JP2003337359A - Camera with camera shake detecting function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a camera with a camera shake detecting function realizing, with a more accurate and simpler constitution than in the conventional manner at low cost, a camera shake detecting function with which a clear picture hardly influenced by camera shake is taken by holding the camera while viewing check display that the camera shake is detected and even when a user who does not pay attention to the camera shake uses the camera. <P>SOLUTION: A camera with the camera shake detecting function 10 is equipped with: an LCD 6 including an LCD 6a provided within a finder and displaying information concerning picture taking; and a vibration detecting means (light receiving lens 5d and sensor array 5c or the like) suggesting the occurrence of the camera shake of a camera main body 10A by concurrently using a monolithic accelerometer (acceleration IC) 3 in addition to a range-finding sensor (AF part 5a) functioning as a camera shake deciding means. The transmissivity of the display area of the LCD 6a within the finder is changed in terms of pattern so that the user can easily recognize the occurrence of the camera shake. When a CPU 1 compares subject image data outputted from an AF part 5a at specified time intervals and detects the camera shake according to the image deviation of the subject image data, the use range of the subject image data is made different from the range at the time of range-finding. <P>COPYRIGHT: (C)2004,JPO

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 with a camera shake detection function, which is equipped with a camera shake prevention technology for detecting camera shake generated during shooting with a camera and warning the photographer.

[0002]

2. Description of the Related Art In general, when taking a picture while holding the camera by hand, if the camera shakes during exposure when the shutter speed is slow, a photograph often fails. That is, this is due to the occurrence of camera shake.

Therefore, in order to prevent this camera shake, various anti-vibration techniques have been conventionally studied in cameras.

Such anti-vibration technology is generally classified into two technologies, that is, a technology for detecting the vibration of the camera body and a technology for preventing the vibration to be detected. Further, the technology relating to vibration countermeasures is further classified into a warning technology for making a user aware of the vibration state of the camera body and a correction technology for driving and controlling the photographing lens to prevent image deterioration due to camera shake.

As the above-mentioned warning technique among the above-mentioned image stabilization techniques, the applicant of the present invention has proposed a camera resistant to camera shake by devising a display means in, for example, Japanese Patent Application No. 11-20145.

Further, an example in which a distance measuring sensor is applied is also disclosed in Japanese Patent Laid-Open No.
No. 001-165622 gazette, or Japanese Examined Japanese Patent Publication No. 62-2
It is disclosed in Japanese Patent No. 7686.

As described above, conventionally, the above-described image stabilization technique is adopted to take a photograph in an optimum state without the influence of camera shake as much as possible so that a beautiful photograph can be obtained.

[0008]

However, in the conventional camera equipped with the above-mentioned image stabilization technology, general users do not even know what kind of camera shake is, and do not recognize the necessity of preventing camera shake. There are people who press the release button deeply to take a failed photo, especially when they let go of the camera and ask for a release operation to take a picture of themselves on a trip etc. As shown in FIG. 6 (a), the camera 10 was largely moved to hold the image, which often ruined the photograph.

Further, since the range of use of the measured object image data is not taken into consideration in the case where distance measurement is performed using a distance measurement sensor (AF sensor) and the case where blur detection is performed, There is also a problem that optimum processing cannot be performed and sufficient performance cannot be obtained.

Therefore, the present invention has been made in view of the above problems. Even if a user who does not pay attention to camera shake is used, the user can hold the camera while watching the check display for detecting and displaying camera shake. An object of the present invention is to provide a camera with a camera shake detection function, which can realize a camera shake detection function that enables taking a beautiful photograph with less influence of camera shake with higher accuracy and a simpler structure than ever before, and at low cost.

The present invention also relates to a camera with a camera shake detection function capable of performing higher-performance distance measurement and camera shake detection in consideration of the usage range of measured object image data according to the application of the AF sensor. For other purposes.

[0012]

According to a first aspect of the present invention, there is provided a camera with a camera shake detection function, which has a camera shake detection function for detecting a camera shake using an AF sensor of the camera for detecting a vibration state of a camera body. In the camera, the subject image data output from the AF sensor is compared at predetermined time intervals, and when the camera shake detection is performed based on the image shift amount of the subject image data, the range of use of the subject image data is measured. It is characterized in that the range is different from time.

According to a second aspect of the present invention, there is provided a camera with a camera shake detection function according to the first aspect of the present invention, in which the range of use of a subject image when performing camera shake detection is:
It is characterized in that it is wider than during distance measurement. A camera with a camera shake detection function according to a third aspect of the present invention is the camera with a camera shake detection function according to the first aspect, wherein the range of use of the subject image data is determined according to the focal lengths of the taking lens and the taking lens during distance measurement. It is characterized in that the use range of the subject image data is made constant regardless of the focal length of the photographing lens when switching and camera shake detection.

According to a fourth aspect of the present invention, there is provided a camera with a camera shake detection function in the camera with a camera shake detection function according to any one of the first to third aspects.
It is characterized in that the display means provided in the camera displays the occurrence of camera shake to warn the user.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. First Embodiment: A camera with a camera shake detection function according to an embodiment of the present invention is a liquid crystal that displays a shooting range (viewfinder field) according to a shooting mode provided in a viewfinder of a camera by a change in light transmittance. In addition to the above-mentioned distance measuring sensor as the camera shake determination for the camera shake determination, a monolithic accelerometer is used in combination, and a vibration detecting means for detecting camera vibration and suggesting the occurrence of camera shake is provided, and camera shake has occurred. In this case, a technique is adopted in which the transmittance of the display area of the liquid crystal display means is changed in a pattern to allow the user to easily recognize the occurrence of camera shake.

The monolithic accelerometer, which is formed in the form of an IC chip, is a device for detecting vibrations by utilizing a capacitance change generated between a movable pattern and a movable pattern. For example, Japanese Patent Laid-Open No. 8-17
The one proposed in Japanese Patent No. 8954 can be used. Both patterns are formed of a polysilicon member on a silicon substrate, and one electrode is movable and responds to acceleration, while the other electrode is stationary with respect to acceleration. It forms a pair of capacitors. When acceleration is applied to such a silicon substrate, the capacitance of one capacitor increases and the capacitance of the other capacitor decreases. A signal processing circuit for converting these differential capacitances into a voltage signal is required, and these movable electrodes, capacitors and signal processing circuits are formed monolithically on the same substrate.

Further, Japanese Patent Application Laid-Open No. 8-178954 describes an application technique for operating a safety device such as a control system of an automobile or an air bag. Although it has been described that the power and reliability are excellent, the present invention
By effectively arranging and controlling such elements and maintaining the above characteristics, the situation peculiar to the camera is added and a highly accurate and effective image stabilizing camera is realized. This portion may be configured by a shock sensor or the like that detects a shock or the like.

1 and 2 show an example of the configuration of a camera with a camera shake detection function according to the first embodiment of the present invention. FIG. 1A shows an external configuration of a camera with a camera shake detection function according to the present embodiment, and is a perspective view showing the internal structure with a part broken away. FIG. 1B shows the camera according to the present embodiment. FIG. 1 is a configuration diagram showing an arrangement relationship between a hard printed circuit board and a flexible printed circuit board (hereinafter referred to as a flexible printed circuit board) adopted in FIG. 1, and FIG. 1C is an explanatory view showing a distance measuring optical system of the camera of the present embodiment. . FIG. 2 is a block diagram showing an electrical block configuration of the camera of this embodiment. As shown in FIG. 1A, the camera 1 of the present embodiment
0 is configured as a seed in the camera body 10A. On the front surface of the camera body 10A, in addition to the taking lens 9 and the strobe 8,
A finder objective lens 15, a light receiving lens of a distance measuring unit for autofocus, and the like are arranged. This camera body 1
An electronic circuit group for fully automatic operation of the camera 10 is provided inside the 0A. This electronic circuit group also includes the above-described monolithic accelerometer (acceleration IC) 3 mounted on the hard printed board 14, and in order to show the positional relationship, a part of the internal structure is shown in FIG. It is broken as you can see.

In addition to the acceleration IC 3, on the hard printed board 14, a one-chip microcomputer (CP) as a control means for controlling the operation relating to the photographing of the entire camera is also provided.
U) 1 or an interface IC (IFIC) that drives a mechanical mechanism unit by operating an actuator such as a motor
2 is implemented. Further, in the vicinity of the CPU 1, for example, an EEPROM is provided as a memory 4 for storing adjustment data for component variations in the camera assembly process.

FIG. 1B is a diagram showing the relationship between the rigid printed board 14 and the flexible board 7 when the camera is viewed from the lateral direction. As shown in FIG. 1B, the rigid printed circuit board 14 is not bent along the curved surface inside the camera, so that the flexible printed circuit board 7 is used and is connected by the connector 12.

A display element (LC
D) 6 (see FIG. 1A) is mounted, and a communication line with the autofocus (AF) sensor 5 and a switch pattern 13 are formed. The flexible board 7 wraps around to the back surface of the camera body 10A, and an announcement element such as a sounding element PCV or an LED in the warning display section 11 as shown in FIG. 1B is mounted, and the warning display section 11 outputs from the CPU 1. In addition to transmitting the generated signal, the AF sensor 5c is also capable of transmitting and receiving the signal.

As shown in FIG. 1C, the AF sensor 5 obtains the distance of the object 101 by using the principle of the triangular distance. The image signal 102 of the object 101 is transferred to the two light receiving lenses 5d and 5d. Detected by the sensor array 5c,
The subject distance can be detected from the relative position difference X.

In this case, since the subject generally has a vertical shadow, the two light-receiving lenses 5d are arranged as shown in FIG.
The sensor array 5c is divided in the horizontal direction (X direction) as shown in FIG. With this arrangement, an image shift in the X direction caused by a camera shake in the lateral direction can be detected by this depth.

Therefore, the acceleration IC 3 is as shown in FIG.
As shown in FIG. 7, the sensors are arranged in the Y-direction rather than the X-direction so as to detect blurring, and the detection in both the X and Y directions is complemented by separate sensors.

The acceleration IC 3 will be described in more detail with reference to FIGS. 3 and 4.

FIG. 3 is an explanatory view showing an example of the manufacturing process of the acceleration IC 3, and FIGS. 3 (a) to 3 (e) correspond to the manufacturing process sequence (first to fifth processes). is there.
4 shows a specific structure of the acceleration IC 3, FIG. 4 (a) is a structural diagram on a silicon substrate, and FIG. 4 (b).
FIG. 4 is a perspective view showing a configuration of a silicon substrate including movable electrodes and arms, and FIG. 4C is a configuration diagram showing an IC configuration including a processing circuit formed on the silicon substrate.

First, an oxide film 21 is formed on a silicon substrate (IC chip) 20 (see FIGS. 3A and 3B), and a pattern is formed on the oxide film 21 by a resist mask to expose it. The part that is being etched is removed by etching,
When a resist mask is used, an opening can be formed in an arbitrary portion (see FIG. 3C).

After that, after depositing a polysilicon layer 22 on the surface (see FIG. 3D), the oxide film 21 is selectively removed by wet etching, whereby the polysilicon layer 22 has a bridge-like structure. Then, it is formed on the silicon substrate 20 (see FIG. 3E). Impurities such as phosphorus are diffused into the polysilicon layer to make it conductive.
Due to this type of bridge structure, the movable electrode 22 having pillars at four corners as shown in FIG. 4B or the silicon substrate 20 is formed.

Also, on the silicon substrate 20, FIG.
As shown in (a), separate electrodes 24 and 25 are formed and arranged adjacent to the arm portions 23a and 23b of the movable electrode 22 described above, whereby the arm portion 23a, the electrode 24, and the arm portion 23 are formed.
A small capacitor capacitance is formed between b and the electrode 25.
Further, as shown in FIG. 4C, an IC chip having this movable electrode structure arranged on the silicon substrate 20 can be used as a monolithic IC with a processing circuit capable of determining acceleration in a predetermined direction.

That is, as shown in FIG. 4 (c), the processing circuit 29 is formed on the chip together with the movable electrode capacitor composed of the monolithic structure on this chip. This is to detect the amount of capacitance changed by the movable electrode 22 and output a signal corresponding to the acceleration. Due to the movement of the bridge-shaped movable electrode 22, one of the capacitances formed in the two electrodes increases and one force decreases,
The acceleration in the arrow direction in FIG. 4B can be detected.

Therefore, when the IC chip having such a structure is mounted on the camera, the acceleration in the Y direction can be determined as shown in FIG. 2 (b).

FIG. 5 (a) is a block diagram showing a configuration example of the processing circuit 29.

As described above, a capacitance component is formed between the arm portions 23a and 23b included in the Y sensor 31 for detecting the movement in the Y direction and the electrodes 24 and 25, respectively. The movement of 23b changes these capacities. This capacitance change is converted into an electric signal by the processing circuit 29.

As shown in FIG. 5A, the processing circuit 29 includes a carrier wave generator (oscillation circuit) 32 that oscillates a carrier wave having a pulse waveform, and the respective oscillations that are changed by the capacitance change of the Y-direction acceleration sensor 31. A demodulation circuit 34 for demodulating the waveform by full-wave switching rectification, a filter circuit 36 for outputting an acceleration-dependent analog signal, and an analog-
It is configured as a PWM signal generation circuit 37 that performs PWM conversion.

FIG. 5B shows an output waveform of the processing circuit 29. As shown in this figure, the output of the processing circuit 29 is the duty ratio of the pulse (T
The ratio of 1 to T2) changes.

Therefore, the acceleration IC 3 outputs a voltage signal proportional to the acceleration or a pulse width modulation (PWM) signal proportional to the acceleration. The CPU 1 that can handle only digital signals can detect acceleration by demodulating a PWM signal using a built-in counter. For the voltage signal proportional to the acceleration, a regulator having an A / D converter may be used. If the PWM signal is used, the CPU 1
It is not necessary to mount an A / D converter on.

FIG. 2A shows a block circuit diagram of a camera in which such an acceleration IC 3 is mounted, and the configuration of the main components will be described with reference to this figure.

The electric circuit configuration of the camera 10 of the present embodiment is, as shown in FIG. 2A, a CPU 1 for controlling the entire camera, an IFIC 2, a monolithic accelerometer (acceleration IC) 3, and , A memory (EEPROM) 4 for storing adjustment data, an autofocus (AF) section 5a, a photometric section 5b, a liquid crystal display element (LCD) 6 for displaying information on the setting state and shooting of the camera,
An in-viewfinder LCD 6a provided in the finder for displaying information related to shooting, a strobe unit 8 including an arc tube for emitting auxiliary light, a main capacitor 8a for charging electric charges for causing the arc tube to emit light, and a zooming function. , A warning display unit 11 including an LED, and a resistor 11a connected in series to the warning display unit 11.
Switches 13a and 13b for starting a photographing sequence of the camera, a motor 18 for driving a photographing lens 9, a shutter 19, a drive mechanism such as film feeding, and a rotary blade 16 rotating in conjunction with the motor 18. , Motor 18
And a photo interrupter 17 that optically detects the hole of the rotating blade 16 that rotates for drive control.

Further, the motor 18 may switch the driving destination by a switching mechanism (not shown) when driving each driving mechanism such as the photographing lens 9 and the shutter 19, or each driving mechanism is provided with another motor. Good.

In such a configuration, the CPU 1 controls the camera 1 based on the operation states of the switches 13a and 13b.
The shooting sequence of 0 is executed and controlled. That is, based on the output of the monolithic accelerometer 3, in addition to the warning display by the in-view LCD 6a for camera shake warning, the distance measuring section 5a for autofocus at the time of shooting, and the photometric circuit 5b for measuring the brightness of the subject for exposure control. To drive the motor 18 via the IFIC2 described above by receiving the necessary signal.
Drive control.

At this time, the rotation of the motor 18 depends on the rotation of the rotary blade 1.
6, the IFIC 2 waveform-shapes the signal output from the photo interrupter 17 according to the position of the presence or absence of the adjustment hole, and supplies the signal to the CPU 1. The CPU 1 receives the signal and monitors the rotation state of the motor 18. Further, the CPU 1 causes the strobe unit 8 to emit auxiliary light as needed. Further, the CPU 1 reads the focal length state of the photographing lens from the focal length detection unit 101 in order to set the distance measuring visual field range.

FIG. 13 shows an example of a warning pattern displayed on the LCD 6a in the finder, where the code A is the screen A of the A pattern, the code B is the screen B of the B pattern, and the code C is the screen C of the C pattern. Is shown.

As the in-viewfinder LCD 6a, the one used for the screen display in the panorama mode, the frac-out display indicating that the shutter is released, or the like is diverted.

The patterns A and C shown in FIG. 13 use a light-shielding pattern displayed in the panoramic shooting setting. First, as shown in screen A, only the upper region is shielded from light, and then screen B is displayed. As shown in the figure, it is a pattern in which light is shielded only in the medium fire area indicating the shooting range during panorama shooting, and finally, light is shielded only in the lower area of the panorama light shielded area as shown in screen C. By repeating this display form, the user looking into the finder can be made aware of the occurrence of camera shake. The blackout display can be performed by simultaneously shielding the patterns A, B, and C from light.

With such a display, it is possible to express a feeling that the viewfinder screen is swaying.
If the camera shakes again after re-holding the camera, the screen returns to the screen D shown in FIG. 14A or the screen E shown in FIG. 14B according to the normal or panorama mode, and the subject can be monitored.

FIG. 15 is a diagram showing a display example (pattern 1) of the camera shake warning displayed on the in-viewfinder LCD 6a.

As shown in FIG. 15, this pattern 1 is
Similar to the pattern described in FIG. 13, the light-shielding portion displayed when the panoramic shooting is set is used. In this pattern, the upper and lower light-shielding portions are alternately displayed as screen A and screen C. This pattern is different from the warning pattern in FIG. 13 in that the central portion of the screen is always visible, so that the facial expression of the subject does not become difficult to see in the panoramic shooting mode. In addition, since it blinks,
Unlike the normal display in (a) and FIG. 14 (b), there is no misunderstanding by the user, and the user can be surely notified using the warning display.

Next, the vibration detection principle of the camera having such a configuration will be described in detail with reference to FIGS. 6 to 11.

6A and 6B are explanatory views for explaining a vibration operation when the camera shake occurs, FIG. 6A shows a state when the user holds the camera, and FIG. 6B shows a vibration of the camera. It is a figure which shows a detection direction. FIG. 7 is a characteristic diagram showing time-acceleration characteristics according to the moving distance of the camera,
FIG. 7A shows a case where the movement amount of the camera is large, and FIG.
Indicates the case where the movement amount of the camera is small.
FIG. 8 is an explanatory diagram for explaining the vibration detection operation of the camera of the present embodiment, and FIGS.
The operating procedures and display examples are shown in FIG. Further, FIG. 9 is a configuration diagram showing a configuration of display segments in the LCD of the camera, FIGS. 10 and 11 are external views showing a warning display state of the camera, and FIG. FIG. 11 is a perspective view seen from the rear side of the camera in the operated state, and FIG. 11 is a perspective view seen from the front side of the camera with the self-timer LED blinking. Now, it is assumed that the user uses a camera to perform shooting. In this case, the user 100 may hold the camera 10 with one hand as shown in FIG. 6A. In such a case, the camera 10 tends to slightly vibrate in an oblique direction. That is, such a minute vibration of the camera 10 can be decomposed into movements in the X direction and the Y direction, as shown in FIG.

In general, the general user is often unconscious of such a slight vibration or the effect of “blurring” at the time of shooting, and in response to this, in the camera 10 of the present embodiment, the camera 10 is By detecting this minute vibration and performing the display as described in FIG. 13,
Since the user 100 takes a picture by taking measures to suppress vibration such as attaching the left hand 100a to the camera, it is possible to take a picture without failure due to camera shake.

However, since a high-class user who is annoyed by the constant warning, and who is worried about camera shake, may enjoy taking pictures using camera shake effectively, this implementation In this mode, the holding check function is set as one of the shooting modes, and the holding check function is improved so that it can be set only when the user thinks it is necessary. That is, the switch 1 as shown in FIG.
3c and the liquid crystal display unit 6 are provided, and only the functions of the film counter 6a and the like are activated in the normal state, and only when the user 100 operates the mode selector switch 13c with the left hand 100a or the like as shown in FIG. 8B. , The camera shake mode is set, and when this mode is set, FIG.
As shown in FIG. 8C, when the display segments 6b and 6c are displayed and the display segment 6b blinks, the user can recognize that the holding check mode has been entered.

Further, in this embodiment, as shown in FIG. 8D, this mode display also serves as part of the self-timer mode display, so that the layout in the liquid crystal display (LCD) 6 is There is no burden. In addition, as shown in FIG. 9, each of the display segments 6b,
Since the 6c are wired in the liquid crystal display section 6 so as to be independent of each other, the independent display control by the CPU 1 is possible.

Setting this mode and holding the camera 10,
If the holding check is unstable, the LCD 6a in the finder flickers as described above and the user 10
0 may be used as a warning, and as shown in FIG. 10, the LED 11 near the finder eyepiece 61 of the camera 10 may be blinked to give a warning.

In this case, when viewed from the front, the camera 10
The external appearance may be as shown in FIG. 11, and the self-timer display LED 65 may be made to blink so that when the owner of the camera 10 asks another person to take a picture, the holding of the photographer can be checked. .

Next, the difference between the output of the AF sensor (image signal) and the output of the acceleration sensor, which is a feature of the present invention, will be described in detail with reference to FIG.

Now, for example, by holding the camera 10 by the user 100, as shown in FIGS.
As shown in (b), it is assumed that the camera 10 itself causes camera shake having movements in both X and Y direction components.

In this case, in the camera 10 of the present embodiment, the moment the camera 10 moves as shown in FIG.
Acceleration sensor (acceleration IC) 3 at the timing of t = t1
Outputs a signal when the camera 10 starts moving, but if the camera 10 is moving at a constant speed thereafter, the acceleration sensor 3 does not output a signal because the acceleration is not acceleration despite the camera shake. Again, when the camera stops, t = t7
At this timing, the acceleration sensor 3 outputs in such a direction as to stop the previous constant velocity motion.

To supplement this acceleration sensor, the image sensor (AF sensor) of the camera outputs an image signal that keeps changing during constant velocity motion. Therefore, if this output is judged, the output of the acceleration sensor 3 is zero. The CPU 1 of the camera 10 can determine that the camera 10 is moving.

In addition, as shown in FIG. 7B, the acceleration sensor 3 may output an output even if the image signal hardly changes. This is the state in which the user 100 is trying to fix and hold the camera 10 while shaking, as shown in FIG.
Unlike the state shown in (1), the change in the image is small, and in fact, there are many cases in which it is possible to take a good picture depending on the focal length even if this is taken. That is, even if the acceleration sensor 3 outputs a large output, the camera 10 may only be slightly moving, and even if the acceleration sensor 3 reacts only occasionally,
The camera position may change greatly.

Further, there are some limits to the blur determination by the AF sensor. For example, in a scene where there is no contrast or a scene where the image is dark and the image cannot be seen, the determination cannot be made because the change in the image is not known. Further, as in the present embodiment, the sensor having only one detection direction cannot recognize the movement or image change of the camera 10 having a different force direction, and when the camera 10 shakes too much, the AF sensor The position monitored by will be displaced and the image will change completely, making it impossible to accurately determine the amount of blur.

Therefore, it is necessary to properly use these two sensors properly to judge the blur. The camera according to the present embodiment has a holding check mode function in which a sensor based on such two detection methods is mounted.

The display control and the like performed by the CPU 1 in the camera with the holding check mode function according to the sequence according to the built-in program will be described in detail with reference to the flowchart shown in FIG.

For example, in the camera 10 shown in FIG. 11, when the barrier 10a for protecting the front lens is opened,
The user first carries out the framing, the holding operation has not been started yet, and the camera 10 is largely moved. Therefore, the determination by the AF sensor is not effective. Since the AF sensor monitors only a narrow part of the screen, a large camera movement cannot be evaluated quantitatively at all.

Therefore, the CPU 1 in the camera 10
By the determination process of step S1, first, the output of the acceleration sensor 3 is determined, and even if there is a shock when the barrier is opened or when the user holds the camera, a holding warning is given for a predetermined time by the process of step S2. Is prohibited, and thereafter the image detection using the AF sensor is performed in the determination processing of step S3. As a result, it is determined whether the image detection is suitable for the holding check. Therefore, when the CPU 1 determines in step S4 that the detected image has low brightness and in step S5 that it is a low contrast, it does not use the image signal. , The process shifts to step S10 so as to activate the blur determination flow based on the acceleration detection. This is to issue a warning when the acceleration sensor outputs a signal and when it is not detected that the reverse acceleration is output for a predetermined time (steps S11 to S12) (step S13), FIG. 7 (a). As shown in, it is determined that the camera continues to move at a constant speed,
It informs the user that camera shake may occur.

In this state, the user may intend to follow the shot, so that, for example, the LCD in the viewfinder does not blink (FIG. 13, etc.), and the LED 11 near the viewfinder eyepiece as shown in FIG. Alternatively, the warning may be different from that when the AF sensor is also used (step S27).

If the image signal is suitable for camera shake determination, the CPU 1 sets the object image data range used for blur detection in the flow after step S20 (step S).
20), the image detection is performed at predetermined time intervals (step S2
3) Repeatedly (steps S22 and S25), after that, when there is a difference of a predetermined level Xc or more between the signals,
Judgment is made in the judgment processing of step S26, and step S27
The display is controlled so as to give a warning that the holding is insufficient in the processing of.

With these warnings, the user recognizes that he / she is unconsciously causing camera shake, and can take measures to prevent camera shake by holding with both hands or placing it on something.

When the CPU 1 determines in the determination process of step S28 that the signal difference is larger than Xcc which is larger than Xc obtained in step S26, the CPU 1 determines that the user has no problem. Since it is assumed that another angle is taken or the composition is changed, the process is returned to step S1. This step S2
If the result of the determination in step 8 is not, the process proceeds to step S
The process is returned to step 23.

On the other hand, when the image signal is stable, C
The PU1 determines that the signal difference is Xc by the determination in step S26.
Since it is smaller, it is determined in the determination process of the subsequent step S29 that the release button has been pressed, and if it is determined that the release button has been pressed, the exposure sequence from the subsequent step S30 is executed, and if it is determined that the release button has not been pressed. , And returns the process to step S23.

When the release is pressed, the CPU 1
First, the focal length f of the taking lens is detected in the process of step S30, and it is determined in the subsequent determination process of step S31 whether the focal length f is smaller than a predetermined value f0. In this case, if it is determined to be small, the process is continued to step S32, and if it is determined to be large, the process is performed to step S33 and thereafter. That is, step S
In the process of 32, a wide distance measuring region is set, and in the process of step S33, a tele distance measuring region is set. That is, in each process, the range of the subject image data for wide distance measurement and the range of the subject image data for tele distance measurement are set.

Subsequently, the CPU 1 carries out the following step S3.
4. In the process of step S35, the focusing and the distance measurement for that are performed, and in the process of the following step S36, the exposure time is determined at the same time as the exposure time is determined by the brightness information obtained by the image detection in the above step S3 and the exposure is started To do.

Since the camera shakes if the camera shakes during this time, the CPU 1 detects the acceleration by the child in step S35, and obtains the acceleration g due to a shock or the like when the release button is pressed. That is, if this g is large, the camera shake photograph is obtained even if the exposure time is short, and if the g is small, the camera shake photograph is obtained even if this is small. In order to determine this, the CPU 1 counts the exposure time in the determination process of the subsequent step S38, and when determining that the exposure has ended in step S37, determines the g and the exposure obtained in the process of the subsequent step S40. The movement amount can be calculated from the fact that the speed is obtained from the time tEND and the time has changed by the time tEND due to this speed. Therefore, if this amount exceeds the allowable amount ΔY of the lens, a warning is issued in the processing of the subsequent step S40. Display control. If the amount of movement does not exceed the allowable range ΔY, the process ends.

As described above, only the change in speed can be known only by the acceleration, but in the present embodiment, first, it is determined that the vehicle is stopped at a predetermined position by the output (image signal) of the AF sensor not changing. Therefore, it is possible to accurately determine how much the camera has moved during exposure with reference to this.

Further, in the present embodiment, at the time of distance measurement, the distance measurement of miscellaneous objects around the photographing screen 111 is prevented.
As shown in FIGS. 16 (a) and 16 (b) (see FIG.
(A): Wide, FIG. 16 (b): Tele), the object image data of the range 113 in which the peripheral part of the photographing screen 111 is seen from the field of view 112 of the entire AF sensor is used, and at the time of blur detection, it is possible. To get a lot of subject information,
As shown in FIGS. 16 (c) and 16 (d) (see FIG.
(C): Wide mode, FIG. 16 (d): Tele mode) Since the subject image data in the field of view 112 of the entire AF sensor is used, highly accurate measurement can be performed.

Therefore, as described above, according to the present embodiment, since the AF sensor is effectively used, not only is the AF sensor used for distance measurement,
It can also be used for holding checks to increase the added value of the camera.

Further, by using together with the signal of the acceleration sensor, it is possible to detect shaking in the X direction and the Y direction to cope with a dark scene or a low contrast scene. It is possible to accurately calculate the camera movement amount.

With these, it is possible to accurately determine the camera shake after photographing in accordance with the focal length and aperture of the photographing lens and the shutter speed during photographing.

Needless to say, if the position of the taking lens is corrected by the calculated amount of movement, it can be applied to a camera with a vibration proof function.

The present invention is not limited to the above-mentioned embodiment, and the combination and application of each constituent element are also applied to the present invention.

[0080]

As described above, according to the present invention, even if a user who does not pay attention to camera shake is used,
Detecting and displaying camera shake The camera shake detection function, which allows you to take beautiful photos with little effect of camera shake while watching the check display, can be realized with higher accuracy and simpler structure than before, and at low cost. It is possible to provide a camera with a camera shake detection function that can be realized by. Also, AF
It is also possible to provide a camera with a camera shake detection function capable of performing higher-performance distance measurement and camera shake detection in consideration of the usage range of the measured subject image data according to the application of the sensor.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a configuration example of a camera with a camera shake detection function according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing an electrical block configuration of the camera of the present embodiment.

FIG. 3 is an explanatory diagram showing an example of a manufacturing process of an acceleration IC.

FIG. 4 is a configuration diagram showing a specific configuration of an acceleration IC.

FIG. 5 is a block diagram showing a configuration example of a processing circuit in the acceleration IC.

FIG. 6 is an explanatory diagram illustrating a vibration operation when camera shake occurs.

FIG. 7 is a characteristic diagram showing a time-acceleration characteristic according to a moving distance of a camera.

FIG. 8 is an explanatory diagram for explaining a vibration detection operation of the camera of the present embodiment.

FIG. 9 is a configuration diagram showing a configuration of a display segment in the LCD of the camera.

FIG. 10 is a perspective view seen from the rear side of the camera in a state where the warning display section blinks.

FIG. 11 is a perspective view of the camera with the self-timer LED blinking as seen from the front side.

FIG. 12 is a flowchart showing an example of a characteristic display control operation by the CPU of the camera.

FIG. 13 is a diagram showing an example of a warning pattern displayed on the LCD in the viewfinder.

FIG. 14: LCD in viewfinder when no camera shake occurs
FIG.

FIG. 15 is a diagram showing one display example of a camera shake warning displayed on the LCD in the viewfinder.

FIG. 16 is an explanatory diagram for explaining a use range of a subject image date used for detecting a camera shake.

[Explanation of symbols]

1 ... CPU, 2 ... IFIC, 3 ... Acceleration IC (monolithic accelerometer, acceleration sensor), 4 ... Memory, 5 ... AF sensor, 5a ... AF section, 5b ... Photometric section, 5c ... Sensor array, 5d ... Light receiving lens , 6 ... Liquid crystal display (LCD), 6a ... LCD in viewfinder, 7 ... Flexible substrate, 8 ... Strobe circuit, 9 ... Shooting lens, 10 ... Camera with camera shake detection function, 10A ... Camera body, 11 ... Warning display section , 12 ... Connector, 13 ... Switch pattern, 13a, 13b ... Switch, 14 ... Hard printed circuit board, 16 ... Rotating blade, 17 ... Photointerleaver, 18 ... Motor, 19 ... Shutter, 20 ... Silicon substrate, 21 ... Oxidation Membrane, 22 ... Polysilicon layer (movable electrode), 23a, 23b ... Arm part, 24, 25 ... Other electrode, 29 ... Processing circuit, 61 … Finder eyepiece, 65… LED for self-timer display.

Claims (4)

[Claims] 1. A camera with a camera shake detection function for detecting camera shake using an AF sensor of a camera for detecting a vibration state of a camera body, wherein object image data output from the AF sensor at predetermined time intervals. In comparison, when performing camera shake detection based on the image shift amount of the subject image data, the camera with a camera shake detection function is characterized in that the range of use of the subject image data is set to a range different from that during distance measurement. . 2. A camera with a camera shake detection function according to claim 1, wherein the range of use of the subject image when performing camera shake detection is wider than that during distance measurement. 3. The range of use of the subject image data is switched according to the focal lengths of the photographing lens and the photographing lens during distance measurement, and the range of use of the subject image data is constant regardless of the focal length of the photographing lens during camera shake detection. The method according to claim 1, wherein
The camera with the camera shake detection function described in. 4. When the camera shake is detected, the display means provided in the camera displays the occurrence of the camera shake to alert the user.
The camera with a camera shake detection function described in any one of 1.