JP3968255B2 - Imaging device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an imaging apparatus, and more particularly, to forming an image of a subject on a light receiving surface of the imaging device by the imaging optical system, fetches into an electric signal, for example, by camera shake during shooting correcting the image blur on the light receiving surface resulting impact on imaging by deflection is related to imaging device which is to be as small as possible.
[0002]
[Prior art]
Conventionally, this type of image pickup apparatus is known as a video camera or a digital still camera. For example, in the case of a digital still camera, due to the limit of sensitivity of an image pickup device composed of a CCD (charge coupled device), it is as short as a silver salt photograph. It is difficult to realize the shutter time, and blurs such as “image flow” tend to occur in an image captured by camera shake.
[0003]
Shake correction usually detects angular velocities around two fixed axes perpendicular to the optical axis of the camera, determines the camera's "tilt angle due to shake" around these two axes, and image shake corresponding to this tilt angle. The correction lens included in the photographic optical system is displaced, the direction of the optical axis is adjusted, and the image sensor is moved. The mechanism moves in two axial directions.
[0004]
In general, as a mechanism for correcting image blur, a correction member that independently corrects the image blur generated by moving the imaging position on the light receiving surface in two different directions orthogonal to the optical axis of the camera, A microcomputer (hereinafter referred to as “microcomputer”) detects a shake amount in two directions based on the output of a shake detection sensor such as an angular velocity sensor, and a correction member on the light receiving surface so as to eliminate the image shake based on the detected shake amount. The image forming position is displaced in two directions.
[0005]
More specifically, in order to detect the amount of shake in two directions based on the detection output of the shake detection sensor, the microcomputer digitally converts the analog electrical signal that is the sensor output at the first predetermined sampling period, and acquires this. The shake amount is detected by the digital value. Next, a displacement amount corresponding to the detected shake amount in each direction is calculated, and driving for driving the actuator constituting the correction member so as to displace the imaging position on the light receiving surface by an amount corresponding to the displacement amount. By outputting a signal to the actuator, image blur that may occur in each direction due to camera shake is eliminated.
[0006]
The member that is actually actuated by the actuator to correct the image blur is a correction lens in a lens optical system that is a photographing optical system that determines the image formation position of the image, or an image is formed in an electronic camera. Any device that can change the image formation position, such as a CCD image sensor, may be used. Then, the above-described correction operation from taking in the sensor output to driving the correction member is performed in the same manner with respect to the shake in any direction.
[0007]
This type of camera is generally provided with a shake correction ON / OFF mode, and the camera user can operate and stop the shake correction function by arbitrarily switching and selecting the mode. When the shake correction mode is in the operating state, each angular velocity sensor always detects camera shake, calculates a displacement amount for shake correction based on the detected shake, and drives the correction means. It is done with a microcomputer.
[0008]
[Problems to be solved by the invention]
By the way, the correction operation of the correction member must be performed as faithfully as possible to the output change of the sensor that detects the shake and with good followability. For this purpose, the microcomputer captures the sensor output by shortening the sampling cycle as much as possible, and the microcomputer outputs to the actuator that constitutes the correction member and changes the drive signal that determines the displacement amount for shake correction with the smallest possible gradation. In order to achieve more accurate shake correction, the microcomputer is required to have high-speed processing capability.
[0009]
In addition, in an imaging device having an additional function of voice recording for recording information about shooting by voice and leaving it as a memo at the time of shooting, in general, the microcomputer installed in this is not only shake correction, In order to record audio information, the audio signal must be converted into a digital signal and captured, and recorded on a recording medium. For this reason, the burden on the microcomputer becomes heavier, and in order to perform shooting as quickly as possible, a microcomputer capable of high-speed processing is required, which has been a major factor in increasing the cost.
[0010]
Therefore, in view of the above-described points, the present invention substantially reduces the accuracy of shake correction without increasing the cost by changing the correction operation corresponding to the direction of shake when recording information related to shooting. without prejudice to, and an object of the invention to provide a the imaging device to allow a voice recording during shooting.
[0011]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the invention according to claim 1 of the present application forms an image of a subject on a light receiving surface of an image pickup device by a shooting optical system, converts it into an electric signal, and captures information related to shooting as sound. recording by a imaging device which is to perform the correction for shooting the image blur on the light receiving surface, a first direction perpendicular to the optical axis of the imaging optical system, the imaging optical system A shake detection unit that detects a shake in a second direction perpendicular to the optical axis and perpendicular to the first direction, and outputs a detection signal corresponding to the magnitude of the shake in the detected two directions; The shake correction means for independently displacing the imaging position on the light receiving surface in the first direction and the second direction, and the detection signal output from the shake detection means are periodically fetched, and the fetched detection signal based on, driving the stabilization means Calculating means for predicting and determining displacement amounts for displacing the imaging position on the light receiving surface in the first direction and the second direction, respectively, using a prediction calculation expression including a high-order term; Is periodically driven so as to correct the image blur due to the shake by displacing the imaging position on the light receiving surface in the first direction and the second direction based on the displacement amount determined by Drive control means for controlling, and when performing the voice recording, the calculation means temporarily calculates the displacement amount in a direction in which vibration is unlikely to occur in the first direction and the second direction. The prediction calculation formula to be determined is changed to a simplified prediction calculation formula that does not include higher-order terms, and the drive control means sets a cycle for displacing the imaging position on the light receiving surface in a direction in which the shake is unlikely to occur. Taking you and changing the long cycle Apparatus resides in.
[0012]
According to the above-described configuration of the first aspect, the shake detection unit has the first direction orthogonal to the optical axis of the imaging optical system and the first direction orthogonal to the optical axis of the imaging optical system and orthogonal to the first direction. 2 detects a shake in two directions and outputs a detection signal corresponding to the magnitude of the shake in the two directions, and the shake correction means sets the imaging position on the light receiving surface in the first direction and the second direction. Displacement is performed independently, and the calculation means periodically captures the detection signal, and based on the captured detection signal, the shake correction means is driven to move the imaging position on the light receiving surface in the first direction and the second direction. A displacement amount to be displaced is determined by predicting and calculating from a prediction calculation formula including a high-order term, and based on the displacement amount determined by the calculating means, the drive control means determines the imaging position on the light receiving surface in the first direction and vibration so as to correct the image blur due to shake is displaced in the second direction Driving and controlling the correction means. In addition, when performing voice recording, the calculation means temporarily calculates a high-order term using a prediction calculation formula that predicts and determines the amount of displacement in the direction in which vibration is unlikely to occur in the first direction and the second direction. The driving control means changes the period for displacing the imaging position on the light receiving surface to a longer period in a direction in which it is difficult for vibration to occur. Therefore, when performing voice recording, it is possible to simplify the process for determining the amount of displacement in the direction in which the arithmetic means hardly causes vibration without substantially impairing the accuracy of shake correction, and drive control. It is possible to reduce processing for driving the means in a direction in which it is difficult for vibration to occur.
[0015]
According to a second aspect of the present invention, in the imaging apparatus according to the first aspect, when the voice recording is performed, the calculation unit temporarily generates the shake in the first direction and the second direction. The imaging apparatus is characterized in that a period for capturing the detection signal corresponding to a difficult direction shake is changed to a period longer than a period for capturing the detection signal in the other direction .
[0016]
According to the configuration of the second aspect, when performing voice recording, the period for capturing the detection signal corresponding to the shake in the direction in which the shake is difficult to occur in the first direction and the second direction is set to the other direction. Since the period is changed to a period longer than the period in which the detection signal is captured, the burden of determining the displacement amount by predicting and calculating the direction in which the vibration hardly occurs is further reduced.
[0019]
The invention of claim 3 Symbol placement, in an imaging apparatus according to claim 1 or 2 wherein the resulting hard direction of the shake lies in an imaging device you being a direction perpendicular to the release push-in direction .
[0020]
According to the configuration of claim 3 Symbol placement, so hard to generate the direction of deflection is in the direction perpendicular to the release push-in direction, without substantially compromising the accuracy of the release push during shake correction, that perform voice recording it can.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of an imaging apparatus according to the present invention, and schematically shows a schematic configuration of a digital still camera with a shake correction function.
[0022]
In FIG. 1, a digital still camera with a shake correction function forms an image of a subject on a light receiving surface 13a of an image pickup device 13 that is also built in the camera body by means of a photographing optical system 11 built in the camera body. The image is converted into a signal and captured, and image blur caused by camera shake at the time of shooting is corrected, so that the influence of shooting on shooting is minimized.
[0023]
Specifically, the photographing optical system 11 includes a zoom lens 11A and a focus lens 11B as imaging lenses, and an imaging element 13 is disposed on the optical axis 11C. The image of the subject formed on the light receiving surface 13a of the image sensor 13 by the imaging optical system 11 is converted into an electric signal and taken into a microcomputer 15 built in the camera body.
[0024]
The microcomputer 15 includes a memory for storing programs and data, a central processing unit (microcomputer) that operates according to the program stored in the memory, an analog-digital (AD) converter, and the like.
[0025]
The digital still camera also detects angular velocities around two axes, an axis x orthogonal to the optical axis 11C and an axis y orthogonal to the optical axis and orthogonal to the axis x , as shown in the figure. An x-axis angular velocity sensor 17ax and a y-axis angular velocity sensor 17ay that output a detection signal corresponding to the magnitude of the detected angular velocity, and an x-axis sensor amplifier 17bx and a y-axis sensor that amplify the detection signal output from each angular velocity sensor to a predetermined level. And an amplifier 17by, which are built in the camera body.
[0026]
The x-axis angular velocity sensor 17ax and the x-axis sensor amplifier 17bx detect the x-axis angular velocity detection means 17x that detects the angular velocity around the axis x, and the y-axis angular velocity sensor 17ay and the y-axis sensor amplifier 17by detect the angular velocity around the axis y. Each of the y-axis angular velocity detection means 17y is configured, and as a whole, the axis x (first) direction orthogonal to the optical axis of the imaging optical system, the optical axis of the imaging optical system, and the axis x direction are orthogonal. A shake detection unit is configured to detect a shake in two directions with respect to the axis y (second) direction and to output a detection signal corresponding to the detected magnitude of the shake in the two directions.
[0027]
The microcomputer 15 digitally converts detection signals corresponding to the detected angular velocities output by the x-axis angular velocity detection means 17x and the y-axis angular velocity detection means 17y at a predetermined sampling period, and integrates the acquired detection signals. Thus, the “tilt angle due to shake” of the camera for each axis is calculated. Subsequently, based on the calculated inclination angle, the microcomputer 15 determines the movement amount of the image formed on the light receiving surface 13a of the image sensor 13 in the axis x direction and the axis y direction on the light receiving surface 13a. Based on the angular velocities detected by the x-axis angular velocity detecting means 17x and the y-axis angular velocity detecting means 17y, the displacement amounts for respectively displacing the imaging position on the light receiving surface in two directions by the calculated movement amounts are obtained. And calculate. In this way, the microcomputer 15 constitutes a calculation unit that drives the shake correction unit to determine the displacement amount for displacing the imaging position on the light receiving surface in two directions, respectively, based on the detection signal.
[0028]
The calculation of the displacement amount by the microcomputer 15 is the amount of movement of the image on the light receiving surface 13a caused by the inclination of the camera by the inclination angle calculated for each axis, that is, the axis x of the image forming position on the light receiving surface 13a. It is obtained by calculating the amount of movement in the direction and the axis y direction.
[0029]
The digital still camera also moves the light receiving surface 13a of the image sensor 13 independently in the axis x direction and the axis y direction based on the calculated displacement amount in the axis x direction and the axis y direction. The x-direction correction actuator 19ax and the y-direction correction actuator 19ay that return the image forming position that has moved to the original position, and the x-direction correction drive circuit 19bx and the y-direction correction drive circuit that drive the x-direction correction actuator 19ax and the y-direction correction actuator 19ay, respectively. 19by, and these are built in the camera body. The x-direction correction actuator 19ax and x-direction correction drive circuit 19bx the x direction stabilization means 19x, y-direction correction actuator 19ay and y-direction correction drive circuit 19by constitute respectively the y-direction blur correction unit 19y, as a whole, axis x And a shake correction means for independently displacing the imaging position on the light receiving surface in the direction and the axis y direction.
[0030]
The microcomputer 15 also operates the x-direction shake correction unit 19x and the y-direction shake correction unit 19y based on the calculated displacement amount for shake correction, and the imaging position moved on the light receiving surface 13a due to the shake is restored. The correction driving operation for returning to the position is controlled. Therefore, the microcomputer 15 takes in the detection signal output by the shake detection means, and corrects the image shake due to the shake by displacing the imaging position on the light receiving surface in the x-axis direction and the y-axis direction based on the taken-in detection signal. Thus, it functions as drive control means for driving and controlling the shake correction means.
[0031]
The digital still camera further includes a switch (not shown) that is turned on and off by an operation of a shake correction button 21 provided on the outside of the camera body as selection means for selecting whether to operate or stop the shake correction function. A zoom control unit 23A and a focus control unit 23B that control the zoom and focus by driving the zoom lens 11A and the focus lens 11B as imaging lenses are included in the camera body.
[0032]
The microcomputer 15 also has a zoom operation button 25A and a release operation button 25B provided outside the camera body, in addition to a process for shake correction performed based on a signal of a switch (not shown) that is turned on / off by the operation of the shake correction button 21. Based on this operation, other processes such as zoom driving and focus driving of the zoom lens 11A and the focus lens 11B of the imaging optical system 11 are performed via the zoom control unit 23A and the focus control unit 23B, respectively.
[0033]
Further, the microcomputer 15 can record information related to shooting by voice in the voice recording unit 23C by turning on the recording operation button 25C. For this purpose, the voice recording unit 23C has a microphone and a recording memory as a recording medium, performs a process of digitally converting and inputting the voice input inputted to the microphone, and writing this into the recording memory. Various recording memories are conceivable. The recording memory can be recorded using a part of the image recording memory for recording a captured image, or can be recorded in a separate memory.
[0034]
In the above configuration, in the normal shake correction when the shake correction function is activated by turning on the shake correction button 21, the microcomputer 15 and the optical axis 11 </ b> C of the imaging optical system 11 with respect to the image sensor 13 and 2 orthogonal to each other. When vibration occurs around one axis x and y, the x-axis angular velocity sensor 17ax and the x-axis angular velocity detector 17x including the x-axis sensor amplifier 17bx, and the y-axis including the y-axis angular velocity sensor 17ay and the y-axis sensor amplifier 17by. Detection signals corresponding to the angular velocities generated by the angular velocity detection means 17y are digitally converted and captured at a first predetermined sampling period. Then, the microcomputer 15 detects the tilt angle based on the acquired detection signal, and calculates the shake amount and the displacement amount for correcting the shake based on the tilt angle.
[0035]
Further, the microcomputer 15 outputs a drive signal to the correction drive circuits 19bx and 19by of the shake correction means 19x and 19y based on the calculated displacement amount for shake correction and drives the correction actuators 19ax and 19ay. Let The driven correction actuators 19ax and 19ay move the imaging device 13 in a plane orthogonal to the optical axis 11C to perform a shake correction operation in the horizontal direction that is the x-axis direction and the vertical direction that is the y-axis direction.
[0036]
In addition, when the recording operation button 25C is turned ON during this time, the microcomputer 15 performing the shake correction operation digitally converts and captures audio information regarding shooting input through the microphone in the audio recording unit 23C. The process of writing this in the recording memory is performed. At this time, the process for the shake correction operation is temporarily changed.
[0037]
That is, until the recording operation button 25C is turned ON, the microcomputer 15 always performs normal processing of angular velocity detection, shake amount calculation, displacement amount calculation for shake correction, and shake correction drive. When the operation button 25C is turned on, a detection signal corresponding to the angular velocity generated by the y-axis angular velocity detecting means 17y that has been digitally converted and captured at the same first predetermined sampling cycle is output to the first predetermined sampling cycle. The digital conversion is performed at a second predetermined sampling period longer than the predetermined sampling period. That is, the sampling period at which the microcomputer 15 takes in the detection signal indicating the shake in each direction can be set individually for each direction.
[0038]
Thus, the microcomputer 15 performs the angular velocity detection around the y-axis, the horizontal shake amount calculation, the displacement amount calculation for shake correction, and the shake correction drive processing at a cycle longer than the normal processing. As a result, when performing voice recording, the shake correction means 19x and 19y change the period at which the imaging position on the light receiving surface is displaced in the axis x direction and the axis y direction.
[0039]
By the way, shake correction is to prevent blurring of the image due to camera shake at the time of exposure, but when camera shake is analyzed, the camera shape and form, for example, large in the case of camera shake due to the release operation, are analyzed. Now, with different cameras such as weight, release button position, operation feeling, etc., we have come to recognize that there is a direction in how easy it is to get up. For example, it has been found that hand shake is likely to occur in the pushing direction of the release button, but shake is less likely to occur in the direction orthogonal to the pushing direction, and the amount of shake is small even if it occurs.
[0040]
When the camera shake has directionality as described above, it is not always necessary to perform the same correction operation in any direction, so the shake correction cycle in the direction with a small shake amount is lengthened. However, there is no problem even if the control accuracy is once lowered. Rather, in one direction, if the period of shake correction operation is temporarily increased, the processing load on the microcomputer 15 can be reduced. Therefore, when recording information related to shooting, the direction of the shake is made to correspond. By changing the correction operation, it is possible to perform voice recording at the time of shooting without increasing the cost and without substantially impairing the accuracy of shake correction.
[0041]
The outline of the digital still camera with a shake correction function has been described above, and details thereof will be described below with reference to the flowchart of FIG.
[0042]
The microcomputer 15 starts the shake correction process when the shake correction button 21 is turned on, and both the periods Txs and Tys for sampling the detection signals corresponding to the angular velocities generated by the x-axis angular velocity detection means 17x and the y-axis angular velocity detection means 17y, respectively. The first cycle T1 is set (step S1), and the drive control process is performed in the first sampling cycle T1 (step S2). If the recording operation button 25C is turned on during this drive control process (YES in step S3), the period Txs for sampling the detection signal corresponding to the angular velocity generated by the x-axis angular velocity detector 17x is left as it is. The cycle Tys for sampling the detection signal corresponding to the angular velocity generated by the y-axis angular velocity detector 17y is changed to a second cycle T2 longer than the first cycle T1 (step S4). The tilt angle is detected based on a detection signal corresponding to the angular velocity generated by the y-axis angular velocity detecting means 17y, and the shake amount and the displacement amount for shake correction based on the tilt angle are determined on the light receiving surface. This is to correct the horizontal shake of the imaging position, but the horizontal direction is perpendicular to the release push direction and is extremely small compared to the vertical shake, so even if the sampling period is long There are few problems in terms of correction accuracy.
[0043]
Thereafter, the recording operation button 25C is turned off (until NO in step S3), and again, the sampling period corresponding to the angular velocity generated by the x-axis angular velocity detector 17x and the y-axis angular velocity detector 17y is sampled again. Until both Txs and Tys are set to the first cycle T1 (step S1), the cycles Txs and Tys for sampling the detection signals corresponding to the angular velocities generated by the x-axis angular velocity detector 17x and the y-axis angular velocity detector 17y, respectively. The drive control process is performed with the first cycle T1 and the second cycle T2 (step S2).
[0044]
In this way, by increasing the sampling signal of the detection signal, the frequency of the angular velocity that is sampled and captured is reduced, the number of times that the displacement amount is calculated based on the captured angular velocity is small, and based on the calculated displacement amount. The period for driving and controlling the shake correction means to lengthen the image forming position on the light receiving surface in two directions to correct the image shake due to the shake becomes longer. Therefore, the period at which the shake correction means displaces the image forming position on the light receiving surface in the axis x direction and the axis y direction is different from each other. In addition, voice recording can be performed without substantially losing the accuracy of shake correction.
[0045]
When the cycle Tys for sampling the detection signal according to the angular velocity generated by the y-axis angular velocity detector 17y is changed to the second cycle T2 longer than the first cycle T1, in the drive control process (step S2), At the same time, simplification of the calculation formula for detecting the tilt angle based on the detection signal corresponding to the angular velocity captured by this sampling and calculating the shake amount and the displacement amount for correcting the shake based on the tilt angle is also performed. Can be done (in parentheses in step S4). In this case, in the drive control process, the burden of calculating the displacement amount is reduced accordingly.
[0046]
Regarding the simplification of the above-described arithmetic expression, the calculation of the displacement amount will be outlined below. The calculation for calculating the amount of displacement for shake correction is not a simple calculation in which the amount of displacement is simply calculated from the inclination angle by the angular velocity detection means, but linear and nonlinear characteristics due to the mechanism of the shake correction drive means. There is also a demand for calculation to correct, and the correction calculation time tends to increase. For example, as a prediction calculation to be introduced to correct the mechanical operation delay of the touch correction driving means, a calculation of the following formula is required at least as a simple linear form.
[0047]
Now, as shown in FIG. 3, assuming that the displacement amount after prediction is V [i], the displacement amount before prediction is v [i], the prediction time is t, and the time interval of shake data used for prediction is Δt. The subsequent displacement amount V [i] is calculated by the calculation of the following equation (1).
V [i] = v [i] + va [i] × t + vaa [i] × t ² + vaaa [i] × t ³ (1)
va [i] = (v [i] -v [i-1]) / [Delta] t (1-1)
vaa [i] = (va [i] -va [i-1]) / Δt (1-2)
vaaa [i] = (vaa [i] −vaa [i−1]) / Δt (1-3)
However, considering that the amount of shake in the horizontal direction is extremely small compared to the shake in the vertical direction, the influence of the mechanical operation delay of the shake correction drive means on the image shake is extremely small in the horizontal direction where the shake is small. I can say that. In FIG. 3, Δt1 is a vertical direction correction cycle, and Δt2 is a horizontal direction correction cycle.
[0048]
For this reason, in the horizontal direction where the shake is small, it is meaningless to make the accuracy of correcting the mechanical operation delay of the shake correction drive means the same as in the vertical direction where the shake is large. Further, in each term from the first order (coefficient is formula 1-1) to the third order (coefficient is formula 1-3) in formula 1, the higher the higher order term, the more calculation processing is performed. Note that the effect of prediction accuracy is greater in the low-order terms.
[0049]
Therefore, in the horizontal direction where the shake is small, even if the calculation formula that does not perform the calculation of the high-order term in the prediction calculation formula (1) is simplified, the influence on the image shake correction accuracy is extremely small, and the entire drive control process is performed. The burden of calculating the amount of displacement at is greatly reduced.
[0050]
【The invention's effect】
As described above, according to the first aspect of the present invention, when voice recording is performed, the first direction orthogonal to the optical axis of the imaging optical system and the optical axis of the imaging optical system temporarily, In addition, the processing for determining the displacement amount for shake correction is simplified by changing the correction operation in the direction in which the shake is difficult to occur among the two directions of the first direction and the second direction orthogonal to the first direction. Since the processing for driving and controlling the correction means is reduced, the processing load on the microcomputer is reduced , and voice recording at the time of shooting can be performed without increasing the cost and without substantially impairing the accuracy of shake correction.
[0052]
According to the invention of claim 2 Symbol placement, temporarily making a voice recording, since changing the period for capturing a detection signal to a long period, minutes of the period for taking the detection signal becomes longer, the amount of displacement and the prediction computation determining the load further Herase can further reduce the processing load of the microcomputer.
[0054]
According to the invention of claim 3 Symbol placement, without compromising the accuracy of the release push during blur correction substantially perform the sound recording at the time of shooting.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a schematic configuration of a camera body in an embodiment of an imaging apparatus with a shake correction function according to the present invention.
2 is a flowchart showing processing performed by the microcomputer in FIG. 1 in the embodiment of the imaging apparatus with a shake correction function according to the present invention.
FIGS. 3A and 3B are explanatory diagrams for explaining a prediction calculation method introduced to correct a mechanical operation delay, in which FIG. 3A shows a vertical shake waveform, and FIG. 3B shows a horizontal shake waveform.
[Explanation of symbols]
11 photographing optical system 11C optical axis 13 imaging element 13a light receiving surface 15 microcomputer (drive control means, calculation means)
17x, 17y shake detection means (angular velocity detection means)
19x, 19y Shake correction means 21 Shake correction button 23C Voice recording unit 25C Recording operation button x, y axis

Claims (3)

To form an image of a subject on a light receiving surface of the imaging device by the imaging optical system, fetches into an electric signal, the information on imaging recorded by audio, imaging to correct the image blur on the light receiving surface a imaging device which is to perform,
A shake in a first direction orthogonal to the optical axis of the imaging optical system and a second direction orthogonal to the optical axis of the imaging optical system and orthogonal to the first direction is detected, and the detected 2 Shake detection means for outputting a detection signal corresponding to the magnitude of shake in one direction,
Shake correcting means for independently displacing the imaging position on the light receiving surface in the first direction and the second direction;
The detection signal output from the shake detection unit is periodically fetched, and the shake correction unit is driven based on the fetched detection signal to set the imaging position on the light receiving surface in the first direction and the second direction. Calculating means for determining the amount of displacement to be displaced in each direction by predicting and calculating from a predictive calculation formula including a high-order term,
Based on the amount of displacement determined by the calculation means, the shake correction means is periodically moved so as to correct the image shake due to the shake by displacing the imaging position on the light receiving surface in the first direction and the second direction. A drive control means for controlling the drive automatically,
When the voice recording is performed, the calculation means temporarily calculates the prediction calculation formula that predicts and determines the displacement amount in a direction in which vibration is unlikely to occur between the first direction and the second direction. It is changed to a simplified prediction calculation formula that does not include a high-order term, and the drive control means changes a period for displacing the imaging position on the light receiving surface in a direction in which the shake is difficult to occur, to a long period. It is that imaging device. When performing the voice recording, the calculation means temporarily sets a period for taking in the detection signal corresponding to a shake in a direction in which the shake is difficult to occur in the first direction and the second direction in the other direction. imaging device according to claim 1, wherein the change in a period longer than the period of capturing the detection signal against the. The resulting hard the direction of deflection is an imaging apparatus according to claim 1 or 2, wherein the a direction perpendicular to the release push-in direction.

Images