JP2006322986A - Flash unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flash unit capable of easily and speedily correcting flash light color temperature changes caused by an amount of light emitted by a strobe, the charging voltage of a main capacitor, a light emission mode (flash light emission mode/high speed synchronous light emission mode), the number of times the unit is used (aging), the presence or the absence of a diffusing plate, etc. <P>SOLUTION: Besides a discharge tube as a main light emitting means, the flash unit includes light emitting parts, as auxiliary light emitting means, which emit light using LEDs for three colors, R, G and B. Amounts of light emitted from the corresponding LEDs for the three colors R, G and B are changed and the LEDs emit the light at the same time as the discharge tube. Thereby, flash light color temperature changes caused by the above-described factors are corrected. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a flash light emitting device having a flash light emitting unit and auxiliary light emitting means for assisting light emission of the flash light.

  As a flash device externally connected to a camera, an electroflash using an Xe discharge tube is generally used. Conventionally, a color panel set is known as an accessory of this electroflash. This color panel set is a set of, for example, four color panels of red, blue, green, and yellow and a filter panel for color temperature conversion. By attaching. In color photography, special color effects can be produced, and the color temperature of the flash can be corrected according to the type of film.

Japanese Patent Application Laid-Open No. 10-206942 discloses a flash device that performs such a means for correcting the color temperature of a flash without a color panel. This flash device has a first light emitting means and a second light emitting means, and changes or corrects the color temperature of the first flash light emission by causing the second light emitting means to emit light.
Japanese Patent Laid-Open No. 10-206942

  On the other hand, the flash light emitting means using the Xe discharge tube has the light emission amount at the time of light emission, the charging voltage of the main capacitor, the light emission mode (flash light emission / high speed sync light emission), the number of times of light emission (change over time), the presence or absence of a diffusion plate, bounce It is also known that the angle varies depending on various factors such as the angle.

  In the flash technology, it is mentioned that the color temperature at the time of light emission is changed, but it is not touched on correcting the subtle color temperature change of the flash that changes due to the above factors.

  The present invention has been devised to correct the color temperature change of the flash caused by the above factors, and can easily and quickly correct the color temperature change of the flash that changes due to the above factors.

According to the first aspect of the present invention, the first flash light emitting means for emitting flash light and the one or more first light emitting means for emitting light having different color temperatures as well as different color temperatures of the flash light of the first light emitting means. The second light emitting means and the second light emitting means for controlling the light emission of the second light emitting means in accordance with the light emitting state of the first light emitting means, and correcting the color temperature change that changes according to the light emitting state of the first flashlight. The light emitting means. (Claim 1)
According to the above configuration, the color temperature change that changes depending on the light emission state of the first flash light emitting means can be corrected by the second light emitting means.

According to the present invention, in the flash light emitting device, the light emission state of the first flash light emitting means includes the light emission amount of the first flash light emitting means, the main capacitor charging voltage of the first flash light emitting means, and the light emission time. The light emission mode (flash light emission or flat light emission), the number of light emission times (change over time), the presence / absence of a diffusion plate, the zoom position, and the light emission interval are in one or more states. (Claim 2)
According to the above configuration, the light emission amount of the first flash light emitting means, the main capacitor charging voltage of the first flash light emitting means, the light emission time, the light emission mode (flash light emission or flat light emission), the number of times of light emission (change over time), By changing the color temperature of the second light emitting means according to the presence / absence of the diffusion plate, the zoom position, and the light emission interval, the color temperature change of the first flash device caused by the state change is reduced. I can do it.

Further, the present invention is characterized in that the second light emitting means is composed of RGB three-color LEDs. (Claim 3)
According to the said structure, a 2nd light emission means can be easily light-emitted by predetermined | prescribed color temperature by switching the light emission amount of each of RGB three colors.

Further, the present invention is characterized in that the integrated value of the light emission amount of the first flash light emitting unit and the light emission amount of the second light emitting unit is controlled so as to become a target light emission amount. (Claim 4)
According to the above configuration, even if the second light emitting unit emits light in order to correct the change in the color temperature of the flash of the first flash light emitting unit, the integration of the first flash light emitting unit and the second light emitting unit. The value (total light emission amount) can be made appropriate.

Further, the present invention is characterized in that light emission of the first flash light emission means and light emission of the second light emission means are controlled by an LUT. (Claim 5)
According to the configuration, the first flash light emitting unit and the second light emitting unit are used when correcting the color temperature change of the flash light of the first flash light emitting unit using the light emission of the second light emitting unit. It is possible to calculate the balance of the amount of emitted light without going through complicated arithmetic processing.

  According to the present invention, the first flash light emitting means for emitting the flash light, one or more second auxiliary light emitting means for emitting light having different color temperatures, and the light emission state of the first light emitting means. Second light emitting means for controlling the light emission of the second light emitting means and correcting the color temperature change that changes according to the light emission state of the first flash light, and depending on the light emission state of the main flash light emitting means. The changing color temperature change can be corrected by the auxiliary light emitting means.

  Further, the present invention provides the flash light emitting device, wherein the light emission amount of the first flash light emitting means, the main capacitor charging voltage of the first flash light emitting means, the light emission time, the light emission mode (flash light emission or flat light emission), light emission The color temperature change can be corrected in accordance with a change in one or more of the number of times (change over time), presence / absence of a diffusion plate, zoom position, and light emission interval.

  In the present invention, since the second light emitting means is composed of RGB three-color LEDs, the auxiliary light emitting means can easily emit light at a predetermined color temperature by switching the light emission amounts of the three RGB colors. Can do.

  In the present invention, since the integrated value of the light emission amount of the first flash light emission unit and the light emission amount of the second light emission unit is controlled to be a target light emission amount, the first flash light emission unit is controlled. Even if the second light emitting unit emits light in order to correct the color temperature change of the flash of the light emitting unit, the integrated value (total light emission amount) of the first flash light emitting unit and the second light emitting unit is appropriate. Can be made.

  In the present invention, since the light emission of the first flash light emitting means and the light emission of the second light emitting means are controlled by LUT, the color temperature change of the flash light of the first flash light emitting means is controlled by the second light emission. When the correction is performed using the light emission of the light emitting means, the balance of the light emission amounts of the 21st flash light emitting means and the second light emitting means can be calculated without going through complicated calculation processing.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of a digital camera system and a strobe device according to the invention will be described in detail with reference to the accompanying drawings.

  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. Even when the main mirror 2 is a half mirror and is 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 arranged on the planned imaging plane of the photographing lenses 12 to 14, 4 denotes a pentaprism for changing the finder optical path, and 5 denotes a finder. The photographer observes the focusing plate 3 through this window. You can observe the screen. Reference numerals 6 and 7 denote an imaging lens and a multi-division photometric sensor for measuring the luminance of the subject in the observation screen. The imaging lens 6 is connected to the focusing plate 3 and the multi-division photometric sensor 7 via the reflected light path in the pentaprism 4. It is related to conjugation.

  FIG. 2 shows a photometric area division diagram on the photographing screen. The photographing screen is divided into 21 areas A1 to A21. The multi-segment photometric sensor 7 can measure the brightness of each area related to the imaging screen in a conjugate manner.

  In FIG. 1, 8 is a shutter, and 9 is a photosensitive member, which is made of a silver salt film or the like. Of course, the photosensitive member 9 may be an image sensor such as a CCD instead of the silver salt film.

  Even when the main mirror 2 is installed obliquely, approximately half of the light rays from the subject are transmitted. Reference numeral 21 denotes a sub-mirror that guides the light beam from the subject toward the focus detection unit 22 by bending downward.

  The focus detection unit 22 includes a secondary imaging mirror 23, a secondary imaging lens 24, a focus detection line sensor 25, and the like. The secondary imaging mirror 23 and the secondary imaging lens 24 form a focus detection optical system, and the secondary imaging surface of the photographing optical system is connected to the focus detection line sensor 25. The focus detection unit 22 detects the focus state of the subject in the shooting screen by a known phase difference detection method by processing of an electric circuit described later, and realizes an automatic focus detection device by controlling the focus adjustment mechanism of the shooting lens. ing. This automatic focus detection apparatus detects the focus state of the nine central points of the photometric area in the photographing screen of FIG.

  Reference numeral 19 denotes a photometric lens for photometry of the film surface, and reference numeral 20 denotes a film surface photometric sensor. These are used for so-called TTL dimming, in which the amount of exposure is measured using diffuse reflection of light that reaches the film surface during exposure to obtain an appropriate amount of light for the flash device.

  A mount contact 10 serves as an interface between a known camera and a photographing lens, and a lens barrel 11 is installed on the camera body. Reference numerals 12 to 14 denote photographing lenses, and reference numeral 12 denotes a first group lens. The focusing position on the photographing screen can be adjusted by moving the lens on the optical axis to the left and right. Reference numeral 13 denotes a two-group lens that is movable left and right on the optical axis, thereby changing the shooting screen and changing the focal length of the shooting lens. Reference numeral 14 denotes a three-group fixed lens. Reference numeral 15 denotes a photographing lens aperture.

  Reference numeral 16 denotes a first group lens driving motor, which can automatically adjust the focus position by moving the first group lens to the left or right according to the automatic focus adjustment operation. Reference numeral 17 denotes a lens diaphragm drive motor, which can open or squeeze the photographing lens diaphragm.

  A flash device control unit 18 is attached to the camera body 1 and performs light emission control in accordance with a signal from the camera. Reference numeral 26 denotes a discharge tube which is a first illumination means, which converts current energy into light emission energy. Reference numeral 27 denotes a reflector, and 28 denotes a Fresnel, each of which plays a role of concentrating light emission energy toward a subject efficiently. A known flash device contact 33 is an interface between the camera body 1 and the flash device controller 18.

  A glass fiber 29 guides the light emitted from the discharge tube 26 to the monitor sensor (PD1) 30. The sensor (PD1) 30 measures the amount of pre-light emission and main light emission of the flash device directly, and is a sensor for controlling the main light emission amount, which is the point of the present invention. 31 is a sensor (PD2) for monitoring the light emitted from the discharge tube 26. The light emission current of the discharge tube 26 is limited by the output of the sensor (PD2) 31, and the flash device can perform flat light emission. Reference numeral 32 denotes an RGB LED as a second illumination means, and reference numeral 33 denotes a Fresnel lens for adjusting the irradiation range of the LED 32. FIG. 1 shows only the optical mechanical member among the members necessary for realizing the present invention, and other electric circuit members are necessary, but are omitted here.

  FIG. 3 and FIG. 4 are electric circuit block diagrams of a strobe photographing device according to an embodiment of the present invention. FIG. 3 is a circuit block diagram of the camera body side and the lens side, and FIG. 4 is a circuit block diagram of the flash device side, and members corresponding to those in FIG.

  First, FIG. 3 will be described. Connected to the camera microcomputer 100 are a focus detection circuit 105, a photometry circuit 106, a shutter control circuit 107, a motor control circuit 108, a film running detection circuit 109, a switch sensor circuit 110, a liquid crystal display circuit 111, and a film surface reflection photometry circuit 114. ing. Further, a signal is transmitted to the photographing lens side via the mount contact group 10. Further, the flash device side transmits signals through the flash device contact group 22 in a state where the flash device is directly attached to the camera body.

  As described above, the line sensor 25 is used to detect the focal states of 21 points A1 to A21 in the photographing screen on the finder, and corresponds to each distance measuring point in pairs on the secondary imaging plane of the photographing optical system. Line sensor. The focus detection circuit 105 performs accumulation control and readout control of these line sensors 25 in accordance with signals from 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 performs focus adjustment of the lens by exchanging signals with the lens microcomputer 112 based on the focus detection information.

  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 in both the steady state where the flash device light is not pre-flashed toward the subject and the pre-flash state where the pre-flash is being emitted, and the camera microcomputer 100 outputs the luminance signal to the A / D. Then, calculation of the aperture value and shutter speed for adjusting the exposure of shooting and calculation of the main light emission amount of the flash device at the time of exposure are performed.

  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 the exposure operation.

  The motor control circuit 108 controls the motor in accordance with a signal from the camera microcomputer 100 to perform up / down of the main mirror 2, charge 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. SW2 is turned on by the second stroke of the release button and serves as a switch for starting an exposure operation. SWFELK is a switch that is turned on by a push switch (not shown), and is a start switch for an operation for determining and locking the light amount of the flash device by performing pre-emission of the flash device before the exposure operation. Signals from SW1, SW2, SWFELK and other camera operation members (not shown) are detected by the switch sensor 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 main light emission during exposure to the flash device side.

  The liquid crystal display circuit 111 controls display on the in-viewfinder LCD 41 and the monitor LCD 42 according to a signal from the camera microcomputer 100. Reference numeral 114 denotes a film surface reflection photometry circuit, and the camera microcomputer 100 can obtain photometric information of the film surface photometry sensor 20. The film surface photometric sensor 20 divides the screen as shown in FIG. 2 similarly to the multi-division photometric sensor 7, and can measure the luminance of each area related to the imaging screen in a conjugate manner.

  Next, the configuration of the lens will be described. The camera body and the lens are electrically connected to each other via the lens mount contact 10. The lens mount contact 10 includes a focus drive motor 16 in the lens and a power supply contact L0 of the aperture drive motor 17, a power supply contact L1 of the lens microcomputer 112, and a clock for performing known serial data communication. A contact L2 for data transmission, a contact L3 for data transmission from the camera to the lens, a contact L4 for data transmission from the lens to the camera, a ground contact L5 for the motor power supply, and a ground contact for the power supply for the lens microcomputer 112. L6.

  The lens microcomputer 112 is connected to the camera microcomputer 100 through these lens mount contacts 10 and operates the first lens drive motor 16 and the lens aperture motor 17 to control the focus adjustment and the aperture of the lens. Reference numerals 37 and 38 denote a photodetector and a pulse plate. The lens microcomputer 112 counts the number of pulses so that the position information of the first group lens can be obtained, the focus of the lens is adjusted, and the absolute distance information of the subject is obtained. It can be transmitted to the camera microcomputer 100.

  Next, a circuit block diagram on the flash device side in FIG. 4 will be described.

  The flash device microcomputer 200 is a circuit for controlling the flash device in accordance with a signal from the camera microcomputer 100, and controls the light emission amount, the pre-light emission intensity and the 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 indirectly monitors the voltage of the main capacitor C1 by performing A / D conversion on the divided voltage by the flash device microcomputer built-in A / D converter, and controls the operation of the DC / DC converter 201. By controlling, the voltage of the main capacitor C1 is controlled to a predetermined voltage.

  An existing 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 when the flash device emits light, and applies a high voltage of several thousand volts to the trigger electrode of the discharge tube 26. As a result, discharge of the discharge tube 26 is induced, and the charge energy stored in the main capacitor C1 is released as light energy through the discharge tube 26. Reference numeral 203 denotes an existing 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 at the time of light emission, passes a current through the discharge tube 26, and is turned off when light emission is stopped. The current is cut off and light emission is stopped. A data selector 206 selects an input from X0 to X2 according to selection signals SEL1 and SEL2 from the flash device microcomputer 200, and outputs it to Y.

  Reference numeral 207 denotes a flash light emission control monitor circuit that amplifies the output of the light receiving element 30. An integration circuit 208 integrates the output of 207. A flat light emission control monitor circuit 209 amplifies the output of the light receiving element 31. An EEPROM 210 is a storage means for storing the flat light emission time and the like. Reference numeral 211 denotes an LED indicating whether or not light emission is possible. 32R, 32G, and 32B are RGB LEDs as auxiliary illumination means, the anode is connected to a battery as a power source, and the cathode is connected to existing constant current circuits 34, 35, and 36.

  Reference numeral 213 denotes a non-volatile memory (EEPROM) that holds an LUT table for calculating a ratio of light emission amounts of the R, G, and B LEDs and the discharge tube 26.

  Next, each terminal of the flash device microcomputer 200 will be described.

  CK is an input terminal for a synchronous clock for serial communication with the camera, DI is an input terminal for serial communication data, DO is a data output terminal for serial communication, and CHG is an output that transmits to the camera the flashable state of the flash device as a current. Terminal, X is an input terminal for a light emission timing signal from the camera, ECK is an output terminal for outputting a communication clock for serial communication with writable storage means such as a flash ROM, EDI is serial communication data from the storage means An input terminal, EDO is a serial data output terminal to the storage means, and SELE is an enable terminal for permitting communication with the storage means. For the purpose of explanation, it is enabled at Lo and disabled at Hi.

  POW is an input terminal for inputting the state of the power switch 212, OFF is an output terminal for turning off the flash device when connected to the power switch 212, ON is turning on the flash device when connected to the power switch 212 In the power ON state, the POW terminal is connected to the ON terminal. At that time, the ON terminal is in the high impedance state, the OFF terminal is in 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.

STOP is an input terminal for a light emission stop signal. For the sake of explanation, the light emission stop state is set to Lo. SEL0 and SEL1 are output terminals for instructing input selection of the data selector 206. When the combination of SEL0 and SEL1 is (SEL1, SEL0) = (0, 0), the X0 terminal is connected to the Y terminal. Similarly, the X1 terminal is selected when (0, 1), and the X2 terminal is selected when (1, 0).
DA0 is a D / A output terminal built in the flash device microcomputer 200, and outputs the comparator level of the comparators 204 and 205 as an analog voltage. TRIG is a trigger signal output terminal for instructing the trigger circuit 202 to emit light. CNT is an output terminal for controlling the start / stop of oscillation of the DC / DC converter 201. For the purpose of explanation, charging starts at Hi and charging stops at Lo. INT is a terminal for controlling the start / reset of integration of the integration circuit 208. The integration reset is set at Hi, and the integration is allowed at Lo.

  AD0 and AD1 are A / D input terminals, which convert input voltages into digital data so that they can be processed inside the microcomputer 200. AD0 monitors the voltage of the main capacitor C1, and AD1 The integrated output voltage of the integration circuit 208 is monitored.

  When the LED_P terminal of the flash device microcomputer 200 is Hi, the constant current circuits 34, 35, and 36 are driven with constant current according to the voltage output from the DAR, DAG, and DAB terminals of the built-in DA converter output of the flash device microcomputer 200. , 32G and 32B are turned on.

  Next, each operation | movement of this flash device is demonstrated using FIG.

(Light emission enabled state detection)
When the flash device microcomputer 200 performs A / D conversion on the divided voltage of the main capacitor C1 input to the AD0 port, it is determined that the voltage of the main capacitor C1 is equal to or higher than a predetermined voltage at which light can be emitted. A predetermined voltage and a predetermined current are sucked in from the CHG terminal to inform the camera that light emission is possible. In addition, the LED terminal is set to Hi, the LED 211 is caused to emit light, and light emission possible is displayed. When it is determined that the voltage of the main capacitor C1 is equal to or lower than the predetermined voltage, the CHG terminal is set to non-active, the current is cut off, and the camera cannot transmit light. In addition, the LED terminal is set to Lo, the LED 211 is turned off, and no light emission is displayed.

(Pre-emission by discharge tube (first illumination means))
When the flash device is ready to emit light, the camera body can communicate the emission intensity and emission time of pre-emission and can instruct pre-emission by the discharge tube 26 (first illumination means). A pre-light emission operation by flat light emission in which the discharge tube 26 (first illumination means) continues to emit light at a substantially constant light emission intensity will be described.

  The flash device microcomputer 200 sets a predetermined voltage in DA0 in accordance with a predetermined emission intensity signal instructed from the camera body. Next, Lo and Hi are output to SEL1 and SEL0, and the input X1 is selected. At this time, since the discharge tube 26 has not yet emitted light, the photocurrent of the light receiving element 31 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 to excite the discharge tube 26 and light emission is started.

  On the other hand, the flash device microcomputer 200 instructs the integration circuit 208 to start integration after a predetermined time from the occurrence of the trigger, and the integration circuit 208 starts integration of the output of the monitor circuit 207, that is, the photoelectric output of the light receiving element 30 for light intensity integration. At the same time, a timer for counting a predetermined time is started.

  When pre-light emission is started, the photocurrent of the light emission intensity control light-receiving element 31 for flat light emission increases, the output of the monitor circuit 209 increases, and a predetermined comparator voltage set to the non-inverting input of the comparator 206 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 26 and breaks the discharge loop, but forms a recirculation loop by the diode D1 and the coil L1 to emit light. The current gradually decreases after the overshoot due to the delay in the circuit is settled.

  As the light emission current decreases, the light emission intensity decreases, so the photocurrent of the light receiving element 31 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 again becomes Hi. , The light emission control circuit 203 is turned on again to form a discharge loop of the discharge tube 26, the light emission current increases and the light emission intensity also increases. As described above, the comparator 205 repeatedly increases and decreases the emission intensity in a short period around the predetermined comparator voltage set to DA0, and as a result, the flat emission that continues emission at the desired substantially constant emission intensity. Can be controlled.

  When the above-mentioned light emission time timer is counted and the predetermined pre-light emission time elapses, the flash device microcomputer 200 sets the SEL1 and SEL0 terminals to Lo and Lo, and the input of the data selector 206 is selected to be X0, that is, the Lo level input and output. Is forcibly set to Lo level, and the light emission control circuit 203 interrupts the discharge loop of the discharge tube 26 and ends the light emission.

  At the end of light emission, the flash unit microcomputer 200 reads the output of the integration circuit 208 integrating pre-emission from the A / D input terminal AD1, performs A / D conversion, and calculates the integrated value, that is, the light emission amount during pre-emission as a digital value ( INTp).

(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.

  The flash device microcomputer 200 multiplies the photometric integration value at the time of pre-emission by the value of the relative value (γ) from the camera body to obtain an appropriate integration value.

  Subsequently, the light emission amount ratio between the discharge tube 26 and the LEDs 32R, 32G, and 32B for obtaining an appropriate integral value is calculated from an LUT, which will be described later, stored in the EEPROM 213.

  Based on the calculated emission control amounts of the discharge tube 26 and the LEDs 32R, 32G, and 32B, appropriate integration values are set for the DA0, DAR, DAG, and DAB outputs.

  Next, Hi and Lo are output to SEL1 and SEL0, and the input X2 is selected. At this time, since the integration circuit is in an operation-prohibited state, the output of the integration circuit 208 inputted 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 26 and light emission is started. At this time, the LEDs 32R, 32G, and 32B also start to emit light at the same time.

  In addition, the flash device microcomputer 200 sets the integration start terminal INT to Lo level ten seconds after the trigger noise is reduced and the actual light emission starts, and the integration circuit 208 outputs the output from the sensor 31 to the monitor circuit 207. Integrate via When the integrated output reaches a predetermined voltage set by DAO, the comparator 204 is inverted, the light emission control circuit 203 is cut off through the data selector 206, and light emission stops. On the other hand, the flash device microcomputer 200 monitors the STOP terminal. When 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 emission prohibited state, and the integration start 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 and color temperature.

(LUT)
By simultaneously emitting light from the LEDs 32R, 32G, and 32B when the discharge tube 26 emits light, the emission color temperature of the discharge tube 26 that varies depending on the light emission amount and the main capacitor voltage is corrected. At this time, the emission control amounts of the discharge tube 26 and the LEDs 32R, 32G, and 32B are calculated from the LUT recorded in the EEPROM 213. This LUT calculates the light emission amounts of the discharge tube 26 and the LEDs 32R, 32G, and 32B so that the color temperature when the discharge tube 26 and the LEDs 32R, 32G, and 32B emit light simultaneously is maintained at 5500K. At this time, if the light emission amount of the LEDs 32R, 32G, and 32B is controlled so that only the color temperature is adjusted, the integrated value of the flash light emission amount of the discharge tube 26 and the light emission amount of the LED 32 exceeds an appropriate value. . Therefore, the amount of flash light emitted from the discharge tube 26 and the amount of light emitted from the LED 32 are:
The light emission amount of the discharge tube 26 = the appropriate light emission amount—the control is performed so that the expression of the light emission amount of the three-color LED 32 is satisfied. The LUT in this embodiment is a table of (amount of light emitted from the discharge tube 26, a light amount emitted from the LED 32R, a light amount emitted from the LED 32G, a light amount emitted from the LED 32B) with respect to (target light emission amount, main capacitor voltage). This LUT is prepared in advance by obtaining a combination of a predetermined color temperature (5500 K) and a predetermined light emission amount by emitting light by combining the discharge tube 26 and the LED 32 at the time of designing the flash device.

  In this embodiment, an LUT is shown that corrects the light emission amount of the discharge tube and the color temperature that changes depending on the main capacitor voltage. However, the LUT dimensions are further increased to increase the emission mode (flash emission or flat emission) and the number of emission times. (Change with time), presence / absence of diffusion plate, zoom position, emission interval, etc.

  In this embodiment, the target color temperature is set to 5500K, but the present invention is not limited to this.

  For example, by setting the target color temperature at the center of the color temperature change caused by the main capacitor voltage and the change in the light emission amount of the discharge tube 26, the color temperature corrected by the LED can be reduced. The combination of small amounts of LEDs can reduce the inability to correct the color temperature.

  Next, the operation flow of the strobe photographing apparatus embodying the present invention will be described with reference to FIGS.

  In FIG. 5, when the operation of the camera is started, the camera microcomputer 100 first detects SW1 that is turned on by the first stroke of the release button (step S101). This step is repeated until SW1 is detected.

  When SW1 is detected, the camera microcomputer 100 obtains subject luminance information and color information of a plurality of areas in the screen from the photometric circuit 106 by A / D conversion (step S102). Based on this luminance information, a shutter speed and an aperture value used for an exposure operation described later are obtained by calculation.

  Next, the camera microcomputer 100 drives the focus detection circuit 105 to perform a focus detection operation by a known phase difference detection method (step S103). Since there are multiple points (ranging points) to detect the focus as described above, there are cases where the photographer can arbitrarily set the distance measuring point and the well-known automatic selection algorithm method based on the basic concept of near point priority There are cases.

  The camera microcomputer 100 adjusts the focus of the lens by communicating with the lens side so that the selected distance measuring point is in focus (step S104). Further, the camera microcomputer 100 can obtain the absolute distance information of the lens in-focus position by communication.

  Here, the camera microcomputer 100 determines whether or not SW2 that is turned on by the second stroke of the release button is ON (step S105). If SW2 is OFF, the operations in steps S101 to S104 are repeated, and if SW2 is ON, the process proceeds to the release operation.

  When the release operation is started, first, a flash light amount calculation subroutine is called (step S106).

  Here, the light emission amount calculation subroutine of the flash device will be described with reference to FIG.

The luminance value obtained by the pre-photometry by the photometry circuit 106 is determined for each area.
EVa (i) i = 0-21
Is stored in the RAM (step S201).

Next, the camera microcomputer 100 issues a pre-flash command to the flash device side. In accordance with this command, the flash device microcomputer 200 performs the pre-light emission operation as described above, and obtains the reflected light from the subject by the photometry circuit 106 while the pre-light emission continues. The brightness value is for each area.
EVf (i) i = 0-21
Is stored in the RAM (step S202).

  From the amount of reflected light obtained in steps S201 and S202, a luminance value only for the pre-emission reflected light is extracted.

EVdf (i) ← EVf (i) −EVa (i) i = 0-22
Is stored in the RAM (step S203).

  Next, an appropriate exposure value is calculated using a known method based on the pre-pre-light emission, the luminance information during pre-light emission, distance measurement information, and the like (step S204).

Next, the voltage of the main capacitor C1 is monitored by AD0. (Step S205)
Next, using the LUT recorded in the EEPROM 213, the light emission amounts of the discharge tube 26, the LEDs 32R, 32G, and 32B corresponding to the appropriate light emission amount and the main capacitor C1 voltage are calculated. (Step S206)
Here, the flash device emission amount calculation subroutine is finished, and the camera microcomputer 100 performs an exposure operation by returning to FIG. That is, the main mirror 2 is raised and both the sub mirror 25 are moved away from the photographing optical path, the aperture is controlled by the lens aperture driving motor 17, and the shutter control circuit 107 is controlled so that the determined shutter speed value (TV) is obtained. At this time, the SWX is turned on in synchronization with the shutter fully open, and is transmitted to the flash device side, which becomes a command for the main light emission. The flash device microcomputer 200 performs the above-described main light emission control based on γ sent from the camera, and emits the discharge tube 26 and the LEDs 32R, 32G, and 32B with a predetermined light emission amount.

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

It is a cross-sectional view of the flash photographing apparatus in the embodiment. It is a screen division | segmentation figure of the photometry circuit of the flash imaging device in an Example. FIG. 3 is an electric circuit block diagram of a camera body and a lens of the flash photographing device in the embodiment. It is an electric circuit block diagram of the flash device of the flash photographing device in the embodiment. It is a flowchart of operation | movement of the flash imaging device in an Example. It is a flowchart of the light emission amount calculation of the flash device in an Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Camera body 2 Main mirror 3 Focus plate 4 Penta prism 5 Finder 6 Imaging lens 7 Multi-segment photometric sensor 8 Shutter 9 Photosensitive member 10 Lens mount contact 11 Lens barrel 12 First lens group 13 Second lens group 14 Third lens group fixed lens 15 Shooting lens aperture 16 First lens group drive motor 17 Lens aperture drive motor 18 Flash device control unit 19 Photometric lens 20 Film surface photometric sensor 21 Sub mirror 22 Focus detection unit 23 Secondary imaging mirror 24 Secondary imaging lens 25 Focus detection line sensor 26 Discharge tube 27 Reflector 28 Fresnel 29 Glass fiber 30, 31 Luminescence monitor sensor 32 RGB LED
33 Flash device contact 34, 35, 35 Constant current circuit 37 Photo detector 38 Pulse plate 41 LCD in viewfinder
42 LCD for monitor
100 camera microcomputer 100a EEPROM
100b A / D converter 106 Photometry circuit 107 Shutter control circuit 108 Motor control circuit 109 Film running detection circuit 111 Liquid crystal display circuit 112 Lens microcomputer 114 Film surface reflection photometry circuit 201 DC / DC converter 202 Trigger circuit 203 Light emission control circuit 204, 205 Comparator 206 Data selector 207 Flash light emission control monitor circuit 208 Integration circuit 209 Flat light emission control monitor circuit 210, 213 EEPROM
212 Power switch

Claims (5)

  First flash light emitting means for emitting flash light, one or more second supplementary light emitting means for emitting light having different color temperatures, and the second light emission according to the light emission state of the first light emitting means And a second light emitting means for controlling a color temperature change that changes depending on a light emission state of the first flash light.   The light emission state of the first flash light emission means includes the light emission amount of the first flash light emission means, the main capacitor charging voltage of the first flash light emission means, the light emission time, the light emission mode (flash light emission or flat light emission), and light emission. 2. The flash light emitting device according to claim 1, wherein the number of times (change with time), presence / absence of a diffusion plate, zoom position, and light emission interval are in one or more states.   3. The flash light emitting device according to claim 1, wherein the second light emitting means is an RGB three-color LED.   4. The flash light emitting device according to claim 1, wherein an integrated value of the light emission amount of the first flash light emission unit and the light emission amount of the second light emission unit is controlled to be a target light emission amount. .   5. The flash light emitting device according to claim 1, wherein light emission of the first flash light emitting unit and light emission of the second light emitting unit are controlled by an LUT.

Images