JPH1039368A - Stroboscope control camera system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a camera system capable of always obtaining a proper emitted light quantity by making the result of a calculation for correcting a normal emitted light quantity different in accordance with the fact that a normal or special system state is obtained. SOLUTION: Preliminary light emission is executed prior to normal light emission by a strobe microcomputer 200, a main capacitor C1, a Xenon tube 19, a light emission control circuit 203, etc., and the photometry of light reflected from an object in the preliminary light emission is executed by a multidivision photometry sensor. A camera microcomputer makes the calculation for correcting the light quantity of the normal light emission, with the result of the photometry. Then, the microcomputer 200, switches SWT, SWMZ, etc., discriminate whether photographing is normal one or special one from the conditions of a stroboscope, a lens, etc., to make the calculation for correcting the normal emitted light quantity different in accordance with the result of the discrimination. Thus, an easy-to-use strobe control camera system capable of executing control with the emitted strobe light quantity capable of always obtaining a proper exposure, even in any photographing can be provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improved strobe control camera system which emits light toward a subject and controls an amount of light emission so as to obtain an appropriate exposure automatically and performs an exposure operation.

[0002]

2. Description of the Related Art Conventionally, various flash control camera systems have been proposed in which a strobe light is emitted toward a subject and an exposure operation is performed by adjusting a light emission amount so as to automatically obtain a proper exposure. For example, such as TTL dimming, which obtains an appropriate amount of light emission by measuring the reflected light on the film surface of light that reaches the film surface at the time of exposure, or performs preliminary light emission toward a subject. A device that obtains an appropriate amount of light emission by measuring the reflected light of a subject such as a strobe light, such as a device that controls with a relative light amount, has high accuracy and is generally used.

In order to obtain these proper light emission amounts, control is generally performed on the assumption that the reflectivity of the subject is a 18% gray reflector, so that both white and black objects become gray. Will be controlled. Further, when a specular reflection material such as glass is present on the screen, the reflected light of the subject of the strobe becomes extremely large, and the amount of the strobe light is controlled to be much lower than the proper exposure amount.

[0004]

SUMMARY OF THE INVENTION Therefore, Japanese Patent Laid-Open No.
In 31935, the strobe light is pre-flashed before exposure,
At that time, the subject reflected light is measured by a multi-segment photometric sensor, the multi-segment cut area is determined from the pre-emission light amount and the subject distance information, and the emission amount correction value of the main emission is determined and controlled. Proposed.

[0005] Further, by using the focal length information and the photographing distance information of the lens, even if the subject has an extremely high or low reflectivity as compared with a standard reflector, the strobe light amount is below the proper level. Proposals have been made by the present applicant to make corrections so as not to be excessive or excessive.

However, in this method, the camera body
Since a camera system such as a lens and a strobe performs calculations and corrections assuming a normal state, an appropriate amount of strobe light may not be obtained under special system conditions.

For example, when a strobe is irradiated simultaneously or continuously with multiple lamps, a multi-flash strobe that repeats a small light emission a plurality of times during exposure, a manual zoom strobe that allows a photographer to arbitrarily set a light emission angle, and the like. When the strobe is not a simple system, or when the lens is not a simple system, such as when attaching an intermediate ring to the lens, attaching a close-up lens, or attaching an ND filter or other special filter. .

FIG. 14 shows a part of an example of the special system.

FIG. 14A shows an example of a multi-flash strobe system, in which a first strobe connected to an upper part of a camera,
A second strobe controlled by wireless communication using infrared light or the like is simultaneously emitted to shoot. In such photographing, better photographing can be performed, such as erasing shadows produced by one flash emission.

FIG. 14B shows an example of macro photographing using an intermediate ring. By attaching an intermediate ring between the camera body and the photographing lens, the distance becomes shorter than the shortest photographing distance inherent to the photographing lens. Since the object can be focused on, the photographed object can be described even larger. At this time, the strobe is irradiating obliquely with a wireless strobe.

Under such a special system, there is a drawback that an appropriate amount of strobe light cannot be obtained due to correction.

(Object of the Invention) It is an object of the present invention to provide a strobe control camera system capable of always achieving a proper light emission amount even in a special system state other than a normal system.

[0013]

In order to achieve the above object, according to the present invention, there is provided a preliminary light emission control means for performing preliminary light emission prior to main light emission, and an object reflection of the preliminary light emission. A strobe control camera system for correcting and controlling the amount of main light emission based on the preliminary light emission reflected light metering means for measuring light, and the metering result of the preliminary light emission reflected light metering means, wherein the state of the camera system is automatically or manually A state discriminating means for discriminating based on an input accompanying an operation is provided. The state discriminating means determines whether the camera system is in a normal system state or in a special system state (specifically, a multi-flash strobe system state, a manual zoom strobe state, , The result of the correction calculation of the main light emission amount differs depending on whether the lens is in a special state when the intermediate ring is attached or when the close-up lens is attached, or the like. Unishi to have.

According to another aspect of the present invention, there is provided a pre-emission control unit for performing pre-emission prior to main emission, comprising:
Preliminary reflected light multi-segment metering means for dividing the screen into a plurality of areas for photometry, and controlling the amount of main emission light in a plurality of areas based on the photometric results of the pre-emitted reflected light multi-segment metering means. Area selection means for selecting an area; main light emission amount control means for controlling the main light emission amount based on the result of the area selection means; state determination means for determining the state of the camera system; and Area selection control means for differentiating the area selection by the area selection means, and the state determination means determines whether the camera system is in a normal system state or in a special system state (specifically, a multi-flash strobe system state). , Manual zoom strobe state, the special state of the lens when the intermediate ring is attached or when the close-up lens is attached, etc.) So that they occupy different areas selected for the quantity control.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on illustrated embodiments.

FIG. 1 is a configuration diagram mainly illustrating an optical configuration of a flash control camera system according to a first embodiment of the present invention applied to a single-lens reflex camera.

In FIG. 1, reference numeral 1 denotes a camera main body, in which optical parts, mechanical parts, electric circuits, films, and the like are housed so that a photograph can be taken. Reference numeral 2 denotes a main mirror which is inclined to the photographing optical path or retreats according to the observation state and the photographing state. The main mirror 2 is a half mirror, and transmits about half of the light beam from the subject to a focus detection optical system described later even when the main mirror 2 is inclined. Reference numeral 3 denotes a focusing plate arranged on a predetermined imaging plane of the photographing lenses 12 to 14, 4 denotes a pentaprism for changing a finder optical path, 5 denotes a finder, and a photographer observes the focusing plate 3 from this window. You can observe the shooting screen. Reference numerals 6 and 7 denote an imaging lens and a multi-segment photometry sensor for measuring the luminance of the subject in the observation screen.
The imaging lens 6 conjugately connects the focus plate 3 and the multi-segment photometric sensor 7 via a reflection optical path in the penta roof prism 4.

Here, the function of the multi-segment photometric sensor 7 will be described in detail with reference to FIG. FIG. 2 is a diagram showing a divided state of the photometric area on the photographing screen.
Numeral 40 represents the entire photographing screen. Reference numeral 41 denotes an area division for photometry on the photographing screen of the multi-segment photometric sensor 7, which divides the photographing screen into six areas such as E0, E1, E2, E3, E4, and E5. The multi-segment photometric sensor 7 associated with the photographic screen in this manner can divide the photographic screen, measure the respective brightness values, and output it.

Returning to FIG. 1, reference numeral 8 denotes a shutter, 9 denotes a photosensitive member such as a silver halide film, and 25 denotes a sub-mirror. The sub-mirror 25 folds a light beam from a subject downward and guides it toward a focus detection unit 26 described below. ing.

The focus detection unit 26 includes a secondary imaging mirror 27, a secondary imaging lens 28, a focus detection line sensor 29, etc. The secondary imaging mirror 27, the secondary imaging lens 28 forms a focus detection optical system,
The secondary imaging surface of the photographing optical system is connected to the focus detection line sensor 29. Further, the focus detection unit 26 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 controls the focus adjustment mechanism of the shooting lens to thereby control the automatic focus detection device. Has been realized.

This automatic focus detection device detects the focus state of three predetermined points on the screen. FIG. 2 shows the positions of the three points, and P0, P1, and P2 of the focus detection points (hereinafter, referred to as ranging points) are the positions.

Reference numeral 23 denotes a photometric lens for photometry of a film surface, and reference numeral 24 denotes a film surface photometry sensor, which measures the amount of exposure using diffuse reflection of light that has reached the film surface during exposure, and uses a strobe light. The so-called T to obtain an appropriate amount of light
Used for TL dimming.

Reference numeral 10 denotes a mounting contact serving as an interface between a known camera and a photographing lens, and reference numeral 11 denotes a lens mounted on the camera body 1. Reference numerals 12 to 14 denote photographing lenses. More specifically, reference numeral 12 denotes a first-group lens, which can adjust the focus position of the photographing screen by moving left and right on the optical axis. 13 is a two-group lens,
By moving on the optical axis left and right, it becomes a magnification of the shooting screen,
The focal length of the taking lens is changed. Reference numeral 14 denotes a third-group fixed lens.

Reference numeral 15 denotes a taking lens aperture. Reference numeral 16 denotes a first group lens drive motor,
The focus position can be automatically adjusted by moving the group lens 12 left or right. Reference numeral 17 denotes a lens aperture driving motor, which
Can be opened or squeezed.

Reference numeral 43 denotes an accessory device detection switch which detects that various accessories such as an ND filter and a close-up lens are attached to the tip of the taking lens, and which is a simple mechanical switch or an optical switch using a photo reflector. It is constituted by a target detection means.

Reference numeral 18 denotes an external strobe (device) which is attached to the camera body 1 and controls light emission according to a signal from the camera body 1. A xenon tube 19 converts current energy into luminous energy. Reference numerals 20 and 21 denote a reflection plate and a Fresnel lens, respectively, which have a role of efficiently condensing light emission energy toward a subject. Reference numeral 22 denotes a known strobe contact which serves as an interface between the camera body 1 and the external strobe 18.

Numeral 30 is a glass fiber, which receives light emitted from the xenon tube 19 as a light receiving sensor for monitoring (PD1).
It leads to 31. The light receiving sensor (PD1) 31 directly measures the preliminary light emission of the strobe and the light amount of the main body light, and is a sensor for controlling the main light emission amount, which is a point of the present invention. Numeral 32 denotes a light receiving sensor (PD2) for monitoring the light emitted from the xenon tube 19. The light emitting current of the xenon tube 19 is limited by the output of the light receiving sensor (PD2) 32 so that the strobe emits flat light. Can be done.

Reference numeral 33 denotes a switch for detecting whether the flash is used for bounce photography. Reference numeral 34 denotes an irradiation angle (strobe zoom) adjustment mechanism that moves the reflection plate 20 back and forth, and adjusts the irradiation angle of strobe light emission to match the focal length of the photographing lens and the screen.

Reference numerals 218 and 219 denote means for transmitting signals to other strobes and the camera main body 1 by infrared light in the space. Specifically, 218 is a reception sensor, and 219 is a transmission infrared LED.

FIG. 1 shows only optical members among members necessary for realizing the present invention, and other electric circuit members are required, but are omitted here.

3 and 4 are electric circuit block diagrams of the strobe control camera system shown in FIG. 1. FIG. 3 shows circuit blocks on the camera body side and lens side, and FIG. 4 shows circuit blocks on the strobe side. , And members corresponding to those in FIG. 1 are denoted by the same reference numerals.

First, the circuit configuration of the camera body 1 and the lens 11 shown in FIG. 3 will be described.

Referring to FIG. 1, reference numeral 100 denotes a camera microcomputer which performs an internal operation based on a clock generated by an oscillator 101. The camera microcomputer 100 internally stores a film counter and other photographing information, and a focus detection circuit 10 described later.
5, an A / D converter 100c for A / D converting an analog signal from the photometry circuit 106, etc., and the camera microcomputer 100 performs signal processing on an A / D value in the A / D converter 100c. Thus, various states are set.

The camera microcomputer 100 includes a focus detection circuit 105, a photometry circuit 106, a shutter control circuit 10
7, motor control circuit 108, film running detection circuit 10
9, switch sense circuit 110, and liquid crystal display circuit 1
11 are connected. Signals are transmitted to the lens 11 via the mount contact group 10. Signals are transmitted to the external strobe 18 through the strobe contact group 22 when the strobe 18 is directly attached to the camera body 1. When a strobe is provided at a spatially separated position, the transmission / reception circuit 113 is provided.
Accordingly, the camera body 1 can communicate with the strobe 18.

Reference numerals 113, 50, and 51 denote means for transmitting signals to the strobe 18 by infrared light in the space. More specifically, 113 is a transmitting / receiving circuit, 50 is a receiving sensor,
Reference numeral 51 denotes a transmission infrared LED.

The line sensor 29 includes three sets of line sensors L corresponding to the three distance measuring points on the finder as described above.
It is a known CCD line sensor composed of ine-L, Line-C, and Line-R.

The focus detection circuit 105 performs accumulation control and read control of these line sensors 29 in accordance with signals from the camera microcomputer 100, and outputs respective pixel information to the camera microcomputer 100. Then, the camera microcomputer 100 performs A / D conversion of this information and performs focus detection by a well-known phase difference detection method. In addition, the camera microcomputer 100
Performs focus adjustment of the lens by exchanging signals with the lens microcomputer 112 based on focus detection information.

The photometric circuit 106 outputs to the camera microcomputer 100, as a luminance signal of each area in the screen, the output from the multi-segment photometric sensor 7 obtained by dividing the screen into six areas as described above. Specifically, the photometric circuit 10
6 outputs a luminance signal in both a steady state in which the flash light is not preliminarily emitted toward the subject and a preliminary light emission state in which the preliminary light emission is performed, and the camera microcomputer 100 converts the input luminance signal into an A / D signal. After the conversion, calculation of the aperture value and adjustment of the shutter speed for adjusting the exposure for photographing, and calculation of the main flash light emission amount at the time of exposure are performed.

The shutter control circuit 107 controls the shutter first curtain (MG-
1) The rear curtain of the shutter (MG-2) is run to perform the exposure operation. The motor control circuit 108 controls the motor in accordance with a signal from the camera microcomputer 100 to perform the up / down movement of the main mirror 2, the charging of the shutter, and the feeding of the film. The film running detection circuit 109 detects whether the film has been wound up by one frame at the time of feeding the film, and sends a signal to the camera microcomputer 100.

SW1 is a switch for turning on the first stroke of a release button (not shown) to start photometry and AF. SW2 is turned on by the second stroke of the release button
And a switch for starting an exposure operation. SWF
ELK is a switch that is turned ON by a push switch (not shown), and is a start switch for an operation of performing a preliminary flash emission before an exposure operation to determine and lock a flash light amount.

The switches SW1, SW2, SWFEL
The states of K and other signals from an operation member of the camera (not shown) are detected by the switch sense circuit 110, and the states are sent to the camera microcomputer 100. SWX is a switch that is turned on when the shutter is fully opened, and sends the emission timing of the main emission at the time of exposure to the strobe 18 side.

The liquid crystal display circuit 111 controls the display of the LCD 41 in the finder and the LCD 42 for monitoring (not shown) in accordance with a signal from the camera microcomputer 100.

Reference numeral 114 denotes a film surface reflection photometry circuit,
The camera microcomputer 100 can obtain photometric information of the film surface photometric sensor 24. The film surface photometry sensor 24 divides the screen in the same manner as the multi-segment photometry sensor 7 and outputs an image. Each area corresponds to the area of the multi-segment photometry sensor 7.

Next, the configuration of the lens 11 will be described.

The camera body 1 and the lens 11 are electrically connected to each other via the lens mount contacts 10 as described above.

This lens mount contact 10 is
1, L0, which is a power supply contact of the focus driving motor 16 and the aperture driving motor 17, and the lens microcomputer 112
L1, a power contact, a clock contact for performing known serial data communication L2, a data transmission contact from the camera body 1 to the lens 11, L3,
L4, which is a data transmission contact from the camera body 1 to the camera body 1
L5, which is a ground contact for the motor with respect to the power supply for the motor, and L6, which is a ground contact for the power supply for the lens microcomputer 112.

The lens microcomputer 112 is connected to the camera microcomputer 100 via these lens mount contacts 10 and operates the first lens drive motor 16 and the lens aperture motor 17 to control the focus of the lens 11 and control the aperture. ing.

Reference numerals 35 and 36 denote a photodetector and a pulse plate.
When the lens microcomputer 112 counts the number of pulses, the position information of the first lens group 12 shown in FIG. 1 can be obtained, the focus of the lens group is adjusted, and the absolute distance information of the subject is transmitted to the camera microcomputer 100. I can do it.

Reference numeral 43 denotes an accessory attachment detection switch for detecting that various accessories such as an ND filter and a close-up lens are attached to the tip of the lens 11 as described with reference to FIG.
Transmits the information detected here to the camera microcomputer 100.

Next, the structure of the strobe 18 will be described with reference to FIG.

Reference numeral 200 denotes a flash microcomputer, which controls flash light emission in accordance with a signal from the camera microcomputer 100, that is, controls the amount of light emission, the emission intensity and emission time of flat emission, the emission angle, and the like.

Reference numeral 201 denotes a DC / DC converter, which boosts the battery voltage to several hundred volts according to an instruction from the flash microcomputer 200 and charges the main capacitor C1. R1, R2
Sets the voltage of the main capacitor C1 to the strobe microcomputer 20.
0 is a voltage dividing resistor provided for monitoring. The strobe microcomputer 200 indirectly monitors the voltage of the main capacitor C1 by A / D converting the divided voltage by an A / D converter built in the strobe microcomputer, and operates the DC / DC converter 201. To control the voltage of the main capacitor C1 to a predetermined voltage.

Reference numeral 202 denotes a trigger circuit, which outputs a trigger signal via the flash microcomputer 200 in response to an instruction from the camera microcomputer 100 or an SWX signal at the time of flash emission, and applies a high voltage of several thousand volts to the trigger electrode of the xenon tube 19. As a result, discharge of the xenon tube 19 is induced, and the charge energy stored in the main capacitor C1 is transferred to the xenon tube 1.
9 as light energy.

Reference numeral 203 denotes a light emission control circuit using a switching element such as an IGBT (insulated gate bipolar transistor). The light emission control circuit 203 is turned on when a trigger voltage is applied at the time of light emission, the current of the xenon tube 19 flows, and when light emission is stopped. By shutting off the current, the current of the xenon tube 19 is interrupted to stop the light emission.

Reference numerals 204 and 205 denote comparators. The comparator 204 is used for stopping light emission during flash light emission described later, and the comparator 205 is used for controlling light emission intensity during flat light emission described later. Reference numeral 206 denotes a data selector, which is a selection signal SEL1 from the flash microcomputer 200.
In accordance with SEL2, the input of the D2 terminal is selected from the D0 terminal and output to the Y terminal.

Reference numeral 207 denotes a flash emission control monitor circuit, which logarithmically compresses and amplifies the output of the light receiving sensor (PD1) 31. Reference numeral 208 denotes the flash emission control monitor circuit 207.
Is an integration circuit that integrates the output of. Reference numeral 209 denotes a flat light emission control monitor circuit, and a light receiving sensor (PD2) 32
Amplify the output. An EEPROM 210 is a storage unit for storing the flat light emission time and the like.

Numeral 34 denotes an irradiation angle (strobe zoom) adjusting mechanism, which is a well-known motor drive circuit 211, a zoom drive motor 212, a pinion gear 213, a rack gear 214, and a zoom position detection encoder 2 for detecting the positions of the reflection shade 20.
15 or the like.

An LED 216 indicates that light emission is possible. 2
Reference numerals 17 to 219 denote means for transmitting a signal in the space by infrared light.
Reference numeral 18 denotes a reception sensor, and 219 denotes a transmission infrared LED.

SWB is a switch for determining whether or not the flash is in a bounce state. SWT is a switch interlocked with a multi-light setting button (not shown). The photographer operates the multi-light setting button at the time of so-called multi-light strobe shooting by performing photographing using a plurality of strobes. Sets the multiple-light strobe.

SWMZ is a switch linked to a manual zoom setting button (not shown). The switch SWMZ is used when a lens that cannot automatically detect focal length information is used, or when the photographer intentionally uses a strobe irradiation angle different from the shooting angle of view. When shooting with a special effect such as irradiating a strobe with a strobe to the subject, the strobe microcomputer 200 operates the irradiation angle adjusting mechanism 34 by operating the manual zoom setting button, The user sets the irradiation angle desired by the photographer.

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

CK is an input terminal of a synchronous clock for performing serial communication with the camera body 1, DI is an input terminal of serial communication data, DO is a data output terminal of serial communication, and CHG is a current in which a strobe can emit light. X is an output terminal for transmitting to the camera body 1, X is an input terminal of a light emission timing signal from the camera body 1, and ECK is EEPRO which is storage means connected to the outside of the flash microcomputer 200.
M or an output terminal for outputting a communication clock for performing serial communication with writable storage means such as a flash ROM, EDI is a serial data input terminal from the storage means, and EDO is serial data to the storage means. Output terminal.

SELE is an enable terminal for permitting communication with the storage means. For the sake of explanation, Lo (meaning low level) is enabled and Hi (meaning high level) is disabled. In this embodiment, a storage means (EEPROM 21) is provided outside the flash microcomputer 200.
0) is set, but it goes without saying that the same is true even if the flash microcomputer 200 is built in.

POW is an input terminal for inputting the state of the power switch 215, OFF is an output terminal for turning off the strobe when connected to the power switch 215, O
N is an output terminal for turning on the strobe when connected to the power switch 215. In the power ON state, the POW terminal is connected to the ON terminal, in which case the ON terminal is in the high impedance state, and the OFF terminal is Lo. In the power-off state. The LED is a display output terminal that indicates that light emission is possible.

IDI is an input terminal for data when communicating with the camera body 1 by infrared light, and IDO is a serial data output terminal. STOP is a light emission stop signal input terminal. SEL0 and SEL1 are output terminals for instructing the input selection of the data selector 206, and the combination of SEL0 and SEL1 is "SEL
When "1, SEL0 = Lo, Lo", the D0 terminal is connected to the Y terminal, and similarly, "SEL1, SEL0 = Lo, Hi".
At the time of D1, terminal "SEL1, SEL0 = Lo, Lo"
In this case, the D2 terminal is selected.

DAO is a D / A output terminal built in the flash microcomputer 200, and the comparators 204, 20
The comparison level 5 is output 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 the oscillation of the DC / DC converter 201. For the sake of explanation, the charge is started at Hi and stopped at Lo. INT is a terminal for controlling the start / reset of integration of the integration circuit 208. The integration is reset when Hi and integration is enabled when Lo.

AD0 and AD1 are input terminals of the A / D converter, which convert the input voltage into digital data for processing inside the microcomputer 200.
0 is for monitoring the voltage of the main capacitor C1, and AD1 is for monitoring the integrated output voltage of the integration circuit 208.

Z0 and Z1 are control output terminals for controlling a motor control circuit 211 for driving the zoom drive motor 212;
ZM0, ZM1 and ZM2 are zoom position detection encoders 2
Reference numeral COM0 denotes an input terminal for inputting a current 15 and a common terminal for drawing a current corresponding to the ground level of the zoom position detection encoder 215.

BOUNC is a port for inputting whether or not the flash is in a bounce state. TATOU is a switch input port for multi-flash strobe setting, M_Zoo
m is an input port of a manual zoom setting switch.

Next, each operation of the strobe 18 will be described.

<Detection of Light Emittable State> Strobe microcomputer 2
00 is the main capacitor C input to the AD0 port.
When the voltage of the main capacitor C1 is determined to be equal to or higher than a predetermined voltage at which light emission is possible by performing A / D conversion on the divided voltage of the first capacitor C1, a predetermined current is drawn from the CHG terminal, and the camera body 1 can emit light. Tell a certain thing. Also,
The LED terminal is set to Hi, and the LED 216 emits light to indicate that it is in a light emitting enabled state.

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 main body 1 is notified that light emission is impossible. Also, the LED terminal is set to Lo, the LED 216 is turned off, and light emission is displayed.

<Stroboscopic irradiation angle setting> The current zoom position is read from the ZM0 to ZM2 terminals, and a predetermined signal is output via the Z0 and Z1 terminals so that the zoom position specified by the camera body 1 is obtained through serial communication. To drive the motor drive circuit 211.

When the photographer manually sets the strobe irradiation angle using a manual zoom setting button (not shown), the motor drive circuit 211 is driven so as to be at a predetermined zoom position in accordance with a signal from the M_Zoom terminal.

<Preliminary Flat Flash> When the strobe is in a flashable state, the camera body 1 can communicate the light emission intensity and the flash time of the preliminary flash, and instruct the preliminary flash.

The flash microcomputer 200 is connected to the camera body 1
A predetermined voltage is set to the DAO terminal according to the predetermined light emission intensity signal instructed. Next, “Lo, Hi” is output to the SEL1 and SEL0 terminals, and the input D1 is selected. At this time, since the xenon tube 19 has not yet emitted light, the photocurrent of the light receiving sensor (PD2) 32 hardly flows, and the monitor circuit 2 input to the inverting input terminal of the comparator 205
09 is not generated, and the output of the comparator 205 is H
Since it is i, 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, excites the xenon tube 19, and starts emitting light.

On the other hand, the flash microcomputer 200 instructs the integration circuit 208 to start the integration after a predetermined time from the generation of the trigger. The integration circuit 208 outputs the output of the monitor circuit 207, that is, the light receiving sensor 31 (PD1) for integrating the light amount. At the same time as starting integration of the logarithmically compressed photoelectric output, a timer for counting a predetermined time is started.

When the preliminary light emission starts, the photocurrent of the light emission intensity control light receiving sensor 32 (PD2) for flat light emission increases, the output of the monitor circuit 209 rises, and is set to the non-inverting input of the comparator 206. When the voltage becomes higher than the predetermined comparator voltage, the output of the comparator 205 is inverted to Lo, the light emission control circuit 203 cuts off the light emission current of the xenon tube 19, and the discharge loop is cut off. A loop is formed, and the emission current gradually decreases after the overshoot due to the delay of the circuit stops. Since the light emission intensity decreases with a decrease in the light emission current, the high current of the light receiving sensor (PD2) 32 decreases, and the output of the monitor circuit 209 decreases. Is inverted to Hi, the light emission control circuit 203 conducts again, a discharge loop of the xenon 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 light emission intensity in a short cycle around the predetermined comparison voltage set at the DAO terminal. As a result, the light emission continues at the desired substantially constant light emission intensity. It is possible to control flat light emission.

The flash timer is counted, and when a predetermined preliminary flash time has elapsed, the flash microcomputer 200
Sets the SEL1 and SEL0 terminals to "Lo, Lo", selects the input D0 of the data selector 206, that is, the Lo input, forcibly sets the output to Lo, and sets the light emission control circuit 2
03 shuts off the discharge loop of the xenon tube 19 and terminates light emission.

At the end of light emission, the flash microcomputer 200
A / D outputs the output of the integration circuit 208 that has integrated the preliminary light emission.
The signal is read from the input terminal AD1 and A / D converted.
NTp).

The guide number (Qpre) for the pre-flash subject is obtained from FIG. 5 from the charging voltage of the main capacitor C1 and the irradiation angle of the strobe, and the data can be sent to the camera body by serial communication.

Since the data of the guide number (Qpre) is a theoretical value, the integrated value of the preliminary light emission may be corrected by the monitor circuit 207 and the integrating circuit 208 with the actually measured value.

<Main Light Emission Control>
An appropriate relative value (γ) of the main light emission amount with respect to the preliminary light emission is obtained from the luminance value of the subject reflected light from the multi-segment photometric sensor 7 at the time of the preliminary light emission, and sent to the flash microcomputer 200.

The flash microcomputer 200 obtains a proper integral value (INTm) by multiplying the photometric integral value (INTp) at the time of preliminary light emission by the value of the proper relative value (γ) from the camera body 1, and outputs the proper integral value to the DAO output. (INTm) is set.

Next, "Hi,
"Lo" is output, and the input D2 is selected. At this time, since the operation of the integration circuit is prohibited, the output of the integration circuit 208 input to the inverting input terminal of the comparator 204 is not generated.
Since the output of the comparator 204 is Hi, 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, excites the xenon tube 19, and starts emitting light. In addition, the strobe microcomputer 200 controls the trigger noise due to the application of the trigger and stops the actual emission of light for more than 10 μsec.
c, the integration start terminal INT is set to Lo, and the integration circuit 2
08 integrates the output from the sensor 31 via the monitor circuit 207. When the integrated output reaches a predetermined voltage set by the DAO, the comparator 204 is inverted, and the light emission control circuit 203 is turned off via the data selector 206, and stops emitting light.

On the other hand, the flash microcomputer 200 is a STOP
When the terminal is monitored and the STOP terminal is inverted to stop light emission, the SEL1 and SEL0 terminals are set to "Lo, Lo" to set the forced light emission prohibition state, and the integration start terminal is inverted to terminate the integration and emit light. The process ends.

In this way, the main light emission can be controlled to an appropriate light emission amount.

Next, an operation flow of the flash control camera system according to the first embodiment of the present invention will be described with reference to FIGS.

When the operation of the camera is started in step # 101 in FIG. 6, the camera microcomputer 100 first detects the state of the switch SW1 which is turned on by the first stroke of the release button. If the switch SW1 is off, the camera microcomputer 100 turns on the switch SW1. This operation is repeated until a detection is made. Thereafter, when the ON of the switch SW1 is detected, the process proceeds to the next step # 102, where the camera microcomputer 100 reads each operation switch of the camera (not shown) from the switch sense circuit 110, and determines a shutter speed and an aperture. Various shooting modes are set.

In the next step # 103, the mode (AF) in which the camera performs the automatic focus detection operation among the operation modes of the camera set by reading the switches described above.
Mode) or not (MF mode). If the mode is the AF mode, step # 104
The camera microcomputer 100 drives the focus detection circuit 105 to perform a focus detection operation using a well-known phase difference detection method. Further, the focus adjustment of the lens is performed by communicating with the lens side based on the resulting focus state.

As described with reference to FIG. 2, there are three focus detection points on the screen. Therefore, which point of the subject is to be focused on (distance measurement point) is determined by a method that can be arbitrarily set by the photographer, a well-known automatic selection algorithm based on near-point priority, and the like. Is determined by the photographing mode of the camera set by reading the switch. Next, the process proceeds to step # 105, where the camera microcomputer 100 sets the distance measuring point determined in step # 104 above to Focus. As P, it is stored in a RAM (random access memory) in the camera microcomputer 100. Then, Step # 106
Move to.

In step # 103, M
If the mode is the F mode, the process immediately proceeds to step # 106.

In step # 106, the camera microcomputer 100 obtains the subject luminance values of the six areas on the screen from the photometry circuit 106. The luminance value is stored in the RAM as EVb (i) i = 0 to 5.

In the next step # 107, the camera microcomputer 100 sets the subject brightness values EV in the six areas.
b, the exposure value (EVs) is determined by a known algorithm. Then, the shutter speed value (TV) and the aperture value (AV) are determined in accordance with the camera shooting mode set by the switch reading.

In the following step # 108, the camera microcomputer 100 communicates data with the lens microcomputer 112 to obtain information on the photographing lens (lens 11). Focal length (f) Minimum value of the distance to the subject (Dist_min) The maximum value of the distance (Dist_max) receives a lens special state flag (s_lens) and the like.

The reason why the distance to the subject is the minimum value and the maximum value is that the resolution of the distance information of the photographing lens to the subject is rough. For example, the distance of the photographing lens falls within a range of 1 m to 1.5 m. This means that the rings are in agreement, etc. In this case, the minimum value is 1 m and the maximum value is 1.5 m
Data.

The fact that the lens special state flag is set to 1 means that various accessories such as an ND filter are attached to the tip of the photographing lens, or that a macro photographing intermediate between the camera body 1 and the photographing lens. Indicates that the camera is in a special shooting state different from normal shooting, such as when a ring is attached.

In step # 109, the camera microcomputer 100 transmits the focal length information (f) and the like to the strobe.

If the flash is in the automatic zoom setting mode, the flash microcomputer 200 determines the focal length information (f).
Drives the motor drive circuit 211 to control the irradiation angle of the strobe.

In the next step # 110, the camera microcomputer 100 determines whether or not the switch SW2 which is turned on by the second stroke of the release button is turned on. O
If the switch is FF, the operations of steps # 101 to # 110 are repeated. If the switch SW2 is ON, the process proceeds to a series of release operations starting from step # 111.

In step # 111, the camera microcomputer 100 measures the subject luminance immediately before the preliminary light emission.
06. The luminance value is stored in the RAM as EVa (i) i = 0 to 5.

In the next step # 112, the camera microcomputer 100 issues a pre-flash command to the strobe side. In accordance with this command, the flash microcomputer 200 performs the preliminary light emission operation as described above. Next step # 11
In 3, the camera microcomputer 100 measures the subject brightness while the flat light emission of the preliminary light emission continues.
6 obtained. The luminance value is stored in the RAM as EVf (i) i = 0 to 5.

Next, the flow shifts to step # 114 in FIG.
Before the exposure operation, the camera microcomputer 100
Is raised, and the sub-mirror 25 is moved out of the optical path. Then, in step # 115, the camera microcomputer 100 calculates the difference between the subject brightness value EVf immediately before the preliminary light emission in step # 111 and the subject brightness value EVf in the above-described step # 113 when the preliminary light emission is continued. The luminance value of only the reflected light is extracted.

EVdf (i) ← LN ₂ (2 ^{EVf (i)} −2
^{EVa (i)} ) i = 0 to 5 In the next step # 116, the camera microcomputer 10
0 receives various data from the strobe side.

Preliminary light emission amount guide number (Qpre) Special strobe status flag (s_storobo) The preliminary light emission amount guide number (Qpre) is obtained by the flash microcomputer 200 from the focal length information (f) of the lens or the charging voltage of the main capacitor C1. This is the calculated value.
Also, a special strobe status flag (s_storobo)
Is set to 1 when the flash microcomputer 200 is in the special flash mode, such as when the flash is in a bounce state, in the multi-flash mode, in the wireless flash mode, or in the manual zoom flash mode. I have.

In the following step # 117, the camera microcomputer 100 determines the distance measuring point (Focus.p), the focal length (f), the preliminary light emission amount (Qpre), the lens special state flag (s_lens), and the special strobe state flag (s_storobo). ) And the like, it is selected which of the six photometric areas in which the amount of the strobe light is to be multiplied should be properly brought to the subject. The selected area is stored in the RAM as P (any one of 0 to 5). Step # 117 will be described later in detail with reference to FIG.

In step # 118, the camera microcomputer 100 performs the above-mentioned selected area (P) on the selected area (P).
It is determined whether or not the subject is an appropriate subject by comparing the focal length information (f) from the lens 11 and the distance information (Dist) from the subject, and if the subject is determined to be an abnormal reflection object. The main light emission amount is corrected.

Here, the luminance value E of only the preliminary light emission reflected light component
By correcting Vdf (p), the next step #
The main light emission relative ratio described in 119 is corrected.

At this time, the lens special state flag (s_le)
ns), special strobe status flag (s_stolob)
When either of o) is 1, the main light emission amount is not corrected.

This part is the point of the present invention, and will be described later in detail with reference to FIG.

In the next step # 119, the camera microcomputer 100 sets the exposure value (EVs) and the subject brightness (EV).
From b) and the brightness value EVdf (p) of only the preliminary light emission reflected light, a relative ratio of the main light emission that is appropriate for the preliminary light emission for the subject in the selected area (p) is obtained. r ← LN ₂ ( 2 ^EVs −2 ^{EVb (p)} ) −EVdf (p) Here, the difference between the exposure value (EVs) and the extension of the subject brightness (EVb) is obtained because the exposure when the strobe light is irradiated is This is because the strobe light is added to the external light component to control the light to be appropriate.

In step # 120, the camera microcomputer 100 sets the shutter speed (TV) and the pre-emission light emission time (t_prc), and also sets the correction factor (c) by the photographer or the relative ratio (c). r)
And a new relative ratio (r) is calculated.

Rr + TV-t_pre + c Shutter speed (TV) and pre-emission light emission time (t_
The correction by (pre) is performed by integrating the photometric integrated value (INTp) of the pre-flash and the photometric integrated value (I
NTm).

In the next step # 121, the camera microcomputer 100 sets the main light emission amount to the relative value (r) to the preliminary light emission.
To the strobe. Next, in step # 122, the camera microcomputer 100 determines the determined exposure value (E
Vs) so that the lens 11 has an aperture value (AV) based on
Command the shutter speed value (T
V) to control the shutter control circuit 107.

In the following step # 123, SWX is turned on in synchronization with the full opening of the shutter and transmitted to the strobe side, and this is the main light emission command.

The flash microcomputer 200 performs the above-described main light emission control to an appropriate amount based on the relative value (r) sent from the camera.

In step # 124, the last operation of the series of exposure operations, that is, the main mirror 2 and the like retreated from the photographing optical path are lowered and inclined again to the photographing optical path, and the motor control circuit 108 and the film running detection circuit At step 109, the film is wound up by one frame.

Next, referring to FIG.
The details of the subject area selection routine of No. 7 will be described.

In step # 201, the camera microcomputer 100 determines whether the camera is in a mode in which the camera performs an automatic focus detection operation (AF mode) as in step # 103 or in a mode in which it is not (MF mode). , AF
If it is the mode, the process proceeds to step # 205 and thereafter.

On the other hand, if the mode is the MF mode, step # 20
Proceeding to 2, the camera microcomputer 100 determines whether the lens special status flag (s_lens) and the special strobe status flag (s_storobo) are both 0 or 1 and either is 1 Since the lens 11 or the strobe 18 is in the special state, the process proceeds to step # 211 without performing steps # 203 and # 204.

Therefore, lens focal length information (f) is not taken into account when selecting a subject area where flash light is appropriate.

If both of the two flags are 0, the process proceeds to steps # 203 and # 204 to select a subject area in consideration of the lens focal length information (f).

That is, in step # 203, the camera microcomputer 100 determines, based on the focal length information (f), the preliminary light emission amount (Qpre), and the predetermined constant (c1), that if a subject such as a person is located farther away, The pre-emission reflected light component (EVdf) at a position where it becomes too small for one photometry area is determined. It is set to 1.

This situation will be described with reference to FIGS. 11 (a) and 11 (b).

When a person is large in one photometry area as shown in FIG. 11A, the amount of the preliminary emission reflected light (EVdf) can be accurately measured in that area. However, when the person becomes smaller with respect to one photometry area as shown in FIG. 11A, the preliminary light emission does not return to the photometry area outside the person. Therefore, the preliminary light emission reflected light component (EVdf) becomes lower than that assumed assuming that there is a gray wall having the standard reflectance at the position of the person, and as shown in step # 119, the amount of main light emission is reduced by that amount. As we try to make it bigger, we control too much.

Based on such an idea, the level set at the boundary of whether or not a large overshoot occurs is lev
el. It is one.

This level. 1 is, for example, a focal length of 5
In the case of a 0 mm lens, the value of the preliminary light emission reflected light component (EVdf) when there is a gray wall having a standard reflectance at about 3 m is taken.

In the next step # 204, the camera microcomputer 100 calculates the preliminary emission reflected light (EVdf (Focus.P)) at the distance measuring point by the aforementioned level.
l. It is determined whether the value is greater than 1 and, if so, the process proceeds to step # 211. Level. When it is smaller than 1, the process proceeds to step # 205 and thereafter.

At step # 205, when the camera is in the mode in which the automatic focus detection operation is not performed (MF mode), the reflected light for preliminary light emission (EVdf (Focus.
P)) is level. When the distance measurement point cannot be selected as an area where the strobe light amount is to be appropriately set because the distance is smaller than 1, the camera microcomputer 100 determines from the central three points (E0, E1, E2) the area where the subject is closest to the camera (E0, E1, E2). Close.P). This is based on the idea that the closest one of the subjects is most likely to be the main subject.

This includes the preliminary emission reflected light component (EVdf).
(I)) The maximum i among i = 0 to 2 is Clos
e. P.

In the next step # 206, as in step # 202, the camera microcomputer 100 sets the lens special state flag (s_lens) and the special strobe state flag (s_storobo) to either 0 or 1; It is determined whether or not there is, and if either is 1, the lens 11 or the strobe 18 is in a special state, and the process proceeds to step # 212 without performing steps # 207 and # 208.

Therefore, lens focal length information (f) is not taken into account when selecting a subject area where flash light is appropriate.

If the two flags are both 0, the process proceeds to steps # 207 and # 208 to select a subject area in consideration of the lens focal length information (f).

That is, in step # 207, the camera microcomputer 100 determines, based on the focal length information (f), the preliminary light emission amount (Qpre), and the predetermined constant (c2), that if the subject such as a person is farther away, The pre-emission reflected light component (EVdf) at a position where it becomes too small for one photometry area is determined. It is 2.

Level. 2 corresponds to the above step # 203
Level. 1, but based on the concept of placing greater emphasis on distance measurement points, level. Since the value is set to be higher than that of 1, it is easy for the subject such as a person to escape even if the subject is somewhat close.

Level. 2 is, for example, 50 m focal length
In the case of a lens of m, the value of the preliminary emission reflected light component (EVdf) when a gray wall having a standard reflectance is about 2.5 m is taken.

In the next step # 208, the camera microcomputer 100 sets the preliminary emission reflected light (E
Vdf (Focus. P)) is the same as the level. 2
Determine if it is greater than, step # if greater
Proceed to 212. Level. If it is smaller than 2, the process proceeds to step # 209 and below.

In step # 209, the preliminary emission reflected light component (EVdf (Focus.P)) at the closest point
Is level. If it is smaller than 2, it means that the subject such as a person is quite far or exists in the peripheral part of the screen, so the three central areas (E0, E1,
Not only E2) but also the surrounding areas (E3, E4) are taken into consideration, and the area to be brought appropriately is selected.

Here, regarding this step # 209,
This will be described in detail with reference to FIG.

In step # 401, the camera microcomputer 100 substitutes 3 for a variable i. Then, in the next step # 402, the camera microcomputer 100 compares the preliminary emission reflected light component (EVdf (3)) of the area E3 with the aforementioned l.
evel. Compare with 2. As a result, the preliminary emission reflected light component (EVdf (3)) becomes level. If it is lower than 2, the process proceeds to step # 403, and EVdf (i) ← (EVdf (i) + level.2)
/ 2. This is because, as shown in FIG. 11B, when the main light emission amount is calculated using the preliminary light emission reflected light amount (EVdf) in the area E3 around the area E0, the subject is not calculated with respect to the area E3. , A considerably small preliminary emission reflected light component (EVd
f) is also smaller than when there is a gray wall of standard reflectance, and is based on the idea of correcting to a larger value.

In addition, the preliminary emission reflected light component (EVdf)
(3)) is level. If higher than 2, step # 4
04, and EVdf (i) ← level. 2 This is a peripheral sensor such as E3. When the preliminary light emission reflected light component (EVdf) is considerably large, there are many cases where a table or other obstacle is in front of the subject, and the exposure to the obstacle matches the main object. This is based on the idea that the correction is made to a small value so that the subject does not become under, and consequently the correction is made to the over side.

In the next step # 405, the camera microcomputer 100 substitutes +1 for a variable i, and sets it to i and 4. Next, in step # 406, when the variable i is 4 or smaller, steps # 402 to # 405 are repeated, and the same processing is repeated for the sensor of E4. After that, since the variable i becomes 5, this routine ends.

Returning to FIG. 8, in step # 210, the camera microcomputer 100 sets the preliminary emission reflected light (EVdf (Close.
P)) and areas E3 and E4, and the point which is the largest in the preliminary emission reflected light component (EVdf) corrected in step # 209, is selected as the area where the strobe light amount is to be properly set, and this routine is ended.

In step # 202,
When either the lens special status flag (s_lens) or the special strobe status flag (s_storobo) is 1, it is different from a normal system, so that it is not possible to make the determination in steps # 203 and # 204. Therefore, the process proceeds to step # 211 to select the distance measuring point as an area where the strobe light amount is to be appropriately set, and ends this routine. The preliminary emission reflected light (EVdf (Focus.P)) at the distance measurement point is level. When the distance measurement point is larger than 1, the subject such as a person is sufficiently large with respect to the photometry area corresponding to the distance measurement point, and the preliminary emission reflected light component (EVdf) can be accurately measured. The area where the strobe light amount should be properly set is selected and the routine ends.

In step # 206, if either the lens special status flag (s_lens) or the special strobe status flag (s_storobo) is 1, the system is different from the normal system. The discrimination as in # 208 cannot be performed. Therefore,
Proceeding to step # 212, the closest point (Close.
P) is selected as an area to which the strobe light amount should be appropriately set, and this routine ends. Also, the preliminary emission reflected light component (EVdf (Close. P)) at the nearest point is l
evel. The fact that the value is larger than 2 means that the subject such as a person is sufficiently large with respect to the photometry area corresponding to the close point, and that the preliminary emission reflected light component (EVdf) can be accurately measured. Is selected as an area to go to properly, and this routine ends.

Next, the details of the abnormal reflection correction routine in step # 118 will be described with reference to FIG.

In step # 301, the camera microcomputer 100 sets the lens special state flag (s_lens)
It is determined whether the special strobe state flag (s_storobo) is either 0 or 1 and if either is 1, the lens 11 or the strobe 18 is in a special state and this routine is immediately terminated. Therefore, no extraordinary reflection correction is performed.

If both of the two flags are 0, the process proceeds to step # 302 and thereafter, where abnormal reflection correction is performed.

First, in step # 302, the camera microcomputer 100 determines that a subject such as a person is located at a position closer than this based on the focal length information (f), the preliminary light emission amount (Qpre), and a predetermined constant (c3). The pre-emission reflected light component (EVdf) at an almost impossible position is obtained, and le
vel. It is set to 3.

This level. 3 is, for example, a focal length of 5
In the case of a 0 mm lens, the value of the preliminary light emission reflected light component (EVdf) when a gray wall having a standard reflectance is about 0.5 m is taken. This is based on the idea that, with a lens having a focal length of 50 mm, the shortest photographing distance is about 0.5 m, so that the subject cannot be any closer.

At the next step # 303, the camera microcomputer 100 sets the preliminary light emission reflected light (EVdf) of the selected area to which the strobe light amount is to be appropriately set.
(P)) and level. 3 and if the preliminary light emission reflected light component (EVdf (P)) is small, this routine ends.

The preliminary emission reflected light component (EVdf)
(P)) is level. Step 3 if greater than 3
304, and EVdf (P) ← level. This routine ends as 3. Thus, by correcting the preliminary light emission reflected light component (EVdf (P)), the main light emission amount is corrected to the over side.

As described above, when the lens 11 and the strobe light are in a special state, control different from that of a normal system is performed. The reason is described below.

When the ND filter is used, the amount of pre-emission light is attenuated when returning from the subject, so that a position where the subject is likely cannot be specified from the photometric value.

Further, when a close-up lens and an intermediate ring are used, it is highly possible that the subject distance becomes particularly short as compared with normal photography because of macro photography.

Even in the case of using other lens accessories, control different from that of a normal system is performed based on the same concept as the above two.

Next, when there are multiple strobes, a plurality of strobes may be pre-emitted at the same time, and the same control cannot be performed because the photometric value of the pre-emission is different from that of a single strobe.

When the strobe is a manual zoom, the photographer may intentionally shoot at a strobe irradiation angle different from the shooting angle of view for the purpose of creating a drawing effect. Therefore, it is better not to perform control such as correction. Is obtained.

In the present embodiment, the method of determining the area to be selected for correcting the main light emission amount and appropriately controlling the strobe light is changed depending on whether the lens 11 and the strobe 18 are in the normal state. Thus, a strobe control camera capable of always obtaining a proper exposure amount was realized.

(Second Embodiment) FIGS. 12 and 13 relate to a strobe control camera system according to a second embodiment of the present invention. More specifically, FIG. 9 is a flowchart showing an operation of a main part when the present invention is applied to a camera that measures light reflected on a film surface. Note that parts common to the first embodiment described above are omitted.

FIG. 12 replaces the flowchart of FIG. 7 in the first embodiment. Steps # 614 to # 617 are replaced with steps # 114 to # 1 of FIG.
Since it is almost the same as 17, the description is omitted.

Step # 618 is an abnormal reflection correction routine replacing step # 118 in FIG.
This will be described later in detail with reference to the flowchart of FIG.

In the next step # 619, the shutter and the aperture are controlled as in step # 122 of FIG. 7, and the exposure operation starts. Then, in step # 620,
Since the SWX is turned on in synchronization with the full opening of the shutter, this ON signal is transmitted to the strobe 18 side, and this is the main light emission command.

In the following step # 621, the camera microcomputer 100 drives the film surface photometry circuit 114 simultaneously with the main light emission command,
To start photometry. In the following step # 622,
When the camera microcomputer 100 determines that the integrated photometric value of the film surface photometric circuit 114 reaches a predetermined value for the area selected in step # 617, the camera microcomputer 100 sends a flash stop command to the flash unit to control the flash light amount. . The predetermined amount at this time is a value corrected by the abnormal reflection correction in step # 618 described later. Finally, step # 62
In step 3, similarly to step # 124, the main mirror 2 and the like retreated from the photographing optical path are lowered and inclined again to 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. Perform the operation.

Next, referring to FIG. 13, step # 61
The details of the abnormal reflection correction routine in step 8 will be described.

In steps # 701 to # 703,
Since these steps are almost the same as steps # 301 to # 303 in FIG. 9, the description thereof will be omitted.

In step # 703, the camera microcomputer 100 calculates the preliminary light emission reflected light amount (EVdf (P)) and l
evel. 3 and the preliminary emission reflected light component (EVdf
If (P) is smaller, the process proceeds to step # 704, where 0 is substituted for the correction amount (com_level), and this routine ends.

The preliminary emission reflected light component (EVdf)
(P)) is level. Step 3 if greater than 3
703 to # 705, and com_level ← EVdf (P) -level. This routine ends as 3.

As a result, the correction amount of the main light emission amount is obtained, and in step # 622, (correct-com_level
In 1), the main light emission is controlled and corrected to the over side.

As described above, in the second embodiment,
Even in the case of strobe light control based on photometry of reflected light from the film surface, even if the strobe control camera system is special, a simple strobe control camera capable of always obtaining an appropriate exposure amount without complicating the device was realized.

According to each of the above embodiments, the strobe 1
8 and the lens 11 to determine whether the shooting is normal shooting or special shooting, and differentiates the correction calculation of the main light emission amount according to the result of the determination, and the selection of the photometry area for calculating the strobe light amount is different. As a result, it is possible to provide an easy-to-use strobe control camera system that can control the amount of strobe light so that an appropriate amount of exposure can always be obtained in any shooting.

(Correspondence between the Invention and the Embodiments) In each of the above embodiments, the multi-segment photometric sensor 7 corresponds to the pre-emission reflected light multi-segment photometer of claim 1 or the pre-emission reflected light multi-segment photometer of claim 2. The camera microcomputer 100 corresponds to an arithmetic unit and an area selecting unit for correcting the amount of main light emission of the present invention, and the strobe microcomputer 200 and the switches SWT and SWM.
Z or the lens microcomputer 112 and the accessory attachment detection switch 43 correspond to the state determination unit of the present invention.

The flash microcomputer 200, the main condenser C1, the xenon tube 19, and the light emission control circuit 203 are the main components of the light emission amount control means of the present invention. Control circuit 203, comparator 205,
The data selector 206 is a main component of the preliminary light emission control means of the present invention.

The correspondence between the components of the embodiment and the components of the present invention has been described above. However, the present invention is not limited to the configuration of the embodiment, and the functions and features described in the claims are not limited.
Needless to say, any configuration may be used as long as the functions of the embodiment can be achieved.

(Modification) In each of the above embodiments,
The fact that the strobe control camera system is not in the normal state but in a special state is not limited to the above example.
In addition to the above, various objects such as a multi-strobe mode in which one strobe emits light a plurality of times during the exposure operation are conceivable, and it goes without saying that the present invention can be applied to these.

Although the focal length information of the lens is used for the abnormal reflection correction, it may be corrected by the subject distance information.

Further, it is automatically detected and determined that an accessory such as an ND filter is attached to the taking lens. However, the present invention is not limited to this. It may be set in the control camera system.

Further, the strobe is not limited to a separate body from the camera body, and can be applied to a strobe integrated camera (camera with a built-in strobe).

Although the present invention has been described as applied to a single-lens reflex camera, the present invention can be applied to a lens shutter camera and other cameras.

[0181]

As described above, according to the present invention,
Whether the camera system is in a normal system state or a special system state, that is, a multi-flash strobe system state, a manual zoom strobe state, or a special state of a lens when an intermediate ring is attached or a close-up lens is attached. Accordingly, the result of the correction calculation of the main light emission amount is different, and the selection of the photometry area for calculating the strobe light amount is different, so that the flash exposure always provides the proper exposure amount regardless of the state of the camera system. Becomes possible.

[Brief description of the drawings]

FIG. 1 is an arrangement diagram of an optical system of a flash control camera system according to a first embodiment of the present invention.

FIG. 2 is a photometric area division diagram according to the first embodiment of the present invention.

FIG. 3 is a block diagram illustrating a schematic configuration of a camera body and a lens according to the first embodiment of the present invention.

FIG. 4 is a block diagram showing a schematic configuration of a strobe light according to the first embodiment of the present invention.

FIG. 5 is a diagram for explaining a preliminary light emission guide number according to the first embodiment of the present invention.

FIG. 6 is a flowchart showing a part of a main operation of the camera microcomputer of FIG. 3;

FIG. 7 is a flowchart showing an operation subsequent to FIG. 3;

FIG. 8 is a flowchart showing details of a subject area extracting operation in step # 107 of FIG. 7;

FIG. 9 is a flowchart showing details of an abnormal reflection correction operation in step # 108 of FIG. 7;

FIG. 10 is a flowchart showing details of a reflected light correction operation for a peripheral area in step # 209 of FIG. 8;

FIG. 11 is a diagram for explaining a relationship between a distance measurement area and a size of a subject in the first embodiment of the present invention.

FIG. 12 is a flowchart showing a part of a main operation of a camera microcomputer of a flash control camera system according to a second embodiment of the present invention.

FIG. 13 is a flowchart showing details of the abnormal reflection correction operation in step # 618 of FIG.

FIG. 14 is a diagram illustrating an example of special shooting.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Camera body 7 Multi-segment photometry sensor 11 Lens 18 Strobe 19 Xenon tube 100 Camera microcomputer 200 Strobe microcomputer 205 Comparator 206 Data selector C1 Main capacitor SWT Switch linked to multiple light setting button SWMZ Switch linked to manual zoom setting button

Claims (8)

[Claims] 1. A strobe control camera system which performs main light emission toward a subject during an exposure operation and performs strobe photographing. A preliminary light emission control means for performing preliminary light emission prior to main light emission, and a preliminary light emission measuring means for measuring subject reflected light of the preliminary light emission. Emission reflected light metering means, arithmetic means for calculating a light quantity correction value of main emission based on the photometry result of the preliminary emission reflected light metering means, and main emission for correcting and controlling the amount of main emission based on the result of the arithmetic means A flash control camera comprising: a quantity control unit; a state determination unit for determining a state of the camera system; and a correction calculation control unit for making a correction calculation by the calculation unit different based on the state determination result. system. 2. A strobe control camera system for performing main light emission toward an object during an exposure operation and performing strobe photographing. A pre-emission control means for performing pre-emission prior to main light emission; Is divided into a plurality of areas to measure the amount of light, and preliminary light emission reflected light multi-segment metering means for measuring the light amount of the main light emission of the plurality of areas according to the light measurement result of the preliminary light emission reflected light multi-segment metering means. Area selection means for selecting, main light emission amount control means for controlling the main light emission amount based on the result of the area selection means, state determination means for determining the state of the camera system, and An electronic flash control camera system, comprising: an area selection control means for differentiating the area selection by the area selection means. 3. The strobe control camera system according to claim 1, wherein the state determination means determines the state of the camera system automatically or by an input accompanying a manual operation. 4. The strobe control camera system according to claim 1, wherein said state determining means determines whether or not the apparatus is in a multi-flash strobe system state. 5. The strobe control camera system according to claim 1, wherein the state determination means determines whether or not the camera is in a manual zoom strobe state. 6. The strobe control camera system according to claim 1, wherein the state determination means determines whether the lens is in a special state. 7. The strobe control camera system according to claim 6, wherein the special state of the lens is a state in which an intermediate ring is mounted on the lens. 8. The flash control camera system according to claim 6, wherein the special state of the lens is a state in which a close-up lens is mounted as a lens.