JPH03101720A - Camera capable of changing photographic condition - Google Patents

Abstract

PURPOSE:To change photographic conditions according to past photographic conditions by giving a discrimination signal to a frame when it is decided that stored photographic information satisfies specific conditions or do not satisfy them. CONSTITUTION:A storage means 101 is stored with photographic information (e.g. subject brightness) at the time of photography. Then a decision means 102 decides whether the stored photographic information at the time of the photographic satisfy the specific conditions or not, frame by frame, and a dis criminating means 103 gives the discrimination signal to the frame when it is decided that the specific conditions are satisfied or not satisfied. Namely, when it is estimated that a shaking of hands is caused for the object brightness at the time of the photography of one frame, the frame is given the discrimina tion signal. Consequently, the photographic conditions are changed to preclude the shaking hands and defocusing without any trouble resulting from the exces sive change of the photographic conditions.

Description

[Detailed Description of the Invention] A. INDUSTRIAL APPLICATION FIELD The present invention relates to a camera in which photographing conditions can be changed. B. - Prior Art Conventionally, cameras have been known that automatically cause an electronic flash device to emit light when the subject is dark. In other words, this type of camera uses a photometer to detect the brightness of the subject, and based on this, determines the exposure value 7 (aperture value, shutter speed) from a predetermined program diagram. If the shutter speed is less than a predetermined camera shake limit value (for example, 1760 seconds), a photograph is taken at a higher shutter speed and the electronic flash device automatically fires. This prevents camera shake and allows you to take pictures with proper exposure.

Furthermore, in some single-lens reflex cameras in particular, it is possible to select between a normal exposure control program and a high-speed program, and by selecting the high-speed program, the shutter speed is increased to prevent camera shake.

C. Problems to be Solved by the Invention Incidentally, the shutter speed at which camera shake occurs varies depending on the photographer, but in the former camera mentioned above, the camera shake limit shutter speed that determines whether or not the electronic flash device emits light is fixed. This will cause inconvenience. That is, for example, when taking a picture with a camera whose camera shake limit value is 1/60 second, a photographer who is prone to camera shake even at 1/80 second cannot prevent camera shake. This kind of problem can be solved by shifting the camera shake limit value to the high speed side and allowing the electronic flash device to fire even at a fairly fast shutter speed, but in this case, the frequency of flashing by the electronic flash device will increase. There is a problem that the life of the power battery is shortened. In addition, with cameras that have the latter high-speed program, skill is required to judge under what circumstances the high-speed program should be selected, and if you use the high-speed program excessively, the aperture will open as much as the shutter speed becomes faster. Therefore, there is a problem that the depth of field becomes shallow and it becomes difficult to focus.

A technical problem of the present invention is to change photographing conditions according to past photographing situations.

D. ．． Means for Solving the Problem Explained with reference to FIG. 1, which is a diagram corresponding to the claims, the camera according to the claimed invention includes a storage means 101 for storing photographing information at the time of photographing, and a storage means 101 for storing photographing information at the time of photographing. Judgment means 10 that judges whether the conditions are satisfied or not for each photograph of each frame.
2, and an identification means 103 for giving an identification signal to the piece when it is determined that the predetermined condition is satisfied or not satisfied. storage means 1
01, a determining means 102, and an identifying means 103, a selecting means 201 for selecting information to which an identification signal is attached from stored photographing information, and an operating member 202 operated to change photographing conditions. and the operating member 202
The apparatus further includes a changing means 203 for changing the photographing conditions based on the selected photographing information in accordance with the operation.

E. Effect (1) The invention storage means 101 of claim 1 stores photographing information (for example, subject brightness) at the time of photographing. The determining means 102 determines whether or not the stored photographic information at the time of photographing satisfies a predetermined condition for each photographing of each frame, and the discriminating means 103 determines whether or not the stored photographic information at the time of photographing satisfies a predetermined condition. If so, an identification signal is assigned to that piece. That is, for example, if it is estimated that camera shake will occur due to the subject brightness at the time of photographing a certain frame, an identification signal is given to that frame.

The stored photographing information of each frame and the presence or absence of an identification signal for each frame are transmitted, for example, to another device, and this device determines photographing conditions based on the photographing information of the piece to which the identification signal has been attached, and this is transmitted to the camera. It will be done. The camera changes the shooting conditions based on the transmitted results. That is, for example, the luminance limit subject brightness is changed to the high brightness side. (2) The invention selection means 201 of claim 2 selects information to which an identification signal has been added from the stored photographic information. When the operating member 202 is operated, the changing means 203 changes the photographing conditions as described above based on the selected ° photographing information. F. Embodiment An embodiment of the present invention will be explained with reference to FIGS. 2 to 5.

In FIG. 2 showing the overall configuration, a control circuit 1 includes a photometry circuit 2, a distance measurement circuit 3, a light emission control circuit 4 for an electronic flash device,
An exposure control circuit 5 and switches SW1 to SW3 are connected.

The photometry circuit 2 detects photometry information regarding the brightness of the object (subject brightness) and inputs it to the control circuit 1, and the distance measurement circuit 3 detects distance information regarding the distance to the object (subject distance) and inputs it to the control circuit fjPtl. input. The light emission control circuit 4 is
In response to a charging signal from the control circuit 1, a main capacitor (not shown) stores charge for light emission (charging), and in response to a light emission signal from the control circuit 1, the stored charge charges the xenon tube ( (not shown) to emit light. The exposure control circuit 5 performs photographing by driving an aperture and a shutter (not shown) according to commands from the control circuit 1.

The switches SWI and SW2 are switches that are turned on in conjunction with the operation of 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. The control circuit 1 operates the above-described photometry circuit 2 and distance measurement circuit 3 when the switch SWI is turned on, and operates the exposure control circuit 5 when the switch SW2 is turned on to perform photographing.

The switch SW3 is a switch that is turned on in conjunction with the operation of a camera shake prevention button (not shown), and the user can turn it on when looking at photos taken with this camera and printed in the lab and feeling that there is a lot of camera shake. Operate the anti-shake button. When the switch SW3 is turned on by this operation, the control circuit 1
Change shooting conditions to prevent camera shake.

Here, in the camera of this embodiment, appropriate exposure is obtained by determining the exposure value (aperture value, shutter speed) according to the subject brightness (hereinafter referred to as EV value) based on the program diagram shown in Figure 3. That's what I do. What is this EV value? Photometric information (brightness of the subject) obtained by the photometric circuit 2 described above
and the film sensitivity obtained from the DX code of the loaded cartridge, and the smaller the value, the darker the subject is. In this embodiment, this EV value corresponds to photographing information.

Then, a photographing condition that automatically causes the electronic flash device to emit light when the EV value is, for example, below EV9.5 (point A in the figure) is input to the control circuit 1 at the time of camera manufacture. In other words, according to this program diagram, the shutter speed is 1/45 seconds at EV9.5, and if the shutter speed is slower than this, there is a high possibility that camera shake will occur, so the shutter speed should be kept at 1745 seconds or more. Automatically fires the electronic flash device.

In this way, the EV that determines the presence or absence of light emission from the electronic flash device
The value (EV9.5 here) is hereinafter referred to as the emission limit EV value. Expressed in EVL.

However, depending on the photographer, the shutter speed may be 1/4
Camera shake may occur even if the speed is faster than 5 seconds. Therefore, the control circuit 1 stores the EV value calculated when photographing each frame, and when the switch SW3 is turned on later, the light emission limit EV is set based on the stored EV value as described later.
Change the value. Next, the operation of the embodiment will be explained with reference to the flowcharts of FIGS. 4 and 5.

FIG. 4 shows the processing procedure at the time of photographing. When the half-press switch SWI is turned on, this program is started, and first, photometry processing is performed in step S1.

That is, the photometry circuit 2 is activated and photometry information, which is the detection result thereof, is read. Next, in step S2, distance measurement processing is performed. That is, the distance measuring circuit 3 is activated and the object distance (distance information) that is the detection result is read. In step S3, an exposure control value (EV value: information related to subject brightness) is calculated based on the photometric information obtained in step S1 and the film sensitivity (read from the DX code of the loaded cartridge). Proceed to S4.

In step S4, it is determined whether the full-press switch SW2 is on or not. If it is affirmed, the process waits until it is negative, and if it is positive, the process advances to step S5 to take an image. That is, the photographic lens is driven to a predetermined focusing position based on the subject distance obtained in step S2, and the aperture value and shutter speed are determined from the program shown in FIG. 3 based on the EV value calculated in step S3. , accordingly, the exposure control circuit 5
Exposure is performed by driving the aperture and shutter through the . Also,
The EV value obtained in step S3 is the emission limit EV mentioned above.
If the value is below the value (EVL), a light emission signal is output in conjunction with shutter drive, and the electronic flash device is caused to emit light via the light emission control circuit 4.

Next, the process proceeds to step S6, and the E obtained in step S3 is
The V value (hereinafter referred to as the shooting EV value as it is used for exposure control during the shooting in step S5) is memorized, and this EV value is highly likely to cause camera shake in step S7. Range (Here, EVL~E
VL+IEV).

If step S7 is negative, the process is terminated, and if affirmative, in step S8, the flag F corresponding to the frame photographed in step S5 is set to rlJ, and the process is terminated. That is, in the control circuit 1, flags F are provided corresponding to each frame of one film, and all of these flags F are initially set to rOJ. and,
photograph. If the EV value is within the above range, the flag F corresponding to that piece is set to "1".In this embodiment, setting this flag F to rlJ is the process of assigning an identification signal. When all the frames for one film have been photographed, the user requests the lab to print this film.Then,
If you look at the finished print and decide that there is a lot of camera shake, operate the camera shake prevention button, and then press the switch SW.
When 3 is turned on, the program shown in FIG. 5 is started.

In FIG. 5, first, in step Sll, the above-mentioned flag F
is set to "1", and in step 812, the one corresponding to the retrieved frame is read out from the shooting EV values stored in step S6, and the process is performed in step S1.
Proceed to step 3.

In step S13, the maximum value (the brightest value) EVmax of the read out shooting EV values is selected, and then in step S14, this maximum value EVmax is set as a new light emission limit EV value (EVL) and the process ends. Let.
For example, if this maximum value EV+sax is EVIO, EVIO becomes the emission limit EV value (EVL) as shown by point A' in FIG.

According to the above procedure, when the switch SW3 is turned on, among the shooting EV values of each frame of one film shot in the past, the flag F is "1", that is, the range where there is a high possibility of camera shake ( EVt, ~EVL+IEV) is selected, and the emission limit EV value is changed to the maximum value EVmax of the selected EV values.

This changed emission limit EV value is the emission limit E before the change.
Since it is brighter than the V value, the frequency with which the electronic flash device fires will increase from the next shooting, increasing the possibility of preventing camera shake. Also, unlike changing the flash limit EV value to the high brightness side unnecessarily, it is changed within the range where camera shake is likely to occur (EVL" EVL + IEV) as described above, so unnecessary flashes of the electronic flash device will occur frequently. There is no power supply, and the consumption of the power battery can be suppressed.

In the structure of the above embodiment, the control circuit 1 is the storage means 1.
01, determination means 102, ri separate means 1o3, selection means 2
01 and the changing means 203, and the switch SW3 constitutes the operating member 202, respectively.

In addition, in the above, the light emission limit EV is set as a measure to prevent camera shake.
An example of changing the value to the bright side has been shown, but next, another example will be described in which the above-mentioned program diagram itself is changed.

That is, in the camera of this embodiment, as described above, when the shooting EV value is less than or equal to the predetermined emission limit EV value, the electronic flash device emits light, but when this emission limit EV value is exceeded, the shutter speed does not become less than the predetermined speed. The program diagram (this is the shooting condition) is determined as follows. This predetermined speed is called the camera shake limit speed and is expressed as TVt. When the switch SWI is turned on by pressing the release button halfway, the processes of steps 81 to S8 explained in FIG. 4 are performed. In other words, the shooting EV value at the time of shooting is stored, and if the shooting EV value is included in the range where camera shake is expected to occur, the flag F corresponding to that frame is set to "1".
It is said that

If you operate the anti-shake button after shooting one roll of film,
Switch SW3 is turned on and the program shown in Figure 6 is started. First, the processes in steps Sll to S13 (already explained in FIG. 5) are performed, and then in step S21, the shutter speed is determined from the program diagram in FIG. 3 based on the maximum value EVmax of the shooting EV values obtained in step S13. Find this shutter speed and set it as the new camera shake limit speed T V
Let it be t. If the photographing EV value is greater than or equal to the light emission limit EV value, the program is shifted so that the shutter speed does not become less than this camera shake limit speed T V L.

Since this new camera shake limit shutter speed TVL is faster than the camera shake limit shutter speed before the change, there is a greater possibility that camera shake will be prevented from the next shooting. Further, unlike the case where the camera shake limit speed TVL is increased unnecessarily as described above, the aperture is not opened unnecessarily and the depth of field is not sacrificed.

Furthermore, changing the emission limit EV value and shifting the program as described above may be combined. That is, for example, if the subject distance (detected by the distance measuring circuit 3) is within the flash range of the electronic flash device, the flash limit EV value is changed as explained in FIG. If the flash is outside the flash range, that is, if the subject is not sufficiently illuminated even if the electronic flash device fires, the flash limit EV
Since there is no point in changing the value (EVL), the camera shake limit shutter speed (TVL) is changed and the program is shifted as explained in FIG.

In the above, the emission limit EV value (EVL) or camera shake limit shutter speed (
Although the change value of TVL) is determined, it may also be determined from the shooting EV values of two or more films.

Further, at the time of shooting, the shooting EV value is stored, and if the shooting EV value is included in a predetermined range, the flag F is set to rlJ (processing in FIG. 4), and then the switch SW3
When the camera turns on, the photographing conditions are changed based on the flag F of rlJ among the stored photographing EV values (processing shown in FIG. 5), but the camera performs only the processing shown in FIG. The process shown in FIG. 5 may be performed by another device.

In other words, the camera can be connected to, for example, a personal computer (hereinafter referred to as a personal computer), and the stored photographic EV
It is assumed that the value and the state of flag F are transmitted to this personal computer. Based on the transmitted shooting EV value and the state of flag F, the personal computer determines the light emission limit EV value (EVL) using the processing procedure shown in FIG. 5 or 6 above, for example.
) or find the camera shake limit shutter speed (TVL),
The results are transmitted to the camera. As a result, the camera changes the current flash limit EV value (EVL) to the transmitted value, or changes the current camera shake limit shutter speed (TV) to the transmitted value, and changes the camera shake limit to this changed value. Shift the program so that the shutter speed does not drop below the shutter speed (TVL). This also provides the same effect as described above.

Furthermore, in the above, examples have been shown in which the emission limit EV value of the electronic flash device is changed to prevent camera shake, or the program is shifted so that the shutter speed does not fall below the camera shake limit value. This can also be done when changing the aperture value to prevent out-of-focus.

That is, consider a camera that has a photographing condition in which an aperture value (I shadow information) is determined from a predetermined program diagram based on the above-mentioned EV value, and photography is performed using this aperture value. The smaller the aperture value (opener), the narrower the depth of field and the more likely it is that out of focus will occur.

However, if you excessively increase the aperture value (stop down) to prevent out-of-focus images, the shutter speed will become slower, making it more likely that the above-mentioned camera shake will occur. Therefore, for example, the aperture value (photographing information) is memorized each time a photograph is taken, and it is determined whether or not this aperture value is within a range where defocus is likely to occur.
If it is affirmed, the flag F corresponding to that piece is set to "1".For example, when the above-mentioned switch SW3 is turned on,
The limit aperture value is determined from the aperture value of the frame whose flag is set to ``1'', and the program is shifted so that the aperture does not open wider than this limit aperture value during shooting. This makes it possible to prevent out-of-focus images without unnecessarily narrowing down the image.

G. Effects of the Invention According to the invention of claim 1, when it is determined that the stored photographic information satisfies or does not satisfy a predetermined condition, an identification mark is given to the piece. , if the stored photographing information and the presence or absence of the identification signal are transmitted to another device, and the photographing conditions are determined based on the photographing information of the piece to which the identification signal is attached and input into the camera,
Based on this, the camera changes the shooting conditions. Therefore, camera shake and out-of-focus can be prevented without causing problems due to excessive changes in photographing conditions.

Further, according to the invention of claim 2, the photographing information to which the identification signal is attached is selected, and the photographing conditions are changed based on the selected photographing information as the operating member is operated. A similar effect can be obtained.

[Brief explanation of drawings]

Figure 1 is a complaint correspondence diagram. 2 to 5 show an embodiment of the present invention, FIG. 2 is a block diagram showing a control system of a camera according to the present invention, FIG. 3 is a program diagram for exposure control, and FIG. FIG. 5 is a flowchart of the processing procedure, and FIG. 6 is a flowchart showing another embodiment. 61: Control circuit 2: 8 optical circuit 3: Distance measurement circuit 4: Light emission control circuit 5: Exposure control circuit

Claims (1)

[Scope of Claims] 1) A storage means for storing photographic information at the time of photographing, a determining means for determining whether or not the photographic information at the time of photographing satisfies a predetermined condition for each photographing of each frame; 1. A camera capable of changing photographing conditions, characterized in that the camera is equipped with an identification means for giving an identification signal to a frame when it is determined that the conditions are satisfied or not satisfied. 2) a storage means for storing photographic information at the time of photographing; a determining means for determining whether or not the photographic information at the time of photographing satisfies a predetermined condition for each photographing of each frame; If it is determined that the piece does not, an identification means for assigning an identification signal to the piece; a selection means for selecting information to which the identification signal has been assigned from the stored photographing information; and changing the photographing conditions. A camera capable of changing photographing conditions, comprising: an operating member that is operated to perform the operation; and a changing means that changes the photographing conditions based on the selected photographing information in accordance with the operation of the operating member. . 3) When the subject brightness is less than a predetermined light emission limit value, the shutter speed is maintained at a speed that does not cause camera shake, and
comprising an exposure control means for automatically causing an electronic flash device to emit light; the photographing information is information related to the subject brightness;
3. The camera according to claim 2, wherein said changing means changes said light emission limit value to a higher brightness side based on subject brightness related information selected by said selecting means.