JP3359138B2 - Camera system, image blur correction system, and image blur correction device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

The present invention relates to a camera system that detects a shake amount in an absolute space of a camera system and drives a correction optical system forming a part of a photographing optical system based on an output of the camera system.
Camera system to correct system shake , image shake correction
The present invention relates to an improvement in a system and an image blur correction device .

[0002]

2. Description of the Related Art Conventionally, a vibration isolator of this type has a shake sensor for detecting a camera shake amount of a photographer in a camera body or an interchangeable lens, and an output from the shake sensor is used.
There has been proposed an apparatus of a type that drives a correction optical system that forms a part of a photographing optical system in an interchangeable lens.

[0003]

However, in the above-described conventional apparatus, there is a type in which a shake sensor is provided in the camera body and a correction optical system is provided in the interchangeable lens, and a shake sensor and correction optical system are provided in the interchangeable lens. There are types that exist together, and when both types are combined, the two shake sensors operate together, so that there is a problem that the merits of combining the two cannot be fully utilized.

[0004] The first object of the present invention (object of invention), when used by the combination with means for detecting vibration in each camera side and the lens unit side, for optimum vibration damping effect Luke Mera cis-can thing
System . The second object of the present invention is to
Image stabilization system that can provide an appropriate image stabilization effect
And an image blur correction device.

[0005]

Means for Solving the Problems The first object is achieved.
In order to achieve this, the invention described in claim 1 includes a camera and a camera.
Camera system including lens device used with camera
Wherein the camera continuously detects image information of the subject.
Output from the photoelectric conversion unit and the output from the photoelectric conversion unit.
Calculating means for calculating the amount of shake applied to the camera;
Information transfer for transferring the calculation result by means to the lens device side
Means, and the lens device is provided in the absolute space of the lens.
A vibration sensor for mechanically detecting a vibration with respect to
The signal transferred from the transmission means and the signal from the shake sensor
Signal combining means for combining signals, and output from the signal combining means.
The optical path incident on the shooting optical system is tilted with respect to the optical axis based on the force.
Correction optical means, and information transmission means of the camera
Depending on the state of information transmission, the signal combining means
Camera system having signal synthesizing control means for controlling the synthesizing operation
It is a stem. Achieved the second objective
In order to do so, the invention according to claim 7 may be a photoelectric conversion means.
Camera shake and lens shake
A first-order roper that detects a certain natural frequency as a pole.
The first vibration sensor having a vibration characteristic and mechanical vibration detection
First-order high-pass with a certain natural frequency as a pole
A second shake sensor having characteristics, the first and second
Signal synthesizing means for synthesizing an output from the shake sensor;
Light incident on the imaging optical system based on the output from the signal combining means
Image blur having correction optical means for tilting the path with respect to the optical axis
This is a correction system. Similarly, the second purpose
In order to achieve the condition (1), the invention according to claim 8
Photoelectric conversion means for continuously detecting image information;
Calculate the amount of shake applied to the camera by the output from the means
Calculating means, and calculating results by the calculating means on the interchangeable lens side
Used with a camera having an information transmission means for transferring
An image blur correction device at least capable of being
A shake sensor that mechanically detects the shake of the device with respect to the absolute space
A signal transferred from the information transmitting means and the vibration.
Signal synthesizing means for synthesizing a signal from the sensor, and the signal
Optical path incident on the imaging optical system based on the output from the combining means
Correction optical means for tilting the information transmission means with respect to the optical axis;
The signal synthesizing means according to the information transmission state of the stage.
And a signal synthesis control means for controlling the signal combining operation that
This is an image blur correction device.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

FIG. 1 is a diagram showing the overall configuration of an image stabilizing camera according to an embodiment of the present invention, and shows the internal configuration of a camera body 1 and an (exchangeable) lens 2.

First, the configuration of the camera body 1 will be described.

Inside the camera body 1, there is a CPU 3 for controlling the entire camera. The CPU 3 has a switch 4 (SW1) which is turned on by a first stroke of a release button of the camera and a switch 5 which is turned on by a second stroke. (SW2) is connected, and the display driving means 10 as a shutter time of the camera and warning means is directly controlled by the CPU 3. Further, the motor driver 11 becomes operable by a control signal from the CPU 3, and the drive output energizes the mirror driving motor 12, and the mirror 1 is turned on when the switch SW2 is turned on.
3 is performed. The camera body 1
Has a dedicated optical system 6, through which image information of a subject is taken into the area sensor 7, and after this information is temporarily stored in the field memory 8, the motion vector detecting circuit 9 Time correlation operation is 2
This is performed on the dimensional area, and the result is transferred to the CPU 3.

Next, the configuration of the lens 2 will be described.

Inside the lens 2, there is a CPU 15 for overall control of the inside of the lens. This CPU 15 is connected to the CPU 3 via an interface 16 with the camera body 1, and exchanges information with the camera body 1 (transmits and receives). It has such a configuration. In addition, shake sensors 17 and 18 for detecting shake in the yaw and pitch directions of the entire camera body 1 and the lens 2 are arranged as shown in FIG.
The data is taken in as data in the CPU 15 via the / D converter 21.

The correction optical system 20 for shaking, which constitutes the front surface of the photographing optical system 19 or a part thereof, has a movement amount of the yaw direction position detecting means 23 and the pitch direction position detecting means 2.
4 and its output is taken into the CPU 15 via the A / D converter 21 in the same manner as described above.
After the arithmetic control described later is executed inside the D / 15, the D /
The signal is output through the A converter 22. And this D
The output of the / A converter 22 is transferred to the yaw correction system driving unit 25 and the pitch correction system driving unit 26, respectively, and the correction optical system 20 is driven by the drive output.

Next, the operation of the camera having the above configuration will be described.
This will be described with reference to the flowcharts of FIGS.

First, the main processing of the camera body 1 will be described with reference to FIGS. 6 to 8 using the flow chart of FIG.

First, in step 100, the state of the switch SW1 (4) is determined.
If it is determined that 1 is ON, the next step 10
At 1, the operation of the area sensor 7 is started. Here, image information of the area sensor 7 at a certain time t ₁ is:
As shown in FIG. 6, the luminance data of the pixels in the two-dimensional directions x and y is fetched and transferred to the field memory 8. Next, the image information at time t ₂ after the lapse of a predetermined time is taken into the area sensor 7, and in a next step 102, a known correlation operation between the image data of the area sensor 7 and the data of the field memory 8 is performed. Time t ₁ and t
The motion amount of the image between the _two is calculated in both the x and y directions.

Therefore, as shown in FIG.
The amount of image shake generated by the shake is detected by the area sensor 7.

In FIG. 6, since the area information at the time t ₁ and the area information at the time t ₂ are different depending on the shake of the camera body 1, for example, the shake in the x direction in FIG. From the amount of correlation between each of the j columns of the information on t ₁ and t ₂ , it is detected which image blur has occurred,
From the motion vector detection circuit 9 to the CPU 3, the image blur amount △ x
a.

Similarly, for the deflection in the y direction in FIG.
From the correlation amount between the i rows of the information at times t ₁ and t ₂ , which image shake is occurring is detected, and is transferred from the motion vector detection circuit 9 to the CPU 3 as the image shake amount △ ya.

In the following step 103, it is determined whether or not the switch SW2 (5) is ON. If it is determined that the switch SW2 is OFF, step 104
Then, as the data of the area sensor 7 in the yaw direction, data corresponding to the above-mentioned $ xa is transferred. As for this data communication, serial communication as shown in FIG. 7 is generally used.
Data corresponding to $ xa is sent one bit at a time through the DO line.

In the next step 105, it is determined whether or not the transmission of the predetermined amount of data has been completed. If it is determined that this has been completed, then in step 106, the area sensor in the pitch direction is Data corresponding to the data #ya of No. 7 is transmitted. Again,
At the next step 107, it is determined whether or not a predetermined amount of data transmission has been completed.
Returning to step 102 again, detection of a motion vector between times t ₂ and t ₂ is performed.

As described above, within the camera body 1, the shake amount of the camera body 1 is calculated from the movement amount of the subject image at different time intervals at a fixed time interval Δt (ie, sampling interval), and This information is transferred from the camera body 1 to the lens 2
To be sent to

Generally, the frequency characteristic of the shake signal obtained from the area sensor 7 is determined by its sampling period T, calculation time, delay time t associated with data transmission, and accumulation time ta of the area sensor 7. As shown in (1), the gain decreases and the phase delay increases toward the higher frequency side, which approximates the characteristics of a so-called low-pass filter.

Next, the operation of the lens 1 will be described with reference to FIGS. 9 to 12 using the flowcharts of FIGS.

First, at step 120, it is determined whether or not the value of an internal timer for generating the timing required to sample the outputs of the shake sensors 17 and 18 in the lens 1 has reached Tx at every fixed time Tx. Then, when it is detected that the timer has reached the predetermined time, sampling and calculation of the sensor output in step 121 and thereafter are executed.

In step 121, an A / D conversion operation of the output of the yaw shake sensor 17 mounted inside is started. The internal configuration of the shake sensor 17 is shown in FIG.
As shown in the figure, the vibration gyro is constituted by an angular velocity sensor and an integrating circuit.
0 is resonantly driven by the drive circuit 222, and output is converted by the synchronous detection circuit 221 so as to have a predetermined angular velocity output. The output from the synchronous detection circuit 221 usually contains an unnecessary DC offset, and this DC component is removed by a high-pass filter including a capacitor 224 and a resistor 225, and only the remaining shake signal is output from the operational amplifier 223. The signal is amplified by an amplifier composed of the resistors 226 and 227 and becomes input data to the A / D converter 21 as described above.

In the next step 122, it is determined whether or not the A / D conversion has been completed. If the end of the A / D conversion has been detected, in the next step 123, the yaw vibration sensor 17 Data conversion is performed.

This method will be described with reference to the flowchart of FIG.

After step 140 in FIG. 4A, the information of the area sensor 7 on the camera
This section describes the operation of a serial communication interrupt to be received by the camera body. When data is sent from the camera body 1, sensor information of the camera body 1 is automatically input.

In step 141, it is determined whether or not the interrupt operation is yaw area sensor data. If the interrupt operation is yaw data, in step 142, the serial data is set in a register ADY inside the CPU 3. Then, in the next step 143, it is similarly determined whether or not the data is pitch area sensor data.
At 4, the serial data is set in the register ADP inside the CPU 3.

As described above, on the lens 1 side, sensor information on the camera body 1 side can be received through the serial interface 16 at regular intervals.

Next, in step 150 of FIG. 4B, the yaw / pitch fluctuation sensor 1 in the lens 1 described above is used.
A data conversion operation is performed on the outputs of the sensors 7 and 18 (hereinafter, referred to as mechanical sensors). And step 1
At 51, it is determined whether or not the area sensor information in the camera body 1 is input through the serial interface 16 as described above. If this is not detected, only the sensor information in the lens 1 is valid, or Then, it is determined that the area sensor 7 does not exist on the camera body 1 side, and the data conversion for the mechanical sensor is performed. Here, an integration operation for converting a speed signal from a mechanical sensor into a displacement signal is performed in step 1.
The processing is performed at 56 to 158.

In steps 156 to 158, calculations are performed using the constants A _LN0 , A _LN1 , and B _LN1 obtained by converting the frequency characteristics necessary for the integration into parameters by the well-known SZ conversion, and a signal from the mechanical sensor is obtained. The integration result is output to O _{LY (P)} based on S _{LY (P)} . FIG. 10A shows this frequency characteristic, and a certain natural frequency f
_{On the} low frequency side below ₁ , the gain decreases, which is a so-called high-pass filter characteristic.

On the other hand, if it is determined in step 151 that the area sensor information in the camera has been inputted through the interface 16 as described above, the information of the mechanical sensor in the lens 1 and the information of the area sensor 7 are combined. In addition, the method of calculating the information of the mechanical sensor changes.

In steps 152 to 154, a digital filter operation is performed based on the known SZ conversion similar to the method in steps 156 to 158 described above.
In this case, the coefficients A _LM0 , A _LM1 , and B _LM1 are the above-mentioned A
Unlike _LN0 , A _LN1 , and B _LN1 , the characteristic of O _{LY (P)} calculated as a result of the integration based on the signal S _{LY (P)} from the mechanical sensor has a certain characteristic as shown in FIG. Frequency f ₂
This is a so-called high-pass filter characteristic in which the gain decreases on the lower frequency side.

Here, the value of the natural frequency f ₂ is higher than the above-mentioned f ₁ , and therefore, the information of the lens 1
The characteristic of the mechanical sensor in the inside changes to the higher frequency side.

Next, in step 155, the internal register ADY storing the information of the area sensor 7 sent from the camera body 1 by serial communication is stored.
The value of _(P) is added to the above-described integration result O _{LY (P),} and the result is set to O _{LY (P)} again. FIG. 10B shows a characteristic corresponding to the calculation result. A mechanical sensor showing the characteristics of the high-pass filter and an area sensor 7 showing the characteristics of the low-pass filter are synthesized near a frequency of about fx. As shown by the dotted line, a characteristic that is substantially flat from the low band to the high band is formed. More specifically, if the area sensor 7 has a primary low-pass characteristic with fx as a pole, and the mechanical sensor characteristic has a primary high-pass characteristic with fx as a pole, about -fx near fx.
A characteristic that is reduced only by 3 dB is obtained.

When the sensor data processing in the yaw direction is completed as described above, returning to FIG. 3 again, in step 124, the A / D conversion operation for the correction system output indicating the correction movement amount of the correction optical system 20 in the yaw direction is performed. Once started, in the next step 125, it is determined whether the A / D conversion operation has been completed.

Here, a specific configuration of the correction optical system 20 is shown in FIG.

FIG. 11 shows a configuration of a so-called shift optical system which corrects the camera shake by shifting the lens in parallel in the x and y directions perpendicular to the optical axis. In FIG. A yoke portion as a magnetic circuit unit serving as an actual drive source in the x and y axis directions is 2
52 and 253 are coil portions corresponding to the respective yokes. Therefore, when current is supplied from the driver circuits 25 and 26 to the coil units 252 and 253, the lens group 254, which is a part of the photographing lens, is eccentrically driven in the x and y directions. Further, 255 is the lens 254
1 shows a support arm and a support frame for fixing. On the other hand, the movement of the lens group 254 is caused by the iREDs 256 and 257 that move integrally with the lens and the PSD 262 mounted on the lens barrel 60 for holding the entire shift lens.
263 is detected in a non-contact manner. or,
Reference numeral 258 denotes a mechanical lock mechanism for mechanically holding the lens substantially at the center of the optical axis when the power supply to the shift system is stopped, 259 denotes a charge pin, and 261 denotes a falling direction of the shift system. The supporting sphere as an anti-tilt for regulation is shown respectively.

As described above, the amount of movement of the correction optical system 20 is A /
It is taken into the CPU 15 via the D converter 21. When it is detected in step 125 that the conversion operation has been completed, the process proceeds to step 126, where the calculation result of the sensor output in the yaw direction is calculated. A comparison is made with the output result of the yaw correction system, and a feedback operation is performed to stabilize the entire system so that the two agree. Incidentally, a phase compensation calculation is generally performed as the feedback calculation, but details will be described with reference to a flowchart of FIG.

The feedback calculation of the correction system after step 170 will be described.

[0042] In step 171 (in the case of pitch, O _LP register) O _LY register set of the operation result of the sensors described above and T _Y register value of the position output of the correction optical system 20 is set ( For pitch, T _P
The difference from the _SY register (pitch)
_In the next step 172, the result is multiplied by predetermined data LPG which determines the loop gain of the feedback control of the correction system, and the result is set again in the S _Y (or S _P ) register. Is done.

Next, with respect to steps 173 to 175, the phase compensation calculation of this correction optical system 20 (in this case, 1
In the flow for executing the next phase lead compensation), the values of the coefficients B1, A0 and A1 used in this flow are known in advance.
It is set as predetermined data by Z conversion.

First, in step 173, the S
_From the contents of the _Y (or _SP ) register, predetermined coefficient data B1
And the result of multiplication of the arithmetic register C _Y (or C _P , these registers store the values determined at the previous sampling), and the result is D _Y (or D D
_P ) Set in the register. In the next step 174, the predetermined coefficient data A0 and the D _Y
The product value of the predetermined coefficient data A1 and the product value of the C _Y (or C _P ) register are converted to the product value of the (or D _P ) register, and the final result is set in the O _Y (or O _P ) register.
Finally, in step 175, D
The value of the _Y (or D _P ) register is transferred to the C _Y (or C _P ) register, and the feedback operation of the correction optical system 20 ends.

Returning to FIG. 3, in step 127, the value of the _OY register is transferred to the D / A converter 22 of FIG. 1 as DATA as a result of the above-described correction system feedback operation in the yaw direction, and corresponds to this output value. Is applied to the correction optical system 20 via the drive circuit 25, and the correction optical system 20 is driven in the yaw direction based on the sensor output in the yaw direction.

Accordingly, the above-described correction optical system 20 is driven in accordance with information from the mechanical sensor in the lens 1 and the area sensor 7 in the camera body 1, so that a so-called shake correction operation is performed. Become.

The operations in steps 128 to 134 in the pitch direction are exactly the same as those in steps 121 to 127 described above, and a description thereof will be omitted.

According to the present embodiment, by combining the area sensor 7 in the camera body 1 and the shake sensors 17 and 18 in the lens 2, the information of both sensors can be exchanged through a predetermined interface. There is an effect that the weight of the sensor can be set freely.

In this embodiment, a method is described in which the information of the area sensor 7 in the camera body 1 is transferred to the lens 2 at regular time intervals and the sensor information is synthesized by a predetermined calculation in the lens 2. Conversely, a method of transmitting sensor information on the lens 2 side to the camera body 1, synthesizing both sensor information by a predetermined calculation in the camera body 1, and transmitting the result to the lens 2 side again It is also conceivable that a calculation method in the lens 2 is greatly simplified.

[0050]

According to the first aspect of the present invention, as described above.
According to the invention , the camera side and the lens apparatus side are respectively shaken.
Used in combination with means to detect motion
In some cases, the best anti-vibration effect can be exhibited
It can provide a camera system. Claims
According to the invention described in 7 or 8, an optimal vibration damping effect is exhibited.
Image blur correction system and image blur correction apparatus
Can be provided.

Therefore, it is possible to provide an anti-vibration camera capable of exhibiting an optimum anti-vibration effect when used in combination with a means for detecting vibration on each of the camera body side and the lens side.

[Brief description of the drawings]

FIG. 1 is a mechanism diagram schematically illustrating an image stabilizing camera according to an embodiment of the present invention.

FIG. 2 is a flowchart showing main processing on the camera body side in FIG. 1;

FIG. 3 is a flowchart showing main processing on the lens side in FIG. 1;

FIG. 4 is a flowchart showing an operation of taking in an area sensor output of FIG. 1 and converting data of a mechanical sensor.

FIG. 5 is a flowchart showing a detailed operation of the feedback calculation of FIG. 3;

FIG. 6 is a diagram for explaining a case where an image blur amount is detected from the area sensor of FIG. 1;

FIG. 7 is a diagram illustrating a case where data obtained by the area sensor of FIG. 1 is communicated to the lens side.

8 is a diagram showing frequency characteristics when performing image blur correction using the area sensor output of FIG. 1;

FIG. 9 is a block diagram illustrating a configuration of the mechanical sensor of FIG. 1;

FIG. 10 is a diagram illustrating frequency characteristics when performing image blur correction using the output of the mechanical sensor of FIG. 1;

11 is an exploded perspective view showing the configuration of the correction optical system of FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Camera main body 2 Lens 3,15 CPU 7 Area sensor 9 Motion vector detecting means 16 Interface 17,18 Yaw, pitch shake sensor (mechanical sensor) 20 Correction optical system

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G03B 5/00 G03B 17/00 H04N 5/232

Claims (10)

(57) [Claims] 1. A camera and a laser used with the camera.
A camera system including a camera device, wherein the camera
Includes a photoelectric conversion means for continuously detecting the image information of the object, and calculating means for calculating an amount of shake applied to the camera by the output from the photoelectric conversion means, the operation result by the arithmetic means
The and a communication means for transferring the lenses apparatus, wherein
A lens device configured to mechanically detect a shake of the lens with respect to an absolute space; a signal synthesizing unit that synthesizes a signal transferred from the information transmission unit and a signal from the shake sensor; Correction optical means for inclining the optical path incident on the photographing optical system with respect to the optical axis based on the output from the signal combining means
And the information transmission state of the information transmission means of the camera.
Controlling the signal combining operation by the signal combining means.
A camera system comprising signal synthesis control means.
Stem. 2. The signal synthesizing control means according to claim 1 , wherein
A signal corresponding to the image blur is transmitted by the information transmitting means.
To determine whether or not the signal
Deciding whether or not to perform the signal combining operation in a stage
The camera system according to claim 1, wherein: Wherein said signal combining means, camera-side lens
The apparatus according to claim 1, wherein, when synthesizing the respective shake signals of the apparatus , the means shifts the frequency characteristic of a shake sensor disposed in the lens apparatus to a higher frequency side.
Or the camera system according to 2 . Wherein said signal combining means, camera-side lens
3. A camera system according to claim 1, wherein said shake signal is a means for synthesizing a shake signal of each device side with a signal having characteristics in which upper and lower frequencies are substantially symmetric with respect to a predetermined frequency.
Stem. 5. A signal from the front Kijo report transmission means is composed of a digitally signal, according to claim 1 or 2 camera system, wherein the a signal to be transferred. Signal from 6. Before Kijo report transmitting means, according to claim 1 or 2 camera system, wherein the a signal transferred at every predetermined time interval. 7. A first vibration having a first-order low-pass characteristic having a certain natural frequency as a pole for detecting a shake of a camera body and a lens based on a subject image output from a photoelectric conversion unit.
Re and sensors to detect the mechanical vibrations, a second vibration is having a first-order high-pass characteristic to poll a certain natural frequency
Sensor and said first and signal synthesizing means for synthesizing outputs from the second shake sensor, correcting optical means for tilting the optical axis of the optical path entering the imaging optical system based on an output from said signal synthesizing means An image blur correction system comprising: 8. A photoelectric sensor for continuously detecting image information of a subject.
Conversion means and an output from the photoelectric conversion means to the camera
Calculating means for calculating an added shake amount;
Information transmission means for transferring the operation result to the lens side
Image blur at least possible to be used with camera
A compensating device that uses a mechanical
From the information transmission means
To combine the signal from the shake sensor and the signal from the shake sensor
Combining means, and photographing light based on an output from the signal combining means.
Correction optical means for tilting the optical path incident on the optical system with respect to the optical axis
Depending on the information transmission state by the information transmission means,
Signal combining for controlling the signal combining operation by the signal combining means.
An image blur correction device, comprising: a control unit. 9. The information transmission control means according to claim 1, wherein
Whether a signal corresponding to the image blur is transmitted by the means
The signal synthesizing means according to the determination result.
Determining whether or not to perform a signal combining operation.
The image blur correction device according to claim 8, wherein: 10. The signal synthesizing means are used together.
Camera has a function to transmit a signal corresponding to image shake
It is determined whether or not the signal synthesis means according to the determination result
Determining whether to perform the signal synthesizing operation or not.
9. The image blur correction device according to claim 8, wherein