JP7645455B2 - Image stabilizer, lens body and photographing device - Google Patents

Description

This disclosure relates to a blur correction device, a lens body, and an imaging device.

Patent documents 1 to 3 are known as examples of image stabilization devices for imaging devices.

Patent Document 1 discloses a shake correction device that has gyros that detect shake in the yaw and pitch directions, calculates the amount of shake of the imaging device based on the output from each gyro, and performs shake correction by moving the lens of the imaging device in a direction that cancels the shake.

Patent document 2 discloses an image stabilization device that includes shake detection means for detecting shake, shake correction means for correcting image shake caused by shake, drive means for driving the shake correction means in a direction for correcting image shake caused by shake, filtering means for cutting specific frequency components from the output from the shake detection means, characteristic change means for changing the frequency characteristics of the filtering means, and temperature detection means for detecting the temperature of the shake detection means or its surroundings, and the characteristic change means changes the frequency characteristics of the filtering means depending on the rate of change of temperature detected by the temperature detection means.

Patent document 3 discloses an image stabilization device having an acquisition means for acquiring an offset value of a shake detection means, a storage means for storing a plurality of offset values for each temperature by associating the offset value acquired by the acquisition means with a temperature, and a correction means for generating a correction signal by subtracting the offset value corresponding to the temperature from the output signal of the shake detection means and performing image stabilization based on the correction signal.

JP 2009-134058 A JP 2010-112974 A JP 2018-185499 A

The present disclosure aims to provide a blur correction device, a lens body, and an image capture device that can reduce blur using a simple method.

The image stabilization device according to the present disclosure comprises:
A blur detection means;
an offset setting means for setting an offset of a signal output from the shake detection means;
A filtering means for performing filtering using an output based on an offset,
The filtering means is
a first correction using a first cutoff frequency;
a second correction using a second cut-off frequency different from the first cut-off frequency;
When the difference between the characteristic value of the shake detection means when the offset is set and the characteristic value of the shake detection means after the offset is set is within an allowable range, a first correction is executed, and when the difference is outside the allowable range, a second correction is executed.

The lens body disclosed herein is equipped with the blur correction device described above.

The imaging device disclosed herein includes the image stabilization device and a lens body.

This disclosure provides a blur correction device, lens body, and imaging device that can suppress blur using a simple method. Specifically, by calculating the difference between the characteristic value of the blur detection means when the offset is set and the characteristic value of the blur detection means after the offset is set, it is possible to determine whether to perform the first correction or the second correction based on at least two characteristic values at the time the offset is set and after the offset is set, and blur can be reduced without the need for complex control.

FIG. 2 is a schematic diagram of an imaging device according to the present embodiment. FIG. 2 is a schematic diagram of a BIS processing unit or an OIS processing unit of the present embodiment. 5 is a graph showing the relationship between the gain and frequency of the HPF and the integral filter of the present embodiment. FIG. 13 is a schematic diagram of a modified example of a BIS processing unit or an OIS processing unit. FIG. 4 is a flowchart showing a flow of blur correction according to the present embodiment. FIG. 11 is a flowchart showing a flow of blur correction according to another embodiment. 3A to 3C are waveform diagrams showing input and output waveforms according to the embodiment of the present invention. 11 is a table and a graph showing the relationship between the temperature of the gyro sensor and the output signal offset of the gyro sensor.

[Foundations and other information that form the basis of this disclosure]
Optical devices such as photographing devices have traditionally been equipped with image stabilization devices to correct image blur and provide high-quality images. Image stabilization devices use an angular velocity sensor (hereinafter also referred to as a gyro sensor) to detect the amount of blur and act to cancel the amount of blur (see Patent Documents 1 to 3).

The gyro sensor outputs an offset (DC value) that varies depending on the surrounding temperature fluctuations. The offset output from the gyro sensor is removed, and the output after removal passes through an HPF (high pass filter) and an integral filter to obtain an angle signal. Here, the offset refers to the fact that a certain value is output even when the gyro is stationary, and it is known that if the offset changes due to temperature fluctuations, it can cause erroneous detection of shake.

Therefore, for example, Patent Document 2 discloses a technology in which temperature detection is performed at regular intervals T1 to calculate the temperature change rate and set the cutoff frequency of the filter. However, the technology described in Patent Document 2 constantly calculates the temperature change rate at regular intervals even when the temperature change rate of the gyro is small, so the temperature change rate is calculated frequently and is inefficient.

However, it is known that gyro sensors have individual differences in temperature characteristics from a manufacturing perspective. For example, as shown in FIG. 8, Gyro1 to Gyro3 are manufactured using the same manufacturing process. In the temperature characteristics of these gyro sensors, although Gyro1 and Gyro2 show a proportional relationship between temperature and offset (DC value), the proportional coefficients (slope of the straight line) are different. In addition, Gyro3 has a change point where the temperature characteristics change between 0°C and 10°C. Using these gyro sensors with individual differences to perform the shake correction described in Patent Documents 1 to 3 (for example, performing shake correction using gyro sensors with individual differences in the Yaw, Pitch, and Roll directions) is difficult because it is necessary to remove the offsets that differ from one gyro sensor to another.

The inventors of the present application attempted to solve the above problems by approaching them from a new direction, rather than simply extending the existing technology. As a result, they came up with the invention of a motion compensation device, lens body, and photographing device that achieve the above-mentioned main objective.

Below, an embodiment of the present disclosure will be described with appropriate reference to the drawings. However, in the detailed description, unnecessary parts of the description of the prior art and substantially the same configuration may be omitted. This is for the sake of simplicity. In addition, the following description and the accompanying drawings are disclosed so that a person skilled in the art can fully understand the present disclosure, and are not intended to limit the subject matter of the claims. Below, a digital camera will be used as an example of an imaging device for the description.

The digital camera of this embodiment is equipped with a shake correction device in each of the interchangeable lens and the photographing device body, which reduces the effect of blur of the photographing device on the captured image. Specifically, in the interchangeable lens, the effect of blur is reduced by moving a lens for blur correction in a plane perpendicular to the optical axis of the optical system in response to blur detected by a blur detection means such as a gyro sensor. On the other hand, a shake detection means may be provided in the photographing device body, and the effect of blur may be reduced by moving an image sensor such as a CCD in a plane perpendicular to the optical axis of the optical system in response to blur. The configuration and operation of the photographing device of this embodiment are described in detail below. In the following description, the function of correcting blur by shifting a correction lens in the interchangeable lens is referred to as the "OIS (Optical Image Stabilizer) function." Also, the function of correcting blur by shifting an image sensor in the photographing device body is referred to as the "BIS (Body Image Stabilizer) function."

1 is a block diagram showing the configuration of a digital camera according to an embodiment of the present disclosure. The image capturing device 1 is made up of an image capturing device body 100 and a lens body 200 that is detachable from the image capturing device body 100.

1-1. Imaging Device Body The imaging device body 100 may include an image sensor 110, a liquid crystal monitor 120, an operation unit 130, a camera controller 140, a body mount 150, a power source 160, and a card slot 170.

The camera controller 140 may control the operation of the entire photographing device 1 by controlling components such as the image sensor 110 in response to instructions from the shutter button. The camera controller 140 may transmit a vertical synchronization signal to the timing generator 112. In parallel with this, the camera controller 140 may generate an exposure synchronization signal. The camera controller 140 may periodically transmit the generated exposure synchronization signal to the lens controller 240 via the body mount 150 and the lens mount 250. The camera controller 140 may use a DRAM (not shown) as a working memory during control operations and image processing operations.

The imaging element 110 may be an element that captures an image of a subject incident through the lens body 200 and generates image data. The imaging element 110 may be, for example, a CCD, a CMOS image sensor, or an NMOS image sensor. The generated image data may be digitized by an AD converter 111. The digitized image data may be subjected to a predetermined image processing by the camera controller 140. The predetermined image processing may be, for example, gamma correction processing, white balance correction processing, scratch correction processing, YC conversion processing, electronic zoom processing, and/or JPEG compression processing.

The image sensor 110 may operate at a timing controlled by the timing generator 112. The image sensor 110 may generate still images, moving images, or through images for recording. The through images are primarily moving images, and may be displayed on the LCD monitor 120 to allow the user to determine the composition for capturing a still image.

The LCD monitor 120 may display images such as through images and various information such as menu screens. Instead of an LCD monitor, other types of display devices, such as an organic EL display device, may be used.

The operation unit 130 may include various operation members such as a shutter button for instructing the camera to start shooting, a mode dial for setting the shooting mode, and a power switch. The operation unit 130 may also include a touch panel superimposed on the LCD monitor 120.

The card slot 170 can accommodate a memory card 171, and may control the memory card 171 under control of the camera controller 140. The photographing device 1 can store image data in the memory card 171 and read image data from the memory card 171.

The power supply 160 may be a circuit that supplies power to each element within the imaging device 1.

The body mount 150 may be mechanically and electrically connected to the lens mount 250 of the lens body 200. The body mount 150 may be capable of transmitting and receiving data between the lens body 200 and the body mount 150 via the lens mount 250. The body mount 150 may transmit an exposure synchronization signal received from the camera controller 140 to the lens controller 240 via the lens mount 250. In addition, the body mount 150 may transmit other control signals received from the camera controller 140 to the lens controller 240 via the lens mount 250. In addition, the body mount 150 may transmit signals received from the lens controller 240 via the lens mount 250 to the camera controller 140. In addition, the body mount 150 may supply power from the power source 160 to the entire lens body 200 via the lens mount 250.

The imaging device body 100 may further include a gyro sensor 184 (shake detection means) that detects shake of the imaging device body 100 and a BIS processing unit 183 that controls shake correction processing based on the detection result of the gyro sensor 184 as a configuration for realizing a BIS function (a function for correcting camera shake by shifting the imaging element 110). Furthermore, the imaging device body 100 may include an element driving unit 181 that moves the imaging element 110. The element driving unit 181 may be realized, for example, by a magnet and a flat coil.

Furthermore, although not shown in FIG. 1, a position sensor that detects the position of the image sensor 110 may be provided. The position sensor may be a sensor that detects the position of the image sensor 110 in a plane perpendicular to the optical axis of the optical system. The position sensor may be realized, for example, by a magnet and a Hall element.

Based on the signal from the gyro sensor 184, the BIS processing unit 183 may control the element driving unit 181 to shift the image sensor 110 in a plane perpendicular to the optical axis so as to offset the blurring of the image capturing device body 100.

The lens body 200 may include an optical system, a lens controller 240, and a lens mount 250. The optical system may include a zoom lens 210, an OIS lens 220, a focus lens 230, and an aperture 260.

The zoom lens 210 may be a lens for changing the magnification of a subject image formed by the optical system. The zoom lens 210 may be composed of one or more lenses. The zoom lens 210 may be driven by a zoom lens driving unit 211. The zoom lens driving unit 211 may include a zoom ring that can be operated by the user. Alternatively, the zoom lens driving unit 211 may include a zoom lever and an actuator or a motor. The zoom lens driving unit 211 may move the zoom lens 210 along the optical axis direction of the optical system in response to operation by the user.

The focus lens 230 may be a lens for changing the focus state of the subject image formed on the image sensor 110 by the optical system. The focus lens 230 may be composed of one or more lenses. The focus lens 230 may be driven by a focus lens driving unit 233.

The OIS lens 220 may be a lens for correcting blur of a subject image formed by the optical system of the lens body 200 in the OIS function (a function for correcting camera shake by shifting the OIS lens 220). The OIS lens 220 may reduce blur of the subject image on the imaging element 110 by moving in a direction that offsets the blur of the imaging device 1. The OIS lens 220 may be composed of one or more lenses. The OIS lens 220 may be driven by an OIS driving unit 221.

The OIS driving unit 221 may shift the OIS lens 220 in a plane perpendicular to the optical axis of the optical system under the control of the OIS processing unit 223. The OIS driving unit 221 may be realized, for example, by a magnet and a flat coil. Furthermore, although not shown in FIG. 1, a position sensor that detects the position of the OIS lens 220 may be provided. The position sensor may be realized, for example, by a magnet and a Hall element. The OIS processing unit 223 may control the OIS driving unit 221 based on the output of the position sensor and the output of a gyro sensor 224 (shake detection means).

The aperture 260 may adjust the amount of light incident on the image sensor 110. The aperture 260 may be driven by an aperture drive unit 262, and the size of its opening may be controlled. The aperture drive unit 262 may include a motor or an actuator.

The gyro sensor 184, 224 may detect shake (vibration) in at least one of the Yaw direction, Pitch direction, and Roll direction based on the angle change per unit time of the image capture device 1, i.e., the angular velocity. The gyro sensor 184, 224 may output an angular velocity signal indicating the amount of shake (angular velocity) detected to the OIS processing unit 223 or the BIS processing unit 183. The angular velocity signal output by the gyro sensor 184, 224 may include a wide range of frequency components caused by camera shake, mechanical noise, etc. Instead of the gyro sensor, another sensor capable of detecting shake of the image capture device 1 may be used.

A temperature sensor 185, 225 may be provided near the gyro sensor 184, 224, and the temperature sensor 185, 225 may measure the temperature of the gyro sensor 184, 224. Note that instead of providing the temperature sensor 185, 225 near the gyro sensor 184, 224, the temperature sensor 185, 225 may be built into the gyro sensor 184, 224 itself.

The configuration of the OIS processing unit 223 or the BIS processing unit 183 will be described in detail later, but a memory (not shown) may be provided for storing data necessary for performing processing operations. The memory may store offset data for the temperature of the installed gyro sensor 184, 224 (see FIG. 8 as an example).

The camera controller 140 and the lens controller 240 may be configured as hardwired electronic circuits, or may be configured as a microcomputer using a program. For example, the camera controller 140 and the lens controller 240 can be realized by a processor such as a CPU, MPU, GPU, DSU, FPGA, or ASIC.

In this embodiment, the gyro sensors 184, 224 are provided on both the image capture device body 100 and the lens body 200, and the OIS lens 220 and the image sensor 110 are driven to correct blur. However, the present invention is not limited to this example, and the gyro sensor may be provided on either the image capture device body 100 or the lens body 200.

2, the configuration of the BIS processing unit 183 in the image capturing device body 100 or the OIS processing unit 223 in the lens body 200 will be described. The BIS processing unit 183 or the OIS processing unit 223 may include an offset processing unit 311 (offset setting means), a HPF (high pass filter) 312, and an integral filter 313 (filtering means).

The offset processing unit 311 may remove the offset of the signal from the gyro sensor 184. The offset refers to the signal that is output even when the gyro is stationary, and the offset can be removed by the offset processing unit 311.

The HPF 312 may cut off a predetermined low-frequency component (a frequency component equal to or lower than a cutoff frequency) included in the signal output from the offset processing unit 311 in order to cut off the drift component (see FIG. 3). In this embodiment, the HPF 312 may be set to a first cutoff frequency and a second cutoff frequency higher than the first cutoff frequency. Therefore, the HPF 312 may be provided with a cutoff frequency changing means 322 (see FIG. 2) for changing the cutoff frequency. Here, when the cutoff frequency is set to the first cutoff frequency, a high-precision calculation (a calculation corresponding to the first correction) that cuts off lower frequency components may be made possible, and when the cutoff frequency is set to the second cutoff frequency, a malfunction suppression calculation (a calculation corresponding to the second correction) that limits the frequency components that perform shake correction to a certain extent and suppresses malfunctions due to erroneous detection of shake may be made possible.

An example of the first cutoff frequency is about 0.001 to 0.1 Hz, and the second cutoff frequency is preferably 10 times or more the first cutoff frequency. By setting it in this way, it becomes easier to perform appropriate shake correction even if a false shake detection occurs.

The integral filter 313 may integrate the signal indicating shake (vibration) output from the HPF 312 to generate a shake detection signal (see FIG. 3). In this embodiment, the integral filter 313 may be set to a first cutoff frequency and a second cutoff frequency that is higher than the first cutoff frequency. Therefore, the integral filter 313 may be provided with a cutoff frequency change means 323 (see FIG. 2) that changes the cutoff frequency. When set to the first cutoff frequency, high-precision calculations may be possible, and when set to the second cutoff frequency, malfunction suppression calculations may be possible.

In this embodiment, a modification means for modifying the cutoff frequency is provided in both the HPF 312 and the integral filter 313, but a modification means for modifying the cutoff frequency may be provided in either one of the filters. Even in such a case, it is easy to perform appropriate shake correction.

The correction control unit 314 may generate a drive signal for shifting the OIS lens 220 or the image sensor 110 based on the output from the integral filter 313, and output the drive signal to the OIS drive unit 221 or the element drive unit 181. The OIS drive unit 221 may drive the OIS lens based on the drive signal. Also, the element drive unit 181 may drive the image sensor 110 based on the drive signal.

In the above description (FIG. 2), one HPF 312 and one integral filter 313 are provided as the BIS processing section or the OIS processing section, and the cutoff frequency is changed to a first cutoff frequency that can be calculated with high precision or to a second cutoff frequency that can be calculated to suppress malfunction by the cutoff frequency changing means 322, 323. Instead of this configuration, the BIS processing section or the OIS processing section shown in FIG. 4 may be used.

The BIS processing section or OIS processing section shown in FIG. 4 may be provided with an HPF 312 and an integral filter 313 that perform a high-precision calculation, and an HPF 312 and an integral filter 313 that perform a malfunction suppression calculation, and a signal selector 315 that selects whether to perform a high-precision calculation or a malfunction suppression calculation. In other words, the HPF 312 and the integral filter 313 that perform a high-precision calculation may be set to cut off frequencies equal to or lower than a first cutoff frequency, and the HPF 312 and the integral filter 313 that perform a malfunction suppression calculation may be set to cut off frequencies equal to or lower than a second cutoff frequency. Then, if a predetermined condition is satisfied by the signal selector 315, a signal corresponding to the high-precision calculation may be output, and if the predetermined condition is not satisfied, a signal corresponding to the malfunction calculation may be output.

With the configuration shown in Figure 4, there is no need to change the cutoff frequency, so the transient response after changing the cutoff frequency can be suppressed, making it easier to perform highly accurate shake correction.

2. Operation 2-1. Operation of the First Embodiment The operation of the imaging device configured as above will be described with reference to FIG.

After turning on the power of the imaging device and starting it up (S101), the offset for the gyro sensors 184 and 224 is initially set (S102).

The initial offset setting for the gyro sensor 184, 224 refers to the offset value for the temperature of the gyro sensor 184, 224 stored in the memory of the OIS processing unit 223 or the BIS processing unit 183 (S103). FIG. 8, which shows an example of the offset value, shows the offset values of the gyro sensor 184, 224 in 5°C increments from -10 to 40°C. Then, the temperature sensor 185, 225 measures the temperature of the gyro sensor 184, 224, and if there is an offset value corresponding to the measured temperature, the offset value corresponding to that temperature is sent to the offset processing unit 311 and set as the offset (S104). Then, the temperature (for example, temperature A) is stored in the memory (S105). On the other hand, if there is no offset value corresponding to the temperature of the gyro sensor 184, 224 measured by the temperature sensor 185, 225, a predetermined default value is sent to the offset processing unit 311 (S106).

Then, the process proceeds to the execution of calculations by the HPF 312 and the integral filter 313 (S107). Here, it is determined whether exposure to a still image has started (S108). That is, calculations for blur correction are performed when exposure to the image sensor 110 starts by pressing the shutter button. In other words, calculations for blur correction are performed when a still image is captured.

After exposure of the image sensor 110 starts, it is determined whether or not an offset value corresponding to the temperature measured in S103 exists (S109). If an offset value exists, the temperature of the gyro sensor 184, 224 at the current time after exposure starts is measured by the temperature sensor 185, 225 (S110). The measured temperature is recorded as temperature B, for example.

Then, the difference between the characteristic value of the gyro sensor 184, 224 when the offset is set and the characteristic value of the gyro sensor 184, 224 after the offset is set is calculated (S111). In this embodiment, the "temperature difference" of the gyro sensor 184, 224 is calculated as the characteristic value (the difference between temperature B and temperature A). If the temperature difference is within the allowable range, the cutoff frequency of the HPF 312 and/or the integral filter 313 is set to the first cutoff frequency and a high-precision calculation is performed (S112). On the other hand, if the temperature difference is outside the allowable range or if the offset shown in S106 does not exist, the cutoff frequency of the HPF 312 and/or the integral filter 313 is set to the second cutoff frequency and a malfunction suppression calculation is performed (S113).

Here, the "tolerance range", which is an index for determining whether to perform a high-precision calculation or a malfunction suppression calculation, is determined by whether or not a waveform drift occurs between the output waveform output from the HPF 312 and the integral filter 313 due to the offset set in the offset processing unit 311 and the input waveform input to the HPF 312. More specifically, a drift of ±1% is allowed for the output amplitude in the waveform shown in FIG. 7. When temperature is used as the characteristic value in this embodiment, as an example of the tolerance range of the above-mentioned drift, the amount of error accumulated during an exposure time of about 1 second becomes negligible, so that the tolerance range may be set to a case where the offset value corresponding to the temperature difference is within the range of ±10 mdps. Note that the temperature within the above-mentioned tolerance range is not limited to the above-mentioned numerical range.

As explained above, in this embodiment, the difference between the temperature of the shake detection means when the offset is set (S105) and the temperature of the shake detection means after the offset is set (S110) is calculated, and when the difference is within the allowable range, a high-precision calculation is performed, and when the difference is outside the allowable range, a malfunction suppression calculation is performed. Therefore, unlike conventional shake correction devices that detect the temperature at regular intervals, calculate the temperature change rate, and set the filter cutoff frequency, the shake correction method is determined based on the difference between at least two points, so shake can be reduced without the need for complex control such as constantly calculating the temperature change rate.

Furthermore, in this embodiment, because it is determined whether to perform a high-precision calculation or a malfunction suppression calculation based on the temperature difference of the gyro sensor, blur correction can be performed using a simpler method than conventional blur correction devices, which use three stages of control to raise, lower, or keep the cutoff frequency constant based on the temperature change rate.

Furthermore, in this embodiment, appropriate shake correction can be performed even if there are individual differences in the gyro sensor.

2-2. Operation of the Second Embodiment Next, a second embodiment of the operation of the image capturing apparatus will be described with reference to Fig. 6. In the above-mentioned first embodiment, the temperature is used as the characteristic value of the blur detection means, but in the second embodiment, an "offset value" is used as the characteristic value of the blur detection means.

After the imaging device is turned on and started up (S201), the offsets of the gyro sensors 184 and 224 are initially set (S202).

The initial setting of the offset in the gyro sensor 184, 224 refers to the offset value (for example, the data shown in FIG. 8) for the temperature of the gyro sensor 184, 224 stored in the memory of the OIS processing unit 223 or the BIS processing unit 183 (S203). Then, the temperature of the gyro sensor 184, 224 is measured by the temperature sensor 185, 225, and if there is an offset value corresponding to the measured temperature, the offset value corresponding to the temperature is transmitted to the offset processing unit 311 and set as the offset (S204). After that, the set offset value (for example, the offset value A ₁ ) is recorded in the memory (S205). On the other hand, if there is no corresponding offset value, a predetermined default value (for example, the offset value A ₀ ) is transmitted to the offset processing unit 311, and the set offset value A ₀ is recorded in the memory (S206).

Then, the process proceeds to the execution of calculations by the HPF 312 and the integral filter 313 (S207). Here, it is determined whether exposure to a still image has started (S208). In other words, calculations for image stabilization are performed when exposure to the image sensor 110 starts by pressing the shutter button.

After exposure of the image sensor 110 has started, the offset value (for example, the data shown in FIG. 8) stored in the memory of the OIS processor 223 or the BIS processor 183 is referenced to determine whether an offset value corresponding to the current temperature after exposure has started exists (S209). If an offset value exists in S209, the offset value (for example, offset value B) is acquired (S210).

Then, the difference between the characteristic value of the gyro sensor 184, 224 when the offset is set and the characteristic value of the gyro sensor 184, 224 after the offset is set is calculated (S211). In this embodiment, the "difference in offset value" of the gyro sensor 184, 224 is calculated as the characteristic value (the difference between the offset value B and the offset values _A1 , _A0 ). When the difference in offset value is within the allowable range, the cutoff frequency of the HPF 312 and/or the integral filter 313 is set to the first cutoff frequency to execute a high-precision calculation (S212). On the other hand, when the temperature difference is outside the allowable range or when the offset shown in S209 does not exist, the cutoff frequency of the HPF 312 and/or the integral filter 313 is set to the second cutoff frequency to execute a malfunction suppression calculation (S213).

The definition of the "tolerance range," which is an indicator of whether to perform a high-precision calculation or a malfunction suppression calculation, is the same as in the first embodiment. In this embodiment, when an offset value is used as a characteristic value, the tolerance range is set to within ±10 mdps, as an example of a range in which the above-mentioned amplitude deviation does not occur. Note that the offset value within the above-mentioned tolerance range is not limited to the above-mentioned numerical range.

As explained above, in this embodiment, the difference between the offset values _A0 , _A1 of the shake detection means when the offset is set and the offset value B of the shake detection means after the offset is set is calculated, and when the difference is within an allowable range, a high-precision calculation is performed, and when the difference is outside the allowable range, a malfunction suppression calculation is performed. Therefore, unlike conventional shake correction devices that detect temperature at regular intervals and calculate a temperature change rate to set the filter cutoff frequency, this embodiment determines the shake correction method based on the difference between at least two points, so shake can be reduced without the need for complex control such as constantly calculating a temperature change rate.

In addition, in this embodiment, since it is based on the difference in the offset values of the gyro sensors, appropriate shake correction can be performed even if, for example, the correlation between the temperature and offset in the gyro sensors has nonlinear characteristics. Also, since the index for whether to perform a high-precision calculation or a malfunction suppression calculation is the offset value of the gyro sensors 184 and 224, which is a factor in erroneously detecting shake, it is possible to perform shake correction with higher precision using the acquired offset value.

The above embodiment is intended to illustrate the technology in this disclosure. Therefore, the above embodiment may be modified, substituted, overburdened, and/or reduced in various ways within the scope of the claims or equivalents thereof.

(This disclosure)
The above embodiment discloses the following configuration.

(1) The image stabilization device is
A blur detection means;
an offset setting means for setting an offset of a signal output from the shake detection means;
filtering means for filtering using the output based on the offset;
A blur correction device comprising:
The filtering means is
a first correction using a first cutoff frequency;
a second correction using a second cut-off frequency different from the first cut-off frequency;
When the difference between the characteristic value of the shake detection means when the offset is set and the characteristic value of the shake detection means after the offset is set is within an allowable range, the first correction is executed, and when the difference is outside the allowable range, the second correction is executed.

(2) In (1), the characteristic value of the shake detection means may be the temperature of the shake detection means.

(3) In (1), the characteristic value of the shake detection means may be an offset value that offsets the shake detection means.

(4) In (1), the second cutoff frequency may be a frequency higher than the first cutoff frequency.

(5) In (4), the second cutoff frequency may be 10 times or more the first cutoff frequency.

(6) In (1), the correction means may include a switching unit that switches between executing the first correction and the second correction.

(7) In (1), the correction means may include a first correction means and a second correction means, the first correction means may perform the first correction, and the second correction means may perform the second correction.

(8) In (1), the characteristic value of the shake detection means when the offset is set may be obtained when the image capture device is started.

(9) In (8), the characteristic value of the shake detection means after the offset is set may be acquired when exposure of the image sensor of the photographing device begins.

(10) In (9), the exposure time of the image sensor may be when the image capture device captures a still image.

(11) A lens body equipped with the image stabilization device described in (1).

(12) A photographing device having the image stabilization device described in (1).

The concept of this disclosure can be applied to electronic devices with an imaging function and image stabilization function (imaging devices such as digital cameras and camcorders, mobile phones, smartphones, etc.).

1 Image capturing device 100 Image capturing device body 110 Image capturing element 111 AD converter 112 Timing generator 120 Liquid crystal monitor 130 Operation unit 140 Camera controller 150 Body mount 160 Power supply 170 Card slot 171 Memory card 181 Element driving unit 183 BIS processing unit 184 Gyro sensor 185 Temperature sensor 200 Lens body 210 Zoom lens 211 Zoom lens driving unit 220 OIS lens 221 OIS driving unit 222 Position sensor 223 OIS processing unit 224 Gyro sensor 225 Temperature sensor 230 Focus lens 233 Focus lens driving unit 240 Lens controller 250 Lens mount 262 Driving unit 311 Offset processing unit 313 Integral filter 314 Correction control unit 315 Signal selector 322, 323 Cutoff frequency changing means

Claims (11)

A blur detection means;
an offset setting means for setting an offset of the signal output from the shake detection means;
a filtering means for performing filtering using an output based on the offset;
A blur correction device for correcting blurring of an image when photographing with a photographing device , comprising:
The filtering means comprises:
a first correction using a first cutoff frequency;
a second correction using a second cut-off frequency different from the first cut-off frequency;
executing the first correction when a difference between a characteristic value of the shake detection means when the offset is set and a characteristic value of the shake detection means after the offset is set is within an allowable range, and executing the second correction when the difference is outside the allowable range;
the characteristic value of the blur detection means after the offset is set is acquired at the start of exposure of an image sensor of the photographing device;
Image stabilization device. The blur correction device according to claim 1, wherein the characteristic value of the blur detection means is the temperature of the blur detection means. The blur correction device according to claim 1, wherein the characteristic value of the blur detection means is an offset value that offsets the blur detection means. 4. The image stabilization device according to claim 1, wherein the second cutoff frequency is higher than the first cutoff frequency. The image stabilization device according to claim 4, wherein the second cutoff frequency is 10 times or more the first cutoff frequency. The image stabilization device according to any one of claims 1 to 5, wherein the filtering means includes a switching unit that switches between execution of the first correction and execution of the second correction. The filtering means includes a first correction means and a second correction means,
The first correction means performs the first correction,
6. The image stabilization device according to claim 1, wherein the second correction means executes the second correction. 8. The image stabilization device according to claim 1, wherein the characteristic value of said image stabilization means when said offset is set is acquired when said image capturing device is started up. The image stabilization device according to any one of claims 1 to 8, wherein the exposure of the image sensor is when the image capture device captures a still image. A lens body equipped with the blur correction device according to any one of claims 1 to 9. 11. An image pickup apparatus comprising the image blur correction device according to claim 1 or the lens body according to claim 10 .

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