JPH04371940A - Split irradiation type flash lighting system, camera on which split irradiation type flash lighting device can be mounted, and the same - Google Patents

Abstract

PURPOSE:To control a light distribution by using one flash light tube, to reduce the size and weight of the device, and to reduce heat generation in continuous use and prevent an irregularity in light distribution. CONSTITUTION:The device consists of a light emission part and a light quantity control part which is arranged in front of the light emission part and controls the quantity of light emitted from plural light projection areas corresponding to plural irradiated areas of a subject field, and is equipped with a flash light means 21 which performs preliminary light emission and main light emission, split light measuring means 23 and 33 which splits luminous flux emitted by this flash light means 21 and reflected by the subject field into plural areas and measures the light, a calculating means 35 which calculates weighting quantities at the time of the main light emission by the projection areas of the flash light means 21 according to light measurement results obtained by the split light measuring means 23 and 33 at the time of the preliminary light emission of the flash light means 21, and a control means 35 which controls the quantities of projection light by the projection areas of the flash light means 21 according to the weighting quantities calculated by the calculating means 35.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a divided irradiation type flash illumination system, a divided irradiation type flash device, and a divided irradiation type flash illumination system that changes the light distribution at the time of flash emission according to the distribution of objects in the subject field. The present invention relates to a camera to which a device can be attached.

0002

2. Description of the Related Art A divided irradiation type flash device is known that controls the light distribution according to the spatial distribution of an object (see, for example, Japanese Patent Laid-Open No. 115148/1983). This device is equipped with a plurality of flash tubes, and controls whether each flash tube emits or does not emit light to separately irradiate different areas within the screen to be photographed.

0003

However, such conventional divided irradiation type flash devices have the following problems. (1) Since a plurality of flash tubes and a light distribution optical system corresponding to each flash tube are required, the entire device becomes large and heavy. (2) Since a plurality of flash tubes emit light, a large amount of energy is used and a large amount of heat is generated during continuous use. (3) Since a plurality of flash tubes and a light distribution optical system corresponding to each flash tube are required, irradiated light may overlap or drop out at the boundaries of each divided area, resulting in uneven light distribution. (4) A light control device is required to control each of the plurality of flash tubes, making control complicated.

An object of the present invention is to provide a divided irradiation type flash illumination system, a divided irradiation type flash device, and a divided irradiation type flash illumination system that can control the light distribution using one flash tube and thereby solve the above problems. An object of the present invention is to provide a camera to which a type flash device can be attached.

[0005]

[Means for Solving the Problem] The invention of claim 1 will be explained in conjunction with FIG. 1(a) which is a claim correspondence diagram. A flash means 21 for performing preliminary light emission and main light emission; The luminous flux emitted by and reflected by the subject,
Divided photometry means 23, 33 that measures light by dividing it into multiple areas
When the flash unit 21 flashes preliminary light, the divided photometry units 23 and 3
Calculating means 35 calculates the weighting amount at the time of main emission for each of the plurality of emission areas of the flashing means 21 based on the photometry results obtained in step 3; A control means 35 is provided for controlling the amount of emitted light for each of the plurality of emitting areas, thereby achieving the above object. In addition to the above-mentioned invention of claim 1, the invention of claim 2 is such that the shape of the division pattern of the plurality of divided photometry areas of the divisional photometry means 23, 33 and the shape of the division pattern of the plurality of emission areas of the flashing means 21 are almost the same. Shape. The invention of claim 3 will be explained in conjunction with FIG. 1(b), which is a diagram corresponding to the claim. The camera is equipped with a divided irradiation type flash device 21 that is composed of a light amount adjustment section that can adjust the amount of light emitted from a plurality of emission areas corresponding to the areas, and performs preliminary light emission and main light emission. divisional photometry means 23, 33 that divides and measures the luminous flux emitted by the type flash device 21 and reflected in the subject field into a plurality of areas; and divisional photometry means 23, 33 during preliminary flashing of the divisional irradiation type flash device 21. A calculation means 35 calculates the weighting amount for main emission for each of the plurality of emission areas of the split irradiation type flash device 21 based on the photometry results measured by the split irradiation flash device 21, The flash device 21 is provided with a control means 35 for controlling the amount of light emitted from each of the plurality of emitting areas, thereby achieving the above object. The invention of claim 4 is, in addition to the invention of claim 3,
The shape of the division patterns of the plurality of divided photometry regions of the divisional photometry means 23 and 33 and the shape of the division patterns of the plurality of emission regions of the divisional irradiation type flash device 21 were made to be approximately the same shape. The invention according to claim 5 includes a light emitting section, a light emitting section disposed in front of the light emitting section,
This is a split-irradiation type flash device that is composed of a light amount adjustment unit that can adjust the amount of light emitted from a plurality of emission areas corresponding to the irradiation area of the subject, and performs preliminary flash and main flash. The light intensity adjustment section of the flash device adjusts the weighting amount for each of the plurality of emission areas, which is calculated based on the photometry results of dividing the luminous flux emitted from the light emitting part and reflected in the subject field into a plurality of areas during preliminary flashing. is input, and the amount of light for each of the plurality of emission areas during main emission is adjusted according to the weighting amount. The invention of claim 6 provides, in addition to the invention of claim 5, a division pattern shape when photometry is performed by dividing into a plurality of regions at the time of preliminary light emission, and a division pattern shape of a plurality of emission regions of a divisional irradiation type flash device. have almost the same shape.

[0006]

[Operation] According to claim 1, the calculation means 35 calculates each of the plurality of emission regions of the flash means 21 at the time of the main light emission based on the photometric values of each divided region measured by the divided light metering means 23 and 33 at the time of the preliminary light emission. The weighting amounts are calculated, and the control means 35 controls the amount of emitted light for each of the plurality of emitting areas using the flashing means 21 according to these weighting amounts. In claim 3, the calculation means 35
calculates the weighting amount at the time of main emission for each of the plurality of emission areas of the split irradiation type flash device 21, based on the photometry results measured by the split photometry means 23 and 33 during the preliminary flash of the split irradiation type flash device 21, The control means 35 controls the amount of emitted light for each of the plurality of emitting areas in the divided irradiation type flash device 21 according to these weighting amounts. In claim 5, the light amount adjustment section of the split irradiation type flash device calculates the light amount based on the photometry results obtained by dividing the luminous flux emitted from the light emitting section during preflash and reflected in the subject field into a plurality of areas. The amount of weighting for each of the plurality of emission areas is input, and the amount of light for each of the plurality of emission areas at the time of main emission is adjusted according to the weighting amount.

[0007] In the section of the means for solving the above-mentioned problems and operations which explains the structure of the present invention, the same reference numerals as the elements of the embodiments corresponding to the reference numerals of each means are used to make the present invention easier to understand. However, the present invention is not limited to the examples.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 2 to 6 are diagrams for explaining the outline of the present invention. In these figures, 1 is a camera according to the present invention, 2a and 2b are angles of view of photographic lenses, 3 is a light distribution characteristic of a conventional flash device, and A to E are objects. First, as shown in FIG. 2, when the subjects A to E are lined up at the same distance from the camera 1, all the subjects A to E are exposed with proper exposure even with a conventional flash device.

However, as shown in FIG.
are arranged diagonally away from camera 1,
In the conventional flash device having the light distribution characteristic 3, all the subjects A to E are not exposed with proper exposure. In other words, subject C will be properly exposed, but subject A will be overexposed, subject B will be slightly overexposed, and subject D will be slightly underexposed.
Subject E will be undershot. Therefore, in the present invention, as shown in FIG. 4, the light distribution characteristics are set as shown in 4, and all subjects A to E are exposed to light at appropriate exposures.

Furthermore, as shown in FIG. 5, when objects A to E are lined up in a V-shape, all objects A to E cannot be exposed with proper exposure using a conventional flash device with light distribution characteristic 3. . In other words, subjects A and E are under-photographed, and subjects B and D are under-photographed.
will be slightly under. In such a case, in the present invention, as shown in FIG. 6, the light distribution characteristics are set as shown in 5, and all the subjects A to E are exposed with proper exposure.

FIG. 7 is a diagram showing the configuration of a TTL automatic light control camera 11 according to the present invention. During viewfinder observation, the light flux (stationary light) that has passed through the photographic lens 12 is reflected by the mirror 13 in the down state shown by the broken line, passes through the screen 14 and the pentaprism 15, and a part of it is guided to the eyepiece lens 16. The other part passes through the condenser lens 17 and is guided to the exposure control photometric element 18 . Further, during photographing, when a shutter release button (not shown) is released, the mirror 13 is driven to the up position shown by the solid line, the aperture 19 is narrowed down, and the shutter 20 is opened and closed. As a result, the subject light that has passed through the photographic lens 12 is guided to the film FI, and the film FI is exposed.

Furthermore, during flash photography, the shutter 20
After opening, the flash device 21 emits the main light to illuminate the subject. The reflected light from the subject reaches the film surface via the photographic lens 12, and the light beam reflected on the film surface is
The light is guided through a condensing lens array 22 to a light receiving element 23 for dimming. Furthermore, the camera of this embodiment is capable of preflashing to check the state of the subject before the main flash, and the light reflected from the subject due to this preflash is reflected from the curtain before the shutter 20 opens. The light is reflected by the surface and received by the light receiving element 23.

FIG. 8 is a control block diagram of a camera equipped with a flash device according to the present invention. In the figure, 11 is
This is a camera to which a divided irradiation type flash device 21 can be attached or connected. The exposure control photometric element 18 is connected to the photographic lens 12
The light flux (mainly stationary light) that has passed through is divided into five areas 18a to 1
Measure the light by dividing it into 8e. In addition, the light receiving element 23 for dimming is
The light beam (mainly flash) that has passed through the photographic lens 12 is divided into five areas 23a to 23e and received. Reference numeral 31 denotes a focus detection element such as an image sensor, which detects the focus adjustment state of the photographic lens 12 in a region 31a using the light beam that has passed through the photographic lens 12. Note that the focus detection area 31a is
It is included in the divided light control area 23a.

A photometric circuit 32 logarithmically compresses the output signal of the exposure control photometric element 18 and converts it into a luminance value. 3
3 is a dimming circuit which amplifies the output signal of the dimming light receiving element 23 and integrates it over time. 34 is a focus detection circuit, which calculates the amount and direction of focus shift of the photographic lens 12 based on the output signal of the focus detection element 31. 35 is CPU
The exposure value is calculated based on the brightness value from the photometry circuit 32, the flash stop control of the flash device 21 is performed according to the output signal from the dimming circuit 33, and the flash control is performed according to the amount and direction of deviation from the focus detection circuit 34. It performs drive control of the photographing lens 12, etc.

36 is a light emission control circuit, which controls the flash tube 3 according to the light emission start and light emission stop command signals from the CPU 35.
7 is driven and controlled. Reference numeral 38 denotes a light distribution control circuit, which will be described later, and is arranged in front of the flash device 37, and controls the light distribution for controlling the luminous flux emitted by the flash tube 37 for each emission area corresponding to the illumination area of the object. The control element 39 is driven and controlled.

FIG. 9 is a diagram showing details of the area around the dimming light receiving element 23 that receives the light beam emitted from the flash device 21 and reflected in the field of view. A light-adjusting light-receiving element 23a corresponding to a circular photometry area in the center of the field, and light-adjustable light-receiving elements 23b to 23e corresponding to a photometry area in the shape of a circular arc cut out of a rectangle at the periphery of the field. , placed on the same plane. That is, in this embodiment, the field of view is divided into five photometry areas and divided photometry is performed. The condensing lens array 22 is an optical member having three lens portions corresponding to the left, middle, and right three blocks of the light receiving elements 23a to 23e.

As shown in FIG. 9, when the field projected on the curtain surface of the shutter 20 is divided into five areas, a central circular area 20a and four areas 20b to 20e, the light receiving elements 23a to 23e The three blocks on the left, middle, and right of
It faces the left half, center, and right half of 2. Furthermore, since the light-receiving element 23 and each area of the field projected on the curtain surface of the shutter 20 are approximately conjugate, the five areas 20
The brightness of a to 20e is divided into approximately the same shape and measured.

FIG. 10 is a circuit diagram showing details of the dimming circuit 33. The light control circuit 33 includes light receiving elements 23a to 2 for light control.
Amplifiers 41a to 41e that amplify the output of 3e, and the CPU
The gain setting devices 42a to 42e respectively set the amplification factors of the amplifiers 41a to 41e in response to commands from the CPU 35, and the gain setting devices 42a to 42e convert digital signals from the CPU 35 into analog signals. It has a D/A converter. Also, in response to commands from the CPU 35,
Integrating circuits 43a to 43e that integrate the outputs of the amplifiers 41a to 41e during the preliminary light emission over time, an adding circuit 44 that adds the outputs of the amplifiers 41a to 41e during the main light emission, and responding to commands from the CPU 35. Addition circuit 44
an integration circuit 45 that integrates the addition result over time, and a CPU 3
A conversion circuit 46 that converts the dimming level as an analog signal stored in advance in 5 into a digital signal compares the converted dimming level with the output of the integrating circuit 45, and determines that the output of the integrating circuit 45 is The comparator 47 outputs a light emission stop signal when the dimming level is reached.

FIG. 11 is a configuration diagram of the flash device 21, FIG. 12 is a diagram showing the emission area of the light distribution control element 39 corresponding to the irradiation area of the object, and FIG. 13 is a diagram showing the emission area of the light distribution control element 39. FIG. 14, which is a diagram showing another example of the emission area, is a configuration diagram when the light distribution control element 39 is made of a translucent ceramic PLZT. The light distribution operation of the object field by the light distribution control element 39 will be explained with reference to these figures. The flash device 21 includes a flash tube 37, a reflector 51, a light distribution lens 52, a light distribution control element 39, and deflection plates 54 and 58 disposed before and after the light distribution control element 39. It has a protective glass 53.

The light distribution control element 39 is made of transparent ceramic PLZT, liquid crystal, or the like, and is arranged in front of the flash tube 37 as shown in FIG. Then, the amount of light emitted from each emission area corresponding to the irradiation area of the object field is adjusted. These injection regions are divided into five regions 55a to 55e, as shown in FIG. 12. Note that by dividing the emission area of the light distribution control element 39 into smaller parts as shown in FIG. 13, the light distribution of the object field can be controlled more finely. Furthermore, when the light distribution control element 39 is made of a translucent ceramic PLZT, as shown in FIG.
7 is provided, and a voltage is applied between these electrodes 56 and 57 to change the light transmittance of the ceramic.

FIG. 15 shows the weighted voltage V(n) applied between the transparent electrodes 56 and 57 of the light distribution control element 39;
It is a figure which shows the relationship with the light transmittance T(n) of translucent ceramic PLZT. In this embodiment, a substantially linear range B to C is used with point A in the figure as a reference.

Here, the emission area 55a of the light distribution control element 39 corresponding to the irradiation area at the center of the field is divided into the central divided photometry area 18a of the exposure control photometry element 18 and the light receiving element 23 for light adjustment. corresponds to the central divided photometric area 23a, and they are set to have approximately the same shape. The emission areas 55b, 55c, 55d, and 55e of the light distribution control element 39 corresponding to the irradiation areas of the other four objects are also the divided photometry areas 18b, 18c, and 18c of the exposure control photometry element 18, respectively.
18d, 18e, and the divided photometric areas 23b, 23c, 23d, and 23e of the dimming light receiving element 23, and are set to have substantially the same shape for each area.

FIG. 16 is a flowchart showing an example of the main control program for the CPU 35. The operation of the embodiment will be explained using this flowchart. The CPU 35 starts executing the main control program when a shutter release button (not shown) is pressed halfway and then fully pressed. In step S1, in the case of automatic exposure mode, the photographing aperture value F is determined based on a known program chart. Note that in manual exposure mode, the photographer's settings are read. In the following step S2, an absolute distance encoder (not shown) of the photographing lens 12 determines the photographing distance X to the main subject.
Detect. In step S3, the inter-electrode voltage V(n) of the light distribution control element 39 is used as a weighted voltage for preliminary light emission.
(n=1 to 5) is set to 100. As shown in FIG. 15, when the interelectrode voltage V(n) is set to 100, the light transmittance T(n) of the light distribution control element 39 is 0.8, which is close to the maximum.
This increases the efficiency of preliminary light emission.

In step S4, the light distribution control circuit 38 is controlled to set the weighted voltage V(n)=100 (n=1 to 1) between the electrodes of the light distribution control element 39.
5) is applied. In step S5, a subroutine to be described later is executed, and the flash device 21 performs a preliminary light emission prior to the main light emission, and the light receiving element 23 divides the reflected light from the object field during the preliminary light emission into areas and measures the light. Next step S6
Then, a subroutine to be described later is executed to calculate a weighted voltage V(n) at the time of main light emission based on the photometry result at the time of preliminary light emission. In step S7, the calculated weighted voltage for main emission is applied between the electrodes of the light distribution control element 39 via the light distribution control circuit 38, and the main emission is weighted for each emission region. In step S8, the main flash of the flash device 21 is started, and in step S9, the light is adjusted in the central divided photometry area 23a of the light receiving element 23, and when a predetermined dimming level is reached, the main flash of the flash device 21 is started. Stop.

FIGS. 17 and 18 are flowcharts showing the preliminary light emission processing subroutine. In step S11, the guide number GNp1 per preliminary light emission is set to 2. That is, in this embodiment, chop light emission with guide number 2 is performed multiple times as preliminary light emission. In step S12, the gain Gpre(n) given to the gain setters 42a to 42e of the dimming circuit 40 is determined using the following equation. Gpre(n)=γ(AV-3+log2(1/5
)) ...(1) Here, γ is a constant, AV
is the apex value at the time of preliminary light emission. Step S13
, reset the chop light emission counter Qpre,
In the following step S14, the counter Qpre is incremented. In step S15, guide number G
The flash device 21 performs chop light emission at Np1 (=2).

In step S16, photometry is performed during chopped light emission. In other words, the luminous flux emitted from the flash device 21 and reflected in the field during chopping flash is transmitted to the photographing lens 12.
is reflected by the curtain surface of the shutter 20, and is transmitted through the condensing lens array 22 to five divided light receiving elements 23a to 23.
The light is received at e. Each of the divided light receiving elements 23a to 23e outputs a photometric signal corresponding to the amount of light received by each of the divided light receiving elements to the amplifiers 41a to 41e of the sequential dimming circuit 33. Amplifiers 41a-41
e transmits these photometric signals to gain setters 42a to 42e.
The integration circuits 43a to 4 are amplified with a gain Gpre(n) of
Output to 3e. The CPU 35 includes integral circuits 43a to 43.
Integrating circuits 43a to 43e, which output an activation signal to e and receive this activation signal, integrate the amplified photometric signals from amplifiers 41a to 41e at respective times, and convert the photometric signal I
It is output to the CPU 35 as G(n) (n=1 to 5).

In step S17, the total sum IG of the photometric signals IG(n) from the five divided photometric areas of the light receiving element 23 is calculated, and in step S18, it is determined whether the total photometric signal IG has reached a predetermined dimming level. If the predetermined dimming level is reached, the process proceeds to step S20, and if not, the process proceeds to step S19. When it is determined in step S18 that the predetermined dimming level has not been reached, in step S19,
Determine whether the number of chop flashes Qpre is 16 or not, and
If so, the process advances to step S20; otherwise, the process returns to step S14. The total IG of the photometric signals reaches the predetermined dimming level, or the number of chop flashes Qpre is 16.
If it is the second time, the process advances to step S20, and the total photometry time tpre required for photometry for preliminary light emission is measured. Step S21
Then, the steady light is measured using the same optical system that measures the preliminary light emission of the flash device 21, and a photometric value Ipst(n) is obtained. Note that the photometry time tpst of this steady light is the same time as the total photometry time tpre during preliminary light emission.

Next, in steps S22 to S28 of FIG.
Correction of the stationary light component and calculation of the guide number GNrtn are performed for each of the five divided photometric regions of the light receiving element 23. First, in step S22, the area number n is cleared, and in step S22, the area number n is cleared.
23, increment n. In step S24,
The constant light component Ipst is subtracted and corrected from the photometric signal IG(n) including the preliminary light emission component of the flash device 21 and the constant light component, and the value is reused as the photometric signal IG(n). In step S25, it is determined whether the corrected photometric signal IG(n) is positive or not. If it is positive, the process proceeds to step S26, and if not, the process proceeds to step S27. In step S26, GNrtn is calculated using the following equation. GNrtn(n)=(GNp12×Qpre)1/
2×(230/IG(n)×
2AV-2×1/5)1/2
...(2)

0029
According to equation (2), GNrtn(n) is a value obtained by multiplying the aperture value F by the photographing distance X when the subject in each region has a standard reflectance. In other words, F×X=GNrt
In the area n(n), it is considered that there is a subject with standard reflectance at the position of shooting distance It is considered that there exists an object with a rate of F×X<GNrt
In the region n(n), it is considered that an object with a reflectance lower than the standard reflectance exists at the position of the shooting distance X. On the other hand, when it is determined in step S25 that the photometric signal IG(n) is not positive, in step S27, a very large number that can be considered infinite, 999 in this case, is set for GNrtn(n), and the process proceeds to step S28. . In step S28, it is determined whether the area number n is 5, that is, whether the above processing has been completed for all the divided photometry areas, and when the process is completed, the process returns to the main program.

FIG. 19 is a flowchart showing a weighted voltage calculation processing subroutine during main light emission. In step S31, the irradiation amount (irradiation correction amount) to be corrected according to the area is calculated from the photographing distance after focusing and GNrtn. The irradiation correction amount ΔEV(1) of the central divided photometry area corresponding to the light receiving element 23a is as follows: ΔEV(1)=0

...(3) Also, the irradiation correction amount ΔEV(n) of the divided photometry area corresponding to the light receiving elements 23b to 23e (n=2 to 5)
is ΔEV(n)=2×log2(GNrtn(n
)/(X×F))...(4)

Step S
At step 32, since an extreme amount of correction may cause uneven light distribution, limit processing is performed to limit the amount of correction. That is, when ΔEV(n)>+1, ΔEV(n)=
+1, and when ΔEV(n)<-2, ΔEV(n)=
-2. The reason why we changed the limit values for positive and negative values was to place emphasis on preventing overexposure of the closest value. In step S33, the light transmittance of each emission area of the light distribution control element 39 is calculated based on the calculated ΔEV(n). T(n)=0.4×2m
・・・
-(5) Here, m=ΔEV(n) Next, in step S34, as shown in FIG. Weighted voltage V(n) applied between electrodes
Calculate. V(n)=(500/7)×(T(n)+6/10
) ...(6)

In this way, the reflected light from the subject during the preliminary flash is divided into areas and photometered, the spatial distribution of the subject is detected, and the spatial distribution of the subject where the flash emitted from one flash tube is detected is measured. Since the light is distributed according to the distribution state, the optimal amount of light is irradiated to all subjects distributed in the field.

Although the above embodiment has been explained using the TTL dimming method as an example, the present invention is not limited to the TTL dimming method, but can also be applied to an external light method or a flashmatic method.

Further, the shape of the dividing pattern of the photometric area of the exposure control photometric element, the dividing pattern of the photometric area of the dimming light receiving element, and the shape and arrangement of the focus detection area are not limited to the above embodiments.

In the configuration of the above embodiment, the flash device 2
1 is a flash unit and a split irradiation type flash device, a dimming light receiving element 23 and a dimming circuit 33 are a split photometer unit, and a CPU
35 respectively constitute calculation means and control means.

[0036]

As explained in detail above, according to the present invention, the reflected light from the subject is divided into a plurality of areas and photometered at the time of preliminary flashing, and based on the photometry results, a plurality of flashes are emitted from the flash unit. The weighting amount is calculated for each area, and the flash light emitted from one light emitting part during the main flash is adjusted for each of the multiple emission areas according to the calculated weighting amount, so that the subject is irradiated with ( 1) The entire device is smaller and lighter; (2) it consumes less energy and generates less heat during continuous use; No weight or slippage occurs,
In addition to the effects of preventing uneven light distribution and (4) simplifying the control circuit by requiring only a single dimming circuit, it also provides uniform illumination for all subjects, including distant and close subjects, distributed in the field. The optimal amount of flash is emitted, and the exposure for flash photography is optimized for any part of the shooting screen. In addition, since the shape of the division pattern of the photometry area of the division photometry means and the division pattern shape of the emission area of the flash unit are almost the same, the spatial distribution state of the subject detected based on the photometry value at the time of preliminary flashing is It is possible to almost exactly match the light distribution of the flash device during the main flash, and it is possible to photograph all objects within the photographic screen with flash light at optimal exposure.

[Brief explanation of drawings]

FIG. 1: Complaint correspondence diagram.

FIG. 2 is a diagram illustrating a spatial distribution state of a subject and a corresponding light distribution control state.

FIG. 3 is a diagram illustrating a spatial distribution state of a subject and a corresponding light distribution control state.

FIG. 4 is a diagram illustrating a spatial distribution state of a subject and a corresponding light distribution control state.

FIG. 5 is a diagram illustrating a spatial distribution state of a subject and a corresponding light distribution control state.

FIG. 6 is a diagram illustrating a spatial distribution state of a subject and a corresponding light distribution control state.

FIG. 7 is a diagram showing the configuration of a TTL automatic light adjustment camera according to the present invention.

FIG. 8 is a control block diagram of a camera equipped with a flash device according to the present invention.

FIG. 9 is a diagram showing details around a dimming light-receiving element that receives light beams emitted from a flash device and reflected in a subject field.

FIG. 10 is a circuit diagram showing details of a dimming circuit.

FIG. 11 is a configuration diagram of a flash device.

FIG. 12 is a diagram showing the emission area of the light distribution control element corresponding to the irradiation area of the object field.

FIG. 13 is a diagram showing another example of the emission area of the light distribution control element.

[Figure 14] The light distribution control element is made of translucent ceramic PLZ.
A configuration diagram when configured with T.

FIG. 15 is a diagram showing the relationship between the voltage applied between the transparent electrodes of the light distribution control element and the light transmittance of the translucent ceramic PLZT.

FIG. 16 is a flowchart showing an example of a main control program.

FIG. 17 is a flowchart showing a preliminary light emission processing subroutine.

FIG. 18 is a flowchart showing a preliminary light emission processing subroutine.

FIG. 19 is a flowchart showing a weighted voltage calculation processing subroutine during main light emission.

[Explanation of symbols]

1,11 Camera 2a, 2b Angle of view of photographic lens 3-5 Light distribution characteristics 12 Photography lens 13 Mirror 14 Screen 15 Pentaprism 16 Eyepiece lens 17 Condensing lens 18 Photometering element for exposure control 18a-18e Divided photometry area 19 Aperture 20 Shutter 21 Flash device 22 Condensing lens array 23 Light receiving element for dimming 23a-23e Divided photometry area 31 Focus detection element 31a Focus detection area 32 Photometry circuit 33 Dimming circuit 34 Focus detection circuit 35 CPU 36 Light emission control circuit 37 Flash tube 38 Light distribution control circuit 39 Light distribution control element 41a-41e Amplifier 42a-42e Gain setting device 43a-43e, 45 Integral circuit 44 Adder circuit 46 Conversion circuit 47 Comparator 51 Reflective hat 52 Light distribution lens 53 Protective lens 54, 58 Polarizing lens 55a-55e Injection area 56, 57 Transparent electrode FI film

Claims (6)

[Claims] Claims 1: A light-emitting part; a light-emitting part disposed in front of the light-emitting part;
It consists of a light amount adjustment section that can adjust the amount of light emitted from a plurality of emission areas corresponding to a plurality of irradiation areas of the subject, a flash unit that performs preliminary light emission and main light emission, and a light source that is emitted by this flash unit and that is emitted by the subject. divisional photometry means for dividing and metering the luminous flux reflected in the photographic field into a plurality of areas; A calculation means for calculating the weighting amount during the main emission for each emission region, and a control means for controlling the amount of emitted light for each of the plurality of emission regions by the flashing means according to the weighting amount calculated by the calculation means. A split irradiation type flash lighting system characterized by: 2. The divided irradiation type flash illumination system according to claim 1, wherein the division pattern shape of the plurality of divided photometry areas of the division photometry means, and the division pattern shape of the plurality of emission areas of the flash unit. A split irradiation type flash lighting system characterized by having almost the same shape. 3. A light emitting unit, a light emitting unit disposed in front of the light emitting unit,
A camera that can be equipped with a split-irradiation type flash device that performs preliminary flash and main flash, and includes a light amount adjustment section that can adjust the amount of light emitted from a plurality of emission areas corresponding to a plurality of irradiation areas of a subject. a divisional photometry means for dividing and metering the luminous flux emitted by the divisional irradiation type flash device and reflected in the subject field into a plurality of areas, and said divisional photometry means at the time of preliminary flashing of said divisional irradiation type flash device. calculation means for calculating the weighting amount during the main flash for each of the plurality of emission areas of the split irradiation type flash device based on the photometry results obtained by the photometry; A camera to which a divided irradiation type flash device can be attached, characterized in that the irradiation type flash device is equipped with a control means for controlling the amount of emitted light for each of the plurality of emission areas. 4. A camera to which a divided irradiation type flash device can be attached, according to claim 3, wherein the division pattern shape of the plurality of divided photometry areas of the divided photometry means and the plurality of divided irradiation type flash devices of the divided irradiation type flash device are different from each other. A camera to which a divided irradiation type flash device can be attached, characterized in that the shape of the division pattern of the emission area is approximately the same shape. 5. A light-emitting section; disposed in front of the light-emitting section;
A split-irradiation type flash device that performs preliminary light emission and main light emission, comprising a light amount adjustment section that can adjust the amount of light emitted from a plurality of emission areas corresponding to the irradiation area of the object, the light amount adjustment section inputs the weighting amount for each of the plurality of emission areas calculated based on the photometry results of dividing the luminous flux emitted from the light emitting unit and reflected in the subject field into a plurality of areas during preliminary light emission, A divided irradiation type flash device, characterized in that the amount of light for each of the plurality of emission areas during the main emission is adjusted according to the weighting amount. 6. The divided irradiation type flash device according to claim 5, wherein the division pattern shape when the preliminary light emission is divided into a plurality of areas and photometry is performed, and the plurality of emission areas of the divided irradiation type flash device. A divided irradiation type flash device characterized in that the shape of the divided pattern is approximately the same as the shape of the divided pattern.