JPH07128703A - Stroboscope controller - Google Patents

Abstract

PURPOSE:To judge the propriety of light emission in accordance with a 1st specified EV value in the case film sensitivity is equal to or above a 1st specified value; a specified BV value in the case the film sensitivity is equal to or above a 2nd specified value and under the 1st specified value; and a 2nd specified EV value in the case the film sensitivity is under the 2nd specified value. CONSTITUTION:In a strobe light emission propriety judging part 4, the BV value from a photometry part 1, and the EV value and an SV value from a film sensitivity detection part 2 and an exposure calculation part 3 are inputted; and also 1st specified exposure from a 1st specified exposure setting part 5, 2nd specified exposure from a 2nd specified exposure setting part 6, specified subject brightness from a specified subject brightness setting part 7, the 1st specified film sensitivity from a 1st specified film sensitivity setting part 8, and the 2nd specified film sensitivity from a 2nd specified film sensitivity setting part 9 are inputted, respectively. The judging part 4 judges the propriety of the permission of the strobe light emission in accordance with the SV value, the EV value and the BV value.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a strobe control device for a camera, which switches whether or not strobe light is emitted depending on the result of photometry of a subject.

[0002]

2. Description of the Related Art Generally, a strobe control device for a camera is
Depending on the result of photometry of the subject, whether or not the strobe emits light is switched and used. For example, subject brightness BV value and I
When the exposure time calculated by the exposure amount EV calculated from the SO value is slower than the camera shake time calculated from the focal length of the photographing lens, the strobe light is emitted.

Further, in Japanese Patent Laid-Open No. 63-229442, when the film sensitivity is higher than a predetermined value, strobe emission is permitted on condition that the BV value (subject brightness) is lower than the predetermined value, and the film sensitivity is When the value is less than the predetermined value, the EV value (exposure amount) is allowed to be emitted under the condition that the EV value is not more than the predetermined value. A strobe control device is disclosed.

[0004]

However, the BV value, which determines whether or not the strobe emits light, becomes lower as the film sensitivity becomes higher. Therefore, in the case of the strobe control device based on the hand-shake time described above, when a high ISO film is used, the photograph does not emit light even under artificial light that the strobe emits, and the photograph has poor color balance.

Further, the strobe control device disclosed in Japanese Patent Laid-Open No. 63-229442 has the following problems. That is, the EV value that determines whether or not stroboscopic light emission is possible increases as the film sensitivity increases when the film sensitivity is equal to or higher than a predetermined film sensitivity. Therefore, when a high ISO film is used, the stroboscope emits light with a small aperture, and there is a problem that energy is wasted.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a strobe control device capable of preventing a photograph having a poor color balance from being produced and preventing energy from being wasted.

[0007]

That is, according to the present invention, a photometric means for measuring subject brightness, a film sensitivity detecting means for detecting film sensitivity, and an appropriate exposure amount are calculated based on the subject brightness and the film sensitivity. An exposure amount calculation means and a light emission possibility determination means for determining whether or not the strobe means can emit light based on the subject brightness, the film sensitivity, and the proper exposure amount are provided, and the light emission possibility determination means is
When the film sensitivity is higher than the first predetermined sensitivity, the strobe means is allowed to emit light on condition that the proper exposure amount calculated by the exposure amount calculating means is smaller than the first predetermined exposure amount. , The film sensitivity is the first
If the subject brightness measured by the photometric means is lower than a predetermined brightness, the light is emitted when the second predetermined sensitivity, which is lower than the predetermined sensitivity, and the first predetermined sensitivity. If the film sensitivity is lower than the second predetermined sensitivity, the strobe means is allowed to emit light on condition that the proper exposure amount is smaller than the second predetermined exposure amount. .

The present invention further comprises a photometric means for measuring the subject brightness, a film sensitivity detecting means for detecting the film sensitivity, and an exposure amount calculating means for calculating an appropriate exposure amount based on the subject brightness and the film sensitivity. The light emission propriety determination means for determining whether or not the strobe light is capable of emitting light based on the subject brightness, the film sensitivity, and the appropriate exposure amount, and the light emission propriety determination means is calculated by the exposure amount calculation means. The first light emission condition when the proper exposure amount is smaller than the first predetermined exposure amount and the subject brightness measured by the photometric means is lower than the predetermined brightness, and the proper exposure amount is the first predetermined value. If at least one of the second light emission condition and the second light emission condition that is smaller than the second predetermined exposure amount, which is set to a value smaller than the exposure amount, is satisfied, And permits the emission.

[0009]

In the strobe control device of the present invention, the subject brightness is measured by the photometric means and the film sensitivity is detected by the film sensitivity detecting means. Further, the appropriate exposure amount is calculated by the exposure amount calculation means based on the subject brightness and the film sensitivity. When the film sensitivity is higher than the first predetermined sensitivity, the light emission propriety determination means determines that the proper exposure amount calculated by the exposure amount calculation means is smaller than the first predetermined exposure amount. The strobe means is allowed to emit light. Further, the film sensitivity is lower than the first predetermined sensitivity and the second predetermined sensitivity is lower than the first predetermined sensitivity.
If the subject brightness measured by the photometric means is lower than the predetermined brightness, the strobe means is allowed to emit light. Further, when the film sensitivity is lower than the second predetermined sensitivity, the light emission permission / inhibition determination unit allows the flash unit to emit light on condition that the appropriate exposure amount is smaller than the second predetermined exposure amount. .

In the strobe control device of the present invention, the subject brightness is measured by the photometric means, the film sensitivity is detected by the film sensitivity detecting means, and the proper exposure is performed based on the subject brightness and the film sensitivity. The amount is calculated by the exposure amount calculation means. Then, in the light emission possibility determining means, the proper exposure amount calculated by the exposure amount calculating means is smaller than the first predetermined exposure amount, and the subject brightness measured by the photometric means is lower than the predetermined brightness. At least one of the first light emission condition and the second light emission condition when the appropriate exposure amount is smaller than the second predetermined exposure amount set with a value smaller than the first predetermined exposure amount. If satisfied, the strobe means is allowed to fire.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an embodiment of the present invention and is a block diagram showing an outline of a strobe control device. In the figure, the outputs of the photometry unit 1 and the film sensitivity detection unit 2 are supplied to the exposure amount calculation unit 3 and the exposure amount calculation unit 3
Is output to the strobe light emission permission / inhibition determination unit 4.
The strobe emission availability determination unit 4 is supplied with respective set values from the first predetermined exposure amount setting unit 5, the second predetermined exposure amount setting unit 6 and the predetermined subject brightness setting unit 7. Furthermore, the strobe light emission permission / inhibition determination unit 4 includes a first predetermined film sensitivity setting unit 8 and a second predetermined film sensitivity setting unit 9,
Each predetermined film speed value is provided. Then, the strobe light emission permission / inhibition determination unit 4 outputs a strobe light emission permission signal and a strobe light emission prohibition signal.

In such a configuration, from the photometric unit 1, the subject brightness is measured and the brightness data (hereinafter referred to as BV value) corresponding to the subject brightness is stored in the exposure amount calculation unit 3 and the stroboscopic light emission judgment unit 4. Is output to each. On the other hand, the film sensitivity detection unit 2 detects the sensitivity of the film loaded in the camera, and the film sensitivity data (hereinafter, referred to as SV value) corresponding to the film sensitivity is detected by the exposure amount calculation unit 3 and the strobe emission availability. Each is output to the determination unit 4.

The exposure amount calculation unit 3 receives the BV value measured by the photometry unit 1 and the SV value detected by the film sensitivity detection unit 2 as inputs, and outputs an appropriate exposure amount (hereinafter, EV).
Value) is calculated. The calculated EV value is output to the strobe emission availability determination unit 4.

Then, the stroboscopic light emission possibility determining unit 4
The BV value, EV value, and SV value are input and the first
Predetermined exposure amount setting unit 5 to first predetermined exposure amount, second predetermined exposure amount setting unit 6 to second predetermined exposure amount, predetermined subject brightness setting unit 7 to predetermined subject brightness, first predetermined film sensitivity setting The first predetermined film speed and the second predetermined film speed setting unit 9 input the second predetermined film speed and the second predetermined film speed, respectively.

Here, the stroboscopic light emission permission / inhibition determination unit 4 determines S
When the V value is equal to or higher than the first predetermined film sensitivity, the flash emission is permitted on condition that the EV value is equal to or lower than the first predetermined exposure amount. If the SV value is lower than the first predetermined film sensitivity, and if the BV value is equal to or lower than the predetermined subject brightness when the second predetermined film sensitivity is higher than the predetermined film sensitivity, strobe light emission is permitted. Further, if the SV value is less than the second predetermined film sensitivity, strobe light emission is permitted on condition that the BV value is equal to or less than the second predetermined exposure amount. Then, under the conditions other than the above, the stroboscopic light emission possibility determination unit 4 prohibits the stroboscopic light emission.

FIG. 2 shows a second embodiment and is a block diagram showing the configuration of a camera system to which the strobe control device of the present invention is applied. In FIG. 2, CPU1
0 is composed of a microcomputer for controlling the sequence of the entire camera. A strobe control circuit 12 including a light emission control circuit (not shown) for the strobe light emitting tube 11 and a charge control circuit for storing a light emission charge in a main capacitor is connected to the CPU 10. Also,
The CPU 10 measures the subject brightness by detecting a photocurrent corresponding to the subject brightness flowing through the photodiode 13, and supplies the brightness data to the CPU 10.
Are connected.

A focal length variable magnification variable magnification motor drive circuit 16 for driving and controlling the motor 15 is for moving the variable magnification lens 17 according to an instruction from the CPU 10 to change the focal length. Further, the comb teeth 18 are rotated in association with the movement of the variable power lens 17, and the photointerplater 19
The rotation amount is converted into an electric pulse. The PI (photo interrupter) control circuit 20 controls the photo-interplater 19 and at the same time performs waveform shaping of the electric pulse output from the photo-interplater 18 to generate CP.
Output to U10. In the CPU 10, the relative movement amount of the variable power lens 17 is obtained from the number of input pulses, and the focal length is calculated.

Further, the CPU 10 is composed of a shutter unit 21 as a program AE shutter in which an aperture and a shutter speed are interlocked with each other, and three switches, which come into contact with a pattern provided on the outer periphery of the film case, and the pattern A switch 22 that determines the film sensitivity from the conductive / non-conductive arrangement is connected.

The shutter unit 21 will be briefly described with reference to FIG. FIG. 3 is a mechanical diagram of the shutter unit 21. In this figure, when the AE gear 211 is rotated by the rotation of a motor (not shown), the MG arm 213 is charged through the opening / closing lever 212 and attracted to the AE magnet 214. Furthermore, AE gear 2
When 11 rotates, the opening / closing lever 212 rotates clockwise and the sector 215 opens. When the proper exposure value is reached, the AE magnet 214 is turned off and the sector 215
Closes and the series of exposure operations ends.

FIG. 4 is a diagram showing the stroboscopic light emission area of the camera controlled in the present embodiment on a diagram showing the relationship among the BV value, the SV value and the EV value. In addition, in FIG.
In the embodiment, the first predetermined exposure amount is 12.25, the second predetermined exposure amount is 9.25, and the predetermined subject brightness is 4.25.
25, ISO800 (S
8) at V value, ISO1 as the second predetermined film sensitivity
It is indicated by a specific numerical value such as 00 (5 in SV value).

That is, when the film sensitivity is ISO 800 or more (SV value ≧ 8), the strobe emits light under the condition of EV value ≦ 12.25. And the film sensitivity is ISO1
In the case of 00 or more and less than ISO800 (5 ≦ SV value <8), the strobe emits light under the condition of BV value ≦ 4.25. Further, it is shown that when the film sensitivity is less than ISO100, the strobe emits light under the condition of EV value ≦ 9.25.

Next, referring to the flowchart of FIG.
The processing operation of the second embodiment will be described. The subroutine "strobe light emission discrimination processing" is used to determine whether or not strobe light emission is possible.
Will be realized in.

First, in step S1, the subject brightness is measured and the BV value is calculated. Then, in step S2, the film sensitivity is detected and the SV value is calculated. Next, in step S3, EV = BV + S is calculated from the BV value and the SV value.
The appropriate exposure amount EV value is calculated by the calculation formula of V.

Then, in step S4, it is determined whether the obtained SV value is 8 or more. Here, if SV ≧ 8, the process proceeds to step S5 and SV <
If it is 8, the process branches to step S6.

In step S5, it is determined whether the EV value is 12.25. And EV ≦ 12.2
The case of 5 is the case of SV ≧ 8 and EV ≦ 12.25. Since this is within the stroboscopic light emission region shown by the shaded portion in FIG. 4, the process proceeds to step S9, and the stroboscopic light emission is permitted. On the other hand, in step S5,
When EV> 12.25, SV ≧ 8 and EV> 1
This is the case of 2.25. Since this is outside the stroboscopic light emission area shown in FIG. 4, the process proceeds to step S10, and stroboscopic light emission is prohibited.

On the other hand, in step S6, the SV value is 5
It is determined whether or not the above. Where SV ≧
If it is 5, the process branches to step S7, and if SV <5, the process branches to step S8.

In step S7, the BV value is 4.25.
A determination is made as to whether it is: BV ≦ 4.25
Is the case of 5 ≦ SV <8 and BV ≦ 4.25. This is within the stroboscopic light emission area shown by the hatched portion in FIG. 4, and the process proceeds to step S9 to permit the stroboscopic light emission. Further, in step S7, BV> 4.
25, 5 ≦ SV <8 and BV> 4.25
Is the case. This is outside the strobe light emitting area shown in FIG. Therefore, the process proceeds to step S10, and strobe light emission is prohibited.

Further, in step S8, the EV value is 9.2.
A determination is made as to whether it is 5 or less. Where EV
If ≦ 9.25, SV <5 and EV ≦ 9.25
Is the case. Since this is within the stroboscopic light emission region shown by the shaded portion in FIG. 4, the process proceeds to step S9, and the stroboscopic light emission is permitted. On the other hand, if EV> 9.25, SV <5 and EV> 9.25, which is outside the flash emission region shown in FIG.
The procedure advances to 0 and the flash firing is prohibited.

As described above, the algorithm shown in FIG. 5 makes it possible to judge whether or not the strobe light emission shown in FIG. 4 is possible. In this case, EV12.25 is an EV value that does not result in a small aperture, and EV9.25 is an E value for avoiding camera shake.
It is a V value. EV4.25 is the subject brightness that requires stroboscopic light emission.

Therefore, according to the second embodiment, the stroboscopic light is not emitted with a small aperture, and the stroboscopic light is surely emitted with a low luminance and the hand-shake photograph can be prevented at the film sensitivity which is frequently used.

Next, a third embodiment of the present invention will be described. FIG. 6 is a block diagram showing the outline of the third embodiment of the present invention. In the figure, the photometry unit 1, the film sensitivity detection unit 2, the exposure amount calculation unit 3, the first predetermined exposure amount setting unit 5, the second predetermined exposure amount setting unit 6, and the predetermined subject brightness setting unit 7 are Since it is exactly the same as the first embodiment described above,
The description is omitted here.

In the third embodiment, the method for determining the flash emission is not changed depending on the film sensitivity, but the first method is used.
3 of the predetermined exposure amount, the second predetermined exposure amount, and the predetermined subject brightness
It is possible to obtain exactly the same result as in the first embodiment only from the relationship between the determination value of 1 and the EV value and BV value at that time. Therefore, the flash emission permission / inhibition determination unit 23 in FIG. 6 includes the flash emission permission / inhibition determination unit 4 illustrated in FIG.
As described above, there is no input from the first predetermined film sensitivity setting unit 8 and the second predetermined film sensitivity setting unit 9 and no input from the film sensitivity input unit 2.

In the third embodiment, the EV value is less than or equal to the first predetermined exposure amount and the BV value is less than or equal to the predetermined subject brightness, or the EV value is less than or equal to the second predetermined exposure amount. , Allows the flash to be emitted.

Hereinafter, referring to the flow chart of FIG.
The processing operation of the third embodiment will be described. First, in step S11, the subject brightness is measured and the BV value is calculated. Next, in step S12, the film sensitivity is detected and the SV value is calculated. The method for detecting the film sensitivity is as described above. Succeedingly, in a step S13, E which is an appropriate exposure amount is obtained from the obtained BV value and SV value.
The V value is obtained.

Then, in step S14, it is determined whether the EV value is 12.25 or less. Here, if EV ≦ 12.25, it is outside the stroboscopic light emission region shown in FIG. 4, so the process proceeds to step S18, and stroboscopic light emission is prohibited. If EV ≦ 12.25, the process proceeds to step S15, and the BV value is 4.2.
A determination is made as to whether it is 5 or less.

In this step S15, BV ≦ 4.25
If it is, it is within the stroboscopic light emission area shown in FIG. 4, and therefore, the process proceeds to step S17, and the stroboscopic light emission is permitted. On the other hand, if BV ≦ 4.25 is not satisfied in step S15, the process proceeds to step S16, where the EV value is 9.25.
It is determined whether or not

If EV ≦ 9.25 in step S16, it means that the light emission is within the strobe light emission area shown in FIG. 4, so that the operation proceeds to step S17 to permit the strobe light emission. On the other hand, if EV ≦ 9.25, BV> 4.2
5 and EV> 9.25. Therefore, FIG.
Outside the stroboscopic light emission area shown in step S18,
Proceed to and the flash firing is prohibited.

Next explained is the fourth embodiment of the invention. FIG. 8 shows a fourth embodiment of the present invention.
FIG. 3 is a block diagram showing an embodiment when the strobe control device of the present invention having the configuration shown in FIG. 1 is applied to a camera capable of varying a focal length.

In FIG. 8, the photometric unit 1, the film sensitivity detecting unit 2, and the exposure amount calculating unit 3 are as described in FIG. The focal length detection unit 25 detects the current focal length,
The data corresponding to the focal length is output. In addition, the camera shake exposure amount calculation unit 26 uses the focal length detection unit 2
From the focal length data detected by No. 5, the shake EV, which is the limit exposure value at which the shake does not occur at the focal length at that time
And the telephoto shake EV, which is the limit exposure value at which the shake does not occur at the longest focus.

At this time, the tele-camera shake EV corresponds to the first predetermined exposure amount shown in FIG. 1, the camera shake EV corresponds to the second predetermined exposure amount, and the stroboscopic light emission permission / inhibition determination section 24, respectively.
Is output to. In addition, tele shake EV and shake EV are
It is also output to the first determination film sensitivity calculation unit 27 and the second film sensitivity calculation unit 28, respectively.

The first film sensitivity calculator 27 calculates film sensitivity data SV1 corresponding to the film sensitivity for switching the strobe light emission determination from the tele-camera shake EV and the predetermined subject brightness. Further, the second determination film sensitivity calculation unit 28 calculates the film sensitivity data SV2 corresponding to the film sensitivity for switching the flash emission determination from the camera shake EV and the predetermined subject brightness.

Here, SV1 corresponds to the first predetermined film sensitivity of FIG. 1, and SV2 corresponds to the second predetermined film sensitivity of FIG. The predetermined subject brightness is as described in FIG.

Then, the stroboscopic light emission permission / inhibition determination unit 24 calculates the subject brightness measured by the photometry unit 1, the appropriate exposure amount calculated by the exposure amount calculation unit 3, and the telephoto amount calculated by the camera shake exposure amount calculation unit 26. The shake EV and the shake EV, SV1 calculated by the first determination film sensitivity calculation unit 27, SV2 calculated by the second determination film sensitivity calculation unit 28, and the predetermined subject brightness from the predetermined subject brightness setting unit 7 Is entered. According to these input values, the stroboscopic light emission permission / inhibition determination unit 24 uses the same algorithm as that of the electronic flash emission permission / inhibition determination unit 9 in FIG.
Judges whether or not strobe light emission is enabled.

FIGS. 9 and 10 show the strobe light emission amount range of the camera controlled in the same embodiment on the diagram showing the relationship between the BV value, the SV value and the EV value, and further the TX value and the AV value. And the relationship with the program diagram showing the relationship with. The stroboscopic light emission region shown in FIG. 9 has the shortest focal length (wide).

Therefore, the judgment as to whether or not strobe light emission is possible is
When the SV value ≧ 8 (ISO800), strobe light emission is permitted on condition that the EV value is smaller than the EV value of 12.25 which is the time of the shake of the telephoto. Then, the EV value of 9.25, which is the time of hand shake in a wide range, is the predetermined subject brightness.
When the SV value is larger than 5 (SV2 in FIG. 8) which is a value obtained by subtracting 25, and the SV value is <8, the BV value ≦ 4.25.
Strobe emission is permitted on the condition that. Furthermore,
When the SV value is <5, the EV value is the time when the camera shake second is wide.
Strobe emission is permitted on condition that the V value is smaller than 9.25.

FIG. 10 is a diagram showing a stroboscopic light emission area in the case of the longest focus. In this case, the camera shake EV shown in FIG. 8 is equal to the tele camera shake EV. That is, in the case of the longest focus, stroboscopic light emission is permitted on condition that the EV value is smaller than the telephoto shake regardless of the ISO sensitivity. However, this is because the camera shake EV value at the longest focus is used as an example as a parameter corresponding to the first predetermined exposure amount shown in FIG. 1, and the present invention is not limited at all.

FIG. 11 is a flow chart for explaining the processing operation of the flash emission determination of the embodiment. The operation of the fourth embodiment will be described below with reference to this flowchart. First, in step S21, the subject brightness is measured and the BV value corresponding to the subject brightness is obtained. Next, in step S22, the film sensitivity is detected,
The SV value which is a value corresponding to the film sensitivity is obtained.
Then, in step S23, the calculation of EV = BV + SV is performed, and the EV value corresponding to the appropriate exposure amount is obtained.

Next, in step S24, the telephoto shake EV value which is the shake EV value at the longest focus and the shake EV value at the focal length at that time are obtained. Here, assuming that the camera of the embodiment uses a zoom lens whose focal length can be varied from 28 mm to 80 mm, the relationship between the focal length and camera shake EV is as shown in Table 1.

[0049]

[Table 1]

Therefore, the tele image shake EV is 1
2.32 is selected as the camera shake EV, which corresponds to the focal length at that time. If the focal length is 2
If it is 8 mm, the camera shake EV is 9.31.

Next, in step S25, the first determination film sensitivity SV1 is obtained. This SV1 is
It is calculated from the tele-shake EV obtained in step S24 and the predetermined subject brightness, and the following formula is used as the calculation formula. SV1 = telephoto-shake EV-predetermined subject brightness Here, in the present embodiment, the predetermined subject brightness is 4.2.
A value of 5 is used. Also, as mentioned above,
If the tele-shake EV is 12.32, SV1 will be 8.07, and approximately ISO800 will be the first determination film sensitivity.

Next, in step S26, SV2, which is the second determination film sensitivity, is obtained. This SV2
Is calculated from the camera shake EV obtained in step S24 and the predetermined subject brightness, and the following formula is used as the calculation formula. SV2 = camera shake EV-predetermined subject brightness Below, the algorithm of steps S27 to S33 is as shown in FIG.
Since it is the same as Steps S4 to S10 of No. 2, detailed description will be omitted. However, the value "8" of step S4 in the flowchart of FIG. 5 corresponds to SV1 in the flowchart of FIG. Similarly, the value "5" in step S6 in the flowchart of FIG.
The value "12.25" in step S8 and the value "9.25" in step S8 correspond to SV2, tele-camera shake EV, and camera shake EV in the flowchart of FIG. 11, respectively.

FIG. 12 shows a fifth embodiment of the present invention, in which the strobe control device of the present invention having the configuration shown in FIG. 6 is applied to a camera capable of varying the focal length. It is a block diagram which shows an example.

In FIG. 12, the photometry unit 1, the film sensitivity detection unit 2, the exposure amount calculation unit 3, and the predetermined subject brightness setting unit 7 have been described in detail in FIG. To do. The focal length detection unit 25 and the camera shake exposure amount calculation unit 26 have been described in detail with reference to FIG.

The strobe light emission permission / inhibition determination unit 29 determines whether or not strobe light emission is possible by inputting the subject brightness (BV), the proper exposure amount (EV), the tele-shake EV, the hand shake EV, and the predetermined subject brightness.

Next, with reference to the flow chart of FIG. 13, a processing operation for determining whether or not strobe light emission is possible according to the fifth embodiment will be described. Since the processing operations of the photometry in step S41, the film sensitivity detection in step S42, the proper exposure amount calculation in step S43, and the camera shake EV calculation in step S44 have been described in detail with reference to FIG. . The algorithm after step S45 is the same as the process after step S14 in FIG.

In the flow chart of FIG. 13, the values represented by the camera shake EV and the tele-camera shake EV are the values represented by concrete numerical values in the flowchart of FIG. That is, “12.2 in step S14 of FIG.
The value "5" corresponds to the camera shake EV in FIG. 13, and similarly, the value "9.25" in step S16 of FIG.
It corresponds to the value of camera shake EV. In FIG. 13, the value of camera shake EV is a value that depends on the focal length at that time, and the value of tele camera shake EV is a value that depends on the longest focal length of the camera, which makes it versatile. Is calculated by the following. However, it goes without saying that the value of the tele-camera shake EV may be a predetermined value as shown in FIG. 7 because one value is determined for one camera.

[0058]

As described above, according to the present invention, since the stroboscope does not emit light with a small aperture when a high-sensitivity film is used, waste of energy can be prevented. Also, when using the intermediate film, the subject brightness emitted by the strobe does not change depending on the film sensitivity,
It is possible to prevent the strobe from emitting light at the brightness where the strobe is necessary and producing a photograph with poor color balance under artificial light. Further, when the low-sensitivity film is used, the flash light is reliably emitted at an exposure amount that may cause camera shake, so that a camera shake photograph can be prevented.

[Brief description of drawings]

FIG. 1 is a block diagram showing an outline of a strobe control device according to an embodiment of the present invention.

FIG. 2 shows a second embodiment of the present invention and is a block diagram showing a configuration of a camera system to which a strobe control device of the present invention is applied.

3 is a mechanical view of a shutter unit 21 of FIG.

FIG. 4 is a diagram showing a stroboscopic light emission area of a camera controlled in the second embodiment on a diagram showing a relationship between a BV value, an SV value, and an EV value.

FIG. 5 is a flowchart illustrating the processing operation of the second embodiment.

FIG. 6 is a block diagram showing an outline of a third embodiment of the present invention.

FIG. 7 is a flowchart illustrating a processing operation of a third embodiment.

8 shows a fourth embodiment of the present invention, in which the strobe control device of the present invention having the configuration shown in FIG. 1 is applied to a camera capable of varying the focal length. It is a block diagram.

FIG. 9 shows a strobe light emission amount range when the focal length of the camera controlled in the fourth embodiment is the shortest focus (wide), B
It is the figure which showed on the diagram which shows the relationship of V value, SV value, and EV value, and also showed the relationship with the program diagram which shows the relationship between TX value and AV value.

FIG. 10 shows the strobe emission amount range in the case of the longest focus of the camera controlled in the fourth embodiment, which is the BV value, the SV value, and the EV.
It is the figure which showed on the diagram which shows the relationship with a value, and also showed the relation with the program diagram which shows the relationship with TX value and AV value.

FIG. 11 is a flowchart illustrating a processing operation of a flash emission determination according to a fourth embodiment.

FIG. 12 shows a fifth embodiment of the present invention, and FIG.
The strobe control device of the present invention having the configuration shown in
It is a block diagram which shows an Example at the time of being applied to the camera which can change a focal distance.

FIG. 13 is a flowchart illustrating a processing operation for determining whether or not strobe light emission is possible according to the fifth embodiment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Photometry part, 2 ... Film sensitivity detection part, 3 ... Exposure amount calculation part, 4 ... Strobe light emission possibility determination part, 5 ... 1st predetermined exposure amount setting part, 6 ... 2nd predetermined exposure amount setting part, 7 ... predetermined subject brightness setting section, 8 ... first predetermined film sensitivity setting section, 9
... second predetermined film sensitivity setting unit, 10 ... CPU, 11
... Strobe arc tube, 12 ... Strobe control circuit, 13 ... Photodiode, 14 ... Photometric circuit, 15 ... Motor, 16
... focal length variable magnification variable magnification motor drive circuit, 17 ... variable magnification lens, 18 ... comb teeth, 19 ... photointerplater, 20 ... P
I (photo interrupter) control circuit, 21 ... Shutter unit, 22 ... Switch.

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[Procedure amendment]

[Submission date] January 19, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction content]

The focal length-varying fold molar <br/> over motor drive circuit 16 for driving and controlling the motor 15 moves the zoom lens 17 according to an instruction from the CPU 10, is intended for changing the focal length. Further, the comb teeth 18 are rotated in conjunction with the movement of the variable power lens 17, and the photointerplater 19 converts the rotation amount into an electric pulse. The PI (photo interrupter) control circuit 20 controls the photo-interplater 19 and at the same time performs waveform shaping of the electric pulse output from the photo-interplater 18, and the CPU 1
Output to 0. In the CPU 10, the relative movement amount of the variable power lens 17 is obtained from the number of input pulses, and the focal length is calculated.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0044

[Correction method] Change

[Correction content]

[0044] FIGS. 9 and 10, the amount of flash light emission area of the camera to be controlled in the same embodiment, shown on the graph showing the relationship between the BV value and SV value and the EV value, further T V values, AV It shows the relationship with the program diagram showing the relationship with the value. The stroboscopic light emission region shown in FIG. 9 has the shortest focal length (wide).

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0046

[Correction method] Change

[Correction content]

FIG. 10 is a diagram showing a stroboscopic light emission area in the case of the longest focus. In this case, the camera shake EV shown in FIG. 8 is equal to the tele camera shake EV. That is, in the case of the longest focal length, strobe light emission is permitted on condition that the EV value is smaller than the telephoto shake EV regardless of the ISO sensitivity. However, this is because the camera shake EV value at the longest focus is used as an example as a parameter corresponding to the first predetermined exposure amount shown in FIG. 1, and the present invention is not limited at all.

[Procedure amendment 4]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

Claims (2)

[Claims] 1. A photometric unit for measuring subject brightness, a film sensitivity detecting unit for detecting film sensitivity, an exposure amount calculating unit for calculating an appropriate exposure amount based on the subject brightness and the film sensitivity, and the subject brightness. And a light emission possibility determination means for determining whether or not the strobe means emits light based on the film sensitivity and the proper exposure amount, and the light emission possibility determination means is such that the film sensitivity is higher than the first predetermined sensitivity. In this case, the strobe light is allowed to emit light on condition that the proper exposure amount calculated by the exposure amount calculating means is smaller than the first predetermined exposure amount, and the film sensitivity is lower than the first predetermined sensitivity. Second of sensitivity
Is between the predetermined sensitivity and the first predetermined sensitivity, the light emission is permitted under the condition that the subject brightness measured by the photometric means is lower than the predetermined brightness, and the film sensitivity is set to the first sensitivity. 2. If the sensitivity is lower than the predetermined sensitivity of 2, the strobe control device permits the strobe means to emit light on condition that the proper exposure amount is smaller than the second predetermined exposure amount. 2. A photometric unit for measuring subject brightness, a film sensitivity detecting unit for detecting film sensitivity, an exposure amount calculating unit for calculating an appropriate exposure amount based on the subject brightness and the film sensitivity, and the subject brightness. And a light emission possibility determination means for determining whether or not the strobe means emits light based on the film sensitivity and the proper exposure amount, and the light emission possibility determination means is the proper exposure amount calculated by the exposure amount calculation means. Is smaller than a first predetermined exposure amount and the subject brightness measured by the photometric means is lower than a predetermined brightness,
The light emission of the strobe means is satisfied when at least one of the second light emission condition when the proper exposure amount is smaller than the second predetermined exposure amount which is set to a value smaller than the first predetermined exposure amount is satisfied. A strobe control device characterized by permitting.