JP2001142108A - Camera - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a camera which can always execute stroboscopic photographing intended by a photographer. SOLUTION: This camera is provided with shake detection means 18 and 33 detecting the shake of the camera, flash light emission means 17 and 40 emitting light toward an object and split dimming means 15, 16 and 41 multiply splitting a photographed picture into multiple pasts and receiving reflected light from the object by the emission means 17 and 40 for every region. Besides, it is provided with a change means changing the weighting of the dimming regions of the dimming means 15, 16 and 41 based on the shake information of the detection means 18 and 33.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a camera capable of performing multi-division dimming by a photometric sensor that divides a photographic screen into a plurality of areas and measures light.

[0002]

2. Description of the Related Art Conventionally, TTL light control in which a strobe light emitted from a strobe device and reflected by a subject is measured through a camera lens and a film surface, and when the measured light output reaches a predetermined value, the strobe emission is stopped. The device has been put to practical use.

There is also a photometric sensor that divides a photo screen into a plurality of areas and performs photometry, and a multi-segment dimming that includes a plurality of focus detection points and calculates each photometric value corresponding to the plurality of photometric points. Has been put to practical use.

However, in a camera with an automatic focusing device, the position where the photographer wants to focus does not always coincide with the position of the focus detection sensor in the photographing screen, and the composition is changed after focusing. Sometimes, even when a multi-division light control sensor is used, the exposure value often deviates significantly from the photographer's intention when the background is at a different distance from the subject.

Therefore, in Japanese Patent Laid-Open No. 9-33982, the composition is changed using each output of the divided photometric sensor when the lens reaches the in-focus position and each output of the divided photometric sensor immediately before photographing. It has been proposed to determine whether or not composition change has been performed, and to change the weight of each output of the divided photometric sensor or change the amount of strobe light emission.

[0006]

However, in Japanese Patent Application Laid-Open No. 9-33982, the composition change is determined from the output of the divided photometric sensor, and thus a luminance difference occurs in a plurality of photometric areas before and after the composition change. In this case, the composition change can be detected, but the direction and amount cannot be detected.
It is not known in which area the main subject exists.

Further, for example, even if the composition is changed when there is no difference in the contrast of the entire photographing screen, this cannot be detected, and accurate composition change determination cannot be performed. For this reason, if the composition is changed when there is a distance difference between the subject and the background even with the same contrast, poor dimming occurs.

Furthermore, scenes using a flash in the first place are generally dark in many cases, and in such a case, it is difficult to detect a luminance difference between a plurality of photometric areas.

An object of the invention according to the present application is to provide a camera which can always perform flash photography intended by a photographer.

[0010]

Means for achieving the object of the first invention according to the present invention include a shake detecting means for detecting a shake of a camera, a flash light emitting means for emitting light toward a subject, and a photographing means. A divided light control means for dividing the inside of the screen into multiple parts and receiving reflected light from the subject by the flash light emitting means for each area, wherein the divided light control means is based on shake information of the shake detection means. Characterized in that it has changing means for changing the weight of the dimming region.

As a configuration for realizing the object of the second invention according to the present application, the changing means is configured to control the divided tone based on shake information of the shake detecting means from an operation for preparation for photographing to an operation for starting photographing. It is characterized in that the weight of the dimming area of the light means is changed.

[0012] As a configuration for realizing the object of the third invention according to the present application, there is provided a discriminating means for discriminating whether or not a composition change has been performed based on shake information of the shake detecting means.
When the determining means determines that the composition has been changed,
The changing means changes the weight of the light control area of the divided light control means.

As a configuration for realizing the object of the fourth invention according to the present application, there are provided an integrating means for integrating an angular velocity signal of the shake detecting means to convert the angular velocity signal into an angle, and an angular velocity signal of the shake detecting means for determining a predetermined value. Calculating means for calculating a relative value of the angle information by the integrating means from when the value exceeds the value to when the value falls within a predetermined value.

According to the above-described configuration, the change in the composition of the camera can be determined by the shake detecting means, and the direction and the amount of the change in the composition can be accurately detected. Optimal weighting of the area
Accurate strobe light control becomes possible.

As a configuration for realizing the object of the fifth invention according to the present application, a shake detecting means for detecting a shake of a camera, a flash light emitting means for emitting light toward a subject, and a photographing screen divided into multiple parts are provided. And a divided light adjusting means for receiving the reflected light from the subject by the flash light emitting means for each area, wherein the shake detecting means has a panning detecting means of the camera, and It is characterized by having a changing means for changing the weight of the light control area of the divided light control means based on the detection information.

As a configuration for realizing the object of the sixth invention according to the present application, the panning detecting means converts the shake information by the shake detecting means into a camera shake angle via an integrating means and obtains the obtained information. When the angle information exceeds a predetermined angle, it is determined that panning of the camera has been performed.

A configuration for realizing the object of the seventh invention according to the present application is as follows. When the angle detected by the shake detecting means exceeds the first judgment value and falls between the second judgment value,
After the focus is locked, the camera is panned to determine that the composition has been changed, and when the second determination value is exceeded, it is determined that the subject has deviated from the shooting range or is following a moving subject. I do.

As a configuration for realizing the object of the eighth invention according to the present application, the first determination value and the second determination value are changed at least by a camera photographing parameter such as a focal length or a subject distance. It is characterized by the following.

According to the above configuration, the panning of the photographer is detected from the output of the shake detecting device, and when the panning is detected, the weight of the divided dimming means is changed, so that the main subject is exposed during flash photography. Dimming with an appropriate amount of light is possible without overexposure or underexposure.

[0020]

Embodiments of the present invention will be described below in detail with reference to the drawings. (First Embodiment) FIG. 1 is a schematic sectional view of a camera according to a first embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a photographing lens, 2 denotes a main mirror having an entire screen as a half mirror, 3 denotes a focusing screen, 4 denotes a penta roof prism, and 5 denotes a penta roof prism.
Is an eyepiece, and an object image passing through the photographing lens 1 is reflected upward by a main mirror 2 in the figure, and then formed on a focusing screen 3.
The photographer is configured to be able to observe a subject image formed on the focusing screen 3 by the eyepiece lens 5 and the penta roof prism 4.

Reference numeral 6 denotes a shutter curtain, and 7 denotes a film. The shutter curtain 6 is closed when a subject is observed.

Reference numeral 8 denotes a photometric lens, 9 denotes a photometric sensor, and the subject image formed on the focusing screen 3 is reflected by the penta roof prism 4 and
It is configured to re-image on the photometric sensor 9 through the photometric lens 8.

Numeral 10 denotes a total reflection sub-mirror, 11 denotes a field lens, 12 denotes an AF total reflection mirror, 13 denotes a secondary imaging lens, and 14 denotes a focus detection sensor. Is transmitted downward through the main mirror 2 and then reflected downward by the total reflection sub-mirror 10 into the field lens 11, the AF total reflection mirrors 12,
The light is guided onto the focus detection sensor 14 via the next imaging lens 13.

After the release, the main mirror 2 and the total reflection sub-mirror 10 move in the direction of the focusing screen 3 to retreat from the photographing optical path, and the subject image passing through the photographing lens 1 passes through the opened shutter curtain 6. It passes through and forms an image on the film 7.

Reference numeral 15 denotes a light control lens, reference numeral 16 denotes a divided light control sensor, and reference numeral 17 denotes a strobe. At the time of flash shooting, the subject reflected light from the strobe 17 passing through the photographing lens 1 forms an image on the film 7, The subject reflected light formed on the film 7 is divided by the light control lens 15 into the divided light control sensor 1.
6 to be re-imaged.

Reference numeral 18 denotes a shake sensor for detecting the shake of the camera, and the shake sensor 18 is also used for detecting panning of the camera.

FIG. 2 is a view of the finder of the camera according to the present embodiment.

In the figure, reference numeral 19 denotes a photographing screen frame, 20 denotes a focus detection mark, 21 denotes a main subject, 22 denotes a background,
FIG. 2A shows a state where the focus detection mark 20 is aligned with the main subject 21 and the focus is locked by half-pressing the release button. FIG. 2B shows that the camera is panned rightward in FIG. The state where the background 22 is framed in the photographing screen frame 19 together with the main subject 21 is shown.

FIG. 3 shows a dimming area of the divided dimming sensor of the camera shown in FIG. 1. In FIG. 3, the same components as those in FIG. 1 and FIG. I do.

As shown in FIG. 3, the divided light control sensor 16 is slightly smaller than the photographing screen frame 19,
The dimming area is divided into a central area 16C, a right area 16R, and a left area 16L.

The weighting of each dimming area is changed by the panning detection. When the photographing is performed in the state of FIG.
Is provided in the center area 16C, and the right area 16R
The dimming is performed with weighting approximately twice that of the left area 16L, and when panning rightward as shown in FIG. 2B, the left area 16L is larger than the center area 16C and the right area 16R. When dimming is performed with weighting of about twice and panning to the left is performed similarly, the right area 16R is weighted about twice as much as the center area 16C and the left area 16L to perform dimming. It is supposed to be done.

Next, the panning detection direction is shown in FIG.
It will be described based on.

The panning of the camera is detected by using an gyro such as a shake gyro as the shake detection means.
The signal is integrated in the camera microcomputer and converted into a camera shake angle, and when the obtained angle signal exceeds a predetermined angle, it is determined that the camera has been panned.

At this time, there are two kinds of judgments. When the detected angle exceeds the first judgment value and falls between the second judgment values, the camera is panned after the focus is locked to change the composition. When the value exceeds the second determination value, the camera is largely moved to determine that the subject is out of the shooting range or that the moving subject is being followed.

The first judgment value and the second judgment value are changed according to the photographing conditions of the camera, such as the focal length and the subject distance.

FIG. 4 shows the state shown in FIG.
FIG. 4A shows the output of the angle and the angular velocity applied to the camera when the camera is panned rightward as in the state shown in FIG. 4B. FIG. 4A shows the angular waveform, and FIG. 4B shows the angular velocity waveform. Is shown.

The shake detecting means comprises a pitch sensor for detecting a shake in the pitch direction of the camera and a yaw sensor for detecting a shake in the yaw direction of the camera. The angular velocity is in the state of the waveform 27 in FIG.

When this angular velocity is integrated by the camera microcomputer and converted into an angle, a waveform 24 shown in FIG. FIG.
In FIG. 4A, reference numeral 23 denotes an actual camera shake angle, reference numeral 25 denotes a first determination value of the camera shake angle, reference numeral 26 denotes a second determination value, and reference numeral 28 denotes a third determination value in FIG. is there.

Here, the camera shake angle waveform 24 deviates from the actual camera shake angle 23 from around time T1, and finally reaches an angle 0. This is because the shake gyro signal attenuates the DC component through the DC cut filter.

Therefore, not only the angular output but also the angular velocity output is used for the panning detection. When the angular velocity waveform 27 exceeds the third determination value, and when the angular waveform 24 exceeds the first determination value, the second waveform is used. Only when the value is equal to or less than the determination value, it is determined that the camera has been panned.

When the camera is panned to the left, the same judgment is made as above, and the waveform at that time is based on the state shown in FIG.

Also, when the camera is panned in the vertical direction, the pitch sensor can detect the same as above.

FIG. 5 is a block diagram showing an electrical configuration of the camera according to the present embodiment.

In the figure, 29 is a control circuit including a microcomputer for controlling the whole camera, 30 is a main switch of the camera, 31 is a SW1 switch which is turned on by the first stroke of half pressing the release button of the camera, 32 Is a SW2 switch that is turned on in the second stroke of the full press of the release button.

Reference numeral 33 denotes a shake detecting device for detecting a camera shake. The shake detecting device 33 includes a pitch sensor for detecting a camera shake in a pitch direction and a yaw sensor for detecting a camera yaw shake. It is constituted by a shake sensor 18, which detects camera shake of the photographer and sends camera shake information to the control circuit 29.

Reference numeral 34 denotes a photometric device for measuring the brightness of a subject by using the photometric lens 8 and the photometric sensor 9, and 35 denotes the sub mirror 10, the field lens 11, and the AF total reflection mirror 12.
A focus adjusting device that detects a focal position of a subject by a secondary imaging lens 13 and a focus detection sensor 14 and drives a focus lens in the photographing lens 1 in an optical axis direction to focus.

Reference numeral 36 denotes an image blur correction device for driving a correction mechanism for decentering a correction optical system in the photographing lens 1 based on shake information from the shake detection device 33 to suppress image blur,
37 is a mirror driving device for rotating the main mirror 2 and the sub mirror 10, 38 is provided in the taking lens 1,
An aperture driving device that drives the aperture to an aperture value determined based on photometric information from the photometric device 34;
This is a shutter drive device that opens and closes the shutter curtain 6 at a shutter speed determined based on photometric information from the camera to expose the film 7.

Reference numeral 40 denotes a strobe device comprising a strobe 17; 41, a light control lens 15 and a divided light control sensor 16; The photometer is divided into two areas, and the dimming device 42 changes the weight of each area when panning is detected based on the shake information from the shake detection device 33. The motor 42 sends the film 7 to the next frame. Or a film feeder for rewinding the film 7 after all frames have been shot.

Next, a part of the operation of the camera according to the present embodiment having the above configuration will be described with reference to the flowchart of FIG.

When the main switch 30 is turned on, first, in step # 101, the SW1 switch 31 enters a standby state. If it is detected that the SW1 switch 31 has been turned on, the process proceeds to step # 102, and the detection of the camera shake is started by the shake detection device 33. In the next step # 103, the brightness of the subject is measured by the photometric device. In the following step # 104, the focus position of the subject is detected by the focus detection device 35, and the focus lens in the photographing lens 1 is driven in the optical axis direction to focus.

In step # 105, the drive of the correction mechanism for decentering the correction optical system in the photographing lens 1 based on the shake information from the shake detection device 33 is started.

Next, in step # 106, the state of the SW1 switch 31 is determined again. If the SW1 switch 31 is off, the process returns to step # 101. Therefore, when reframing without taking a picture, it is sufficient to once release the finger from the release button to turn off the SW1 switch 31 and repeat the operation from step # 101 again.

On the other hand, at step # 106,
If the first switch 31 is on, the process proceeds to step # 107, where the state of the SW2 switch 32 is determined. If the first switch 31 is off, the process returns to step # 106. If the SW2 switch 32 is turned on by fully pressing the release button, the process proceeds to step # 108, and it is determined whether or not the composition has been changed. If it is determined that the composition has been changed, the process proceeds to step # 109, the weight of the light control area of the divided light control sensor 16 is changed, and the process proceeds to step # 110.
On the other hand, if it is determined that there is no composition change, the process proceeds to step 110 without changing the weight of the dimming area.

In step # 110, the main mirror 2 and the sub-mirror 10 are rotated by the mirror driving device 37 so as to be retracted out of the photographing optical path.

In the next step # 111, the aperture driving device 38 drives the aperture to an aperture value determined based on the photometric information obtained in step # 103.

In the following step # 112, the shutter drive unit 39 opens and drives the shutter curtain 6 to start exposure of the film 7.

In the following step # 113, the emission of the strobe light 17 is started by the strobe device 40, and when the photometric output of the divided light control sensor 16 reaches a predetermined value by the divided light control device 41, the strobe light emission is stopped.

In the subsequent step # 114, the shutter curtain opened by the shutter driving device 39 in the above-mentioned step # 112 so as to have the shutter speed determined based on the photometric information obtained in the above-mentioned step # 103. 6 is driven closed.

In the following step # 115, the aperture driven to be stopped down in step # 111 is returned to the open state by the aperture driving device 38.

In the following step # 116, the driving of the correction optical system started in step # 105 is stopped.

In the following step # 117, the shake detection started in step # 102 is stopped.

In the following step # 118, the main mirror 2 and the sub-mirror 10, which have been retracted out of the photographing optical path in the above-mentioned step # 110, are returned to the original positions by the mirror driving device 37.

In the following step # 119, the film 7 is wound up to the next frame by the film feeder 42, and the process is terminated.

As described above, the panning of the photographer is detected from the output of the shake detecting device 33, and when the panning is detected, the weight of the divided light control sensor 16 is changed, so that the main subject is exposed during flash photography. Dimming with an appropriate amount of light is possible without overexposure or underexposure.

In the above embodiment, an example in which the present invention is applied to a single-lens reflex camera is described. However, the present invention is also applicable to a compact camera. In addition, although an example has been described in which the number of divided areas of the divided light control sensor is divided into three on the left and right, the number is not limited to this, and for example, it may be divided into six parts vertically, horizontally, and horizontally.

[0067]

According to the first to fourth aspects of the present invention, the change in the composition of the camera can be determined by the shake detecting means, and the direction and amount of the change in the composition can be accurately detected. , The optimal weighting of the divided light control area is performed, and accurate flash light control is possible.

According to the present invention, the panning of the photographer is detected from the output of the shake detecting means, and when the panning is detected, the weight of the divided dimming means is changed, so that the flash photographing is performed. Occasionally, the main subject will not be overexposed or underexposed, and light control with an appropriate amount of light can be performed.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a camera according to a first embodiment of the present invention.

FIG. 2 is a viewfinder view of a camera according to the first embodiment of the present invention;

FIG. 3 is a diagram showing a dimming area of a divided dimming sensor of the camera of FIG. 1;

FIG. 4 is a diagram showing outputs of angles and angular velocities applied to a camera during panning.

FIG. 5 is a block diagram showing an electric configuration of the camera according to the first embodiment of the present invention;

FIG. 6 is a flowchart showing a part of the operation of the camera according to the first embodiment of the present invention;

[Explanation of symbols]

15 Dimming lens 16 Divided dimming lens 17 Strobe 18 Shake sensor 23 Actual camera shake angle 24 Shake angle waveform obtained by integrating the output of the shake sensor 25 First camera shake angle determination value 26: second determination value of camera shake angle 27: shake angular velocity waveform by shake sensor 28: third determination value of camera shake angle

Claims (8)

[Claims] 1. A shake detecting means for detecting a shake of a camera, a flash light emitting means for emitting light toward a subject, and a photographing screen divided into a plurality of sections to reflect light from the subject by the flash light emitting means for each area. And a changing means for changing a weight of a light control area of the divided light controlling means based on shake information of the shake detecting means. 2. The method according to claim 1, wherein the changing unit changes the weight of the dimming area of the divided dimming unit based on shake information of the shake detecting unit after an operation of preparation for shooting until an operation of starting shooting. 2. The camera according to claim 1, wherein A determination unit configured to determine whether a composition change has been performed based on shake information of the shake detection unit;
When the determining means determines that the composition has been changed,
3. The camera according to claim 1, wherein the changing unit changes a weight of a light control area of the divided light control unit. 4. An integrating means for integrating an angular velocity signal of said shake detecting means to convert the angular velocity signal into an angle, and said integration during a period from when the angular velocity signal of said shake detecting means exceeds a predetermined value to within a predetermined value. 4. A camera according to claim 3, further comprising a calculating means for calculating a relative value of the angle information by said means. 5. A shake detecting means for detecting a shake of a camera, a flash light emitting means for emitting light toward the subject, and dividing a photographing screen into a plurality of areas and reflecting light from the subject by the flash light emitting means for each area. Wherein the shake detection means has panning detection means for the camera, and the light control area of the division light control means is determined based on information detected by the panning detection means. A camera comprising changing means for changing weighting. 6. The panning detection means converts the shake information from the shake detection means into a camera shake angle via an integration means, and determines that the camera has been panned when the obtained angle information exceeds a predetermined angle. 6. The camera according to claim 5, wherein the determination is made. 7. When the angle detected by the shake detecting means exceeds a first determination value and falls between a second determination value,
After the focus is locked, the camera is panned to determine that the composition has been changed, and when the second determination value is exceeded, it is determined that the subject has deviated from the shooting range or is following a moving subject. 7. The camera according to claim 5, wherein 8. The camera according to claim 7, wherein the first determination value and the second determination value are changed at least by a photographing parameter of the camera such as a focal length or a subject distance.