JP3445312B2 - Camera strobe control - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is mounted on a camera,
Externally installed to compensate for the lack of light
Strobe control device to control the light intensity of the flash unit
About the installation. [0002] 2. Description of the Related Art Conventionally, cameras with built-in strobes
Externally to compensate for the lack of built-in flash light.
There is a strobe device for multiple lights. This built-in flash
To control the strobe light amount of the camera, for example,
The flashmatic method that calculates the required light quantity from the
Used. This flashmatic method increases
The light strobe device uses the built-in flash to emit light.
Is controlled and there is no electrical contact with the camera
There are forms. [0003] Regarding the control of the built-in strobe,
Check the calculated value against the data map consisting of light intensity and light emission time.
For example, Japanese Patent Laid-Open No.
No. 298924, and its improved version
It is described in the proposed Japanese Patent Application No. 3-170188. In addition, the start and stop of light emission of the built-in strobe light
, And starts and stops its own light emission.
For the boring device, refer to Japanese Patent Application Laid-Open No. 53-116149.
First, several types are known. Further, only the start of light emission is received from the built-in flash.
Lighting and light quantity control are controlled by the external light metering function.
For example, Japanese Patent Application Laid-Open No. 1-178944
And various types such as Japanese Unexamined Patent Publication No.
I know. [0006] However, the above-mentioned Japanese Patent Application Laid-Open
Strobe device for multi-flash according to JP-A-53-116149
Basically, the photometry system of the camera is TTL. Da
Since it is assumed that direct photometry is adopted,
If the flashmatic method is used, the built-in flash
The light emission time required to emit light at
When a large external flash is fired,
In some cases, the amount is emitted. And originally, external strobe
You want to supplement the light intensity with the flash.
In the remote area, the external flash cannot be controlled.
You. Further, according to Japanese Patent Laid-Open No. 1-178944,
Is a strobe device for multi-flashMeasuredCamera for light
A mechanism to set the aperture value and film sensitivity of
Complex operation makes it inconvenient for ordinary users
It will be a bad thing. Further, according to Japanese Patent Application Laid-Open No.
In some cases, the flash
When the flash is repeated at a distance, it flashes around the built-in flash
The heat of the time may cause the muffled diffuser to become cloudy or increase.
The light receiving element on the strobe side of the lamp also has a delayed response,
It is possible that light may not be received due to sticking
You. [0009] Accordingly, the present invention provides a light emitting time of a built-in strobe.
The light of the strobe device for multi-flash can be
Providing a camera strobe control device that efficiently controls the amount
The purpose is to do. [0010] The invention achieves the above object.
The built-in flash inside the camera body
For cameras that can use a built-in flash,
Full light emission amount storage means for storing the full light emission amount of the flash
And the appropriate amount of light to determine the appropriate amount of light from the built-in flash.
Calculating means, and the light amount difference between the full light emission amount and the appropriate light amount
Calculation means for calculating the light emission amount of the built-in flash
Built-in flash table for control
Light emission time stored as the relationship between the light intensity difference from the light and the light emission time
The storage means and the light amount difference obtained by the difference calculation means
From the light emission table stored in the light emission storage means.
The built-in flash is controlled based on the flash time
Shooting using flash control means and external strobe
Detection means for detecting that the
It was detected that shooting was performed using an external flash
IfThat both strobes fire at the same time
ToStored in the full light emission amount storage means.The above built-in switches
Trobo'sShift the amount of full light emission by a predetermined amount in the higher direction
A camera having a setting changing means. [0011] [0012] [Function] The camera with the above configuration is compatible with the built-in flash.
The difference between the full light emission amount and the appropriate light amount
To control the amount of light emitted from the built-in flash
A light emitting table is defined, and the light emitting table is
The built-in flash based on the flash time
When the flash is controlled and an external flash is used,Both sides
To correspond to the simultaneous flash firingFull departure
Full light emission of the built-in flash stored in the light storage
Is changed to the light amount corresponding to the external flash. [0013] BRIEF DESCRIPTION OF THE DRAWINGS FIG.
Will be described. FIG. 1 shows a first embodiment according to the present invention.
Schematic configuration and description of the camera's flash control device
I do. In this strobe control device, there is no illustration.
Based on the distance and photometric information obtained by the
The flash emission amount Gvx to obtain the proper exposure
And the maximum flash output of the built-in flash
A full light emission amount storage unit 34 for storing the actual value Gxm;
A difference calculation unit 3 that calculates these results to obtain the difference ΔGv
2 and the result of the difference calculator 32, the built-in flash
Emission amount-emission time characteristicsOf the difference based on full emission
In addition to storing the relationship between the Gv value ΔGv and the emission time,
Part corresponding to maximum flash timeIs stored as ΔGv = 0.
Difference output / emission time storage section 35, and the difference output / emission time
The required light emission time is obtained from the interval storage unit 35, and the flash circuit 3
6 and a light emission time control unit 33 that drives
Automatically or manually using a flash strobe device
Flashlight strobe use detector 38 that detects whether or not
And a detection signal indicating the use of a strobe device
The flash output of the built-in flash by any amount.
In order to reduce the amount of light, the
Full flash output setting to change the stored maximum flash output setting
And a fixing unit 37. The full light emission amount setting unit 37 controls the actual
Set the amount of light larger than the maximum amount of light by any number of steps.
And ΔGv obtained by the difference calculation unit 32 is
It becomes larger by the number of steps, and the built-in flash emission time is shorter
Is set. FIG. 2 shows the first embodiment described above.
Shows the specific circuit configuration of the camera strobe control device.
explain. Here, the charge and light emission circuit section
It is described in Japanese Patent Application No. 05-001977 proposed by the applicant and others.
The circuit configuration and operation are the same as the
Description is omitted. This strobe control device includes a strobe for a flashlight.
Boost the potential supplied by the battery power supply 1 of the battery device (energy
Main transformer 5 for boosting the
Main capacitor 8 for storing energy and STON signal
A trigger coil 9 for generating a trigger output in response to a signal
It is excited by the Riga output and
An Xe tube 10 that emits light by electric current, and this Xe tube 10
Light emission was stopped by interrupting the flowing current.
IGBT 11 is provided. The switch SW1 is connected to the entire strobe.
Power switch.
The charging voltage stored in the capacitor 8 is changed by the resistors 12 and 13.
And the divided signal Vst is predetermined by the comparator 14.
To the reference voltage obtained. The output from the comparator 14
The transistor 2 is turned on / off by the input CHG signal,
The operation of the electric circuit section is controlled, and the charging voltage is kept within a certain range.
It is. Further, the phototransistor 15
The built-in flash of the camera (not shown)
The transistor 17 is differentiated by the capacitor 16 and the transistor 17 is turned off for a short time.
The transistor 18 is turned on by turning the transistor 18 on.
As a result, "H" is output to the STON terminal. Soshi
The light emitting circuit unit starts emitting light in response to the STON signal.
Start. Next, the built-in flash stops emitting light.
When the phototransistor 15 is turned off,
The capacitor 16 shifts from charging to discharging, and the transistor 20
Base → transistor 20 emitter → diode 19
A current flows in the direction from the capacitor 16 to the resistor 21. This
Transistor 20 is turned on by the current of
The collector 22 is turned on, and the collector current causes the transistor 22 to turn on.
The register 23 is turned on. And the IG of this light emitting circuit section
When the gate voltage of the BT11 is short-circuited,
Turned off, breaking the path of current flowing through Xe tube 10
Light emission stops. FIG. 4 shows such a strobe control device.
The waveform at the time of operation of the main part is shown. This strobe controller
Responds to the built-in flash of the camera (not shown)
To emit light to the emitter side of the phototransistor 15
Rise of waveform B obtained by differentiating voltage A by capacitor 16
As a result, the transistor 17
While flowing, it is turned on and “H” is output to the STON terminal.
Is forced. External light has high brightness due to light emission of the built-in strobe
While the phototransistor 15 is turned on.
Although the transistor 17 is held by the action of the capacitor 16,
Is off. And the built-in flash stops emitting light
When external light falls, the phototransistor 15 is turned off.
As a result, a current flows from the capacitor 16 to the discharge path. This
, The capacitor 16 is in the direction of drawing current from the point B side.
And the base-emitter current of transistor 20
That is, the transistor 20 is turned on, and the IGB
A signal STOFF for short-circuiting the gate end of T11 is generated.
You. FIG. 3 shows a second embodiment shown in FIG.
Of the flash control unit other than the charge / light emission circuit
The road is controlled by the CPU, and the flash
Auto flash function for light control and flash control by measuring light
This is an example of the configuration in the case of having. In this strobe control device, the switch
By switching the switch SW3, the phototransistor 1
The external light received at 5 'is expressed by the external light luminance shown in FIG.
Tell the circuit to take the timing of the descent, or
Is the input to the integration IC for photometric external light.
Can be obtained. The switch SW2 is an automatic switch.
When operating as a strobe, camera conditions, such as flash
A switch for setting aperture information and the like at the time. Switch S
W4 separates the flash strobe device from the camera and turns it on.
When used in the camera state, whether or not the camera is installed
Switch, for example, a strobe
The switch operates when the bottom of the device is attached to the camera.
Position where the switch does not operate when placed on the floor
To automatically determine whether the camera is on-camera or off-camera.
Let me separate. In addition, the external light auto
Automatic selection of flash control with camera built-in flash
Alternatively, the switch SW3 may be switched by the CPU.
It is possible. Next, FIGS. 5 and 6 show the stroboscope shown in FIG.
An example of the operation when using the
You. FIG. 5 shows the relationship between the charging voltage and the charging voltage in the strobe circuit section of FIG.
Monitor Vst with A / D converter of CPU
Control the CHG signal to keep the charging voltage above a certain level.
This shows the state to be held. Where C is the main capacitor
8, the voltage D of the sub-capacitor 25,
_MCH Is the charge completion voltage, V_MCL Indicates a charging restart voltage. This
These values are E^Two The adjustment value is stored in the storage unit such as PROM
And memorize it. Also to control by CPU
Means that the sub-capacitor 25 shown in FIG.
The gate voltage of the IGBT 11 does not decrease
It may be set to an arbitrary value of the degree. FIG. 6 shows a phototransistor similar to FIG.
It corresponds to the light emission of the built-in flash of the camera
Received by the CPU, and the CPU emits light to the flash circuit.
Outputs signal STON and emission stop signal STOFF
Indicates that At this time, when the flash starts, the camera is
Since light operation has started, it is necessary to start up quickly.
Although it is directly transmitted to the light emission signal without going through the PU, STOF
F is delayed by an arbitrary time in response to the signal of the transistor 22 '.
After that, a light emission stop signal can be issued. That is,
In the present embodiment, the strobe control device shown in FIG.
Can be used even with the much smaller built-in flash light. FIG. 7 shows a flash unit for a multi-flash according to this embodiment.
Configuration diagram of the control circuit of the camera with built-in flash used together
It is. Each component and circuit of this camera with built-in flash
It shall be controlled by CPU42. Soshi
Therefore, a strobe circuit 41, which is one of the control circuits, is a known flash circuit.
Power supply circuit 41a, main capacitor 41b,
Gas circuit 41c, flash arc tube 41d, IGBT 41e,
It is composed of a port control circuit 41f. The IGBT4
1e is connected in series with the flash tube 41d,
Under the control of the output of the circuit 411f, the signal is generated in a known manner.
The light emission time of the light tube 41d is controlled. Gate control circuit 41
f receives the output from the CPU 42 in the camera and
The ON timing and the ON period of the GBT 41e
Control. The photometry time of the components of the control circuit of the camera
The road 47 measures the luminance of the subject as is known, and
To U42, and based on the data, the camera's exposure mechanism
Is controlled. The distance measuring circuit 48 calculates the distance to the subject.
Put out. The lens drive circuit 49 is connected to the output of the distance measurement circuit 48.
Drive the camera lens based on the force. Hoisting circuit
45 controls film winding and rewinding as is known.
I will. The shutter circuit 44 receives the output of the CPU 42
To control the shutter mechanism. The mode setting circuit 46
Time for the user to select the on / off mode of the Trobo
Road. The storage circuit 43 has an E₂Such as PROM
It is composed of a storage element and has a full emission light amount storage unit and a difference output / output
Built-in optical time storage, etc.₂PROM etc.
The number of frames already shot by the memory device,
The actual amount of lightBuilt-inG of the full flash output of the strobe
G of v value_vmAnd the uncorrected file in the difference output / emission time storage unit.
Δ is a difference output of the Gv value based on the Gv value of the light emission.
Table showing the relationship between Gv and light emission time (table described later)
Indicates the correction value of the light emission characteristics according to the data of 1) and the charging voltage
It stores data of a table (Table 2 described later) and the like. The switch SW1 is the first switch of the release switch.
This is a switch that is turned on in one stage, and a switch SW2
Is a switch that is turned on by the second stage of the release switch.
Ji. The CPU 42 has an appropriate light amount calculating section 42.
a, a difference calculation unit 42b, and a light emission time calculation unit 42c.
ing. Then, the appropriate light amount calculation unit 42a performs the photometry
Route 47 and the output of a film sensitivity input unit (not shown).
Gv value G of strobe light amount for positive exposure_vxIn the search for
is there. Further, the difference calculation unit 42b stores the difference
Gv value G of the actual full light emission of the strobe_vmAnd before
The appropriate Gv value G_vxAnd the Gv value of the difference, that is, the value (G
_vm-G_vx) Is calculated. The light emission time calculator 42c includes a memory circuit 4
Refer to the table (Table 1) of the difference output / emission time storage unit of No. 3.
And the strobe light emission corresponding to the difference Gv value ΔGv
Ask for time. For example, if the value ΔGv is 2.5 (Ev)
Then, the light emission time is 125 μs. Meanwhile, the charging voltage
Is not the full voltage, the CPU 42
The Gv value is corrected with reference to the reference. About the details of this correction
Will be described later. FIG. 8 shows each charging voltage (330 V to 210 V).
Gv value ΔGv of difference based on full emission value in V)
Characteristic curve G showing the change of the light emission time with respect to_v0~ G_v4Line
FIG. Table 1 shows the characteristics at the time of full charge in FIG.
The emission time (unit) for each difference value ΔGv (unit Ev)
μs). Table 2 shows the Gv values shown in FIG.
For the full charging of the emission time characteristic line at each charging voltage,
The deviation from the characteristic line at full flash
Of the difference value ΔGv (unit Ev) based on the Gv value at the time of light emission
It is indicated by the number of correction steps (unit Ev) for each number of steps. [0036] [Table 1][0037] [Table 2] In FIG. 7 described above, an external flash (
Light strobe device) is attached to the camera.
The signal from the external flash detection unit 50 for disconnecting
U42 has received it. The external strobe detecting unit 50 automatically
The mode setting circuit 46 does not
The flash mode for multiple flashes
No. External strobe detection by installing a strobe device for additional lighting
In response to the input from the unit 50, the CPU 42
The maximum flash amount of the built-in flash in the storage circuit 43 is G_vmage
Thus, the calculation of ΔGv is replaced with a large ΔGv (+).
In order to replace with the maximum light emission amount, the full light emission amount setting unit 42
By d, G_vm+ ΔGv (+) G_{vm '} And on
To obtain the required light emission amount ΔGv. Then G_vmRequested by
ΔGv (+) result is larger than ΔGv
On the contrary, the emission time obtained from Table 1 is short.
You. Next, the operation of such a strobe control device will be described.
This will be described with reference to FIG. Usually built-in flash
Controls the light emission time with the light emission control curve starting from point l
Have been. The point l is stored in the storage circuit 43.
This is the point at which the maximum flash output of the built-in flash is emitted. When the loading of the strobe device for increasing light is detected,
The maximum light emission is assumed to be ΔGv (+) higher than the actual light.
(+3 Gv in FIG. 9), and
In order to calculate the required light quantity, the light emission control starting from point p
It will shift to your curve. However, it is actually built-in
The maximum flash output does not increase.
The amount of light required by the camera is the maximum flash output of the built-in flash
Even if a certain m point is found, the actual light emission amount is n points. First, the curve starting from the point L is left as it is.
The maximum flash output of the built-in flash
In the distance, the maximum light emission time is the maximum, and shooting is performed with changes in the light emission time
Change in distance cannot be transmitted to strobe device
However, if the control of the p-point start point is performed, the light emission
Is tn, light emission for the shooting distance from point m to point p
Time change can be obtained, actual built-in flash emission
Rather than controlling the flash strobe device with time,
Information can be conveyed to the strobe device for additional lighting
You. At this time, the built-in flash becomes ineffective and the flash
Near the point m where a robo unit is required, the built-in flash
Light is small and does not affect exposure and is quite far away
Near the point p, even if the built-in flash fires at full capacity,
You do not need to affect the outgoing. Also, the data of the full light emission amount is replaced.
It is not necessary to have a separate emission time characteristic table
And the effect on ROM capacity is minimal.
Control of the device can be realized. Next, FIG. 10 shows the flash control of this embodiment.
Camera with built-in strobe that uses device light emission control method
Of combination of multiple flash units controlled by multiple lights
It is. This strobe device 62 for additional lighting is roughly divided into
The light emitting unit 63 and the camera 61 for incorporating into the camera
Skirt part 64 attached to the bottom so that it can be inserted
And 66. The front skirt 66 is the camera body
61 built-in strobe has such a shape,
Furthermore, the phototransistor for photometry shown in FIG.
Is installed. On the upper surface of the camera body 61,
Switch for detecting that the electronic flash 62 is assembled
68, this switch can be mechanical or optical
Any other detection method may be used. Further, a flashlight strobe by the mode switch 69 is provided.
Bo mode setting is also possible. Set to the camera shown in FIG.
The switch for judging whether or not
The strobe 62 is provided on the bottom surface 65 of the
When placed on a floor, etc., the skirt 64, 66
This switch does not touch the floor, strobe 62 is slave
Functions as an auto flash. FIGS. 10 (b) and 10 (c) show the flashlight switch.
This is an example of a case where a trobo is placed on a floor or the like. Photo tiger
The skirt 66 with the integrated transistor is
Focusing on the fixture (in front of the flash unit
2), the external light metering type
Light receiver for reflected light from the subject when used as a flash
Work as FIG. 11 shows that the strobe device 62 for increasing light is a turtle.
FIG. Next, FIG.
A third embodiment of a camera strobe control device according to Akira
Is shown and described. Turtle with built-in strobe
The configuration for external strobe control on the
You. In this flash control device, no illustration is made.
Based on the distance and photometric information obtained by the
The flash emission amount Gvx to obtain the proper exposure
And the maximum flash output of the built-in flash
Full light emission amount storage unit 34 'for storing the actual value Gxm of
And calculating the difference to calculate the difference ΔGv
Calculation unit 32 'and the result of the difference calculation unit 32'
The emission amount-emission time characteristic of the storage strobe is the maximum emission time ΔG
Difference output / emission time storage unit 35 'stored as v = 0
And necessary light emission from the difference output / light emission time storage unit 35 '.
Time control for driving the strobe circuit 36 '
Unit 33 'and a strobe device for increasing the number of lights automatically or manually
Detects whether a flash is being used or not.
It comprises a unit 38. The difference output / emission time storage section 35 '
For obtaining the flash time during normal built-in flash photography
Constant emission time control data and strobe light detection unit 38 'for increasing light
The built-in flash fires when a signal indicating use is detected in
In order to control the light emission of the strobe device for additional lighting depending on the time
And the flashlight emission time control data. Yo
Therefore, when using a flash unit for multi-flash,
Flash with built-in flash
To emit light, and the light emission of the flashlight device is controlled. Next, the flow charts shown in FIGS.
With reference to FIG.
Will be described. First, the photographer
Release switch half-pressed, that is, the first stage SW1
When turned on, the subroutine "REL" in FIG.
And distance measurement / photometry is performed (step S11).
Of the lens (Step S12) and the subject
Dv value of logarithmic conversion value of distance d (log_Two d^Two Indicated by
Is calculated (step S13). Further, the Dx core of the loaded film
(Step S14) and the logarithmically converted value
Sv value (log_Two (Indicated by (ISO sensitivity / 100))
calculate. Next, the central part and the peripheral part of the light receiving element for photometry
The logarithmic conversion values of the luminance data of
_VS, Peripheral brightness value B_VaAs the brightness value B_VSAnd brightness value B
_VaAre compared to determine whether the subject is backlit (step S1).
5) If it is smaller than a predetermined amount (YES), that is, if it is dark,
The value Sv and the brightness value B are determined as backlight._VSAdd the dew
It is read as an Ev value which is a light value (step S18).
However, if it is larger than the predetermined amount by this determination (NO),
If it is bright, it is determined that it is not backlight, and the value S
v and luminance value B_VaIs added and read as an Ev value (step
Step S16). Based on this Ev value, the shutter time
Is calculated (step S17). Next, it is determined whether or not to perform light emission (step
Step S21). This camera uses flash-related modes
Has a normal flash that fires only when the Ev value is low.
Flash mode and flash off mode without flash firing.
There is Also, even if light emission is required, it does not meet the conditions
Exposure is sometimes prohibited, in which case the file is
The LED in the camera blinks to warn the photographer. In the determination in step S21, the flash
When the mode is determined to be the flash mode (YES),
Is set to "0" to prohibit light emission (step S4).
1) Set the uncharged lock flag to "0" (step
S42), the exposure is permitted, and the process proceeds to step S43.
Transition. Further, in the determination of step S21, the strike
If the mode is the normal mode for performing the robo light emission (NO),
Calculate camera shake time according to the zoom status at that time
(Step S22). Then, in the step S17,
Shutter speed and the camera shake time are compared (step
Step S23), the second is earlier (YES), and further backlit
(Step S24), and if it is not a backlight (N
O), the process proceeds to a step S41, and the light emission flag is set to “0”.
To prohibit light emission and set the uncharged lock flag to “0”.
After the exposure is allowed, the process proceeds to step S43.
You. In step S23, the second time is later.
If not (YES), replace the seconds with the shake seconds
(Step S25) Also, in the step S24, the backlight
When it is determined (YES), the process proceeds to the next step S26.
I do. In step S26, as shown in FIG.
For additional lighting according to the detection signal from the external flash detector 50
It is determined whether or not the mode is the strobe use mode. In this judgment,
When using the strobe for lighting (YES),
Is set to "1" (step S27) and the built-in flash
The Gv value of the full light emission is corrected (step S28), and the next step is performed.
The process moves to step S29. This correction is performed according to FIG.
For example, +3 Gv. Also, in the determination of step S26,
In the case of the normal shooting mode (NO), step S
Move to 29. It is to be noted that in step S26, the
If the strobe flag is "1",
Is the light emission time corresponding to the required light quantity.
Correction of full light emission value due to different charging voltage levels
The calculation may be performed without performing the above. Next, it is determined whether to permit strobe light emission.
In step S29, the charging voltage is equal to or higher than 310 V
If the charging voltage is 310 V or more (YES),
The process proceeds to step S35 to be described later, and the charging voltage is
If less than (NO), the charging voltage is 200 V or more
Is determined (step S30). With this determination, the charging voltage
If less than 200V (NO), the charging voltage is too low
There is a possibility that no light is emitted, so set the light emission flag to “0”.
To prohibit light emission (step S39), and
Is set to "1" (step S40), and exposure is permitted.
Then, the process proceeds to step S43. In step S30, when the charging voltage is 200
When the voltage is equal to or more than V (YES) and less than 310 V, each charging voltage
Value and G for proper exposure when full light is emitted in_vx
(Steps S32 and S33). Next, the Gv value of full light emission and the Gv value of proper exposure
The Gv value of the full emission is compared with the value (step S34).
If the image is smaller (NO), the camera cannot perform proper shooting
The process proceeds to steps S39 and S40, and
Light emission is prohibited by setting the light flag to "0", and
Set the flag to “1” to disable exposure.
Then, the process proceeds to step S43. However, the step S
In the judgment of 34, the Gv value of the full light emission is compared with the Gv value of the proper exposure.
If larger (YES), the process proceeds to step S35.
I do. In this step S35, the step S
If the charging voltage is 310 V or more in the determination of 29,
Alternatively, the charging voltage is 200 V or more and less than 310 V and
If the Gv value of light emission is large compared to the Gv value of proper exposure,
In this case, the light emission flag is set to “1” to permit light emission (step
Step S35), the non-charge lock flag is set to “0” (step S35).
Step S36), setting the state to allow the exposure and emitting light
Is calculated (step S37). That
Thereafter, the light emission time is stored in the storage circuit 43 shown in FIG.
Gv value G of actual full emission to be remembered_vmAnd Gv of proper exposure
Value G_vxOutput / emission time using the difference ΔGv
(Table 1)
S38). At this time, use of the flash unit
When the middle detection signal is detected, the full light emission amount is increased by +3.
The emission time is shifted by 3 Gv by the amount of Gv.
Light is emitted in search of light time. Next, when the release switch is half-pressed,
First, start timing the 90-second timer.
(Step S43). Then, set the uncharged lock flag
It is determined (step S44). The flag
In the case of “0”, exposure is permitted, and
Check the second stage switch SW2
(Step S52) However, when the flag is “1”,
Check the second-stage switch SW2 of the release switch
Without performing, circulates through the processing loop while the release switch is half-pressed
I do. And the strobe LED every 250μs
Is reversed so that the photographer does not
To inform that exposure cannot be performed (step S4).
5, 46). Next, the state of the first-stage switch SW1 is turned off.
(Step S47) or the 90 second timer has expired.
Return when the flow (step S48)
Exits this subroutine "REL". When an overflow or the like of the timer is detected,
Unless there is a charge voltage check (step S4
9) If the charging voltage has reached 330 V (YES),
The charging signal is turned off to stop charging (step S5).
0), if the charging voltage is less than 330 V (NO),
The signal is turned on to continue charging, and both are performed in step S44.
To continue the loop processing during half-press. In the determination in step S52, the second stage
If the switch SW2 is on (YES), the exposure operation
In order to perform the operation, the strobe LED is turned off (step S5).
3) The charging signal is turned off to stop charging (step S).
54), the lens is extended to the in-focus position (step S5)
5). Next, a subroutine "SHUTR" is called.
And shutter control is performed (step S56). So
After that, one frame of the film is wound up (step S5).
7) Exit from this subroutine "REL". Referring to the flowchart of FIG.
Explanation of the subroutine "SHUTR" sequence
I do. First, pass through the magnet for locking the shutter blades.
(Step S60), the shutter drive motor is driven.
(Step S61), the timer for the second time and the time until the light emission
The process is started (steps S62 and S63). Then, the shutter time required for proper exposure is
Elapsed (step S64) or strobe emission
A determination is made as to whether the time until has elapsed (step S65).
U. First, the time until the light elapses before the shutter time elapses
If so, the light emission flag is determined (step S6).
6). If the flag is "0" in this determination, the
Waiting for the passage of time without performing light (step S70),
When the lag is "1", light emission is started (step S6).
7) The required light emission amount obtained in step S38 of FIG.
Wait for the corresponding light emission time to elapse (step S68).
After that, light emission is stopped (step S69). In step S64, the shutter time is
If it has passed (YES), de-energize the magnet
(Step S71), or in step S70
When the shutter time has elapsed (YES), the routine returns.
To end the loop of this subroutine "SHUTR".
You. Next, a camera according to a fourth embodiment of the present invention will be described.
The flash control device will be described. This strobe device
Is similar to that of FIGS. 1 and 7. Also the camera body
When using only the built-in flash described in FIG.
The process is the same as described above. First, the CPU 42 comprises a light metering circuit 47 and a distance measuring circuit.
Based on the information from the road 48, etc.,
Calculates and calculates the maximum value of the built-in flash
The difference between the large light emission amount and the light emission time
Data is obtained, and the flash circuit 36 is controlled. Then, a strobe device for increasing light is attached to the camera.
External flash detection by automatic or manual operation
The detection signal is sent from the unit 50 to the CPU 42. Receiving this
The CPU 42 has previously provided a difference output / emission time storage unit.
The required light emission amount is emitted according to the 35 emission time tables.
Emission time was determined, but this is called the emission time
Increased just to correspond to the required light quantity calculated
Calculate the flash time from the flash strobe flash time control table
To control the built-in flash. At this time, the emission time table has a built-in flash.
There is no correlation with the amount of light_v0(Or Gv)
Flashlight for multiple flashes that only corresponds to one flash time
It informs the device of the required amount of light during the light emission time. Therefore, the light emission amount calculated by the calculation and the data
The flash for the duration of the light that is guided by the data table
It is not necessary to match the actual light amount of the built-in flash at the time.
The amount of light required for the maximum flash time is
What is necessary is just to set to an arbitrary light quantity based on the light quantity of a button. next
Table 3 shows the two data tables described above.
is there. [0077] [Table 3] [0078] [Table 4] As described above, an entirely different data table is used.
By preparing a
It is possible to send information to the flash unit
If there is a camera that stores the data table of
Even if the built-in flash has different emission characteristics,
Thus, it is possible to control the strobe device for increasing the number of lights.
The built-in flash is used on the side of the strobe device for lighting.
Receiving the light from the robo
May be controlled. In this case, the CP shown in FIG.
A configuration in which central control is performed by U is preferable. Then, about the photographing sequence of the camera
Is almost the same as the sequence described in FIG.
In the first embodiment, the light emission time calculation is output as a difference output.
/ The value obtained from the light emission time storage table is
In the example, the correspondence table of the light emission time setting to the simple required Gv
The points obtained are different. As described above, the camera according to this embodiment
The control unit is a flashmatic type light control type.
Camera with strobe device
Dimming without the use of electrical contacts during the flash time of the built-in strobe
And a long distance where the built-in strobe emits full light
Flash light can be adjusted even in the
Flash time data for built-in flash control
It becomes possible by changing to the Robo usage time data.
And at the same time, useless built-in
Reduces strobe light emission and prevents power waste
You. Further, the present invention is limited to the above-described embodiment.
There are no other variations within the scope of the invention.
Of course, shapes and applications are possible. [0082] According to the present invention as described in detail above,
The flash control of the flash unit is controlled by the flash time of the built-in flash.
By providing a flash control data table
Light emission characteristics of the flash unit
It is not limited by the amount of light, etc.
It is possible to increase the number of strobes in the camera, and the built-in strobe
By simply changing the maximum flash output data of
Strobe control data for a flash
Has the same effect as having a
Lighting strobe with almost no effect on volume
Providing a camera strobe control device that can control the light emission of the device
Can be offered.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a schematic configuration of a strobe control device for a camera as a first embodiment according to the present invention. FIG. 2 is a diagram showing a specific circuit configuration of a flash control device of the camera according to the first embodiment shown in FIG. 1; FIG. 3 is a diagram showing a configuration example of a strobe control device as a second embodiment according to the present invention. 4 is a diagram showing waveforms during operation of main parts of the strobe control device shown in FIG. 2; FIG. 5 is a diagram showing voltage characteristics in the strobe circuit section shown in FIG. 2; FIG. 6 is a diagram showing waveforms during operation of main parts of the strobe circuit unit shown in FIG. 2; FIG. 7 is a diagram showing a configuration of a control circuit of a camera with a built-in strobe used together with the strobe device for increasing light of the first embodiment. FIG. 8 is a diagram showing a characteristic curve showing a change in light emission time with respect to a Gv value ΔGv of a difference based on a full light emission value at a charging voltage in the first embodiment. FIG. 9 is a diagram showing characteristics of light emission control of the built-in strobe and characteristics of light emission control of the built-in strobe when an external strobe is used in the first embodiment. FIG. 10 is a diagram showing an example of a combination of a built-in flash camera and a flash unit for increasing the flash, which employs a light emission control method of the flash control device of the first embodiment. FIG. 11 is a diagram showing a state in which a strobe device for increasing light is mounted on a camera. FIG. 12 is a diagram showing a schematic configuration of a flash control device for a camera as a third embodiment according to the present invention. FIG. 13 is a diagram showing a configuration of a control circuit of a camera with a built-in strobe used together with a strobe device for increasing light of the third embodiment. FIG. 14 is a flowchart of a shooting sequence “REL” of the electronic flash control device of the first embodiment. FIG. 15 is a flowchart of a shooting sequence “REL” of the electronic flash control device of the first embodiment. FIG. 16 is a flowchart of a shooting sequence “REL” of the electronic flash control device of the first embodiment. FIG. 17 is a flowchart of a shooting sequence “SHUTR” of the flash control device of the camera of the first embodiment. [Description of Signs] 1 ... Battery power supply, 2, 3, 4, 17, 18, 20, 22,
23: Transistor, 5: Main transformer, 6, 7, 1
9: diode, 8: main capacitor, 9: trigger coil, 10: Xe tube, 11: IGBT, 12, 13, 2
Reference numerals 1, 24: resistance, 14: comparator, 15: phototransistor, 16, 25: capacitor, 31: proper light amount calculation unit, 32: difference calculation unit, 33: light emission time control unit, 34: full light emission amount storage unit, 35: difference output / light emission time storage unit, 36
... A strobe circuit, 37... A full light emission amount setting section, 38.

Claims (1)

(57) [Claim 1] In a camera having a built-in strobe in a camera body and capable of using an external strobe, a full light emission amount storage means for storing a full light emission amount of the built-in strobe. A proper light amount calculating means for calculating a proper light amount of the built-in strobe; a difference calculating means for calculating a light amount difference between the full light amount and the proper light amount; and a light emitting table for controlling a built-in strobe light amount. Light emission time storage means for storing the relationship between the light amount difference from the full light emission amount of the strobe and the light emission time; and light emission obtained from the light emission table stored in the light emission storage means for the light amount difference obtained by the difference calculation means Light emission control means for controlling light emission of the built-in strobe based on time, detection means for detecting shooting using an external strobe, and detection means By If it is detected to be photographed using the external flash, simultaneous onset both strobe
A camera which comprises setting change means for shifting the full light emission amount of the built-in strobe stored in the full light emission amount storage means in a direction higher by a predetermined amount to correspond to light emission.