JPH01191833A - Flash photographing device - Google Patents

Abstract

PURPOSE:To realize flash photographing by a correct exposure without being brought to release lock by switching a flash photographing mode to an automatic TTL light control mode, when the device is set to a mode for controlling automatically a diaphragm at the time of flash photographing. CONSTITUTION:A flash photographing mode setting means 201 sets one mode of a first flash photographing mode by the automatic TTL light control and a second flash photographing mode by an external light control or a manual control. Also, an exposure control mode setting means 202 sets one mode of a first exposure control mode by a manual exposure control mode or a diaphragm priority mode, and a second exposure control mode by a program or a shutter priority mode. When the second exposure control mode is set at the time of setting the second flash mode, a photographing control means 203 switches a flash photographing mode to the first flash photographing mode, and permits photographing by the second exposure control mode. In such a way, even if the flash photographing mode and the exposure control mode are set unsuitably, it does not occur that the device is brought to release lock.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a flash photography device for a camera, and particularly to one that optimally combines a flash photography mode and an exposure control mode.

B. Prior art The applicant previously discovered that when the camera is set to an exposure control mode, such as program mode or shutter priority mode, in which the aperture is automatically controlled according to the shooting conditions taken in at the time of release, the flash photography mode is We have proposed a flash photography device that warns of non-compliance or prohibits photography with a release lock when external light control other than TTL automatic light control or manual mode is set.
86557), this is because in external light control mode and manual mode, it is necessary to set the aperture to the aperture value specified by the flash photography device, so this is different from exposure control mode in which the camera automatically controls the aperture. This is because in a combination, there is a very small possibility that the aperture value instructed by the flash photography device and the aperture value controlled by the camera side will match. Furthermore, there is also known a camera in which when an external light control mode or a manual mode is set, the camera receives a signal from an electronic flash device, and the camera automatically controls the aperture value in accordance with the signal.

Problems to be Solved by the C0 Invention However, with the former of the above-mentioned conventional cameras, when the release is locked, it is not possible to take a picture even though the composition has been determined, resulting in a lack of quick-shooting performance, and the problem is that only a warning is issued. In this case, you can take pictures, but the correct exposure cannot be obtained.

In addition, in the latter case, if it is necessary to set the aperture value to a large value in external light control mode, for example when the loaded form has low sensitivity, the maximum aperture value of the attached lens is selected in external light control mode. There is a high possibility that the aperture is smaller than the aperture value, and in such a case, proper exposure will not be obtained.

An object of the present invention is to forcibly switch the flash photography mode to a TTL automatic light control mode when the camera is set to an exposure photography mode that automatically controls the aperture during flash photography, thereby solving the above-mentioned problem. The object of the present invention is to provide a flash photography device that solves the problem.

Means for Solving the D0 Problem Explained with reference to FIG. 1, which is a diagram corresponding to claims, the flash photography device according to the present invention has a first flash photography mode using TTL automatic light control, and a second flash photography mode using external light control or manual light control. a flash photography mode setting means 201 for setting either one of the flash photography modes; a first exposure control mode using manual exposure control mode or aperture priority mode; and a second exposure control mode using program or shutter priority mode. an exposure control mode setting means 202 for setting one of the modes; and an exposure control mode setting means 202 that allows photography in the first and second exposure control modes when setting the first flash photography mode, and setting the second flash photography mode. Sometimes, when the second exposure control mode is set, a photographing control means 203 is provided which switches the flash photography mode to the first flash photography mode and allows photography in the second exposure control mode.

When the second exposure control mode with program or shutter priority is set when the second flash photography mode is set by external light control or manual, the photography control means 203 changes the flash photography mode to the second exposure control mode by TTL automatic light control. The camera switches to the first flash photography mode and allows photography in the second exposure control mode. As a result, even if the flash photography mode and the exposure control mode are set to be incompatible, quick shooting performance is ensured without the release being locked, and flash photography can be performed with proper exposure.

F. Embodiment An embodiment of the present invention will be described based on FIGS. 2 and 3.

In FIG. 2, a photographing lens body 10 including a lens L is shown.
has a well-known lens bayonet part 11, and the lens body 10 is attached to the camera body 100 by removably engaging the lens bayonet part 11 with a bayonet part (not shown) on the side of the camera body 100. Retained.

Reference numeral 12 denotes an aperture that determines the amount of light passing through the lens L, and is normally biased by a spring 13 in the direction of the minimum aperture through which the amount of light passing through is small. The aperture ring 14 is interlocked with the aperture 12 by a well-known interlocking means, and when the aperture ring 14 is rotated, the aperture 12 can be changed from the minimum aperture to the maximum aperture against the spring 13, and can be set to a predetermined aperture. Can be done.

Further, the photographic lens body 10 is provided with a lens information circuit 15 storing various lens information, and when the photographic lens body 10 is attached to the camera body 100, a contact 51 on the lens side and a contact 52 on the camera body 100 side are provided. When conductive, the lens information in the lens information circuit 15 is transferred to the camera body 1.
It becomes possible to input to the control circuit 21 in 00.

Part of the light from the subject that has passed through the lens L passes through the main mirror 22 in the camera body 100, and the other part is reflected toward the screen 23. As is well known, the screen 23 is in a conjugate relationship with the film surface, and the light reflected by the main mirror 22 is diffused by the screen 23, passes through the pentaprism 24, and some of it is guided to the eyepiece 29, while the other part is guided to the eyepiece lens 29. A part of the light is guided to a light receiving element 25 for photometry.

The light receiving element 25 outputs a detection signal corresponding to the amount of light received to the photometry circuit 30, and the photometry circuit 30 calculates photometry information regarding the brightness of the subject based on this detection signal and outputs it to the control circuit 21. Furthermore, when a cartridge is attached to the camera body 100 and the film information section 70 of the cartridge comes into contact with the contact 55 of the camera body 100, film sensitivity information is input to the control circuit 21. The control circuit 21 is
An exposure value is calculated based on this photometric information and film sensitivity information, and the exposure value is displayed in the finder by lighting or blinking the exposure display section of the LED 26 for displaying in the finder. Further, the display LED 26 is also provided with a ready light that indicates the completion of charging of the flash device 40, which will be described later.

A switch SWI connected to the control circuit 21.

SW2 is a switch that is turned on in conjunction with a release button (not shown); when the release button is pressed halfway, the switch SWI is turned on, and when the release button is pressed fully, the switch SW2 is turned on.

27 is an aperture dial provided on the camera body,
The aperture value is determined by matching the letters and numbers on the dial 27 with the index 28. For example, when each number is matched with the index 28, the control circuit 21 sets the aperture priority mode (first exposure control mode), The numerical aperture value is stored in the memory, and when the fully pressed switch SW2 is turned on, an aperture drive signal is output to the drive circuit 31 in order to drive and control the aperture 12 to this value. Furthermore, when the letter S is aligned with the dial indicator 28, the control circuit 21 sets the shutter priority mode (second exposure control mode) and, based on the brightness information of the photometry circuit 30, changes the film F to the set shutter speed. In order to automatically drive and control the aperture 12 to an aperture value calculated to provide proper exposure, an aperture drive signal is output to the drive circuit 31.

The drive circuit 31 is actuated by a signal from the control circuit 21 when the full-press switch SW2 is turned on, and the drive circuit 31 operates by a signal from the control circuit 21,
A drive mechanism 33 is operated by a motor 32 built in the motor 32. The drive mechanism 33 moves the main mirror 22 between the observation position and the position outside the photographing optical path, and controls the aperture 12 of the photographic lens body 10.

This mechanism performs a series of camera operations such as winding the film F and charging the shutter curtain 34.

4o is an electronic flash device having a light receiving element 41 for external light control; when attached to the camera body 100, contacts 53 and 54 are turned on, and the detection signal of the light receiving element 41 is transmitted to the control circuit 21 in the camera body 100; can be input. Further, the electronic flash device 40 is provided with a flash photography mode switching button 42, and when the electronic flash device 40 is used for flash photography, when the switching button 42 is switched to the "A" position, the external light control mode is selected.
When the second flash photography mode) is switched to the rTTLJ position, the TTL automatic light control mode (first flash photography mode) is respectively set. When external dimming mode is set,
When the flash discharge tube (not shown) in the electronic flash device 40 emits light, the external light receiving element 41 directly receives the light from the subject, and when the amount of received light reaches a predetermined amount, the electronic flash bag [
6 outputs a light emission stop signal to stop light emission of 40;
In addition, when the TTL automatic light control mode is set, when the flash discharge tube emits light, the light that passes through the main mirror 22 is reflected by the film F, and is then received by the light receiving element 61 for TTL light control. When the amount of light received by 61 reaches a predetermined value,
A signal is output to the control circuit 21, and in response, the control circuit 21 outputs a light emission stop signal to the electronic flash device 40.

In the configuration of the above embodiment, the control circuit 21 includes a flash photography mode setting means 201 and an exposure control mode setting means 202.
and photographing control means 203.

Next, the procedure of photographing operation during flash photography will be explained based on the flowchart of FIG.

In FIG. 3, when the half-press switch SW1 is turned on, this program is started, and first, in step S1, brightness information from the photometry circuit 30, lens information from the lens information circuit 15, and film sensitivity information from the film information providing section 50 are sent. Along with loading.

The control circuit 21 responds to the operation of the flash photography mode switching button 42.
In response to the operation of the aperture dial 27, the exposure control mode information stored in the control circuit 21 is read.

Next, in step S2, it is determined whether the TTL automatic light control mode or the external light control mode is selected from the flash photography mode information read in step S1. If it is determined that the TTL automatic light control mode is set, the process proceeds to step S3, and it is determined whether or not the shutter priority mode is set based on the exposure control mode information read in step S1. If it is determined that the shutter priority mode is selected, the process proceeds to step S4, where an aperture value is calculated and set from the film sensitivity information read in step S1. If step S3 is negative, that is, if the mode is manual mode or aperture priority mode, the process proceeds to step S25, where the aperture value is set to the value input with the aperture dial 27, and the process proceeds to step S5.

Further, if step S2 is negative, that is, if the external light control mode is selected, the process proceeds to step 826, and it is determined whether or not the shutter priority mode is selected. If denied, step S
The process proceeds to step S27, where the aperture value is set to the value input using the dial 27, and the process proceeds to step S5. When step 826 is determined, the flash photography mode is switched to TTL autoflash mode in step 828, and the aperture value is calculated and set based on the read film sensitivity information in step 329.
After that, the process advances to step S5.

In step S5, it is determined whether the full-press switch SW2 is on. If the determination is affirmative, the process proceeds to step S6, and if the determination is negative, it is determined in step S30 whether the half-press switch SW1 is on. If step S30 is affirmed, the process returns to step S5, and if negative, the process is ended.

In step S6, the aperture is driven to the set aperture value.
Next, in step S7, it is determined whether the flash photography mode is the TTL automatic light control mode. If affirmed, step S
After the front curtain of the shutter 34 is run in step S9
Then, the flash discharge tube (not shown) of the electronic flash device 40 is caused to emit light, and the process proceeds to step S10. In step SIO, a detection signal from the TTL automatic light receiving element 61 is read, and in step Sll, it is determined whether the amount of received light has reached a predetermined value. If it is determined that the posture is determined, the process proceeds to step S12, and if the determination is negative, the process remains in step Sll until the determination is made that the posture is determined, and then the process proceeds to step S12. In step 81.2, the flash discharge tube stops emitting light, then in step S13 the trailing curtain of the shutter is moved, and in step 814, processing such as winding the film one frame is performed, and the photographing procedure is completed.

On the other hand, if step S7 is negative, the process proceeds to step S21, the shutter front curtain is run, and the flash discharge tube is caused to emit light in step S22. Thereby, reflected light from the subject is received by the light receiving element 41 for automatic light control. When the amount of received light reaches a predetermined value, the electronic flash device 140 outputs a light emission stop signal and stops light emission.

Next, in step S23, the shutter trailing curtain is moved, and in step S24, processing such as winding the film by one frame is performed, and the photographing procedure is ended.

According to the above procedure, if shutter priority mode is set while external light control mode is set, flash photography mode will automatically switch to TTL autoflash mode and take a picture, so flash photography mode Even if the and exposure control mode are incompatible with each other, the release is not locked and photography is performed with proper exposure.

Note that although the external light control mode has been shown as the second flash photography mode above, a manual mode may also be used. Furthermore, although the shutter priority mode is shown as the second exposure control mode, it may also be a program mode. Furthermore, the first exposure control mode may be a manual mode.

G0 Effects of the Invention According to the present invention, when the exposure control mode by program mode or shutter priority mode is set when the second flash photography mode is set by external light control mode or manual mode, the flash photography mode is set to T'I'. Since switching to L autoflash mode allows shooting in the control mode described above, even if the exposure control mode and flash shooting mode are incompatible during flash photography, the release will not be locked as before. It is possible to provide a camera that can take pictures with proper exposure without any problems, has excellent quick-shooting performance, and has improved usability.

[Brief explanation of the drawing]

FIG. 1 is a complaint correspondence diagram. 2 and 3 show an embodiment of the present invention, FIG. 2 is a block diagram showing the overall configuration of a flash photography device according to the invention, and FIG. 3 is a flowchart showing a processing procedure. 10: Photographic lens 12: Aperture 21: Control circuit 27: Aperture dial 40: Electronic flash device 42: Flash photography mode selection switch 100: Camera body 201: Flash photography mode setting means 202: Exposure control mode setting means 203: Photography control means Patent applicant Nippon Kogaku Kogyo Co., Ltd. Representative patent attorney Fuyu Nagai Figure 2

Claims (1)

[Scope of Claims] Flash photography mode setting means for setting either a first flash photography mode using TTL automatic light control or a second flash photography mode using external light control or manual exposure, and manual exposure. exposure control mode setting means for setting one of a first exposure control mode based on a control mode or an aperture priority mode and a second exposure control mode based on a program mode or a shutter priority mode; and the first flash. When setting the shooting mode, shooting is allowed in the first and second exposure control modes, and when setting the second flash photography mode, when the second exposure control mode is set, the flash photography mode is changed to the second exposure control mode. 1. A flash photography device comprising: a photography control means for switching to the first flash photography mode and permitting photography in the second exposure control mode.