JPS60107026A - Automatic dimming strobe device - Google Patents

Abstract

PURPOSE:To perform simply strobe photography in a counter-light state through automatic dimming operation by providing a photometery circuit and controlling a dimming aperture value and a display aperture value with the photometery output of the circuit. CONSTITUTION:When a key input is received in dimming mode wherein rear light is not considered (2 and 12), a set aperture display system 9 and dimming aperture value setting systems (11 and 4) are set directly. When the mode of rear light photography (daylight synchronized flash photography) is selected (1 and 6), a photometery circuit 3 meters the brightness of a subject including the background, and calculates and sends a proper aperture value correspnding to a synchronized shutter speed to an aperture setting means. Said proper aperture value is sent to a display system to indicate the setting of a camera, but the value is sent to the dimming aperture value setting system after being corrected by a correcting means 10 to a value which is 1-2EV under, so that the over- exposure state of the subject is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an automatic flash control flash device capable of fully automatically controlling the amount of light emitted even in so-called backlight situations where the subject and its surroundings are bright. It is.

Conventional Structures and Problems Automatic light control flash devices have been put to practical use in various ways, and are extremely useful because they can automatically supply an appropriate amount of light to a subject under normal usage conditions.

However, the following inconvenience occurs when photographing by automatic light control operation in so-called backlighting, when the periphery of the subject is brighter than the subject outdoors during the daytime.

When using a conventional autoflash flash device to take pictures using autoflash control when backlit, the possible operating procedure is to first consider the sensitivity of the film being used and measure the light within the angle of view at the strobe synchronized shutter speed. It is conceivable to do this with a camera or the like to obtain an appropriate aperture value within that angle of view, and then try to match the aperture value for light adjustment operation of the camera and flash device to the above-mentioned appropriate aperture value.

However, in most cases, when considering backlit situations, the background of the subject is just space, meaning that even if some object exists, it is far away, so unlike when shooting indoors, the background of the subject is The amount of light that enters the light receiving element of the strobe device due to reflection from the subject side becomes considerably small.

In other words, when shooting indoors, there are various objects around the subject, so the emitted light is reflected by various objects, but when shooting backlight, the surroundings are space, but even if there are objects, Since the distance is far away, the emitted light is reflected only by the subject, and as a result, the amount of light that enters the light receiving element of the strobe when backlit is considerably smaller than when shooting indoors.

Therefore, when backlight photography is performed using the above-described imaginable operation, the subject will naturally be overexposed and appear whitish.

Looking at the above phenomenon in terms of light intensity, the inventors' actual measurement results show that when the background is a general backlit situation such as a mountain or the sea, the aperture value in the commonly used aperture range of F1.4 to F22 is Regardless of the aperture value, it is approximately 1 or 2 stops in terms of aperture value.
It has been confirmed that the image is overexposed by a few steps.

For this reason, backlight photography has conventionally not been carried out by the automatic light control operation of an automatic light control flash device, but has normally been carried out using the entire man-at-a-time flash device.

That is, first, the sensitivity of the film to be used is set, and the shutter speed of the camera is set to f1760 seconds. Next, the brightness of the subject and surroundings is measured to obtain an appropriate aperture value under the above conditions, and this is set in the camera.

Next, the distance between the subject and the camera was measured, and the manual strobe device's guide number was set to the value obtained by multiplying this distance by the previously set aperture value.

However, with the conventional procedure described above, it is difficult for inexperienced photographers to understand how to set the aperture value of the camera when using a manual strobe device, and even if the aperture value can be set, it is difficult for inexperienced photographers to understand how to set the aperture value of the camera. The method for setting the guide number depending on the distance is sometimes unknown or forgotten, which often results in shooting failures, and backlight photography using a strobe device is difficult to obtain good photos. It was recognized.

Furthermore, even if you understand the above procedure, the strobe device will not always be able to set the guide number you want to set, and in such cases, it will be cumbersome to have to change the distance to the subject, and in some cases, the desired guide number will not always be set. Conventional backlight photography procedures also have the problem of not being able to take pictures.

On the other hand, in consideration of the above-mentioned disadvantages, various devices have been proposed in recent years that allow even inexperienced photographers to perform backlight photography extremely easily, but all of these devices integrate a strobe device and a camera. In other words, it assumes a combination of a strobe device and a camera that have a special relationship, and if you do not own that special strobe device and camera, the problems with backlight photography as described above still exist. Improvements were desired.

OBJECTS OF THE INVENTION An object of the present invention is to provide an automatic flash control flash device that can perform backlight photography using automatic flash control operations, regardless of the camera to which it is combined.

Another object of the present invention is to have a photometering circuit that displays the aperture value to be set on the camera based on its photometry output, and sets a light control aperture value that is 1.5±0.5EV lower than the displayed aperture value. Therefore, it is an object of the present invention to provide an automatic light control strobe that can extremely easily perform automatic light control operation when backlit.

Still another object of the present invention is to provide a system for generating alarms when a flash aperture value is set within a range in which the flash device cannot perform automatic flash control. An object of the present invention is to provide an automatic light control flash device which is extremely advantageous in practice by being equipped with means.

Still another object of the present invention is to generate some kind of alarm when the output of the photometry circuit changes and the displayed aperture value changes in the automatic light control flash device as described above.

Structure of the Invention The automatic light control flash device according to the present invention includes a light metering circuit that measures light in a predetermined range including the subject and outputs an output signal according to the brightness, and whether or not photography is performed using automatic light control operation when backlit. a dimming aperture value that controls the operation of a dimming circuit that controls the light emitting operation of the light emitting section; a setting circuit, a display device that displays a predetermined aperture value by supplying a display aperture value signal, and a first operating system or backlight that receives the signal from the backlight detection means and performs an automatic light adjustment operation in a normal state. When the second operating system is set, the display device and the dimming aperture value setting circuit are set to the set aperture υ value from the displayed aperture value by operating the manual input means. The control means is basically configured to include a control means for controlling the operation so that the voltage is lowered by 1 to 2 EV.

In addition to the above-mentioned basic configuration, the automatic flash control flash device according to the present invention includes means for detecting fluctuations in photometric output, which is included in the above-mentioned control means, and an alarm that performs an alarm operation such as sounding based on the output of this detection means. configured with equipment.

In addition to the above-mentioned basic configuration, the automatic flash control flash device according to the present invention has a detection means included in the above-mentioned control means to detect whether the photometric output is within the range that can be set by the above-mentioned light control aperture value setting circuit. , and an alarm device that performs an alarm operation such as sounding based on the output of the detection means.

DESCRIPTION OF EMBODIMENTS FIG. 1 shows a block diagram of essential parts of an embodiment of an automatic light control flash device according to the present invention.

In the figure, reference numeral 1 indicates backlight detection means for detecting whether normal automatic light adjustment is being performed or automatic light adjustment is being performed during backlighting using, for example, a manual switch or brightness distribution on the subject side; 2;
3 is a key manually operated means for setting the light control aperture value during normal automatic light control operation and displaying the set aperture value, and 3 is a key manual means for controlling the brightness on the subject side by supplying a light metering start signal. A light metering circuit that measures light, 4 a light control aperture value setting circuit that sets a plurality of light control aperture values using a light control aperture value signal, and 5 a liquid crystal display, for example, that displays various light control aperture values using a display aperture value signal that will be described later. A display device made up of members is shown.

In addition, the area surrounded by the dashed line indicates the microcomputer (hereinafter referred to as microcomputer) that is the aforementioned control means,
6 in the microcomputer A receives a signal from the backlight detection means 1 and sets an operation mode for setting a first operation system that performs normal automatic light control operation or a second operation system that performs automatic light control operation during backlighting. The setting means is shown.

Furthermore, 7 is a photometric operation signal generating means which is selected and operated when the operation mode setting means 6 sets the second operation system, and outputs an operation signal of the photometry circuit 3 as appropriate; 8 is an output signal of the photometry circuit 3. 9 is supplied with a photometric aperture value setting means that outputs a predetermined aperture value signal that takes into account the human sensitivity strobe synchronization shutter speed. Display aperture value signal generation means for generating an optical aperture value display signal; reference numeral 10 denotes a dimming aperture value correction means for correcting the aperture value signal from the photometric aperture value setting means 8 to a signal corresponding to an aperture value lower by 1 to 2 mV; 11
Reference numeral 12 indicates a light control aperture value signal generation means for generating a light control aperture value signal for controlling the operation of the light control aperture value setting circuit 4; and 12, the operation is controlled by the operation mode setting means 6, and at least the first operation system is set. When 1. Key human power receiving means for receiving the operation of the key human power means 2 and controlling the operations of the dimming aperture value signal generating means 11 and the display aperture value signal generating means 9 are shown, respectively.

As mentioned above, the amount of correction by the flash adjustment aperture value correction means is not related to the aperture value in general backlight photography, and is approximately 1 to 2 stops in terms of the aperture value. This is based on actual measurement results that confirmed that the subject was overexposed.

Hereinafter, the operation of the automatic light control flash device according to the present invention having the above-mentioned configuration will be briefly explained. Now, suppose that the backlight detection means 1 detects normal automatic flash photography.
The operation mode setting means 6 sets the first operation system and puts the photometry operation signal generation means 7 into an inoperable state.

At the same time, the key manual input receiving means 12 is operated, and in response to the operation of the key manual input means 2, the dimming aperture value signal generating means 11 and the display aperture value signal generating means 9 are operated, respectively, and the dimming aperture value setting circuit 4, The operation of the display device 6 is controlled, and a desired light control aperture value is set and displayed.

At this time, since the photometric operation signal generating means 7 (in the first operating system) does not operate, the photometric circuit 3, photometric aperture value setting means 8, etc. do not operate.

Further, by operating the key manual means 2 described above, an appropriate light control aperture value is displayed on the display device 5, and a light control aperture value corresponding to the displayed light control aperture value is sent to the four-light aperture value setting circuit 4. It goes without saying that automatic light control flash devices such as those that can be set according to the following conditions have been put to practical use and are well known.

On the other hand, when the backlight detection means 1 detects that automatic light adjustment is being performed during backlighting, the operation mode setting means 6 sets the second operation system, puts the photometry operation signal generation means 7 into the operation state, and presses the key. The above-described operation of the human power receiving means 12 is made impossible.

Therefore, the photometry circuit 3 is operated by the output signal of the photometry operation signal generating means 7, and measures the brightness on the subject side.

The photometric output of the photometric circuit 3 is supplied to a photometric aperture setting means 8, which displays a photometric aperture signal according to the brightness of the subject. It is supplied to the value correction means 10.

Therefore, the display aperture value signal generation means 9 supplies a display aperture value signal corresponding to the photometric aperture value signal to the display device 6, and the dimming aperture value correction means 1o is 1 to 21 CV lower than the photometric aperture value signal. A corrected light adjustment aperture value signal is output and supplied to the light adjustment aperture value signal generation means 11.

Therefore, the display device 6 does not display the aperture value corresponding to the photometric aperture value set by the photometric aperture value setting means 8, and at the same time, the photometric aperture value setting circuit 4 This means setting a light control aperture value that is ~2EV lower.

In other words, when the operation mode setting means 6 selects the second operation system, which is an automatic light control operation during backlighting, the first operation system is displayed on the display device 6, unlike when the first operation system is set. This means that the light control aperture value set by the light control aperture value setting circuit 4 is different from the light control aperture value set by the light control aperture value setting circuit 4.

To explain in terms of specific correspondence, if the display aperture value of the display device 5 is 28, the light control aperture value setting circuit 4 will set the light control aperture value to 26.6, which is 1 Ev lower, for example. That's why the strobe device works. Note that the key human power reception means 12 is put into an inactive state when the operation mode setting means 6 selects the second operation system, but for example, the signal as shown by the broken line X is supplied only when the second operation system is selected. If it were possible to do this, if the key manual means 2 is operated during the second operation system, the displayed aperture value etc. cannot be controlled.
It can be used to control the operation of the photometric operation signal generating means, and in reality, it is preferable that the photometric operation by the photometric circuit 3 can be performed not only at appropriate intervals but also at any time.
It goes without saying that the development as described above will have extremely practical value.

Further, regarding the operation mode setting means 6, as shown by the broken line Y, for example, when setting the second operation system, the second
Needless to say, it is possible to include a control system that displays figures, characters, etc. on the display device 5 indicating that the operating system has been set. It is also clear that it can be made into

FIG. 2 is a schematic electrical circuit diagram illustrating an embodiment of an automatic light control flash device according to the present invention, which corresponds to the block diagram shown in FIG. 1.

Components with the same numbers as those in Figure 1 have the same functional configuration; 13 is a power supply, 14 is a power switch, 15 is a light emitting section consisting of a well-known DC-DC converter circuit, a main capacitor, a flash discharge tube, etc., and 16 is a light emitting unit. a dimming circuit for controlling the light emitting operation of the section 3;
7 is a voltage generation circuit that generates a predetermined voltage simultaneously with the light emission operation of the light emitting unit 15; 18 is a light control sensor that receives reflected light from the subject side due to the light emission of the light emitting unit 15; 19 is a light control integrating capacitor; 20 indicate the discharge resistors, respectively.

21 is a comparator whose non-inverting input terminal is supplied with the terminal voltage of the integrating capacitor 7 for dimming, 22 to 26 are resistors that control the operating level of the comparator 21 and set the dimming aperture value, and 27 to 30 are resistors. 22 and the resistors 23 to 26, and transistors that are switch elements that control the above-mentioned dimming aperture value are shown.
The first one forms a light control aperture value setting circuit 4.

The photometric circuit 3 also includes a photometric sensor 31 that receives ambient light from the subject side, a transistor 33 that is a switching element that controls the connection state between this sensor 31 and a photometric integrating capacitor 32, and a terminal voltage of the capacitor 32. A Sarel comparator 34 is supplied to the non-inverting input terminal, and resistors 35 and 36 set the operating level of this comparator 34.
It consists of Reference numeral 37 indicates an interlocking switch that operates in conjunction with the power switch 14, 38 indicates a reference power source, and 39 indicates an OFF state when performing normal automatic light control operation, and an ON state when performing automatic light control operation when backlit. A changeover switch, which is backlight detection means 1, is shown. 4o is the output terminal of the photometry operation signal generating means 7 of the microcomputer; 41 to 4;
Similarly, 4 is an output terminal of the dimming aperture value signal generating means 11;
6 designates the output terminals of the display aperture value signal generating means 9;
Reference numeral 46 indicates a shift switch which is the key manual means 2.

The operation of the automatic light control flash device as shown in FIG. 2 will be described below, but first the relationship between the microcomputer and the photometry circuit 3 will be described.

The microcomputer in this embodiment has an output terminal 4o of its photometric operation signal generating means 7, and an operation mode setting means 6
When the second operating system is set, that is, when the selector switch 39, which is the backlight detection means 1, is off, it is kept at a high level (hereinafter referred to as H), and the selector switch 39 is turned on to set the second operating system. When this happens, it operates to maintain the level at a low level (hereinafter referred to as "hereinafter") for a predetermined period at appropriate intervals.

Therefore, in the photometry circuit 3, when the output terminal 4o is H, the transistor 33 becomes conductive, and the photometry integrating capacitor 3
It cannot operate because both ends of the terminal 2 are short-circuited, and therefore it operates only when the output terminal 4o is at L. By the way, there is no need to describe the operation of the photometry circuit 3 in detail when the output terminal 40 is L, but the charging voltage of the capacitor 32 is charged according to the brightness of the subject by the photocurrent flowing through the photometry sensor 31. However, when the voltage exceeds the reference level set by the division ratio of the resistor 35.36 and the reference power supply 38, the comparator 34 operates and inverts its output terminal. On the other hand, the output signal of the comparator 34 is supplied to the microcomputer, and the microcomputer sets the photometric aperture value according to the brightness of the subject, taking into account the film sensitivity, etc. For example, this setting is made at output terminal 4.
Needless to say, it can be obtained from the time signal from the time when o becomes L to the time when the inversion operation of the output signal of the comparator 34 is obtained. It is supplied to the aperture value setting means 8 as shown by the broken line 2, and the photometric aperture value is set based on the time it takes for the charging voltage of the photometric integrating capacitor 32 to reach a predetermined level.

Now, if the selector switch 39 is turned off in the circuit as shown in FIG. photometric operation signal generating means 7;
The photometry circuit 3 and the like become inactive.

When the power switch 14 is turned on in such a state, the light emitting section 1
6 starts the operation, and a main capacitor (not shown) etc. performs a light emission preparation operation.

Since the switch 37 is also turned on at the same time, the microcomputer operator operates according to the first operation system described above, and by operating the shift switch 46, which is the key human power means 2, The display aperture value signal generating means 9 operates, and a desired light control aperture value is set and displayed.

In addition, regarding the specific setting operation of the desired light control aperture value in FIG. outputs an H signal to the terminals of , sequentially turns on the transistors 27 to 30 of the dimming aperture setting circuit 4, controls the connection between the resistor 22 and the resistors 23 to 26, and sets the operating level of the comparator 21 as appropriate. In reality, the set dimming aperture value and the output signals of the output terminals 41 to 44 of the microcomputer are set in a relationship as shown in Table 1, for example.

Table 1: In other words, if you want to set the dimming aperture value to 26.6, you only need to operate the shift switch 46 so that the H signal is output from the microcontroller output terminal 43, and therefore the display device 5
All you have to do is operate the shift switch 46 until the displayed aperture value becomes F6.6.

When the light emitting unit 16 operates and emits light with the desired light control aperture value set as described above, the reflected light from the subject is received by the light control sensor 18, and the light control integral is calculated according to the amount of light received. The charging voltage of the capacitor 19 is compared with the voltage level corresponding to the desired dimming aperture υ value by the comparator 21, and when the charging voltage of the capacitor 19 exceeds the voltage level, the comparator 21 is activated and the dimming circuit 16 is activated. , the light emitting section 15 is forced to stop operating. Therefore, by setting the aperture value displayed on the display device on the camera, the photographer can perform an automatic light adjustment operation corresponding to the aperture value.

The operation as described above is a light emission operation by a normal automatic light control operation performed by setting a desired light control aperture value.

Next, a case will be described in which light is emitted by automatic light control operation when backlit.

In this case, the changeover switch 39, which is the backlight detection means 1, is turned on.

Therefore, as mentioned above, the microcomputer-based operation mode selection means 6 sets the second operation system, and the photometry operation signal generation means γ starts operation.

Therefore, the microcomputer-based output terminal 4 oil becomes L, and the photometric circuit 3 operates as described above, and by receiving the generation point of the output signal of the photometric circuit 3, the microcomputer-based photometric aperture value setting means 8 performs photometry. Set the aperture value.

Hereinafter, as described in the explanation of FIG.
0 to the light control aperture value signal generating means 11, and the display light control aperture value and the set light control aperture value are operated to be different.

Here, an example of the above-mentioned photometric aperture value, display aperture value, dimming aperture value, and output states of the microcomputer-based output terminals 41 to 44 is as shown in Table 2.

In Table 2 above, the photometric aperture value and the display aperture value, that is, the aperture value that should be set on the camera, are set to be the same, but the inventors' actual measurement and photographic results show that only the background with no subject is photographed. The difference between the photometric aperture value when the subject is included and the photometric aperture value when the subject is included is only about 0.6 stops lower when the subject is included, and the above display aperture value is set on the camera. It has been confirmed that even when shooting, the background is only about 0.6 steps over, which is enough to cover the background with the latitude of the film.

In addition, the first effect of strobe light emission is mostly when backlit,
If the background is far away, it doesn't matter at all.

That is, it has been confirmed that even if the strobe device is made to emit light under the above conditions, the result of approximately 0.5 stops overshoot does not change.

Now, when the appropriate display aperture value and dimming aperture value are set by the operation of the microcomputer as described above, for example, the display device displays F8, and from Table 2, the dimming aperture value is set to F5.6. When the camera's aperture value is set to F8, which is the display aperture value, and the light emitting unit 15 is operated in this state, the background will be in a sufficiently appropriate exposure state depending on the latitude of the film as described above. The subject is controlled by the light control aperture value of F5.6.

However, the amount of light actually supplied to the subject is delayed because the flash device's light control circuit operates at a later time than during normal shooting because the amount of light reflected on the light control sensor is smaller than during normal shooting. 1-2 steps, F6.
6 does not mean F8 to F11, and as a result, it corresponds to the previously displayed aperture value of F8.

Therefore, as a photograph, appropriate exposure conditions can be obtained for both the background and the subject.

The operation described above is the automatic flash control operation in backlit situations, and there is no need to explain it in detail, but the photographer can easily set the camera's aperture to the aperture value displayed on the display device. This allows photography to be performed using light control operations.

In the embodiment shown in FIG. 2, the number of light control aperture values to be selected is four, but it is of course easy to increase the number as appropriate, and a manual changeover switch is used as the backlight detection means 1. However, it is also possible to use electrical means that can, for example, perform partial photometry within the field of view, electrically judge the brightness distribution as appropriate, and output an output signal depending on whether or not it is backlit. Not even.

Furthermore, if the value of the photometric aperture value determined by photometry differs from the previous value due to, for example, movement of the camera or fluctuations in daytime light, or if the light control aperture value cannot be set using the light control aperture value setting circuit. In other words, as explained in Table 2, if the photometric aperture value that was previously F5.6 becomes F8, or if it becomes a value that corresponds to F4 or less or 211 or more, ・Actually, it will not be possible to take a picture as it is. Since this is impossible, an extremely practical automatic light control flash device can be obtained by considering the possibility of activating a warning device such as a sound.

FIG. 3 is a block diagram of main parts showing another embodiment of the automatic light control flash device according to the present invention, which takes into consideration an alarm device when the above-mentioned photometric result is different from the previous one.

As is clear from FIG. 3, in this embodiment, compared to the embodiment shown in FIG. means 49 and alarm signal generating means 60.

The alarm device 47 is constituted by a device that performs, for example, a sounding operation by receiving the alarm signal output from the alarm signal generating means 60.

The photometric aperture value storage means 48 is supplied with the photometric aperture value signal outputted by the photometric aperture value setting means 8 through the photometric operation of the photometric circuit 3, and stores the photometric aperture value signal and stores the previous photometric operation. The previously stored photometric aperture value signal is output to the comparing means 49.

The comparison means 49 is supplied with the photometric aperture value signal output by the photometric aperture value setting means 8 through the operation of the photometry circuit 3 and the previous photometric aperture value signal due to the operation of the photometric aperture value storage means 48 described above, and compares both these signals. Compare.

If the comparison results are the same, the photometric aperture value signal from the current photometry operation is supplied as is to the display aperture value signal generation means 9 and the dimming aperture value correction means 10, and if there is a difference, the above operation is performed. In addition to this, an alarm start signal for operating the alarm signal generating means 50 is output.

The alarm signal generating means 50 enters the operating state by being supplied with the alarm start signal outputted by the operation of the above-mentioned comparison means 49, supplies the alarm device 47 with an alarm signal that causes the alarm device 47 to operate, and at the same time, for example, The display aperture control signal is used to perform operations such as alternately blinking the display aperture value corresponding to the display aperture value displayed by the previous display device and the display aperture value corresponding to the new photometric aperture value obtained by this photometry. This signal is supplied to the value signal generating means 9.

Since the embodiment shown in FIG. 3 is equipped with the above-mentioned means and devices, it is possible to use the camera when taking pictures using automatic flash control in backlight conditions by the operation described in conjunction with FIG. 1. If the backlight conditions change due to movement or the like, the fluctuation is first changed and then the photometric circuit 3 operates, and the above fluctuation is converted into a change in the output of the photometric aperture value setting means 8 by the photometric aperture value storage means 48 and comparison means 49. At the same time, a photometric aperture value signal that is different from the previous one is supplied to the photometric aperture value correction means 10, so that the setting change of the photometric aperture value is canceled.

By the above detection operation, that is, the comparison operation between the previous photometric aperture value and the current changed photometric aperture value, the comparison means 49 then outputs an alarm start signal, and this start signal is supplied to the alarm signal generation means 60. It turns out.

As mentioned above, the alarm signal generating means 6o operates the alarm device 47 and also controls the display aperture value signal generating means 9 when supplied with the alarm start signal.

Therefore, the automatic light control strobe device shown in FIG. At the same time, the previously displayed aperture value and the currently changed aperture value are flashed.

At this time, the light control aperture value setting circuit 4 transfers the changed light control aperture value signal to the light control aperture value correction means 10 via the comparing means 49.
It goes without saying that the light control aperture value corresponding to the aperture value that is 1 to 2 EV lower than the aperture value that should be set in the camera is set by the current photometry.

As a result, the photographer can extremely easily recognize changes in backlight conditions, and can simply reset the aperture value of the camera using the aperture value displayed on the display device 6, without having to perform any complicated operations. You will be able to deal with this.

Similarly, the display operation of the display device 6 at the time of an alarm, for example, the blinking operation of the previous display and the display that needs to be newly set, is to make it easier for the photographer to confirm the aperture υ value set. Possible developments include having different lighting times.

Regarding how long the alarm operation will continue, if the alarm continues until the next photometry operation is performed by the operation of the photometry operation signal generating means 7, it may be considered an excessive alarm.

Therefore, when such an alarm means is provided, the configuration as explained by the broken line X in FIG. When the operating system is set, the key manual input means 2 is operated to operate the photometry operation signal generating means 7, and the photometry circuit 3 is immediately activated.
Similarly, the broken line X in FIG.
If the key manual means 2 is operated in response to the alarm operation, the next photometry operation will be performed immediately, and if the backlight condition remains fluctuated, the previous comparison means will be installed as shown in . The alarm operation is immediately stopped by the operation of 49, and the changed display aperture value and dimming aperture value are also set, which is extremely practical.

On the other hand, regarding the alarm when the photometry result by the photometry circuit 3 is within a range in which the dimming aperture value cannot be set, in this case, the method of inputting the comparison means 49 shown by the number 48 in FIG. Instead of the photometric aperture value storage means 48 that forms the signal, the effective range storage means 61, which stores the range of light control aperture values that can be set in advance, is provided independently, that is, the signal is supplied from the photometry aperture value signal setting means 8. 3, and the comparison means 49 compares the output of the photometric aperture value signal setting means 8 with the effective range storage means 5.
1, and if the output is outside the effective range, an alarm start signal for operating the alarm signal generation means 5o and a display aperture value control signal for controlling the operation of the display aperture value signal generation means 9 are sent. All you have to do is configure it so that it can be output.

That is, with the above configuration, the output of the photometric aperture value signal setting means 8 is transferred to the effective range storage means 5 by the comparison means 49.
1, and if the result is outside the range, the alarm signal generating means 60 is operated, and the alarm device 47 issues an alarm such as a sound, as in the case of the variation of the backlight condition described above.

At the same time, when the above-mentioned alarm is activated, displaying an aperture value outside the range does not mean that no photograph can be taken, so the display on the display device 5 is turned off, for example, by the display aperture value control signal from the comparing means 49. display aperture value signal generation means 9
The photographer can easily recognize that the photometry result is within the range in which the light control aperture value cannot be set. Regarding the alarm activation period, as in the case described above, a very practical period can be set by using the key manual means 2.

It goes without saying that the above-mentioned warning means for changing the backlight condition and the warning means for when the object is out of the effective range may be provided together.

Effects of the Invention The automatic light control strobe device according to the present invention includes a photometry circuit,
Since the light control aperture value and display aperture value are controlled by the light metering direction of this photometry circuit, it has the effect of making it possible to perform flash photography in backlit situations, which was previously considered troublesome, extremely easily by automatic light control operation. .

Further, by providing a means for detecting and warning a fluctuation in the output of the photometry circuit or a state in which the light control aperture value cannot be set, the above-mentioned effects can be obtained extremely effectively in practice.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a main part of an embodiment of an automatic light control strobe device according to the present invention, and FIG. 2 is a block diagram of an embodiment of an automatic light control flash device according to the invention corresponding to the block diagram shown in FIG. FIG. 3 shows a schematic electrical circuit diagram and a block diagram of main parts of another embodiment of an automatic light control flash device according to the present invention. 1... Backlight detection means, 2... Key manual means, 3... Photometering circuit, 4... Light control aperture value setting circuit, 6... ...Display device, 6...
Operation mode setting means, 7...Photometry operation signal generation means, 8...Photometry aperture value setting means, 9...
Display aperture value signal generation means, 10... Light control aperture value correction means, 11... Light control aperture value signal generation means, 12... Key manual reception means, 47...
...Alarm means, 48...Photometric aperture value storage means,
49... Comparison means, 50... Alarm signal generation means, 61... Valid range storage means.

Claims (7)

[Claims] (1) A dimming aperture value setting circuit that automatically selects a plurality of dimming aperture values by a key human power receiving means that converts the operation of an externally operated key human power means into an electrical signal, and An automatic light control flash device equipped with a display device that displays the selected one has a light metering circuit that measures the brightness of a predetermined range including the subject and outputs a light metering output according to the brightness, and an automatic light control circuit that measures the brightness of a predetermined range including the subject and outputs a light metering output according to the brightness. A backlight detection means for detecting whether or not a light operation is to be performed, and a first . an operation mode setting means for setting a second operation system; a photometry start time setting timer means for setting an operation start time of the photometry circuit when setting the second operation system corresponding to the backlight; and photometry of the photometry circuit. A photometric aperture value setting means that takes into consideration the sensitivity of the film used and outputs all photometric aperture value signals when the output is supplied; display aperture value signal generation means for outputting a display aperture value signal for controlling the display aperture value signal;
a dimming aperture value correction means for fully setting a first dimming aperture value signal corresponding to a lower aperture value by ~2KV; and a second light control aperture value signal generating means for setting a light control aperture value according to the first light control aperture value signal. (2) The operation mode setting means controls the operation of the key human power receiving means, and when setting the second operation system, sends a start signal to start the photometry start point setting timer means by operating the key human power means. The automatic flash control device according to claim 1, wherein the automatic light control flash device is outputted to the key manual input receiving means. (3) When setting the second operation system, the operation mode setting means outputs an operation mode display signal that causes the display device to display figures, characters, etc. indicating the operation system at the time of backlighting. ) Automatic light control strobe device described in section 2. (4) A light control aperture value selection circuit that automatically selects a plurality of light control aperture values by a key human power receiving means that converts the operation of an externally operated key human power means into an electrical signal, and selection of the light control aperture value. An automatic light control flash device equipped with a display device that displays one of the brightness levels includes a light metering circuit that measures the brightness of a predetermined range including the subject and outputs a light metering output according to the brightness, and an automatic light control when backlit. A backlight detection means for detecting whether or not an operation is to be performed, and a first . an operation mode setting means for setting a second operation system; a photometry start point setting timer means that operates when setting the second operation system corresponding to the backlight and sets an operation start point of the photometry circuit; and the photometering circuit a photometric aperture value setting means for setting and outputting a photometric aperture value signal by taking into account all the sensitivity of the film used, etc. by being supplied with the photometric output of the photometric aperture value; a photometric aperture value storage means for outputting a signal; a comparing means for receiving the photometric aperture value signal and the previous photometric aperture value signal, comparing the two signals and outputting an alarm start signal when there is a difference; display aperture value signal generation means for supplying the photometric aperture value signal to the display device and supplying the display aperture value signal corresponding to the photometric aperture value signal to the display device; A first aperture value corresponding to an aperture value that is 1 to 2 EV lower than the displayed aperture value corresponding to the photometric aperture value signal is supplied.
a light control aperture value correction means for outputting a light control aperture value signal; a light control aperture value signal generating means for outputting a second light control aperture value signal for setting a light aperture value; an alarm signal for operating an alarm device to which the alarm start signal is supplied and performs a sounding operation, etc.; and the display. An automatic light control flash device comprising: a display aperture value control signal for controlling the operation of an aperture value signal generation means; and an alarm signal generation means for outputting an aperture value control signal. (5) The operation mode setting means controls the operation of the key human input receiving means, and when setting the second operation system, sends a start signal for starting the photometry start point setting timer means by operating the key human power means. The automatic flash control device according to claim 4, wherein the automatic light control flash device is outputted to the key manual input receiving means. (6) When the second operation system is set, the operation mode setting means outputs an operation mode display signal that causes the display device to display a figure, text, etc. indicating the operation system at the time of backlighting. ) The automatic light control strobe device described in section 2.). (7) A dimming aperture value selection circuit that automatically selects a plurality of dimming aperture values by a key human power receiving means that converts the operation of an externally operated key human power means into an electrical signal, and selection of the dimming aperture value. An automatic light control flash device equipped with a display device that displays one of the brightness levels includes a light metering circuit that measures the brightness of a predetermined range including the subject and outputs a light metering output according to the brightness, and an automatic light control when backlit. A backlight detection means for detecting whether or not an operation is to be performed, and a first . an operation mode setting means for setting a second operation system; and a photometry start point setting timer means that operates when setting the second operation system corresponding to the backlight and sets the operation start point of the photometry circuit;
A photometric aperture value setting means for setting and outputting a photometric aperture value signal in consideration of the sensitivity of the film used, etc. by being supplied with the photometric output of the photometric circuit, and storing an effective range that can correspond to the preset photometric aperture value. and comparing means for comparing both the photometric aperture value signal and the signal from the effective range storage means and outputting an alarm start signal when the photometric aperture value signal is outside the effective range. and,
A display aperture value signal generating means to which the photometric aperture value signal is supplied via the comparison means and a display aperture value signal corresponding to the photometric aperture value signal to the display device; a dimming aperture value correction means that is supplied with a photometric aperture value signal and outputs a first dimming aperture value signal corresponding to an aperture value that is 1 to 2 KV lower than the displayed aperture value corresponding to the photometric aperture value signal; a light control aperture value signal for receiving the light control aperture value signal and outputting a second light control aperture value signal for causing the light control aperture value setting circuit to set a light control aperture value according to the first light control aperture value signal. Outputs an optical aperture value signal generation means, an alarm signal that operates an alarm device that is supplied with the alarm start signal and performs a sounding operation, etc., and a display aperture value control signal that controls the operation of the display aperture value signal generation means. An automatic light control strobe device comprising an alarm signal generating means.