JPH05100283A - Exposure correction controller for ttl automatic dimmer system camera - Google Patents

Abstract

PURPOSE:To change the setting of an exposure correction amount at the time of setting a full automatic mode in a TTL automatic dimmer system camera and to satisfy the requirement of a senior photographer as well as a beginner. CONSTITUTION:A correction amount setting means 13 is provided as a dimming correction control system for controlling the exposure correction amount in a TTL automatic dimming control system which performs the photometry of reflected light on a film surface and controls to stop light emission. Set information is transmitted from the correction amount setting means to a correction amount adding means 6 connected to a film sensitivity setting means 7. A full automatic mode setting means 9 for transmitting the set information in the full automatic mode is connected to the correction amount setting means. The set information in the full automatic mode is transmitted to the correction amount setting means, and the correction amount is automatically set to '0' only at the time of changing the setting to a new full automatic mode. The correction amount before setting the full automatic mode is stored and it is reproduced at the time of changing the mode or the correction amount changed after setting the full automatic mode is used as it is at the time of changing the mode again.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a camera equipped with an electronic flash device (hereinafter referred to as a speedlight) and capable of performing synchronized photographing by the TTL automatic light control system.
The present invention relates to an exposure correction control device in a TL automatic light control camera.

[0002]

2. Description of the Related Art TTL automatic light control is a method for automatically measuring the amount of light emitted from a speedlight by measuring the instantaneous reflected light from the film surface that is being exposed through a lens with a light-receiving element built into the camera body. It is a method to control. Then, by adopting this, the usable aperture value can be enlarged, and the daytime synchro photography using the background can be easily performed. In particular, speedlight photography controls the appropriate amount of light for the main subject when shooting against the sun in the daytime, in the evening, or at night, and takes into account the balance with the background to obtain a more natural depiction. The advantages are large.

Various types of cameras having this kind of TTL automatic light control function have been conventionally known, and for example, a flash light from a speedlight incident through a photographing lens is measured by reflection on a film surface to perform a light control operation. Some of them have been able to correct the dimming level of the TTL automatic light control.

Further, as such a TTL automatic light control type camera, as shown in, for example, Japanese Patent Application Laid-Open No. 2-298925, when the camera is set in the fully automatic photographing mode, the TTL automatic light control is performed. It has been proposed that the light control level correction of (1) is prohibited and the correction level is forcibly set to "0". That is, in this conventional technique, means for determining whether or not the shooting mode is the fully automatic mode is provided, and when the fully automatic mode is set,
The means for always setting the correction value to "0" is provided.

[0005]

However, such a conventional device is mainly intended for use by a beginner, and it is necessary to prevent correction from being erroneously applied when the camera is in the fully automatic photographing mode. It is aimed at, and it has a problem that it is not easy to use and causes a problem in operability in the following cases. That is, when a photographer who is familiar with such a TTL automatic light control method wants to make a correction, the fully automatic mode cannot be selected as the shooting mode, and the correction must be performed by setting it to another mode. Therefore, when a photographer who is familiar with the TTL automatic light control method wants to perform exposure correction, he cannot select the fully automatic mode, and lacks operability in taking a photograph.

By the way, as a situation in which exposure compensation is necessary at the time of photographing by the TTL automatic light control system, there are cases where the reflectance of the subject is not standard, and where the proportion of the main subject within the angle of view is small. .. Then, in these cases, in the fully automatic mode, since correction is automatically performed by various conventionally proposed techniques, it is considered that the correction by the photographer is unnecessary.

However, even in such a fully automatic mode, there are cases where the exposure correction of the TTL automatic light control should not be prohibited. For example, in the TTL automatic light control system, the light control operation is performed by assuming the reflectance of the film to be an average value, but the reflectance actually varies depending on the brand and type of the film, and the reflectance is The farther from the average value, the more the dimming level is affected. In such a case, a photographer who is familiar with the characteristics of the film may make a positive correction when using a film having a high reflectance, or a negative correction when using a film having a low reflectance. Met.

Therefore, a photographer who is familiar with the TTL automatic light control method may want to perform exposure compensation without being restricted by the photographing mode, while a beginner may not be able to set the exposure compensation when the fully automatic mode is set. It was desirable that the correction should not be applied easily.

The present invention solves such apparently contradictory problems, and is easy for both beginners and advanced users to use, and exposure in a TTL automatic light control type camera that can perform desired exposure correction control. The purpose is to obtain a correction control device.

[0010]

In order to meet such a demand, an exposure correction control device in a TTL automatic light control camera according to the present invention corrects a light control level to a light measuring means in a TTL automatic light control system. , A correction amount setting unit that constitutes a dimming correction control system that is performed via a correction amount adding unit that adds information from the film sensitivity setting unit to the correction amount, and a fully automatic mode setting that transmits setting information of the fully automatic mode Means for transmitting the fully automatic mode setting information to the correction amount setting means, and automatically setting the correction amount to "0" only when the setting is changed from the non-fully automatic mode to the fully automatic mode. It is composed.

Further, according to the present invention, when the fully automatic mode is newly set, the correction amount before that is stored and the correction amount is set to "0", and when the mode is changed to another mode thereafter. , The original stored correction amount is reproduced and used.

Further, according to the present invention, when the correction amount is changed after the new fully automatic mode is set,
Even when the correction amount is changed to another mode, the correction amount is used as it is.

[0013]

According to the present invention, the exposure correction amount is automatically set to "0" only when a new fully automatic mode is entered, so that the correction can be reset thereafter.

Further, according to the present invention, when a new fully automatic mode is set, the exposure correction amount before that is stored,
Since the original correction amount is reproduced and used when changing to another mode after that, it is not necessary to reset the correction amount set to "0".

Further, according to the present invention, when the correction amount is reset after newly entering the fully automatic mode, the correction amount is used as it is even when the mode is changed to another mode, The latest set value is always valid.

[0016]

1 and 2 are a schematic block diagram showing a first embodiment of an exposure correction control apparatus in a TTL automatic light control camera according to the present invention and a flow chart for explaining its control operation.

First, in FIG. 1, reference numeral 1 is photometric means,
The photometric means 1 is composed of means for performing TTL photometry of flash light of a speedlight (light emitting means 20) by reflection on a film surface (not shown), for example, a silicon photodiode and a light receiving amplifier. The output of the photometric means 1 is integrated by the integrating means 2 in the light quantity during the flash. Here, the reset means 10 is, for example, a synchro contact (not shown).
Until the is closed, the integration amount is set to "0" by a method such as discharging the integration capacitor of the integration means 2. And
When the flashing is started by the light emission starting means 22 which controls the light emitting means 20 by operating the release means 21, the resetting means 10 does not act on the integrating means 2 due to the information from the light emitting starting means 22. The means 2 outputs the light amount integral. This output and the output of the reference level 5 corresponding to the appropriate light quantity are compared by the comparing means 4, and when the integrated value of the light quantity of the integrating means 2 becomes equal to or higher than the reference level, the output of the comparing means 4 is inverted and the light emission of the speedlight is stopped. The flash is stopped by means 11. The above is the basic configuration of the TTL automatic light control system. In addition, in FIG. 1, the left side in the figure shows the camera side, and the right side shows the speedlight side.

On the other hand, the film sensitivity and exposure correction for the light control by the above-mentioned TTL automatic light control system is performed by the light control control system having the following configuration. That is, the gain setting means 3 can change the gain of the light receiving amplifier of the photometric means 1, and the set value thereof is, for example, the film sensitivity setting means 7 by reading the DX code of the film.
Based on the output of. In addition, the photometric means 1, the integration means 2, the gain setting means 3, the comparison means 4, the reference level 5, which are described above,
The structure of the film sensitivity setting means 7 is, for example, JP-A-1-29.
This technique corresponds to the technique disclosed in Japanese Patent No. 7635, and detailed description thereof will be omitted.

For the exposure correction in the exposure correction control system as described above, the correction amount adding means 6 is provided between the film sensitivity setting means 7 and the gain setting means 3, and the film sensitivity is lowered as if the plus correction was made. In this way, the information from the film sensitivity setting means 7 may be processed so that the film sensitivity may be increased in the negative correction. Further, the correction amount transmitted to the above-mentioned correction amount adding means 6 is
Correction amount setting means 13 provided on the speedlight side
Is set by the photographer and transmitted from the communication means 12 on the speedlight side to the communication means 8 on the camera side, and the correction amount adding means 6
It is supposed to be input to. The correction amount described above is displayed on the display unit 14 provided on the speedlight side.

In the TTL automatic light control type camera equipped with the exposure compensation control device having the above-mentioned configuration, when the fully automatic mode is selected as the photographing mode, the fully automatic mode setting means 9 indicates that the setting has been made. Signal enters the communication means 8 on the camera side and is transmitted to the communication means 12 on the speedlight side as, for example, a 1-bit flag [AUTO MODE] in serial communication. Then, the correction amount setting means 13 performs the following correction control based on this flag [AUTO MODE].

That is, the above-mentioned correction amount setting means 13 comprises an input member and a microcomputer,
The operation will be described with reference to the flow chart of the microcomputer shown in FIG. Here, FIG. 2 is a subroutine executed after communication with the camera, for example. The flags used here are defined as follows. That is, the flag [AUTO MODE] is "1" when the fully automatic mode is set, and "0" in other modes. On the other hand, the flag [OLD MODE] is set to the flag [AUTO MODE] referred to in the previous subroutine.

In the subroutine starting from step 100, first, at step 101, the flag [OLD MOD
E], when it is “0”, that is, only when the previous time is not the fully automatic mode, the process proceeds to step 102. Then, the flag [AUTO MODE] received most recently in step 102 is checked, and when it is "1", that is, only in the case of the fully automatic mode, the process proceeds to step 105, and the correction amount is set to "0". In other cases, or when step 105 ends, step 10
In step 3, the flag [OLD MODE] is substituted with the flag [AUTO MODE] to prepare for the next processing, and the process returns in step 104. Therefore, the correction amount automatically becomes "0" only when the flag [AUTO MODE] changes from "0" to "1". That is, when the fully automatic mode is newly selected, the correction amount is automatically set to "0", and a setting error for a beginner can be prevented. Further, while the fully automatic mode is selected thereafter, steps 101 and 103 are processed, and step 105 is bypassed, so the correction amount does not become "0". Therefore, in this state, the correction amount can be reset to an arbitrary value at the discretion of the photographer.

According to such a configuration, when a beginner newly selects the fully automatic mode, not only can he / she forget to reset the correction amount of the speedlight to "0", but also the fully automatic mode. You can also satisfy the demands of advanced users who want to perform exposure compensation in.

FIG. 3 is a flow chart showing the second embodiment of the present invention. That is, in the above-described first embodiment shown in FIG. 2, when the fully automatic mode is newly selected, the correction amount becomes “0”, and even if the mode is subsequently returned to another mode, the correction amount becomes “0”. It remains. In the second embodiment, when the setting is returned from the fully automatic mode to another mode, the correction amount before that is automatically reset. The components are the same as those in the first embodiment described above, but the control is performed according to the flowchart shown in FIG.

In the flow chart of FIG. 3, FIG.
The difference from the first embodiment shown in FIG. 5 is that the correction amount up to that point is stored in step 106 before the correction amount is set to “0” in step 105. And step 1
If it is determined in step 107 that the setting has been changed to another mode after it is determined in 01 that the mode is the fully automatic mode, it is determined in step 108 that the fully automatic mode has ended and the above-described steps are performed. The correction amount stored in 106 is reproduced. If you do this,
The correction amount before being set to the full-automatic mode can be automatically restored, and the easy-to-forget operation of performing the setting operation again from the state where the correction amount is “0” can be eliminated.
It is convenient in terms of operation.

FIG. 4 is a flow chart showing the third embodiment of the present invention. The third embodiment is an extension of the second embodiment according to FIG. 3 described above, and when the correction is applied in the fully automatic mode, the changed value is set and changed to another mode thereafter. It is configured to be adopted even in the case of In this case as well, similar to the above-described second embodiment, the same constituents as those of the first embodiment are provided, and only the control thereof is performed according to the flowchart of FIG.

The difference in the flowchart of FIG. 4 is that it is determined in step 109 whether the correction amount in the fully automatic mode is "0" before reproducing the original correction amount in step 108. is there. And
If the correction amount is "0", the process directly proceeds to step 108 and the stored correction amount is reproduced. On the other hand, when the correction amount is not “0”, it means that the correction amount is newly set during the period set in the fully automatic mode. Therefore, the set value is validated and step 108 is jumped. ing. By doing so, the latest set value is always effective as the exposure correction amount, which is convenient for the photographer.

The present invention is not limited to the structure of the embodiment described above, and it is needless to say that the structure of each part can be appropriately changed. Further, as the TTL automatic light control type camera to which the present invention is applied, the camera described in the embodiments and the speedlight may be independent, or a camera with a built-in speedlight may be used. In this latter case,
As the communication means 8 and 12, there are those having the function, but it is not necessary to be particularly aware of their existence.

[0029]

As described above, the TTL according to the present invention
According to the exposure compensation control device in the automatic light control camera,
The correction amount is automatically set to "0" only when a new fully automatic mode is selected from the non-fully automatic mode. Therefore, while the beginner selects the fully automatic mode, the correction amount of the speedlight can be changed. There are various excellent effects that the problem of forgetting to reset it to "0" is eliminated, and the demand of advanced users who want to perform exposure correction in the fully automatic mode can be satisfied.

Further, according to the present invention, even in the fully automatic mode, the exposure correction is not uniformly prohibited. Therefore, when a certain mode (fully automatic mode) is set, all operations relating to the exposure correction become invalid. It is possible to obtain a camera that can be eliminated and can perform exposure compensation that is easy for the user to understand. That is, if the user's will is fully respected and the exposure correction operation is performed, the exposure correction can be performed at any time, and the effect as a function of the TTL automatic light control camera can be exhibited.

Further, according to the present invention, when the mode is changed from the full-automatic mode to another mode, the original correction tone can be reproduced, and the latest set value is made effective as the correction amount, so that the camera is easy to use. It is possible to obtain a TTL automatic light control type camera which is good and convenient in operation.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of an exposure correction control device in a TTL automatic light control camera according to the present invention.

FIG. 2 is a flowchart of the first embodiment of the present invention.

FIG. 3 is a flowchart of a second embodiment of the present invention.

FIG. 4 is a flowchart of a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Photometric means 2 Integrating means 3 Gain setting means 4 Comparison means 5 Reference level 6 Correction amount adding means 7 Film sensitivity setting means 8 Communication means 9 Fully automatic mode setting means 10 Reset means 11 Light emission stopping means 12 Communication means 13 Correction amount setting means 14 display means 20 light emitting means 21 release means 22 light emission starting means

Claims (3)

[Claims] 1. A photometric means for photometrically measuring the light reflected on the film surface, an integrating means for integrating the output of the photometric means from the start of flashing, a reference level, and a comparing means for comparing the output of the integrating means with the reference level. And a TTL automatic light control system consisting of a light emission stopping means for stopping flashing by the output of the comparing means, a film sensitivity setting means, a correction amount adding means, a correction amount setting means, and a fully automatic mode setting means. A dimming correction control system consisting of, and the correction amount adding means adds a correction amount to the output of the film sensitivity setting means in accordance with the output of the correction amount setting means and transmits it to the gain setting means. The gain setting means variably controls the amplification factor of the photometric means to perform TTL automatic light adjustment, and when a new fully automatic mode is set, the correction amount setting means supplements it. An exposure correction control device in a TTL automatic light control camera, characterized in that the positive amount is configured to be "0". 2. The exposure correction control apparatus for a TTL automatic light control camera according to claim 1, wherein when a fully automatic mode is newly set, the correction amount before that is stored and the correction amount is set to “0”. The exposure in the TTL automatic light control camera is characterized in that the original stored correction amount is reproduced and used when the mode is changed to another mode thereafter. Correction control device. 3. The exposure correction control device for a TTL automatic light control camera according to claim 2, wherein when the correction amount is changed after a new fully automatic mode is set, the correction amount is changed to another value. An exposure correction control device in a TTL automatic light control camera, which is configured to be used as it is even when the mode is changed again.