Image stabilizer, lens body and photographing device

Abstract

To provide a shake correction device, a lens body, and a photographing device that can reduce a shake with a simple method.SOLUTION: A shake correction device comprises: shake detection means (gyro sensors 184, 224); offset setting means (offset processing unit 311) that sets offset of signals output from the shake detection means; and filtering means (HPF 312 and integration filter 313) that performs filtering by using output based on the offset. The filtering means can execute first correction using a first cutoff frequency and second correction using a second cutoff frequency different from the first cutoff frequency. When the difference between a characteristic value of the shake detection means during the setting of the offset and a characteristic value of the shake detection means after the setting of the offset is within an allowable range, the shake correction device executes the first correction, and when the difference is outside the allowable range, executes the second correction.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a blur correction device, a lens body, and an imaging device. [Background technology]

[0002] Patent Documents 1 to 3 are known as image stabilization devices for an imaging device.

[0003] 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.

[0004] Patent Document 2 discloses an image shake correction 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 changing 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, where the characteristic changing means changes the frequency characteristics of the filtering means depending on the rate of change of temperature detected by the temperature detection means.

[0005] Patent Document 3 discloses an image blur correction device having an acquisition means for acquiring an offset value of a shake detection means, a storage means for associating the offset value acquired by the acquisition means with a temperature and storing a plurality of offset values ​​for each temperature, and a correction means for generating a correction signal by subtracting the offset value corresponding to the temperature from an output signal of the shake detection means and performing image blur correction based on the correction signal. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2009-134058 A [Patent Document 2] JP 2010-112974 A [Patent Document 3] JP 2018-185499 A Summary of the Invention [Problem to be solved by the invention]

[0007] An object of the present disclosure is to provide a blur correction device, a lens body, and an image capturing device that are capable of reducing blur using a simple technique. [Means for solving the problem]

[0008] 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 performed, and when the difference is outside the allowable range, a second correction is performed.

[0009] The lens body according to the present disclosure includes the above-described image stabilization device.

[0010] An image capturing apparatus according to the present disclosure includes the above-described image stabilization device and a lens body. Effect of the Invention

[0011] This disclosure provides a blur correction device, a lens body, and an image capture device that can suppress blur using a simple method. Specifically, because 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 is calculated, 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 requiring complex control. [Brief description of the drawings]

[0012] [Figure 1] FIG. 2 is a schematic diagram of an imaging device according to the present embodiment. [Diagram 2] 3 is a schematic diagram of a BIS processing unit or an OIS processing unit of the present embodiment. FIG. [Diagram 3] 4 is a graph showing the relationship between gain and frequency of the HPF and integral filter of the present embodiment. [Figure 4] 11 is a schematic diagram of a modified example of a BIS processing unit or an OIS processing unit. [Diagram 5] FIG. 4 is a flowchart showing a flow of blur correction according to the present embodiment. [Figure 6] FIG. 11 is a flowchart showing a flow of blur correction according to another embodiment. [Figure 7] 3A to 3C are waveform diagrams showing input and output waveforms according to the embodiment of the present invention. [Figure 8] 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. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] [Knowledge that formed 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).

[0014] The gyro sensor outputs an offset (DC value) that varies depending on the surrounding temperature fluctuation. 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 placed stationary, and it is known that if the offset changes due to temperature fluctuation, it can cause erroneous detection of shake.

[0015] Therefore, for example, Patent Document 2 discloses a technique for detecting temperature at regular intervals T1, calculating the temperature change rate, and setting the cutoff frequency of a filter. However, the technique 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.

[0016] Incidentally, it is known that gyro sensors have individual differences in temperature characteristics from the viewpoint of manufacturing. For example, as shown in FIG. 8, Gyro1 to Gyro3 are manufactured by 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. Also, Gyro3 has a change point where the temperature characteristics change between 0°C and 10°C. It is difficult to perform the shake correction described in Patent Documents 1 to 3 using these gyro sensors with individual differences (for example, performing shake correction using gyro sensors with individual differences in the Yaw direction, Pitch direction, and Roll direction), because it is necessary to remove the offsets that are different for each gyro sensor.

[0017] The inventors of the present application attempted to solve the above problems by taking a new approach, rather than simply extending the conventional technology, and as a result, they have invented a motion compensation device, a lens body, and an image pickup device that achieve the above-mentioned primary object.

[0018] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings as appropriate. 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. In the following, a digital camera will be used as an example of an imaging device.

[0019] The digital camera of this embodiment includes a shake correction device in each of the interchangeable lens and the photographing device body that reduces the effect of the shake of the photographing device on the captured image. Specifically, in the interchangeable lens, the effect of the shake is reduced by moving a lens for shake correction in a plane perpendicular to the optical axis of the optical system in response to the shake detected by a shake detection means such as a gyro sensor. On the other hand, the effect of the shake may be reduced by providing a shake detection means in the photographing device body and moving an image sensor such as a CCD in a plane perpendicular to the optical axis of the optical system in response to the shake. The configuration and operation of the photographing device of this embodiment will be described in detail below. In the following description, the function of shifting a correction lens in the interchangeable lens to correct the shake is referred to as the "OIS (Optical Image Stabilizer) function." In addition, the function of shifting an image sensor in the photographing device body to correct the shake is referred to as the "BIS (Body Image Stabilizer) function."

[0020] 1. Configuration 1 is a block diagram showing the configuration of a digital camera according to an embodiment of the present disclosure. The photographing device 1 is made up of a photographing device body 100 and a lens body 200 that is detachable from the photographing device body 100.

[0021] 1-1. Imaging device body The photographing device main 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.

[0022] 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 an instruction 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.

[0023] 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 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.

[0024] The image sensor 110 may operate at a timing controlled by a timing generator 112. The image sensor 110 may generate still images, moving images, or through images for recording. The through images are mainly moving images, and may be displayed on the liquid crystal monitor 120 so that the user can decide the composition for capturing a still image.

[0025] The liquid crystal monitor 120 may display images such as through images and various information such as menu screens, etc. Instead of a liquid crystal monitor, other types of display devices, for example, an organic EL display device, may be used.

[0026] The operation unit 130 may include various operation members such as a shutter button for instructing the start of shooting, a mode dial for setting the shooting mode, a power switch, etc. The operation unit 130 may also include a touch panel arranged so as to be superimposed on the liquid crystal monitor 120.

[0027] 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.

[0028] The power supply 160 may be a circuit that supplies power to each element in the image capture device 1 .

[0029] The body mount 150 may be mechanically and electrically connectable to the lens mount 250 of the lens body 200. The body mount 150 may be capable of transmitting and receiving data to and from the lens body 200 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.

[0030] Furthermore, the photographing device body 100 may further include a gyro sensor 184 (shake detection means) that detects shake of the photographing 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 photographing device body 100 may include an element driving unit 181 that moves the imaging element 110. The element driving unit 181 may be realized by, for example, a magnet and a flat coil.

[0031] 1, a position sensor may be provided that detects the position of the image sensor 110. 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 by, for example, a magnet and a Hall element.

[0032] The BIS processing unit 183 may control the element driving unit 181 based on a signal from the gyro sensor 184 to shift the image pickup element 110 in a plane perpendicular to the optical axis so as to offset the shaking of the photographing device body 100 .

[0033] 1-2.Interchangeable lenses 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.

[0034] 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 an operation by the user.

[0035] The focus lens 230 may be a lens for changing the focus state of a 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.

[0036] 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 an 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 image sensor 110 by moving in a direction that offsets blur of the photographing 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.

[0037] 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).

[0038] The diaphragm 260 may adjust the amount of light incident on the image sensor 110. The diaphragm 260 may be driven by an diaphragm driving unit 262, and the size of the opening may be controlled. The diaphragm driving unit 262 may include a motor or an actuator.

[0039] 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, and the like. Instead of the gyro sensor, another sensor capable of detecting shake of the image capture device 1 may be used.

[0040] Temperature sensors 185, 225 may be provided near the gyro sensors 184, 224, and the temperature sensors 185, 225 may measure the temperatures of the gyro sensors 184, 224. Note that instead of providing the temperature sensors 185, 225 near the gyro sensors 184, 224, the temperature sensors 185, 225 may be built into the gyro sensors 184, 224 themselves.

[0041] 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) for storing data necessary for performing processing operations may be provided. The memory may store offset data for the temperature of the mounted gyro sensor 184, 224 (see FIG. 8 as an example).

[0042] The camera controller 140 and the lens controller 240 may be configured with a hardwired electronic circuit, or may be configured with a microcomputer using a program, etc. For example, the camera controller 140 and the lens controller 240 can be realized by a processor such as a CPU, an MPU, a GPU, a DSU, an FPGA, or an ASIC.

[0043] In this embodiment, a configuration has been described in which gyro sensors 184, 224 are provided in both the photographing device body 100 and the lens body 200, and the OIS lens 220 and the image sensor 110 are driven to correct blur, but the present invention is not limited to this example, and a gyro sensor may be provided in either the photographing device body 100 or the lens body 200.

[0044] 1-3.BIS Processing Unit and OIS Processing Unit 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), an HPF (high pass filter) 312, and an integral filter 313 (filtering means).

[0045] The offset processing unit 311 may remove an offset of the signal from the gyro sensor 184. The offset refers to a signal that is output even when the gyro is placed stationary, and the offset can be removed by the offset processing unit 311.

[0046] In order to cut off drift components, 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 (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. For this reason, 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 a first correction) for cutting off lower frequency components may be possible, and when the cutoff frequency is set to the second cutoff frequency, a malfunction suppression calculation (a calculation corresponding to a second correction) for limiting the frequency components for which shake correction is performed to some extent to suppress malfunctions due to erroneous detection of shake may be possible.

[0047] 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 the frequency in this way, it becomes easier to perform appropriate shake correction even if a shake is erroneously detected.

[0048] 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 higher than the first cutoff frequency. Therefore, the integral filter 313 may be provided with a cutoff frequency changing means 323 (see FIG. 2) for changing the cutoff frequency. When the cutoff frequency is set to the first cutoff frequency, high-precision calculation may be possible, and when the cutoff frequency is set to the second cutoff frequency, malfunction suppression calculation may be possible.

[0049] In this embodiment, the HPF 312 and the integral filter 313 are both provided with a changer for changing the cutoff frequency, but it is also possible to provide a changer for changing the cutoff frequency in either one of the filters. Even in such a case, it is easy to perform appropriate shake correction.

[0050] 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 driving unit 221 or the element driving unit 181. The OIS driving unit 221 may drive the OIS lens based on the drive signal. Also, the element driving unit 181 may drive the image sensor 110 based on the drive signal.

[0051] 1-4.Modifications 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.

[0052] The BIS processing section or the OIS processing section shown in Fig. 4 may include 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 the high-precision calculation or the malfunction suppression calculation. In other words, the HPF 312 and the integral filter 313 that perform the 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 the malfunction suppression calculation may be set to cut off frequencies equal to or lower than a second cutoff frequency. Then, when a predetermined condition is satisfied by the signal selector 315, a signal corresponding to the high-precision calculation may be output, and when the predetermined condition is not satisfied, a signal corresponding to the malfunction calculation may be output.

[0053] According to the configuration shown in FIG. 4, since there is no need to change the cutoff frequency, it is possible to suppress the transient response after the cutoff frequency is changed, facilitating highly accurate shake correction.

[0054] 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.

[0055] After the imaging device is turned on and started up (S101), an initial setting of the offset for the gyro sensors 184 and 224 is performed (S102).

[0056] The initial setting of the offset 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 is an example of the offset value, shows the offset values ​​of the gyro sensor 184, 224 at 5°C intervals from -10 to 40°C. 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 (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 transmitted to the offset processing unit 311 (S106).

[0057] 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. That is, calculations for blur correction are performed when a still image is captured.

[0058] After the start of exposure to the image sensor 110, it is determined whether or not there is an offset value corresponding to the temperature measured in S103 (S109). If there is an offset value, the current temperatures of the gyro sensors 184, 224 after the start of exposure are measured by the temperature sensors 185, 225 (S110). The measured temperature is recorded as temperature B, for example.

[0059] 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). When 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, when the temperature difference is outside the allowable range or when 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).

[0060] Here, the "tolerance range" which is an index for determining whether to perform a high-precision calculation or a malfunction suppression calculation is determined based on whether 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 allowable range of the above-mentioned drift, the amount of error accumulated during an exposure time of about 1 second becomes negligible, so that the allowable 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 allowable range is not limited to the above-mentioned numerical range.

[0061] 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 an allowable range, a high-precision calculation is executed, and when the difference is outside the allowable range, a malfunction suppression calculation is executed. Therefore, unlike conventional shake correction devices that detect the temperature at regular intervals, calculate a temperature change rate, and set the cutoff frequency of the filter, 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 a temperature change rate.

[0062] Furthermore, in this embodiment, since it is determined whether to perform a high-precision calculation or a malfunction suppression calculation based on the temperature difference of the gyro sensor, shake correction can be performed using a simpler method than conventional shake correction devices, which use three-stage control of raising, lowering, or keeping the cutoff frequency constant based on the temperature change rate.

[0063] Furthermore, in this embodiment, even if there are individual differences in the gyro sensors, appropriate shake correction can be performed.

[0064] 2-2. Operation of the Second Embodiment Next, a second embodiment of the operation of the photographing device 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.

[0065] After the imaging device is turned on and started up (S201), the offsets of the gyro sensors 184 and 224 are initially set (S202).

[0066] The initial setting of the offset in the gyro sensor 184, 224 refers to an 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 that temperature is transmitted to the offset processing unit 311 and set as the offset (S204). After that, the set offset value (for example, offset value A 1 On the other hand, if there is no corresponding offset value, a predetermined default value (for example, offset value A 0 ) is sent to the offset processing unit 311, and the set offset value A 0 is recorded in the memory (S206).

[0067] 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 blur correction are performed when exposure to the image sensor 110 starts by pressing the shutter button.

[0068] After exposure of the image sensor 110 starts, 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 or not there is an offset value corresponding to the current temperature after exposure starts (S209). If there is an offset value in S209, the offset value (for example, offset value B) is acquired (S210).

[0069] Then, the difference between the characteristic value of the gyro sensors 184, 224 when the offset is set and the characteristic value of the gyro sensors 184, 224 after the offset is set is calculated (S211). In this embodiment, the "difference in offset value" of the gyro sensors 184, 224 is calculated as the characteristic value (between offset value B and offset value A). 1 ,A 0If the difference in the offset values ​​is within the allowable range, the cutoff frequency of HPF 312 and / or integral filter 313 is set to the first cutoff frequency and a high-precision calculation is performed (S212). On the other hand, if the difference in temperature is outside the allowable range or if the offset shown in S209 does not exist, the cutoff frequency of HPF 312 and / or integral filter 313 is set to the second cutoff frequency and a malfunction suppression calculation is performed (S213).

[0070] Here, the definition of the "tolerance range" which is an index of whether to execute a high-precision calculation or a malfunction suppression calculation is the same as that in the first embodiment. When an offset value is used as a characteristic value in this embodiment, 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.

[0071] As described above, in this embodiment, the offset value A of the shake detection means when setting the offset 0 ,A 1 and offset value B of the shake detection means after the offset is set, and executes a high-precision calculation when the difference is within an allowable range, and executes a malfunction suppression calculation when the difference is outside the allowable range. Therefore, unlike conventional shake correction devices that detect temperature at regular intervals to calculate a temperature change rate and set the filter cutoff frequency, this 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.

[0072] Furthermore, in this embodiment, since it is based on the difference in the offset value of the gyro sensor, even if the correlation between the temperature and the offset in the gyro sensor has a nonlinear characteristic, it is possible to perform appropriate shake correction. Also, since the index for whether to perform a high-precision calculation or a malfunction suppression calculation is the offset value of the gyro sensor 184, 224, which is a factor in erroneously detecting shake, it is possible to perform shake correction with higher precision using the acquired offset value.

[0073] The above-described embodiment is intended to illustrate the technology of the present disclosure. Therefore, the above-described embodiment may be modified, substituted, loaded, and / or saved within the scope of the claims or equivalents thereof.

[0074] (This Disclosure) The above embodiment discloses the following configuration.

[0075] (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 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, a first correction is executed, and when the difference is outside the allowable range, the second correction is executed.

[0076] (2) In (1), the characteristic value of the shake detection means may be a temperature of the shake detection means.

[0077] (3) In (1), the characteristic value of the shake detection means may be an offset value that offsets the shake detection means.

[0078] (4) In (1), the second cutoff frequency may be higher than the first cutoff frequency.

[0079] (5) In (4), the second cutoff frequency may be 10 times or more the first cutoff frequency.

[0080] (6) In (1), the correction means may include a switching unit that switches between execution of the first correction and execution of the second correction.

[0081] (7) In (1), the correction means may include a first correction means and a second correction means, the first correction means performing the first correction, and the second correction means performing the second correction.

[0082] In (8)(1), the characteristic value of the shake detection means when the offset is set may be acquired when the photographing device is started up.

[0083] In (9)(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 starts.

[0084] In (10) and (9), the exposure time of the image sensor may be when the image capture device captures a still image.

[0085] (11) A lens body equipped with the image stabilization device described in (1).

[0086] (12) An imaging device having the image stabilization device described in (1). [Industrial Applicability]

[0087] The concept of the present disclosure can be applied to electronic devices (imaging devices such as digital cameras and camcorders, mobile phones, smartphones, etc.) having an imaging function and an image stabilization function. [Explanation of symbols]

[0088] 1. Imaging device 100 Imaging device body 110 Image sensor 111 A / D converter 112 Timing Generator 120 LCD monitor 130 Operation section 140 Camera Controller 150 Body Mount 160 Power supply 170 Card Slots 171 Memory Card 181 Element driver 183 BIS Processing Department 184 Gyro sensor 185 Temperature Sensor 200 Lens body 210 Zoom Lens 211 Zoom lens drive unit 220 OIS lens 221 OIS drive unit 222 Position Sensor 223 OIS Processing Unit 224 Gyro sensor 225 Temperature Sensor 230 Focus Lens 233 Focus lens drive unit 240 Lens Controller 250 lens mount 262 Drive unit 311 Offset Processing Unit 313 Integral Filter 314 Correction control section 315 Signal Selector 322,323 Means for changing cutoff frequency

Claims

1. A shake 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.

2. 2. The motion compensation device according to claim 1, wherein the characteristic value of said motion detection means is a temperature of said motion detection means.

3. 2. The blur correction device according to claim 1, wherein the characteristic value of said blur detection means is an offset value that offsets said blur detection means.

4. A blur correction device as described in any one of claims 1 to 3, wherein the second cutoff frequency is a frequency higher than the first cutoff frequency.

5. 5. The image stabilization device according to claim 4, wherein the second cutoff frequency is equal to or greater than ten times the first cutoff frequency.

6. 6. The image stabilization device according to claim 1, wherein the filtering means includes a switching unit that switches between execution of the first correction and execution of the second correction.

7. 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. 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.

9. 9. The image stabilization device according to claim 1, wherein the image sensor is exposed when a still image is captured by the image capture device.

10. A lens body comprising the blur correction device according to any one of claims 1 to 9.

11. 11. An imaging device comprising the blur correction device according to claim 1 or the lens body according to claim 10.

Images