JPH0980500A - Blur correcting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save a power consumption and to suppress the burdens on a CPU by selecting either of a calculated blur reference value, or a stored blur reference value in accordance with the remaining amount of a power source and the processing capacity of the CPU. SOLUTION: In the blur correcting device 10, the relative value of the blur reference value is regarded as the blur correcting amount, and the optical axis of the blur correcting optical system is changed so as to correct the blur. The device is provided with a blur sensor 11 for detecting the blur and a reference value calculating part 12a for calculating the blur reference value, based on the output detected by the blur sensor 11. Besides, the device is provided with a reference value storing part 12b for storing the previously adjusted blur reference value of the blur sensor 11. Either of the reference value calculating part 12a and the reference value storing part 12b is selected by a reference value setting part 12c so as to set the blur reference value. The blur reference value is set, based on either of information on the remaining amount of the power source 4, information on the processing ability of the CPU, and manual input information.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shake correction device for correcting shake caused by vibration of an optical device such as a camera, and more particularly, to a shake correction amount based on an output of relative shake detected by a shake detection sensor. The present invention relates to a shake correction device to be obtained.

[0002]

2. Description of the Related Art Conventionally, this type of shake correction apparatus shifts a shake correction lens in a plane direction perpendicular to an optical axis of an optical system based on a shake correction amount, and , VR) has been put to practical use.

For the shake correction amount, a VR sensor detects an angle of vibration, an angular velocity, an angular acceleration, etc. generated in an optical device such as a camera, and uses this as a reference as a relative angle, angular velocity, angular acceleration, etc. It is obtained by calculation based on the following angle, angular velocity, angular acceleration, etc. (hereinafter referred to as blur reference value). Therefore, in order to calculate the shake correction amount, it is necessary to obtain the shake reference value. It should be noted that the VR sensor vibrates a vibrating portion in the sensor at a predetermined frequency and detects a rotational movement caused by the vibration of the shake correction device main body as a Coriolis force.

The simplest way to obtain the shake reference value is to output 0 when the shake correction device body is stationary, that is, all of the angles, angular velocities, angular accelerations, etc.
The output can be obtained by fixing an optical device such as a camera with a tripod or the like. However, it is not realistic to do this for each shooting.

Therefore, the conventional blur correction device calculates all outputs from the supply of electric power to the VR sensor to the start of exposure, and averages them, for example, at the time of shooting with a camera. I was looking for a blurring reference value.

As the shake reference value, for example, at the time of shipment from the factory, it is conceivable to measure the output in a stationary state for each VR sensor and store this value in a storage unit provided in an optical device such as a camera.

[0007]

The above-described conventional blur correction device has the following problems in obtaining the blur reference value.

As described above, since the VR sensor vibrates the vibrating portion in the sensor to detect the shake, this vibration becomes constant and it takes some time for the output to stabilize. Therefore, before the output of the sensor stabilizes, highly accurate blur correction can be performed regardless of whether the averaged blur reference value or the blur reference value stored in the storage unit is used. It is not possible, and there is a possibility that the blur will increase. Therefore, in order to perform the shake correction with higher accuracy, it is necessary to wait for the exposure start until a certain period of time after the power is supplied to the VR sensor until the sensor output stabilizes. It is necessary to continue supplying power to the VR sensor.

However, since the power source of the optical device such as a camera is limited and there are various restrictions depending on the model, it is difficult to continuously supply the power to the VR sensor as described above.

The calculation of the blur reference value is performed by a central processing unit (hereinafter referred to as CPU) provided in an optical device such as a camera, but the processing capacity of this CPU is also limited. That is, since the CPU also processes the AE and AF calculations, it is difficult to increase the speed of the complicated calculations and obtain the shake reference value in a short time. Further, considering the manufacturing cost of an optical device such as a camera and the size of the main body, it is not possible to significantly improve the processing capability of the CPU.

Therefore, in the above-described conventional shake correction apparatus, the VR sensor must be operated for a long time in order to perform the shake correction with higher accuracy, and as a result, the power is significantly consumed and the CPU is also consumed. There was a problem of burdening. In addition, the above-described conventional shake correction device is provided in an optical device such as a camera, and when it is not necessary to perform high-precision shake correction, for example, to release a high-speed shutter, or when power consumption or CPU Even when it is desired to reduce the burden, there is a problem in that it is not possible to perform blur correction based on the photographer's intention.

A first object of the present invention is to set the shake reference value for calculating the shake correction amount in a short time while maintaining a certain degree of accuracy, so that power consumption or C
An object of the present invention is to provide a shake correction device that reduces the load on the PU. A second object of the present invention is to reduce the power consumption or the load on the CPU depending on the shooting conditions.
An object of the present invention is to provide a shake correction device capable of selecting a shake reference value for calculating a shake correction amount based on the will of a photographer.

[0013]

In order to solve the above-mentioned problems, the invention of claim 1 changes the optical axis of the blurring correction optical system by using the relative value of the blurring reference value as the blurring correction amount. In a shake correction device that corrects a blur, a blur sensor that detects a blur, a reference value calculation unit that calculates a blur reference value based on an output detected by the blur sensor, and a pre-adjusted blur reference value of the blur sensor are stored. And a reference value setting unit for selecting one of the reference value calculation unit and the reference value storage unit to set the blur reference value.

According to a second aspect of the present invention, in the shake correction device according to the first aspect, the reference value setting unit sets the shake reference value based on information about the remaining amount of the power source. .

According to a third aspect of the present invention, in the blur correction device according to the first aspect, the reference value setting unit sets the blur reference value based on information regarding a processing capacity of the central processing unit. I am trying.

According to a fourth aspect of the present invention, in the blur correction device according to the first aspect, the reference value setting unit sets the blur reference value based on manually input information.

According to a fifth aspect of the present invention, in a shake correction device that corrects the shake by changing the optical axis of the shake correction optical system using the relative value of the shake reference value as the shake correction amount, a shake sensor for detecting the shake is provided. , A reference value calculator for calculating a shake reference value based on the output detected by the shake sensor,
When a difference between a reference value storage unit that stores a pre-adjusted blur reference value of the blur sensor, a calculation result in the reference value calculation unit, and a blur reference value stored in the reference value storage unit is within a predetermined range. Includes a reference value setting unit that sets a calculation result of the reference value calculation unit as a blurring reference value.

According to a sixth aspect of the present invention, in a shake correction device that corrects the shake by changing the optical axis of the shake correction optical system using the relative value of the shake reference value as the shake correction amount, a shake sensor for detecting the shake is provided. , A reference value calculator for calculating a shake reference value based on the output detected by the shake sensor,
When a predetermined time elapses, the reference value calculation unit is stopped, and a reference value setting unit that sets the calculation result at the time of stop as a shake reference value is provided.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) Hereinafter, embodiments of the present invention will be described in more detail with reference to the drawings. FIG. 1 is a block diagram showing a first embodiment of a blur correction device according to the present invention. In this embodiment, the camera is equipped with the image stabilization apparatus according to the present invention. The camera of this embodiment is composed of a camera body 1 and a lens 2, and the camera body 1 has a main switch Msw for turning on a power source and a shutter button and a focal length which are adjusted by half-pressing a release button. A half-press switch (S1) for preparing for shooting and a full-press switch (S2) for performing a release operation and starting exposure by full-press are provided.

The camera body 1 is also provided with a shake correction device 10
And an automatic exposure device 20 and an automatic focus adjustment device 30. In the shake correction device 10, the VR sensor 11
Is the attitude of the camera (position, velocity, acceleration,
Angle, angular velocity, angular acceleration).

The drive circuit control section 12 also includes a reference value calculation section 12a, a reference value storage section 12b, and a reference value setting section 12.
and c. The reference value calculation unit 12a is a unit that calculates a shake reference value based on the output detected by the VR sensor 11. The reference value storage unit 12b is a unit that stores a previously adjusted blur reference value, and stores, for example, a blur reference value calculated from the output of the VR sensor 11 in a stationary state. The reference value setting unit 12c is a unit that selects a shake reference value that serves as a reference for calculating the shake correction amount, and when the remaining amount of the power source 4 of the camera body 1 is equal to or greater than a certain value, the reference value calculation unit 12a, the blur reference value calculated by 12a is selected.
The blur reference value stored in 2b is selected [the invention of claim 2].

Further, the reference value setting unit 12c selects the blur reference value detected by the detection sensor 11 when the processing capacity of the CPU 3 has a margin, and when there is no margin,
The shake reference value stored in the reference value storage unit 15 is selected [the invention of claim 3].

The drive circuit controller 12 calculates the drive amount, drive speed, and drive direction of the VR lens (not shown) based on the blur reference value selected by the reference value setting unit 12c, and the VR lens drive circuit 13 The VR lens drive unit 14 is driven via the to move the VR lens. Note that VR
The lens movement amount detection unit 15 uses the encoder or the like to detect the V
This is a part for detecting the amount of movement of the R lens.

In the automatic exposure device 20, the AE sensor 21 detects the light amount of the object, the drive circuit control unit 22 calculates an appropriate exposure amount, and the aperture blade drive circuit 23 drives the aperture blade drive unit 24. To move a diaphragm blade (not shown), and at the same time, to drive a shutter drive unit 26 via a shutter drive circuit 25 to drive a shutter (not shown).
To expose a film (not shown).

The automatic focusing device 30 includes an AF sensor 31.
Detects the distance to the subject or the phase difference,
The drive circuit controller 32 calculates the focus adjustment drive amount,
Through the focus lens drive circuit 33, the focus lens drive unit 3
4 is driven and a focus lens (not shown) is moved to perform focusing.

FIG. 2 shows a first embodiment of the blur correction device according to the present invention.
3 is a flowchart showing the embodiment of FIG. In this embodiment, the camera is equipped with the image stabilization apparatus according to the present invention. The following operation is performed by one CPU 3, but the drive circuit control units 12, 22, 32 shown in FIG.
Each function of will be described as being shared. The main switch Msw is turned on (S101: Y
es), when the half-push switch S1 is turned on (S102: Ye
s), power is supplied to each of the sensors 11, 21, 31 of VR, AE, AF to start detection, and calculation is performed based on these outputs, and the drive circuit control unit 22 sets the appropriate shutter speed and aperture. The values etc. are determined, and the drive circuit control unit 32
The AF drive is instructed (S103).

Here, the drive circuit control unit 12 determines the remaining amount of the power source 4 of the camera body 1 or the processing capacity of the CPU 3 by the CPU.
Contact 3. When the remaining amount of the power source 4 is equal to or more than a certain amount or when the processing capacity of the CPU 3 has a margin (S104: Yes), the reference value calculation unit 12a determines the shake reference value based on the output detected by the VR sensor 11. The calculation of is started (S105). The VR sensor 1 calculates the shake reference value.
This is done by averaging all of the outputs from the start of detection by 1 to the start of exposure. This calculation is continuously performed while the half-push switch S1 is half-pushed in order to improve the accuracy of the shake reference value.

Further, when the remaining amount of the power source 4 is less than a certain level, or when the processing capacity of the CPU 3 has no margin (S10
4: No), the blurring reference value stored in the reference value storage unit 12b is read (S115).

That is, the blur reference value is selected according to the remaining amount of the power source 4 or the processing capacity of the CPU 3, and is set in the reference value setting section 12c.

On the other hand, in the drive circuit control section 12, the half-press switch S1 (S102) causes the optical axis of the VR lens to be VR.
The VR lens is centered toward a predetermined initial position so as to be the center of the optical axis of the entire photographing lens, which is the initial position for starting driving (S106).

Here, when the half-push switch S1 is continuously pressed (S107: Yes) and the full-push switch S2 is further pressed (S108: Yes), the drive circuit controller 12 is detected by the VR sensor 11. Output
The drive amount, drive speed, and drive direction of the VR lens are calculated based on the blur reference value set in the reference value setting unit 12c, and the drive of the VR lens drive unit 14 is started via the VR lens drive circuit 13. (S109). In addition, when the half-push of the half-push switch S1 is released (S10
7: NO), and waits until it is pressed halfway again (S10).
2: No).

Next, the drive circuit controller 22 starts the exposure of the film (S110) and finishes the exposure at a predetermined time (S111). Then, the drive circuit controller 12
When the R drive is stopped (S112), the CPU 3 starts the preparation operation for the next shooting such as film feeding, shutter charging, and mirror down (S113). After that, the power supply to the sensors 11, 21, 31 is stopped (S114), and the photographing ends. In addition, in (S104), it has been described that the blurring reference value is selected according to the remaining amount of the power source 4 or the processing capability of the CPU 3, but, for example, according to the remaining amount of the power source 4 and the processing capability of the CPU 3. You may make it select.

(Second Embodiment) FIG. 3 is a flow chart showing a second embodiment of the blur correction device according to the present invention. Each of the embodiments described below shows a case where a camera is equipped with the shake correction device according to the present invention. Note that each embodiment described below has the same hardware configuration as that of the above-described first embodiment, and therefore, illustration and redundant description will be omitted.

In the second embodiment, the photographer selects whether the blur reference value is calculated from the output of the VR sensor 11 or is stored in the reference value storage section 12b.
The reference value setting section 12c can be manually input [the invention of claim 4].

That is, each of the VR, AE, and AF sensors 1
After power is supplied to 1, 21, and 31 (S103) and detection is started, the drive circuit control unit 12 sets the reference value setting unit 12
Queries the setting status of c. Further, the drive circuit control unit 12 calculates the blur reference value from the output of the VR sensor 11 by the reference value calculation unit 12a based on the setting state of the reference value setting unit 12c (S205), or the reference value storage unit 12b.
The blurring reference value stored in is read (S215). After that, the drive circuit control unit 12 calculates the blur correction amount based on the blur reference value set in the reference value setting unit 12c.

According to the second embodiment, when it is not necessary to perform high-precision blur correction in order to release the high-speed shutter,
Alternatively, the blurring reference value can be set based on the intention of the photographer when it is desired to reduce the power consumption or the load on the CPU.

(Third Embodiment) FIG. 4 is a flow chart showing a third embodiment of the blur correction device according to the present invention. In the third embodiment, the calculation of the blur reference value is started based on the output of the VR sensor 11, and when the calculated blur reference value approaches the blur reference value stored in the reference value storage unit 15, The calculation is ended, and the approaching value is used as the blur reference value [invention of claim 5].

That is, each of the VR, AE, and AF sensors 1
After power is supplied to 1, 21, and 31 (S103) and detection is started, the drive circuit control unit 12 sets the reference value calculation unit 1
2a, the calculation of the blurring reference value is started based on the output of the VR sensor 11 (S305), and then the blurring reference value stored in the reference value storage unit 12b is read (S31).
5).

The drive circuit controller 12 compares the calculated blur reference value with the stored blur reference value (S316),
If the difference is within the predetermined range (S317: Ye
s), at which point the calculation of the blurring reference value is terminated (S31
8) The shake reference value is determined (S319).

The time required for the difference between the calculated shake reference value and the stored shake reference value to fall within the predetermined range is output to the storage unit, which can be used, for example, as a fourth value to be described later. In the blur correction device of the above embodiment, it can be used to determine a predetermined time for the blur reference value calculation (S417).

If the difference between the calculated blur reference value and the stored blur reference value does not fall within the predetermined range due to, for example, the condition at the time of shooting being different from the condition at the time of storage (S317: No), by pressing the full-press switch S2 (S
320: Yes), and the blur reference value calculated at that time is determined (S329). If the full-press switch S2 is not fully pressed, the calculation of the shake reference value is continued until the difference is within the predetermined range (S320: N).
o).

According to the third embodiment, the calculation of the blurring reference value is finished when the difference between the blurring reference value and the stored blurring reference value is within the predetermined range, so that the power consumption thereafter can be suppressed. Besides, the processing capacity of the CPU can be directed to other processing. Further, when the shooting condition is different from the storage condition, the difference between the calculated blur reference value and the stored blur reference value does not fall within the predetermined range. In this case, Since the shake reference value is determined according to the conditions, it is possible to perform the shake correction with high accuracy.

Further, since the output of the VR sensor is sufficiently stable after the determination of the blur reference value, even if abrupt panning is performed, the blur reference value will be erroneous unless it is an exposure during panning. Does not occur.

(Fourth Embodiment) FIG. 5 is a flow chart showing a fourth embodiment of the blur correction device according to the present invention. In the fourth embodiment, the calculation of the shake reference value is started based on the output of the VR sensor 11, and the calculation is ended when a predetermined time elapses to determine the shake reference value. ].

That is, each of the VR, AE, and AF sensors 1
After the power is supplied to 1, 2, 31 and 31 (S103) to start the detection, the drive circuit control unit 12 sets the VR sensor 11
The calculation of the blurring reference value is started based on the output of (S4
05). Then, after a predetermined time elapses (S417: Y
es), the calculation is ended (S419), and the shake reference value is determined (S419).

Before the predetermined time elapses (S41
7: No), and when the full-press switch S2 is fully pressed (S420: Yes), the calculation ends at that point (S420: Yes).
428), and the shake reference value is determined (S429). In addition,
When the full-press switch S2 is not fully pressed (S42
0: No), the time for calculating the reference value is measured again (S4).
17).

According to the fourth embodiment, the calculation of the blurring reference value is completed after the elapse of a predetermined time, so that the power consumption thereafter can be suppressed and the processing capacity of the CPU is directed to other processing. be able to.

Further, after the blur reference value is determined, the output of the VR sensor is sufficiently stable, so that even if sudden panning is performed, this causes an error in the blur reference value unless the exposure is during panning. Does not occur.

[0049]

As described in detail above, according to the present invention, either the calculated blur reference value or the stored blur reference value is selected according to the remaining amount of the power source and the processing capacity of the CPU. Therefore, the blurring reference value can be set in a short time while maintaining a certain degree of accuracy, and it is possible to provide the blurring correction device that suppresses the power consumption and the load on the CPU.

Further, since either the calculated blur reference value or the stored blur reference value can be selected by manual input, when this is used in a photographing device such as a camera, the photographing situation According to the above, or in order to reduce the power consumption and the load on the CPU, the shake reference value can be selected based on the photographer's intention, and the usability of the image capturing device such as a camera can be improved.

Further, when the difference between the calculated blur reference value and the stored blur reference value is within the predetermined range, the calculation is terminated at that point and the blur reference value is determined. It is possible to provide a blur correction device that suppresses the consumption of power and the load on the CPU. Further, since the calculation of the shake reference value is finished and the shake reference value is determined after the lapse of a predetermined time, it is possible to provide the shake correction device in which the power consumption and the load on the CPU are suppressed.

[Brief description of drawings]

FIG. 1 is a block diagram showing a first embodiment when a camera is equipped with a blur correction device according to the present invention.

FIG. 2 is a flowchart showing an operation of the blur correction device according to the first embodiment.

FIG. 3 is a flowchart showing an operation of the blur correction device in the second example.

FIG. 4 is a flowchart showing an operation of the blur correction device in the third example.

FIG. 5 is a flowchart showing an operation of the blur correction device in the fourth example.

[Explanation of symbols]

1 Camera 2 Lens 3 CPU 4 Power Supply 10 Image Stabilizer 11 VR
Sensor 12 Drive circuit control unit 12a Reference value calculation unit 12b Reference value storage unit 12c Reference value setting unit 13 VR Lens drive circuit 14 VR
Lens drive unit 15 VR lens movement amount detection unit 16 Manual selection unit 20 Automatic exposure device 21 AE
Sensor 22 Drive circuit control unit 23 Aperture blade drive circuit 24 Aperture blade drive unit 25 Shutter drive circuit 26 Shutter drive unit 30 Automatic focus adjustment device 31 AF sensor 32 Drive circuit control unit 33 Focus lens drive circuit 34 Focus lens drive unit

Claims (6)

[Claims] 1. A shake correction device that corrects a shake by calculating a shake correction amount based on a detected relative shake and a shake reference value and changing an optical axis of a shake correction optical system. A blur sensor for detecting blurring, a reference value computing unit for computing a blurring reference value based on an output detected by the blurring sensor, a reference value storage unit for storing a preliminarily adjusted blurring reference value of the blurring sensor, A blur correction device comprising: a reference value calculation unit and a reference value setting unit that selects one of the reference value storage units and sets the blur reference value. 2. The blur correction device according to claim 1, wherein the reference value setting unit sets the blur reference value based on information about a remaining amount of a power source. 3. The blur correction device according to claim 1, wherein the reference value setting unit sets the blur reference value based on information regarding a processing capacity of the central processing unit. Correction device. 4. Any one of claims 1 to 3
The blur correction device according to the item 1, wherein the reference value setting unit sets the blur reference value based on manual input information. 5. A shake correction device that corrects a shake by calculating a shake correction amount based on a detected relative shake and a shake reference value and changing an optical axis of a shake correction optical system, A blur sensor for detecting blurring, a reference value computing unit for computing a blurring reference value based on an output detected by the blurring sensor, a reference value storage unit for storing a preliminarily adjusted blurring reference value of the blurring sensor, When the difference between the calculation result in the reference value calculation unit and the blur reference value stored in the reference value storage unit is within a predetermined range, a reference value setting that sets the calculation result of the reference value calculation unit as the blur reference value. An image stabilization device having a section. 6. A shake correction device that corrects a shake by calculating a shake correction amount based on a detected relative shake and a shake reference value and changing an optical axis of a shake correction optical system. A blur sensor that detects a blur, a reference value calculation unit that calculates a blur reference value based on the output detected by the blur sensor, and when a predetermined time has elapsed, stop the calculation of the reference value calculation unit and A blur correction device comprising a reference value setting unit that sets a calculation result at the time of stop as a blur reference value.