value (γ), and sends the value of γ to the flash device 18 side by communication.

Thus, the flash device emission amount calculation subroutine (the process of step # 106 in FIG. 5) is completed, and the process proceeds to step # 107 in FIG.
[Step # 107] The camera microcomputer 100 performs an exposure operation. That is, the main mirror 2 is raised, and both the sub mirror 25 and the sub mirror 25 are moved away from the photographic optical path, the photographic lens diaphragm 15 on the lens 11 side is controlled to control the diaphragm, and the shutter control is performed so that the determined shutter speed value (Tv) is obtained. The circuit 107 is controlled. At this time, the switch SWX is turned ON in synchronism with the full opening of the shutter, and this ON is transmitted to the flash device 18 side, which is a command for starting the main light emission. Then, the flash device microcomputer 200 performs the main light emission control as described above to an appropriate amount based on the γ sent from the camera body 1.

  Finally, the main mirror 2 and the like moved away from the photographing optical path are lowered and obliquely installed again on the photographing optical path, and the film is wound up by one frame by the motor control circuit 108 and the film running detection circuit 109.

According to the first embodiment described above, when the distance to the subject is longer than the predetermined value, the pre-light emission is performed using the discharge tube 19 as the first illumination means (steps # 202 → # 220 in FIG. 6). If the distance to the subject is closer than the predetermined value, that is, if the subject can be irradiated with the pre-light emission even by using the second illumination means having a light quantity smaller than that of the discharge tube 19 as the first illumination means, Pre-light emission is performed using the white LED 40 as the second illumination means (steps # 202 → # 203 in FIG. 6). Therefore, when the distance to the subject is closer than a predetermined value, the electric energy (charging energy) of the main capacitor C1 is not consumed, and the voltage drop of the main capacitor during main light emission can be prevented. Further, it is possible to prevent saturation of the photometric means (comprising the photometric circuit 106 including the multi-segment photometric sensor 7) that measures pre-emission at a close distance.

  Next, a flash photographing system according to Embodiment 2 of the present invention will be described. Since the configuration of the camera body, lens, and flash device is the same as that of the first embodiment, description thereof is omitted.

  Hereinafter, only parts different from the operation of the first embodiment will be described. In the first embodiment, the selection of whether to perform pre-light emission using the discharge tube 19 as the first illumination means or the white LED 40 as the second illumination means is performed by the camera microcomputer. In the second embodiment of the present invention, it is performed on the flash device microcomputer 200 side. The flash device microcomputer 200 selects the first illumination means and the second illumination means in accordance with the charging voltage of the main capacitor C1.

  A flash device emission amount calculation subroutine on the camera body 1 side in Embodiment 2 of the present invention will be described with reference to FIG. Steps # 300 to # 301 in FIG. 9 are the same operations as steps # 200 to # 201 in FIG. 6 in the first embodiment. For steps # 302 to # 308, the same operations as steps # 204 to # 210 in FIG.

  In the first embodiment, the camera microcomputer 100 performs pre-emission based on the absolute distance information (DAF) obtained in step # 104 of FIG. 5 and the discharge tube 19 (first illumination means) and the white LED 40 (second illumination means). However, in the second embodiment, in step # 302, a pre-flash command is issued to the flash device 18 side, and the subject brightness is measured during the pre-flash duration. 106.

  In step # 302, the flash device microcomputer 200 having received the pre-flash start command from the camera microcomputer 100 performs pre-flash interrupt processing. The pre-flash interrupt process executed by the flash device microcomputer 200 will be described below with reference to FIG.

  The operation starts from step # 400 in FIG. 10, and the flash device microcomputer 200 first calculates an A / D conversion value of a voltage obtained by dividing the charging voltages R1 and R2 of the main capacitor C1 at the AD0 terminal in step # 401. If the main capacitor C1 exceeds the predetermined voltage, the process proceeds to step # 410, and if it is equal to or lower than the predetermined voltage, the process proceeds to step # 402. When the process proceeds to step # 402, a pre-light emission operation by the white LED 40 (second illumination means) is performed. On the other hand, when it progresses to step # 410, the pre light emission operation | movement by a discharge tube (1st illumination means) is performed. In step # 403, the interrupt process is terminated.

  Since the correspondence between the pre-light emission by the discharge tube 19 and the pre-light emission by the white LED 40, the main light emission control, and the main light emission operation are the same as those in the first embodiment, details thereof are omitted.

  According to the second embodiment described above, when the charging voltage of the main capacitor C1 in the flash device 18 is equal to or lower than the predetermined voltage, the white LED 40 is used for pre-light emission. Electric energy is not consumed, and even if the interval between the pre-light emission and the main light emission is short, the charging energy of the main capacitor C1 is not insufficient for the main light emission due to the pre-light emission. . That is, it is possible to prevent a voltage drop of the main capacitor during main light emission.

Next, a flash photographing system according to Embodiment 3 of the present invention will be described. The configuration of the camera body, lens, and flash device is the same as that of the first embodiment, and the operation of the camera body 1 and lens 11 is also the same as that of the first embodiment. Differs from the first embodiment, a part of the operation in the flash device 18, according to the spectral characteristic difference of the white LED40 are words and the discharge tube 19 is a first illuminating means second illumination means, the film exposure This is a point having a correction value for correcting the difference.

<Correction of film exposure amount by spectral characteristic difference between discharge tube (first illumination means) and white LED (second illumination means)>
The spectral characteristics of the discharge tube 19 which is the first illumination means are as shown in FIG. On the other hand, the spectral characteristics of the white LED 40 which is the second illumination means are as shown in FIG.

  In the first embodiment, the pre-light emission by the discharge tube 19 as the first illumination means and the pre-light emission by the white LED 40 as the second illumination means are associated with each other. If the spectral sensitivity of the split photometric sensor 7 is the same, the amount of light received on the sensor can be adjusted to be the same, but the spectral sensitivity of the film 9 (image sensor in a digital camera), which is a photosensitive member, and the spectral sensitivity of the sensor 7. Sensitivity does not match. FIG. 12A shows the spectral sensitivity of the image sensor (sensor), and FIG. 12B shows the spectral sensitivity of the blue-sensitive layer, green-sensitive layer, and red-sensitive layer of the film. In order to correct the difference in exposure amount, the first illumination is obtained from the difference in exposure amount of the film 9 which is a photosensitive member when exposed by the light emission of the first and second illumination means having the same light amount on the sensor. The correction value α when pre-light emission is performed by the second illumination unit based on the unit is calculated and stored in the storage unit 210 such as an EEPROM.

<Pre-flash control>
The pre-light emission operation by the discharge tube 19 (first illumination means) and the pre-light emission operation by the white LED 40 (second illumination hand) are the same as in the first embodiment.

<Main flash control>
Next, the main light emission control will be described. Similar to the first embodiment, the camera microcomputer 100 obtains an appropriate relative value (γ) for the pre-emission of the main emission amount from the subject reflected light luminance value from the multi-segment photometry sensor 7 at the time of pre-emission, and the flash device microcomputer. Send to 200. When the pre-emission is performed by the discharge tube 19, the flash device microcomputer 200 multiplies the photometric integration value (INTp) at the time of pre-emission by the value of the relative value (γ) from the camera body 1 to obtain an integral value ( INTm) is determined, and an appropriate integral value (INTm) is set to the DA0 terminal.

When pre-emission is performed by the white LED 40, an integral value INTp2 equivalent to pre-emission in the discharge tube 19 is calculated from Lp1 (max), INTp (max), and Lp2 (max) stored in the storage unit 210. . Specifically, assuming that the communication value of the emission intensity of pre-emission from the camera body 1 is 8 counts 1 stage, and Lp1 (max) and Lp2 (max) are linear light quantities, INTp2 = INTp (max)
÷ 2 ^ {(maximum pre-emission intensity-emission intensity of pre-emission) / 8}
× {Lp2 (max) / Lp1 (max)}
Pre-light emission was performed by the second illumination means based on the first relative illumination value and the appropriate relative value (γ) from the camera body 1, corresponding to the photometric integration value (INTp2) during pre-emission obtained by the above calculation. The appropriate integration value (INTmc) is obtained by multiplying the correction value α in this case, and the appropriate integration value (INTmc) is set to the DA0 terminal. Subsequent operations are the same as those in the first embodiment.

  According to the third embodiment described above, it is possible to correct the difference in exposure amount according to the spectral characteristics of the discharge tube 19 and the white LED 40 and the spectral sensitivity of the film 9 (or the image sensor). Other effects are the same as those of the first embodiment.

  In the third embodiment, the flash device microcomputer 200 calculates the appropriate relative value (γ) and the correction value α. However, the correction value α is transmitted by communication to the camera body, and the camera microcomputer 100 The corrected relative value (γ ′) obtained by multiplying the appropriate relative value (γ) by the correction value α may be transmitted to the flash device. In addition, the correction value α may be a value corresponding to each film, for each digital camera, for each image sensor type, for each flash device type, for each flash device emission amount, and for each flash device main capacitor charging voltage. Absent.

  Next, a flash photographing system according to Embodiment 4 of the present invention will be described. Since the configuration of the camera body, lens, and flash device is the same as that of the first embodiment, description thereof is omitted.

  Hereinafter, only parts different from the operation of the first embodiment will be described. In the first embodiment, the selection of whether to perform pre-light emission using the discharge tube 19 as the first illumination means or the white LED 40 as the second illumination means is performed by the camera microcomputer. In the fourth embodiment of the present invention, it is performed on the flash device microcomputer 200 side. The flash device microcomputer 200 performs the selection depending on whether the flash device is set to the power saving mode.

  The flash device light emission amount calculation subroutine on the camera body 1 side in Embodiment 4 of the present invention will be described again with reference to FIG. Steps # 300 to # 301 in FIG. 9 are the same operations as steps # 200 to # 201 in FIG. 6 in the first embodiment. In steps # 302 to # 308, the same operations as those in steps # 204 to # 210 in FIG.

  In the first embodiment, the camera microcomputer 100 performs pre-emission based on the absolute distance information (DAF) obtained in step # 104 of FIG. 5 and the discharge tube 19 (first illumination means) and the white LED 40 (second illumination means). However, in the fourth embodiment, in step # 302, the preflash command is issued to the flash device 18 side, and the subject brightness is measured during the preflash duration. 106.

  In step # 302, the flash device microcomputer 200 having received the pre-flash start command from the camera microcomputer 100 performs pre-flash interrupt processing. The pre-flash interrupt process executed by the flash device microcomputer 200 will be described below with reference to FIG.

  The operation starts from step # 500 in FIG. 13, and the flash device microcomputer 200 first determines in step # 501 whether the power saving mode (LOW POWER SW) is set. If not, that is, LOW. If the POWER SW input is OFF, it is determined that the power saving mode is not set, and the process proceeds to step # 510. If the power saving mode is set (ON), the process proceeds to step # 502. In step # 502, since the power saving mode is set, the pre-light emission operation by the white LED 40 (second illumination unit) is performed. On the other hand, when the process proceeds to step # 210, since the power saving mode is not set, the pre-light emission operation by the discharge tube 19 (first illumination means) is performed. In step # 503, the interrupt process is terminated.

  Since the correspondence between the pre-light emission by the discharge tube 19 and the pre-light emission by the white LED 40 and the main light emission control are the same as those in the first embodiment, the details thereof are omitted.

  According to the fourth embodiment described above, when the flash device 18 is set in the power saving mode, the white LED 40 as the second illumination means is pre-light-emitting (steps # 501 → # in FIG. 13). 502), the electric energy of the main capacitor C1 is not consumed during the pre-light emission, and the charging energy of the main capacitor C1 is consumed by the pre-light emission during the main light emission even if the interval between the pre-light emission and the main light emission is short. There will be no shortage of minutes. That is, it is possible to prevent a voltage drop of the main capacitor during main light emission.

  Next, a flash photographing system according to Embodiment 5 of the present invention will be described. Since the configuration of the camera body, lens, and flash device is the same as that of the first embodiment, description thereof is omitted.

  The operation of the camera microcomputer 100 that is different from the first embodiment will be described below with reference to the flowchart of FIG. 14, operations other than step # 606 are the same as the operations of steps # 100 to # 108 of FIG. 5 in the first embodiment.

  In step # 606 of FIG. 14, the camera microcomputer 100 communicates the operation start time and operation time of the red-eye mitigation function to the flash device microcomputer 200. The flash device microcomputer 200 communicated with the operation of the red-eye mitigation function outputs a predetermined voltage from the DA1 terminal for the time indicated by the communication. Thereby, white LED40 which is a 2nd illumination means lights, and red-eye reduction is performed.

  According to the fifth embodiment described above, the white LED 40 as the second illumination unit can be used as the illumination unit for reducing red eyes.

  Next, a flash photographing system according to Embodiment 6 of the present invention will be described. Since the configuration of the camera body, lens, and flash device is the same as that of the first embodiment, description thereof is omitted. The operation of the flash device 18 and the operation of the lens 11 are the same as those in the first embodiment, and the flash device emission amount calculation subroutine in the camera microcomputer 100 having a difference will be described with reference to FIG.

  The operations in steps # 700 to # 701 in FIG. 15 are the same as steps # 200 to # 201 in FIG. Also, the operations in steps # 704 to # 710 are the same as the operations in steps # 204 to # 210 in FIG.

  In FIG. 15, in step # 702, the camera microcomputer 100 determines whether or not the subject luminance information is larger than a predetermined value, and if larger, the process proceeds to step # 720, and if smaller than the predetermined value, proceeds to step # 703. In step # 703, the flash device 18 is communicated with the white LED 40, which is the second illumination means, via the communication terminal 22 so as to perform pre-emission. On the other hand, if it progresses to step # 720, it will communicate with the flash device 18 via the communication terminal 22 so that the discharge tube 19 as the first illumination means is selected and pre-light emission is performed.

  According to the sixth embodiment described above, when the subject brightness (external light brightness) is equal to or lower than a predetermined value, that is, the white LED 40 as the second illumination unit having a pre-emission amount lower than the discharge tube 19 as the first illumination unit. Even if the pre-flash is used, if the photometric means of the camera can measure the subject brightness by the pre-flash irradiation (steps # 702 → # 703 in FIG. 15), the white LED 40 is used to perform the pre-flash. Therefore, it is possible to prevent a voltage drop of the main capacitor during main light emission.

  According to each of the above embodiments, in the flash photographing system for performing pre-light emission for determining the light emission amount of the main light emitted by the discharge tube 19, in addition to the discharge tube 19 as the first illumination means, it is used at the time of pre-light emission. The second illumination means (in the embodiment, white LED 40) is provided, and at the time of pre-emission, one of the first illumination means and the second illumination means is selected as follows: Thus, the pre-light emission is performed.

  1) Information related to the distance to the subject is detected, and when this information is closer than a predetermined value, the white LED 40 as the second illumination means is selected for pre-emission, and when the distance is longer than the predetermined value The discharge tube 19 as the first illumination means is selected for pre-emission. 2) The charging voltage of the main capacitor C1 is detected, and when the charging voltage is lower than a predetermined value, the white LED 40 as the second illumination means is selected for pre-emission, and when the charging voltage is higher than the predetermined value, the pre-emission is performed. The discharge tube 19 as the first illumination means is selected. 3) When the energy saving mode is set, the white LED 40 as the second illumination unit is selected for the pre-light emission. 4) The subject brightness (external light brightness) is measured, and when the photometric result is lower than a predetermined value, the white LED 40 as the second illumination means is selected for pre-emission, and when it is higher than the predetermined value, The discharge tube 19 as the first illumination means is selected for light emission.

  Therefore, the pre-light emission can be performed by the white LED 40 which is the second illumination means that does not use the electric energy stored in the main capacitor C1, and even when the interval between the pre-light emission and the main light emission is short, the pre-light emission causes the main light emission. Since the charging voltage of the capacitor C1 does not decrease, the maximum light emission amount of main light emission does not decrease.

  Further, as in 1) above, when the subject is too close to the discharge tube 19 and close-up shooting, the second illumination means can emit light with a light emission amount smaller than the minimum light emission amount of the discharge tube 19 during pre-flash. Since the white LED 40 can be used, the photometric means for measuring pre-emission is not saturated.

  Furthermore, when there is a means for correcting the difference due to the spectral characteristics of the discharge tube 19 that is the first illumination means and the spectral characteristics of the white LED 40 that is the second illumination means, Since the light emission amount of the main light emission by the obtained discharge tube 19 is corrected, even if the illumination means is different between the pre-light emission and the main light emission, flash photography with appropriate exposure can be performed.

  Furthermore, since the white LED 40 as the second illuminating means is used as an illuminating means for functioning red-eye reduction, the white LED 40 can be effective in terms of cost and space.

  In each of the above embodiments, the flash device constituting the flash photographing system is assumed to be an external device, but may be a built-in flash device.

1 is a configuration diagram showing an optical system arrangement of a flash photographing system according to Embodiment 1 of the present invention. FIG. FIG. 2 is a block diagram illustrating an electrical configuration on the camera body side of FIG. 1. It is a block diagram which shows the electrical structure by the side of the flash device of FIG. FIG. 3 is an area division diagram for photometry and the like on the photographing screen according to the first embodiment of the present invention. It is a flowchart which shows the operation | movement with the camera microcomputer concerning Example 1 of this invention. It is a flowchart which shows the operation | movement of the flash device light emission amount calculation in the camera microcomputer concerning Example 1 of this invention. It is a figure which shows the area selection example which performs the weighted average concerning Example 1 of this invention. It is a figure which shows the method of the determination of the weighting coefficient concerning Example 2 of this invention. It is a flowchart which shows the operation | movement of the flash device light emission amount calculation in the camera microcomputer concerning Example 2 of this invention. It is a flowchart which shows the operation | movement with the flash device microcomputer at the time of the pre light emission operation | movement concerning Example 2 of this invention. It is a figure which shows the spectral characteristic of the discharge tube which is the 1st illumination means concerning the Example of this invention, and the spectral characteristic of white LED which is the 2nd illumination means. It is a figure which shows the spectral sensitivity of the sensor concerning the Example of this invention, and the spectral sensitivity of a photosensitive member (film). It is a flowchart which shows the operation | movement with the flash device microcomputer at the time of the pre light emission concerning Example 4 of this invention. It is a flowchart which shows the operation | movement with the camera microcomputer concerning Example 5 of this invention. It is a figure which shows the flowchart which shows the operation | movement of the flash device light emission amount calculation in the camera microcomputer concerning Example 6 of this invention.

Explanation of symbols

1 Camera body 7 Multi-segment photometric sensor 11 Lens 18 Flash device 19 Discharge tube 29 Focus detection unit 40 White LED
DESCRIPTION OF SYMBOLS 100 Camera microcomputer 105 Focus detection circuit 106 Photometry circuit 111 Liquid crystal display circuit 114 Film surface reflection photometry circuit

Claims (2)

A main capacitor for storing electrical energy; a first illumination means for converting electrical energy stored in the main capacitor into light; and a second capacitor for converting electrical energy other than electrical energy stored in the main capacitor into light. The flash photographing system includes a lighting unit, and performs pre-light emission using either the first lighting unit or the second lighting unit before the main light emission using the first lighting unit. And
First photometric means for directly measuring the light quantity of the first illumination means;
A second metering means for metering subject brightness;
Calculating means for calculating a main light emission amount based on subject brightness at the time of pre-lighting measured by the second photometry means;
Control means for controlling the main light emission amount of the first illumination means by stopping light emission when the integral value of the light quantity measured by the first photometry means becomes an integral value corresponding to the main light emission amount; Have
When the pre-emission is performed using the first illumination unit, the control unit includes an integral value of the light amount measured by the first photometry unit when the pre-emission is performed by the first illumination unit. When an integral value corresponding to the main light emission is set based on the main light emission amount calculated by the calculation means, and the pre-light emission is performed using the second illumination means, the first illumination means is used. The flash photographing system is characterized in that an integral value corresponding to the main light emission is set based on an integral value corresponding to the case where the pre-light emission is performed and the main light emission amount calculated by the calculating means . A main capacitor for storing electrical energy; a first illumination means for converting electrical energy stored in the main capacitor into light; and a second capacitor for converting electrical energy other than electrical energy stored in the main capacitor into light. A flash photographing system having a lighting unit and performing pre-light emission using either the first lighting unit or the second lighting unit before the main light emission using the first lighting unit. A method,
A first photometric step for directly measuring the amount of light of the first illumination means;
A second metering step for metering subject brightness;
A calculation step of calculating a main light emission amount based on the subject luminance at the time of pre-light emission measured in the second photometry step;
A control step for controlling the main light emission amount of the first illuminating means by stopping the light emission when the integral value of the light quantity measured in the first photometry step becomes an integral value corresponding to the main light emission amount. Have
In the control step, when pre-emission is performed using the first illumination unit, an integrated value of the light amount measured by the first photometry unit when pre-emission is performed by the first illumination unit; When an integral value corresponding to the main light emission is set based on the main light emission amount calculated by the calculation means, and the pre-light emission is performed using the second illumination means, the first illumination means is used. A control method for a flash photographing system, wherein an integral value corresponding to the main light emission is set based on an integral value corresponding to a case where pre-light emission is performed and a main light emission amount calculated by the calculating means .

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