JP2003255425A - Image pickup device with shake correcting function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image pickup device with a shake correcting function capable of recording sound at the time of photographing without increasing costs and without practically damaging the accuracy of the shake correction by changing a correcting operation corresponding to the direction of a shake. <P>SOLUTION: A shake detection means 17x and 17y detect the shake in two directions orthogonal to each other and the optical axis 11C of a photographing optical system 11 and respectively output detection signals corresponding to the size of the shake in two directions and shake correction means 19x and 19y independently displace an image forming position on a light receiving plane in two directions. A microcomputer 15 constituting a drive control means fetches detection signals and controls the drive of the shake correction means so as to correct an image shake due to the shake by displacing the image forming position on the light receiving plane in two directions on the basis of the fetched detection signals. Also, the drive control means makes the cycles of displacing the image forming position on the light receiving plane in two directions by the shake correction means be different from each other at the time of recording the sound. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image pickup apparatus having a shake correction function, and more specifically, it forms an image of a subject on a light receiving surface of an image pickup element by a photographing optical system, converts it into an electric signal, and takes it in. At the same time, for example, the present invention relates to an image pickup apparatus with a shake correction function, which corrects image shake on the light-receiving surface caused by camera shake during shooting so that the effect of the shake on shooting is minimized.

[0002]

2. Description of the Related Art Conventionally, an image pickup apparatus of this type is known as a video camera or a digital still camera. For example, in the case of a digital still camera, a silver salt is used due to the limit of sensitivity of an image pickup device composed of a CCD (charge coupled device). It is difficult to realize a short shutter time like a photograph, and blurring such as "image flow" is likely to occur in an image captured by camera shake.

In shake correction, the angular velocity around two fixed axes that are orthogonal to the optical axis of the camera is usually detected, the "tilt angle due to shake" of the camera around these two axes is calculated, and this tilt angle is dealt with. The correction lens included in the photographing optical system is displaced, the direction of the optical axis is adjusted, and the image pickup device is moved so as to correct the image blur. The element has a mechanism that moves in two axial directions.

In general, as a mechanism for correcting image blur, a correcting member that independently corrects image blur caused by movement of the image forming position on the light receiving surface in two different directions orthogonal to the optical axis of the camera. And a microcomputer (hereinafter, referred to as a microcomputer) detects the shake amount in each of two directions by the output of a shake detection sensor such as an angular velocity sensor,
On the basis of the detected shake amount, the correction member displaces the image forming position on the light receiving surface in two directions so as to eliminate the image shake.

More specifically, in order to detect the shake amount in two directions by the detection output of the shake detecting sensor, the microcomputer digitally converts the analog electric signal as the sensor output in the first predetermined sampling period and fetches it. , The amount of shake is detected by the captured digital value. next,
The displacement amount corresponding to the detected shake amount in each direction is calculated, and a drive signal for driving the actuator that constitutes the correction member so as to displace the image forming position on the light receiving surface by an amount corresponding to this displacement amount is applied to the actuator. Is output to eliminate the image shake that may occur in each direction due to the camera shake.

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 forming position, or an image is formed in an electronic camera. Any image pickup device such as a CCD image pickup device that can change the image forming position may be used. Then, the above-described correction operation from the acquisition of the sensor output to the driving of the correction member is similarly performed for the shake in any direction.

In general, a camera of this type generally uses O for shake correction.
An N / OFF mode is provided, 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 operation, the shake of the camera is always detected in each angular velocity sensor, the amount of displacement for shake correction is calculated based on the detected shake, and the correction means is driven. It is done with a microcomputer.

[0008]

By the way, the correction operation of the correction member must be performed as faithfully as possible to the output change of the sensor for detecting the shake and with good followability. To this end, the sampling cycle for capturing the sensor output by the microcomputer is shortened as much as possible, and the drive signal that the microcomputer outputs to the actuator that constitutes the correction member and determines the displacement amount for shake correction is changed with the smallest possible gradation. In order to realize more accurate shake correction, the microcomputer is required to have high-speed processing capability.

In addition, in the case of an image pickup apparatus having an additional function of voice recording for recording information relating to the photographing by voice and leaving it as a memo at the time of photographing, the microcomputer incorporated therein generally performs shake correction. In addition, in order to record the voice information, it is necessary to convert the voice signal into a digital signal, capture the digital signal, and record the digital signal in a recording medium. Therefore, the burden on the microcomputer becomes heavier and more, and in order to perform even quicker shooting, a microcomputer capable of higher-speed processing is required, which has been a major factor in cost increase.

Therefore, in view of the above-mentioned point, the present invention changes the correction operation corresponding to the shake direction at the time of voice recording the information regarding the photographing, thereby increasing the accuracy of the shake correction without increasing the cost. It is an object of the present invention to provide an image pickup apparatus with a shake correction function, which is capable of performing voice recording at the time of shooting without substantially impairing the above.

[0011]

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 element by a photographing optical system and converts it into an electric signal. An image pickup apparatus with a shake correction function, which captures information about the shooting by voice, and corrects image shake on the light-receiving surface due to shake to perform shooting, and an optical axis of the shooting optical system. And shake detecting means for detecting shakes in two directions orthogonal to each other and outputting detection signals according to the detected shakes in the two directions, and an image forming position on the light-receiving surface in the two directions independently. A shake correction unit for displacing the image pickup device and a detection signal output from the shake detection unit, and based on the received detection signal, the image forming position on the light receiving surface is displaced in the two directions, thereby causing image shake due to shake. Drive control means for drivingly controlling the shake correction means so that the shake correction means corrects the image formation position on the light receiving surface in the two directions when performing the voice recording. The image pickup device with a shake correction function is characterized in that the periods for displacing it are different from each other.

According to the above-mentioned constitution of claim 1, the shake detecting means is orthogonal to the optical axis of the photographing optical system.
The shakes in the two directions are detected and the detection signals corresponding to the magnitudes of the shakes in the two directions are output respectively, and the shake correcting means independently displaces the image forming positions on the light receiving surface in the two directions.
The drive control means fetches the detection signal, and based on the fetched detection signal, drives the shake correction means so as to displace the image forming position on the light receiving surface in two directions to correct the image shake due to the shake. In addition, the drive control means is configured such that, when voice recording is performed, the shake correcting means makes the periods at which the image forming position on the light receiving surface is displaced in two directions different from each other. Therefore, when there is a direction in which shake easily occurs and a direction in which shake does not easily occur, the cycles can be made different from each other in accordance with the directionality of shake, for example.

According to a second aspect of the present invention, in the image pickup apparatus with the shake correcting function according to the first aspect, the drive control means drives the shake correcting means to set the image forming position on the light receiving surface to the image forming position. A displacement amount to be displaced in each direction based on the detection signal, and the shake correction unit moves the image forming position on the light receiving surface in the two directions by the displacement amount determined by the arithmetic unit. An imaging device with a shake correction function is characterized in that the periods of displacement are different from each other.

According to the second aspect of the present invention, the drive control means detects the displacement amount by which the arithmetic means included in the drive control means drives the shake correction means to displace the image forming positions on the light receiving surface in two directions. The shake correcting means changes the cycle of displacing the image forming position on the light receiving surface in the two directions by the determined displacement amount. Therefore, it is possible to make the cycles different from each other by changing the cycle in which the computing unit determines the displacement amount in each of the two directions based on the detection signal, for example, in accordance with the directionality of the shake.

According to a third aspect of the present invention, in the image pickup apparatus with a shake correction function according to the first or second aspect, the drive control means changes the cycle of intermittently capturing the detection signal in the two directions, and An image pickup device with a shake correction function is characterized in that the period is different.

According to the third aspect of the present invention, the drive control means changes the period for intermittently taking in the detection signal in two directions so that the image forming position on the light receiving surface is displaced in two directions so that the periods are different from each other. Therefore, it is possible to make the cycles different from each other by changing the cycle for intermittently capturing the detection signal in accordance with the directionality of the shake.

According to a fourth aspect of the present invention, in the image pickup apparatus with a shake correction function according to the second or third aspect, the drive control means, when the cycle is different, the arithmetic means outputs the detection signal. An imaging device with a shake correction function is characterized in that a calculation formula for determining the displacement amount based on the above is simplified.

According to the structure described in claim 4, when the drive control means changes the cycle of displacing the image forming position on the light receiving surface in two directions, the calculating means determines the displacement amount based on the detection signal. Since the calculation formula is simplified, the process for determining the displacement amount can be simplified in addition to the period of displacement.

According to a fifth aspect of the present invention, in the image pickup apparatus with a shake correction function according to any one of the first to fourth aspects, the two directions correspond to the direction of shake, and the directionality of the shake is release. An image pickup apparatus with a shake correction function is characterized in that it matches the pushing direction.

According to the fifth aspect of the invention, since the two directions correspond to the directional characteristics of the shake that coincides with the release pushing direction, it is possible to make the cycle in the direction of the small shake longer than before. it can.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an embodiment of an image pickup apparatus according to the present invention, and schematically shows a schematic configuration of a digital still camera with a shake correction function.

In FIG. 1, a digital still camera with a shake correction function is a photographing optical system 1 built in a camera body.
By 1, the image of the subject is formed on the light receiving surface 13a of the image sensor 13 also built in the camera body, converted into an electric signal and taken in, and the image blur caused by camera shake during photographing is corrected, The shake is configured so that the influence on the shooting is minimized.

Specifically, the photographing optical system 11 includes a zoom lens 11A and a focus lens 1 as image pickup lenses.
1B, and the image pickup device 13 is arranged on the optical axis 11C thereof. The image of the subject formed on the light receiving surface 13a of the image pickup device 13 by the image pickup optical system 11 is converted into an electric signal and taken into a microcomputer 15 incorporated in the camera body.

The microcomputer 15 includes a memory for storing programs and data, a central processing unit (microcomputer) that operates according to a program stored in the memory, and an analog
It is composed of a digital (AD) converter and the like.

The digital still camera also has an optical axis 11C.
Two axes x and y that are orthogonal to and orthogonal to each other
The x-axis angular velocity sensor 17ax and the y-axis angular velocity sensor 17ay, which detect the angular velocities around the respective axes and output detection signals according to the magnitude of the detected angular velocities, and the detection signals output by the respective angular velocity sensors are amplified to a predetermined level. Do x
Axis sensor amplifier 17bx and y-axis sensor amplifier 17b
y, which are built into the camera body.

The x-axis angular velocity sensor 17ax and the x-axis sensor amplifier 17bx detect the angular velocity around the axis x.
The axial angular velocity detecting means 17x is replaced by the y-axis angular velocity sensor 17ay.
The y-axis sensor amplifier 17by constitutes a y-axis angular velocity detecting means 17y for detecting an angular velocity around the axis y, and as a whole, detects an optical axis of the photographing optical system and shakes in two directions orthogonal to each other, and detects the shake. A shake detection unit that outputs a detection signal corresponding to the magnitude of the shake in the two directions is configured.

The microcomputer 15 uses the x-axis angular velocity detecting means 17
The detection signals corresponding to the detected angular velocities output by the x- and y-axis angular velocity detection means 17y are digitally converted at a predetermined sampling period and are respectively captured, and the captured detection signals are integrated to determine the camera "for each axis. The tilt angle due to shake "is calculated. Then, microcomputer 1
The reference numeral 5 indicates, based on the calculated tilt angle, the amount of movement of the image formed on the light receiving surface 13a of the image pickup device 13 in the axis x direction and the axis y direction on the light receiving surface 13a by a predetermined calculation formula. Then, the displacement amount for displacing the image forming position on the light receiving surface in each of the two directions by the calculated movement amount is calculated based on the angular velocities detected by the x-axis angular velocity detecting means 17x and the y-axis angular velocity detecting means 17y. As a result, the microcomputer 15 constitutes an arithmetic means that drives the shake correcting means and determines the displacement amounts for displacing the image forming positions on the light receiving surface in the two directions based on the detection signals.

The displacement amount calculated by the microcomputer 15 is the amount of movement of the image on the light receiving surface 13a caused by the camera tilting by the tilt angle calculated for each axis, that is, the image forming position on the light receiving surface 13a. Axis x direction and axis y
It is obtained by calculating the amount of movement in the direction.

The digital still camera also uses the image pickup device 1 based on the calculated displacement amounts in the x-axis direction and the y-axis direction.
The x-direction correction actuator 19ax and the y-direction correction actuator 19ay for independently moving the light-receiving surface 13a of No. 3 independently in the x-axis direction and the y-axis direction and returning the imaging position moved on the light-receiving surface 13a by the shake to the original position. An x-direction correction drive circuit 19 for driving the direction correction actuator 19ax and the y-direction correction actuator 19ay, respectively.
It has a bx and y direction correction drive circuit 19by, which are built in the camera body. The x-direction correction actuator 19ax and the x-direction correction drive circuit 19bx are x
The y-direction correction actuator 19ay and the y-direction correction driving circuit 19by respectively constitute the y-direction shake correction means 19y, and the y-direction shake correction means 19x constitutes the y-direction shake correction means 19y. A shake correction means for independently displacing the image forming position of is formed.

The microcomputer 15 also operates the x-direction shake compensating means 19x and the y-direction shake compensating means 19y based on the calculated displacement amount for shake compensation, and forms an image on the light receiving surface 13a due to the shake. The correction driving operation for returning the position to the original position is controlled. Therefore, the microcomputer 15
Drive for fetching the detection signal output from the shake detecting means and drivingly controlling the shake correcting means so as to correct the image shake due to the shake by displacing the image forming position on the light receiving surface in two directions based on the fetched detection signal. Acts as a control means.

The digital still camera further includes a switch (not shown) which is turned on / off by operating a shake correction button 21 provided on the outside of the camera body as a selection means for selecting whether to activate or stop the shake correction function. As an imaging lens of the system 11, there are a zoom control unit 23A and a focus control unit 23B that drive the zoom lens 11A and the focus lens 11B to control zoom and focus, respectively, and these are built in the camera body.

The microcomputer 15 also has a shake correction button 21.
In addition to the processing for shake correction performed based on the signal of a switch (not shown) that is turned on and off by the operation of, the zoom control unit is operated based on the operation of the zoom operation button 25A and the release operation button 25B provided outside the camera body. 23A and the focus control unit 23B, the zoom lens 11A and the focus lens 1 of the imaging optical system 11
Other processes such as zoom driving and focus driving of 1B are also performed.

The microcomputer 15 is further provided with a recording operation button 2
By the ON operation of 5C, the audio recording unit 23C can record the information relating to shooting by voice.
For this purpose, the voice recording unit 23C has a microphone and a recording memory as a recording medium, performs a process of digitally capturing a voice input input to the microphone and writing the voice input to the recording memory. Various types of recording memory are conceivable. In addition to recording by using a part of the image recording memory for recording the captured image,
It is also possible to record in a separate memory.

With the above construction, the shake correction button 21
In normal shake correction when the shake correction function is activated by turning on, the microcomputer 15 causes shake about the optical axis 11C of the photographing optical system 11 with respect to the image sensor 13 and two axes x and y orthogonal to each other. Occurs, x
An x-axis angular velocity detection means 17x including an axial angular velocity sensor 17ax and an x-axis sensor amplifier 17bx, and a y including a y-axis angular velocity sensor 17ay and a y-axis sensor amplifier 17by.
The detection signals corresponding to the angular velocities respectively generated by the shaft angular velocity detection means 17y are digitally converted at the first predetermined sampling period and fetched. Then, the microcomputer 15 detects the tilt angle based on the fetched detection signal, and calculates the shake amount and the displacement amount for shake correction corresponding thereto based on the tilt angle.

Further, the microcomputer 15 determines the shake correction means 19 based on the calculated displacement amount for shake correction.
Driving signals are output to the correction driving circuits 19bx and 19by for x and 19y to correct the correction actuators 19ax and 1ax.
Drive 9ay. Driven correction actuator 1
9ax and 19ay move the image sensor 13 in a plane orthogonal to the optical axis 11C, and perform shake correction operations in the horizontal direction that is the x-axis direction and the vertical direction that is the y-axis direction.

Further, when the recording operation button 25C is turned ON during this period, the microcomputer 15 which is performing the shake correction operation digitally converts the audio information regarding the photographing input through the microphone in the audio recording section 23C. The process for capturing and writing this in the recording memory is performed. At this time, the process for the shake correction operation is temporarily changed.

That is, the microcomputer 15 constantly performs normal processing of angular velocity detection, shake amount calculation, displacement amount calculation for shake correction, and shake correction drive until the recording operation button 25C is turned on. However, when the recording operation button 25C is turned on, the first detection signal corresponding to the angular velocity generated by the y-axis angular velocity detection means 17y, which has been digitally converted and captured in the same first predetermined sampling period, is displayed. Second longer than the predetermined sampling period
It is changed so as to be digitally converted and taken in at a predetermined sampling period of That is, the sampling period for the microcomputer 15 to capture the detection signal indicating the shake in each direction can be set individually for each direction.

As a result, the microcomputer 15 executes the angular velocity detection around the y-axis, the shake amount calculation in the horizontal direction, the displacement amount calculation for shake correction, and the shake correction driving process in a cycle longer than the normal process. And as a result,
Shake correction means 19x and 19y when recording voice
Changes the cycle of displacing the image forming position on the light receiving surface in two directions.

By the way, the shake correction is for preventing the blurring of the image due to the shake of the camera at the time of exposure. When the shake of the camera is analyzed, in the case of the shake caused by the release operation, the shape and form of the camera However, it has come to be recognized that the easiness of getting up has a direction by using cameras having different sizes, weights, positions of the release buttons, operation feelings, and the like. For example, camera shake is likely to occur in the pushing direction of the release button, but in the direction orthogonal to the pushing direction,
It was found that shakes were less likely to occur and that the amount of shakes was small.

When the camera shake is directional in this way, it cannot be said that it is necessary to perform the same correction operation in any of the directions. Even if the cycle is lengthened and the control accuracy is once lowered, there is no inconvenience. Rather, even if it is in one direction, the microcomputer 1
Since it becomes possible to reduce the processing load of No. 5, by changing the correction operation according to the direction of the shake when recording the information about the shooting by voice, the accuracy of the shake correction can be improved without increasing the cost. The voice recording at the time of shooting can be performed substantially without any loss.

The outline of the digital still camera with the shake correction function has been described above. The details will be described below with reference to the flowchart of FIG. 2 showing the processing performed by the microcomputer 15.

The microcomputer 15 turns on the shake correction button 21
The shake correction process is started by N, and the cycle T for sampling the detection signals corresponding to the angular velocities generated by the x-axis angular velocity detecting means 17x and the y-axis angular velocity detecting means 17y, respectively.
Both xs and Tys are set to the first cycle T1 (step S1), and drive control processing is performed in this first sampling cycle T1 (step S2). When the recording operation button 25C is turned on during this drive control process (when step S3 is YES), the cycle Txs for sampling the detection signal corresponding to the angular velocity generated by the x-axis angular velocity detection means 17x is left unchanged. , Cycle Tys for sampling the detection signal corresponding to the angular velocity generated by the y-axis angular velocity detector 17y is changed to the second period T2 longer than the first period T1 (step S4). The tilt angle is detected based on the 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 corresponding thereto are determined on the light receiving surface based on the tilt angle. This is for correcting the horizontal shake of the image forming position, but since the horizontal direction is the direction orthogonal to the release pushing direction and is extremely smaller than the vertical shake, even if the sampling cycle becomes long. There are few problems in terms of correction accuracy.

After that, the recording operation button 25C is turned on.
It becomes FF (until step S3 becomes NO), and again
x-axis angular velocity detecting means 17x and y-axis angular velocity detecting means 1
Until the periods Txs and Tys for sampling the detection signals corresponding to the angular velocities generated by 7y are both set to the first period T1 (step S1), the x-axis angular velocity detecting means 17x and the y-axis angular velocity detecting means 17y respectively. The periods Txs and Tys for sampling the detection signal according to the generated angular velocity are set to the first period T1 and the second period.
Drive control processing is performed at the cycle T2 of
2).

By thus lengthening the sampling signal of the detection signal, the frequency of the angular velocities sampled and taken in decreases, the number of times the displacement amount is calculated based on the acquired angular velocities is small, and the calculated displacement amount is also small. Also, the period for driving and controlling the shake correcting means is lengthened so that the image forming position on the light receiving surface is displaced in two directions to correct the image shake due to the shake. Therefore, the shake correcting means makes the cycles of displacing the image forming position on the light receiving surface in two directions different from each other, so that the microcomputer 15 has a margin correspondingly, and the cost is not increased, and the accuracy of shake correction is high. The voice recording at the time of shooting can be performed without substantially damaging the.

The period Ty for sampling the detection signal corresponding to the angular velocity generated by the y-axis angular velocity detecting means 17y.
When s is changed to the second cycle T2 which is longer than the first cycle T1, in the drive control process (step S2), the tilt angle is detected based on the detection signal corresponding to the angular velocity captured by this sampling, The calculation formula for calculating the shake amount and the displacement amount for shake correction based on the tilt angle can be simplified at the same time (in parentheses in step S4). In this case, in the drive control process, the burden of calculating the displacement amount can be reduced accordingly.

Regarding the simplification of the above-mentioned arithmetic expression, the calculation of the displacement amount will be outlined below. As the calculation for calculating the displacement amount for shake correction, it is not a simple operation to simply calculate the displacement amount from the tilt angle by the angular velocity detecting means,
There is also a demand for calculation for correcting the linear and non-linear characteristics due to the mechanism of the shake correction drive means, and the correction calculation time tends to increase. For example, as a predictive calculation to be introduced in order to correct the mechanical operation delay of the touch correction driving means, at least the calculation of the following formula is necessary even in a simple linear form.

Now, as shown in FIG. 3, 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 the shake data used for prediction is Δt. Then, the predicted displacement amount V [i] is calculated by the calculation of the following expression (1). V [i] = v [i] + va [i] × t + vaa [i] × t ² + vaaa [i] × t ³ (1) va [i] = (v [i] −v [i-1]) / Δt (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 shake amount in the horizontal direction is extremely smaller than the shake in the vertical direction, in the horizontal direction in which the shake is small, the image shake due to a mechanical operation delay of the shake correction drive unit is caused. Can be said to have an extremely small effect. Note that FIG.
In the figure, Δt1 is a vertical correction cycle, and Δt2 is a horizontal correction cycle.

From this, it is meaningless to make the accuracy of correcting the mechanical operation delay of the shake correction drive means the same in the vertical direction where the shake is large in the horizontal direction where the shake is small. Further, in each term from the first-order (coefficients are equation 1-1) to the third-order (coefficients are equation 1-3) in the equation 1, the higher the number of terms, the more the arithmetic processing is performed. The influence of the prediction accuracy is greater in the low-order terms.

Therefore, in the horizontal direction where the shake is small, even if the calculation formula which does not perform the calculation of the higher-order terms in the prediction calculation formula (1) is simplified, the influence on the image shake correction accuracy is extremely small, and the driving is performed. The burden of calculating the displacement amount in the entire control process is greatly reduced.

[0050]

As described above, according to the first aspect of the present invention, the cycles can be made different from each other. For example, the cycles can be made different from each other according to the direction of the shake. , When recording information about shooting, by changing the correction operation corresponding to the shake direction, you can record the sound at the time of shooting without increasing the cost and without substantially impairing the accuracy of shake correction. You can do it.

According to the second aspect of the present invention, the calculation means changes the cycle for determining the displacement amount in each of the two directions based on the detection signal, for example, in accordance with the directionality of the shake, thereby making the cycles different from each other. Because it is possible to detect angular velocity,
It is possible to reduce the processing load on the microcomputer for displacement amount calculation for shake correction and shake correction driving.

According to the third aspect of the present invention, the cycle is made different from each other by changing the cycle at which the detection signal is intermittently taken in according to the directionality of the shake. It is possible to reduce the amount of displacement calculation and shake correction drive for shake correction performed according to the directionality of shake, for example, and reduce the processing load on the microcomputer.

According to the fourth aspect of the present invention, not only according to the displacement period, but also the process for determining the displacement amount can be simplified. Therefore, the shake correction drive corresponds to the directionality. The processing load on the microcomputer can be reduced.

According to the fifth aspect of the invention, since the two directions correspond to the directional characteristics of the shake that coincide with the release pushing direction, it is possible to make the cycle in the direction of the small shake longer than before. Therefore, it is possible to record a voice at the time of shooting without substantially impairing the accuracy of shake correction.

[Brief description of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a camera body in an embodiment of an image pickup apparatus with a shake correction function according to the present invention.

FIG. 2 is a flowchart showing a process performed by a microcomputer in FIG. 1 in an embodiment of an image pickup apparatus with a shake correction function according to the present invention.

3A and 3B are explanatory diagrams for explaining a method of predictive calculation 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 Shooting optical system 11C optical axis 13 Image sensor 13a light receiving surface 15 Microcomputer (drive control means, arithmetic means) 17x, 17y shake detection means (angular velocity detection means) 19x, 19y shake correction means 21 Shake correction button 23C voice recording section 25C recording operation button x, y axis

Claims (5)

[Claims] 1. An image of a subject is formed on a light receiving surface of an image pickup device by a photographing optical system, converted into an electric signal and taken in, information regarding photographing is recorded by voice, and the image on the light receiving surface is shaken. An image pickup apparatus with a shake correction function, which corrects image shake and performs shooting, wherein shakes in two directions orthogonal to the optical axis of the photographing optical system and each other are detected, and the detected shakes in two directions are detected. Shake detection means for respectively outputting a detection signal according to the height, shake correction means for independently displacing the image forming position on the light receiving surface in the two directions, and a detection signal output by the shake detection means, Drive control means for driving and controlling the shake correction means so as to correct the image shake due to shake by displacing the image forming position on the light receiving surface in the two directions based on the captured detection signal, Drive control means, when performing the voice recording, the shake vibration correction means, characterized in that different from each other periodically to displace the imaging position on the light receiving surface in the 2 direction correction function imaging apparatus. 2. The drive control means includes arithmetic means for driving the shake correction means to determine displacement amounts for displacing the imaging positions on the light receiving surface in the two directions, respectively, based on the detection signals. 2. The shake correction according to claim 1, wherein the shake correction means changes the cycle of displacing the image forming position on the light receiving surface in each of the two directions by the displacement amount determined by the calculation means. Imaging device with functions. 3. The drive control means changes the cycle of intermittently fetching the detection signal in the two directions, thereby changing the cycle of displacing the imaging position on the light receiving surface in the two directions. The image pickup apparatus with a shake correction function according to claim 1 or 2. 4. The drive control means, when the cycle is changed, the calculation means simplifies a calculation formula for determining the displacement amount based on the detection signal. An image pickup device with a shake correction function according to item 3. 5. The image pickup apparatus with a shake correction function according to claim 1, wherein the two directions correspond to a shake directionality that matches a release pushing direction.