JP2007122032A - Optical axis correction apparatus of imaging device and optical axis correction method for imaging device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical axis correction apparatus of an imaging device capable of easily correcting a deviation of an object image position in directions orthogonal to an optical axis due to the deviation in the direction orthogonal to the optical axis occurring when changing a relative position among a plurality of optical elements. <P>SOLUTION: The optical axis correction apparatus includes; an imaging optical system including an optical element position changing means 30 which changes the relative position among the plurality of optical elements to vary a state of an object image; an optical element shift means which actuates at least one of the plurality of optical elements in a plane orthogonal to the optical axis; a storage means 24 which prestores data relating to a deviation of the object image position caused by the deviation of the position in the directions orthogonal to the optical axis among the respective optical elements occurring when an optical element position changing means 31 changes the relative position among the plurality of optical elements; and an optical axis correction control means which corrects the deviation of the object image position by driving at least one of the plurality of optical elements on the plane orthogonal to the optical axis by the optical element shift means, based on the data relating to the deviation of the object image position stored in the storage means according to the operation state of the optical element position changing means. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical axis correction apparatus for an imaging device and an optical axis correction method for the imaging device.

  In an imaging device such as a camera, it is a very common operation to change the state (mainly magnification) of a subject image (captured image) by changing the mutual positional relationship between a plurality of optical elements. There are various operations for changing the subject image, and examples thereof include a zooming operation in a zoom lens, and an insertion / extraction operation on an optical axis of auxiliary optical elements such as a wide converter and a macro lens.

  By the way, when the mutual position of a plurality of optical elements is changed, a shift (eccentricity) in a direction perpendicular to the optical axis of the optical system, which is peculiar to each position, may occur. When such an optical axis shift occurs, the subject image position on the imaging screen moves in a direction substantially parallel to the optical axis (parallel to the imaging screen). However, it is very difficult to make such an optical axis shift zero by increasing the accuracy of the occurrence location.

  The present invention relates to an optical axis correction apparatus for an imaging apparatus that can easily correct a positional deviation of a subject image caused by a positional deviation in a direction perpendicular to the optical axis that occurs when the mutual positions of a plurality of optical elements are changed. It is another object of the present invention to provide an optical axis correction method for an imaging device.

  An optical axis correction apparatus for an imaging apparatus according to the present invention includes an imaging optical system including an optical element position conversion unit that changes the state of a subject image by changing the mutual positions of a plurality of optical elements, and among the plurality of optical elements. An optical element shift means for operating at least one in a plane orthogonal to the optical axis, and an optical axis between the optical elements generated when the mutual position of the plurality of optical elements is changed by the optical element position conversion means. The storage unit stores in advance data related to the positional deviation of the subject image due to the positional deviation in the direction orthogonal to the direction of the subject image, and the subject image stored in the storage unit according to the operation state of the optical element position converting unit. Based on the data related to the displacement, at least one of the plurality of optical elements is driven in a plane orthogonal to the optical axis by the optical element shifting means to compensate for the displacement of the subject image. It is characterized by having an optical axis correction control means for.

  The optical element position conversion means can be, for example, a zoom drive mechanism that changes the focal length by changing the optical axis direction interval of a plurality of optical elements positioned on the optical axis. Alternatively, the optical element position converting means may be an insertion / extraction drive mechanism that moves the insertion optical element to an insertion position on the optical axis and a position separated from the optical axis.

  The optical axis correction control means preferably executes the optical axis correction operation after the operation of the optical element position conversion means is completed.

  The optical element actuated in a plane perpendicular to the optical axis by the optical element shifting means can be, for example, an imaging sensor.

  Further, image blur correction control means for canceling image blur on the imaging surface by operating the optical element in a plane orthogonal to the optical axis by the optical element shift means according to the magnitude and direction of shake applied to the imaging device. It may be provided. In this case, the image blur correction function by the image blur correction control means can be turned on / off, and when the image blur correction function is on, the image blur correction control means takes into account the data stored in the storage means and the optical element shift means An optical element driving amount for image blur correction may be determined.

  The optical axis correction apparatus for an imaging apparatus according to the present invention also includes an imaging optical system including an optical element position conversion unit that changes the state of a subject image by changing the mutual positions of a plurality of optical elements, and a shake applied to the imaging optical system. According to the size and direction, image blur correction means for operating the blur correction optical element included in the plurality of optical elements in a plane orthogonal to the optical axis to cancel image blur on the imaging surface, and the optical element Data related to the positional deviation of the subject image due to the positional deviation in the direction orthogonal to the optical axis between the optical elements generated when the mutual position of the plurality of optical elements is changed by the position converting means is stored in advance. The data stored in the storage unit is read in accordance with the operation state of the storage unit and the optical element position conversion unit, and the image is corrected to the position where the image image correction unit corrects the positional deviation of the subject image. It is characterized by having an optical axis correction control means for driving the academic elements.

  According to another aspect of the present invention, there is provided an imaging optical system including an optical element position converting unit that changes a state of a subject image by changing a mutual position of a plurality of optical elements, and at least one of the plurality of optical elements. In an imaging apparatus including an optical element shift unit that operates in a plane orthogonal to the optical axis, an optical axis between the optical elements generated when the mutual position of the plurality of optical elements is changed by the optical element position conversion unit. Measuring a displacement amount of the subject image due to a displacement in a direction perpendicular to the direction, and calculating a drive amount of the at least one optical element that corrects the displacement of the subject image based on the measured displacement amount A step of storing the calculated drive amount in a storage unit in advance, and a drive amount stored in the storage unit in accordance with an operating state of the optical element position conversion unit Read, and characterized by the step of correcting the positional deviation of the object image is operated in a plane perpendicular to the optical axis of said at least one optical element by the optical element shifting means. An optical axis correction method for an imaging device.

  The present invention also provides an imaging optical system including an optical element position converting unit that changes the state of a subject image by changing the positions of a plurality of optical elements, and at least one of the plurality of optical elements is orthogonal to an optical axis. In an imaging apparatus including an optical element shift unit that operates in a plane that performs the same, a direction orthogonal to the optical axis between the optical elements generated when the mutual position of the plurality of optical elements is changed by the optical element position conversion unit Measuring the data related to the positional deviation of the subject image due to the positional deviation, and storing the data in the storage means in advance, and storing the data in the storage means according to the operating state of the optical element position conversion means The calculated data is read out, and a correction amount for correcting the positional deviation of the subject image is calculated by the optical element shifting means, and the optical element shifting means is calculated based on the correction amount. Said at least one optical element is operated in a plane perpendicular to the optical axis is characterized by the step of correcting the positional deviation of the object image I.

  According to the optical axis correction apparatus and the optical axis correction method of the present invention described above, it is easy to shift the position of the subject image in the direction perpendicular to the optical axis, which occurs when the mutual position of a plurality of optical elements is changed in the imaging device. Can be corrected.

FIG. 1 shows a digital camera 10 which is an embodiment of an imaging device according to the present invention.
The digital camera 10 includes a zoom lens barrel 12, an optical viewfinder 13, and a strobe 14 on the front of the camera body 11, a shutter button 15 on the upper surface of the camera body 11, and a zoom switch 16 and a shooting mode on the back of the camera body 11. A changeover switch 17 is provided.

  As shown in FIG. 2, the imaging optical system of the zoom lens barrel 12 includes a zoom lens 20 including a plurality of lens groups L1, L2, and L3, and an imaging sensor (shake correction optical element provided at the focal position of the zoom lens). ) 21. The optical axis of the zoom lens 20 is indicated by OZ. The digital camera 10 also includes a main CPU (optical axis correction control means, image shake correction control means) 22, a shake correction control CPU (optical axis correction control means, image shake correction control means) 23, an EEPROM (storage means) 24, an X A gyro sensor 25 and a Y gyro sensor 26 are incorporated.

  The lens group L2 constituting the zoom lens 20 is designed (ideally) via a zoom drive mechanism (optical element position conversion means) 31 having a zoom motor (optical element position conversion means) 30 as a drive source. It is moved along the optical axis OZ, and the focal length of the zoom lens 20 is changed by the movement of the lens unit L2. Here, only the lens unit L2 is moved for the sake of simplicity, but a plurality of lens units including the lens units L1 and L3 may be moved when changing the focal length. The zoom switch 16 is a momentary switch that can be operated to the tele (Tele) side and the wide (Wide) side, and the zoom lens 20 changes to the long focal point side by the operation to the tele (Tele) side, and to the wide (Wide) side. As a result, the zoom lens 20 changes to the short focal point side.

  Also, an X drive mechanism (optical element shift means) 34 using an X axis motor (optical element shift means) 32 as a drive source and a Y drive mechanism (optical element) using a Y axis motor (optical element shift means) 33 as a drive source. The image sensor 21 can be moved in a plane orthogonal to the optical axis OZ via the shift means 35. Specifically, the X drive mechanism 34 linearly moves the imaging sensor 21 in the X axis direction (see FIG. 2) which is the left-right direction in a plane orthogonal to the optical axis OZ, and the Y drive mechanism 35 is connected to the optical axis OZ. The image sensor 21 is linearly moved in the Y-axis direction (see FIG. 2) which is the vertical direction in the orthogonal plane. The X axis and the Y axis are orthogonal to each other.

  By using the X drive mechanism 34 (X-axis motor 32) and the Y drive mechanism 35 (Y-axis motor 33), the image sensor 21 is moved in accordance with the direction and magnitude of shake applied to the digital camera 10, thereby capturing an image. A shift (image blur) of the subject image on the imaging surface of the sensor 21 can be corrected. Specifically, the X gyro sensor 25 and the Y gyro sensor 26 detect moving angular velocities around the X axis and the Y axis, respectively. Then, the moving angle is obtained by time-integrating the angular velocities in the X and Y axial directions detected via the X gyro sensor 25 and the Y gyro sensor 26, and the focal plane (the imaging plane of the imaging sensor 21) is obtained from the moving angle. The amount of movement of the image in the X-axis direction and the Y-axis direction is calculated, and the drive amount and drive direction of the image sensor 21 with respect to each axis direction for canceling the image blur (X-axis motor 32 and Y-axis motor). 33 drive amount) is calculated. Based on this calculated value, the shake correction control CPU 23 drives and controls the X-axis motor 32 and the Y-axis motor 33. Thereby, the shake of the subject image imaged by the imaging sensor 21 is suppressed. The image blur correction mode can be entered by turning on the shooting mode switching switch 17, and in the state where the shooting mode switching switch 17 is turned off, the image blur correction function is stopped and normal shooting can be performed. Note that if the X drive mechanism 34 and the Y drive mechanism 35 are independently driven at the same time, the image sensor 21 can be moved linearly or curvedly in an arbitrary direction.

  The lens group L2 is designed to be moved along (in parallel with) the optical axis OZ of the zoom lens 20 when the focal length is changed. However, as shown in FIG. 2, the lens group L2 is actually moved slightly non-parallel to the optical axis OZ, that is, from the solid line position to the broken line position. As a result, the optical axis indicated by the broken line OZ ′ in FIG. Assume that a displacement occurs. Then, the position of the subject image on the imaging surface of the imaging sensor 21 is shifted from the solid line position to the broken line position. In addition to the above-described image blur correction operation, the digital camera 10 can prevent the displacement of the subject image by driving the imaging sensor 21 in a direction that cancels the influence of the optical axis shift accompanying the change in the focal length.

  The flowcharts of FIGS. 3 to 5 show the optical axis correction control accompanying the change of the focal length. As a premise of the control, the focal length of the zoom lens 20 of the present embodiment is set stepwise in seven steps from the wide end to the tele end. In FIG. 3, the seven stages of focal length information are represented as zoom data (ZoomData) 1 to 7, and the wide end is zoom data 1, the tele end is zoom data 7, and intermediate focal length steps are zoom data 2 to 2, respectively. 6.

  Here, when the optical axis of one of the lenses is shifted or tilted from the designed optical axis OZ due to a manufacturing error or an assembly error of the zoom lens 20, the movable lens is designed on the occasion of zooming. When the zoom lens 20 does not move in parallel on the optical axis OZ, the position where the actual optical axis extending in the image plane direction of the zoom lens 20 intersects the image sensor 21 moves, and the object formed on the image sensor 21 The image may move. Therefore, the amount of optical axis deviation at the focal length in 7 steps from the wide end to the tele end, specifically, for example, the amount of movement of the subject image from the reference position is measured in advance, and the subject image due to the optical axis deviation at each focal length is measured. Shift data (ShiftData) indicating the drive amount of the image sensor 21 for correcting the displacement is calculated and written in the EEPROM 24. The shift data for each focal length includes X-direction shift data indicating the drive amount of the X-axis motor 32 and Y-direction shift data indicating the drive amount of the Y-axis motor 33, and zoom data 1 (wide end). A total of 14 data are recorded from X shift data 1 and Y shift data 1 corresponding to 1 to X shift data 7 and Y shift data 7 corresponding to zoom data 7 (tele end). In this embodiment, the number of zoom stages is set to 7 for convenience, but the number of zoom stages is not limited to this.

It should be noted that each of the seven X-direction shift data and Y-direction shift data in this embodiment is such that the center of the imaging surface of the imaging sensor 21 and the actual optical axis OZ intersect the imaging surface when zooming is performed for each zoom step. It is the data which measured the distance of the X direction of the point (an axial ray enters) and a Y direction.
This embodiment includes position sensors 36 and 37 that detect the position of the image sensor 21 in the X direction and the Y direction. If the position sensors 36 and 37 are configured to be able to detect the absolute position of the image sensor 21 in the X direction and the Y direction over the entire movable range, the position of the image sensor 21 after optical axis deviation correction can be accurately set. .

  In addition, the EEPROM 24 stores the amount of positional deviation of the subject image from the reference position, reads out the amount of positional deviation corresponding to when the zoom lens 20 is zoomed, and drives the X-axis and Y-axis motors 32 and 33 to drive. May be calculated.

  The flowchart in FIG. 3 shows control by the main CPU 22. When the operation of the zoom switch 16 is input (step S10), it is determined whether or not the state of the zoom switch 16 changes (step S11). Here, if the state of the zoom switch 16 does not change (N in step S11), the optical axis is not displaced, and the process is exited without performing optical axis correction. When the state of the zoom switch 16 changes (Y in step S11), it is checked which of the seven focal lengths from the wide end to the tele end is selected according to the switch operation (steps S12 to S18). . Then, shift data in the X direction and Y direction corresponding to the selected focal length (zoom data) is read from the EEPROM 24 (steps S19 to S25), and zoom data n (n is a predetermined number from 1 to 7, below). Similarly, the X shift data n and the Y shift data n are transmitted to the shake correction control CPU 23 (steps S26 and S27). For example, when the zoom switch 16 is operated to change to the third step from the wide end, that is, the focal length step of the zoom data 3 (Y in step S14), the shift data read from the EEPROM 24 is the X shift data 3 and Y Shift data 3 is obtained (step S21).

  The shake correction control CPU 23 drives the zoom motor 30 based on the input zoom data n to change the focal length of the zoom lens 20. Further, the X-axis motor 32 and the Y-axis motor 33 are driven based on the inputted X shift data n and Y shift data n to correct the optical axis shift accompanying the change in focal length. Note that the digital camera 10 of this embodiment can be turned on and off by the shooting mode changeover switch 17, and there is a difference in control between when the image blur correction mode is on and when it is off.

  FIG. 4 shows optical axis correction control by the shake correction control CPU 23 when the image shake correction mode is off. The zoom data n, X shift data n, and Y shift data n transmitted from the main CPU 22 in steps S26 and S27 in FIG. 3 are input to the shake correction control CPU 23 (steps S30 and S31), and the zoom motor 30 is based on the zoom data. Is driven (step S32). Then, the lens group L2 moves in the optical axis direction and the focal length changes. When the set focal length is reached and the zoom motor 30 is stopped (Y in step S33), the movement amount in the X-axis direction for optical axis correction is calculated in the subsequent step S34. Here, the X movement amount is obtained from the difference between the designed image center position (XCenter) in the X-axis direction and the inputted X shift data n. Then, the X-axis motor 32 is driven based on the calculated movement amount, and the image sensor 21 moves in the X-axis direction (step S35). When the drive of the X-axis motor 32 is completed (Y in step S36), the amount of movement in the Y-axis direction for optical axis correction is calculated in step S37. As in the case of the X axis, the Y movement amount is obtained from the difference between the designed image center position (YCenter) in the Y axis direction and the input Y shift data n. Then, based on the calculated movement amount, the Y-axis motor 33 is driven to move the image sensor 21 in the Y-axis direction (step S38). When the drive of the Y-axis motor 33 is completed (Y in step S39), the light The axis correction control ends. With the control described above, it is possible to prevent the displacement of the subject image even if the focal length is changed.

  FIG. 5 shows optical axis correction control by the shake correction control CPU 23 when the image shake correction mode is on. First, the zoom data n, the X shift data n, and the Y shift data n transmitted from the main CPU 22 are input to the shake correction control CPU 23 in the same manner as when the image shake correction mode in FIG. 4 is off (steps S40 and S41). In the off state of the image blur correction mode in FIG. 4, the image sensor 21 is moved for the sole purpose of correcting the optical axis shift due to the change in focal length, and after the image sensor 21 has moved to the subject image position correction position. Then, the image sensor 21 may be stopped until the focal length is changed next time. On the other hand, in the image blur correction mode of FIG. 5, the image sensor 21 is constantly moved for the purpose of image blur correction. Therefore, when obtaining the movement amount (median value) of the image sensor 21 for image blur correction, the above-described X, By calculating in consideration of the Y shift data n (steps S42 and S43), the optical axis deviation due to the change in focal length can be corrected simultaneously with the image blur correction. In other words, when the image sensor 21 performs the image blur correction operation in the X-axis direction and the Y-axis direction, a movement amount in which a correction amount for the positional deviation of the subject image due to the change in the focal length is incorporated.

  The above embodiment is an optical axis correction device that corrects an optical axis deviation caused by a change in focal length by the zoom lens 20, but the cause of the positional deviation between optical elements in the direction orthogonal to the optical axis is caused. Not limited to zoom operation. Basically, if the imaging apparatus attempts to give some change (magnification change) to the subject image by changing the relative positions of the plurality of optical elements, such a positional deviation may occur.

  6 to 9 show an embodiment in which the present invention is applied to a digital camera having an optical element that can be inserted and removed from the optical axis OZ. In FIG. 6 to FIG. 9, portions common to the embodiment of FIG. 1 to FIG. 5 are denoted by the same reference numerals, and description of overlapping contents is omitted.

  The digital camera 100 shown in FIG. 6 includes an insertion / extraction switch 116. When the insertion / extraction switch 116 is operated to the insertion (IN) side, an insertion / extraction drive mechanism (optical element) using an insertion / extraction motor (optical element position conversion means) 130 as a drive source. The insertion / extraction lens unit L2 'is inserted on the optical axis OZ via the position conversion means 131. When the insertion / extraction switch 116 is operated to the separation (OUT) side, the insertion / extraction lens group L2 ′ is also detached from the optical axis OZ to the outside of the optical axis via the insertion / extraction drive mechanism 131. For convenience, the optical element to be inserted / extracted here is an insertion / extraction lens group L2 ′ between the first lens group L1 and the second lens group L3, but the position of the optical element to be inserted / extracted is arbitrary. The function of the insertion / extraction lens group L2 ′ is also arbitrary, and any function can be used as long as it changes the state (magnification) of the subject image by insertion / extraction, such as a wide converter or a macro lens.

  As shown in FIG. 6, it is assumed that as a result of the insertion / extraction lens group L2 'being inserted at the position of the broken line, a positional deviation of the optical axis indicated by the broken line OZ' in FIG. Then, since the position of the subject image on the imaging surface of the imaging sensor 21 is shifted from the solid line position to the broken line position, the digital camera 100 drives the imaging sensor 21 in a direction to cancel the influence of the optical axis shift. Prevents misalignment of the subject image.

  The flowchart in FIG. 7 shows control by the main CPU 22. As a premise of this control, an optical axis deviation amount or a subject image positional deviation amount when the insertion / extraction lens unit L2 ′ is inserted on the optical axis is measured in advance, and subject image positional deviation is obtained as data influenced by the optical axis deviation. Shift data (ShiftData) indicating the drive amount of the image sensor 21 for correcting the amount is written in the EEPROM 24. The shift data includes X-direction shift data indicating the drive amount of the X-axis motor 32 and Y-direction shift data indicating the drive amount of the Y-axis motor 33.

  When an operation of the insertion / extraction switch 116 is input in step S50 of FIG. 7, it is determined whether or not the state of the insertion / extraction switch 116 changes (step S51). If there is no change in the state of the insertion / extraction switch 116 (N in step 51), the optical axis is not displaced, and the process is exited without performing optical axis correction. When the state of the insertion / extraction switch 116 changes (Y in step S51), shift data in the X direction and the Y direction corresponding to the insertion / extraction state are read from the EEPROM 24 (step S52). Then, the lens insertion / extraction signal, X shift data, and Y shift data are transmitted to the shake correction control CPU 23 (steps S53 and S54).

  Subsequently, the shake correction control CPU 23 drives the X-axis motor 32 and the Y-axis motor 33 based on the input X shift data and Y shift data, and the optical axis resulting from the insertion / extraction operation of the insertion / extraction lens group L2 ′. Correct the deviation. This control is shown below.

  FIG. 8 shows optical axis correction control by the shake correction control CPU 23 when the image shake correction mode is off. The lens insertion / extraction signal, X shift data, and Y shift data transmitted from the main CPU 22 are input to the shake correction control CPU 23 (steps S60 and S61), and the insertion / extraction motor 130 is driven based on the lens insertion / extraction signal (step S62). When the insertion / removal lens group L2 'moves to the designated position and the drive of the insertion / removal motor 130 is completed (Y in step S63), in the subsequent step S64, X for correcting the position of the subject image is input using the input X shift data. The movement amount in the axial direction is calculated, the X-axis motor 32 is driven based on the calculated movement amount, and the image sensor 21 is moved in the X-axis direction (step S65). When the driving of the X-axis motor 32 is finished (Y in step S66), in step S67, the amount of movement in the Y-axis direction for correcting the position of the subject image is calculated using the input Y shift data. Based on the amount of movement, the Y-axis motor 33 is driven to move the image sensor 21 in the Y-axis direction (step S68). When the drive of the Y-axis motor 33 is completed (Y in step S69), the optical axis correction control is completed. To do. With the above control, it is possible to prevent the displacement of the subject image even when the insertion / extraction lens group L2 ′ is inserted.

  FIG. 9 shows optical axis correction control by the shake correction control CPU 23 when the image shake correction mode is on. First, the lens insertion / extraction signal, X shift data, and Y shift data transmitted from the main CPU 22 are input to the shake correction control CPU 23 as in the case of turning off the image shake correction mode in FIG. 8 (steps S70 and S71). In the off state of the image blur correction mode in FIG. 8, the image sensor 21 is moved for the sole purpose of correcting the optical axis deviation due to lens insertion / extraction, and after the image sensor 21 has moved to the subject image position correction position, Next, the image sensor 21 may be stopped until the focal length is changed. On the other hand, in the image blur correction mode of FIG. 9, the image sensor 21 is constantly moved for the purpose of image blur correction. Therefore, when obtaining the movement amount (median value) of the image sensor 21 for image blur correction, the above-described X, By calculating in consideration of the Y shift data (steps S72 and S73), the optical axis deviation due to lens insertion / extraction can be corrected simultaneously with the image blur correction. In other words, when the image sensor 21 performs the image blur correction operation in the X-axis direction and the Y-axis direction, a movement amount in which a correction amount for the positional deviation of the subject image due to the lens insertion / extraction is incorporated.

  As described above, according to the optical axis correction apparatus and the optical axis correction method for an imaging apparatus to which the present invention is applied, it is possible to easily correct the displacement of the subject image during zooming or insertion / extraction of an optical element. In particular, since the positional deviation of the subject image is corrected using the image blur correcting means, it is not necessary to provide an original drive mechanism for correcting the optical axis deviation, and the structure is simple and the cost performance is high.

It is a front view of a digital camera provided with an optical axis correction device to which the present invention is applied. It is the figure which showed typically the main components of the digital camera. It is a flowchart figure which shows the flow of control in main CPU among the optical axis correction controls of the digital camera. It is a flowchart figure which shows the flow of control in the shake correction control CPU in the state where the image shake correction mode is off in the optical axis correction control of the digital camera. It is a flowchart figure which shows the flow of control in the shake correction control CPU in the state to which image shake correction mode is ON among the optical axis correction controls of the digital camera. It is the figure which showed typically the main component of the digital camera in the 2nd Embodiment of this invention. It is a flowchart figure which shows the flow of control in main CPU among the optical axis correction controls of 2nd Embodiment. It is a flowchart figure which shows the flow of control in the shake correction control CPU in the state where the image shake correction mode is off in the optical axis correction control of the second embodiment. It is a flowchart figure which shows the flow of control in shake correction control CPU in the state in which image shake correction mode is ON among the optical axis correction controls of 2nd Embodiment.

Explanation of symbols

10 100 Digital camera (imaging equipment)
16 Zoom switch 17 Shooting mode switch 20 Zoom lens 21 Image sensor (shake correction optical element)
22 Main CPU (optical axis correction control means, image blur correction control means)
23 shake correction control CPU (optical axis correction control means, image shake correction control means)
24 EEPROM (memory means)
25 X gyro sensor 26 Y gyro sensor 30 Zoom motor (optical element position conversion means)
31 Zoom drive mechanism (optical element position conversion means)
32 X-axis motor (optical element shifting means)
33 Y-axis motor (optical element shifting means)
34 X drive mechanism (optical element shifting means)
35 Y drive mechanism (optical element shifting means)
116 Insertion / extraction switch 130 Insertion / extraction motor (optical element position conversion means)
131 Insertion / extraction drive mechanism (optical element position conversion means)
L1 L2 L3 Lens unit L2 'Insertion / extraction lens unit OZ Optical axis

Claims (10)

An imaging optical system including an optical element position conversion means for changing the state of the subject image by changing the mutual positions of a plurality of optical elements;
Optical element shifting means for operating at least one of the plurality of optical elements in a plane perpendicular to the optical axis;
Data related to the positional deviation of the subject image due to the positional deviation in the direction orthogonal to the optical axis between the optical elements, which is generated when the mutual position of the plurality of optical elements is changed by the optical element position converting means. Storage means stored in advance;
Depending on the operating state of the optical element position converting means, at least one of the plurality of optical elements is light-emitted by the optical element shifting means based on the data related to the positional deviation of the subject image stored in the storage means. An optical axis correction apparatus for an imaging apparatus, comprising: an optical axis correction control unit that drives in a plane orthogonal to the axis to correct a positional deviation of a subject image. 2. The optical axis correction device for an imaging apparatus according to claim 1, wherein the optical element position conversion means is a zoom drive mechanism that changes a focal length by changing an optical axis direction interval of a plurality of optical elements positioned on the optical axis. An optical axis correction device for an imaging device. 2. The optical axis correction apparatus for an imaging apparatus according to claim 1, wherein the optical element position converting means is an insertion / extraction drive mechanism for moving the insertion optical element to an insertion position on the optical axis and a position away from the optical axis. Optical axis correction device. 4. The optical axis correction apparatus for an imaging apparatus according to claim 1, wherein the optical axis correction control means executes an optical axis correction operation after the operation of the optical element position conversion means is completed. Optical axis correction device. 5. The optical axis correction device for an imaging apparatus according to claim 1, further comprising an imaging sensor that captures the subject image, and an optical element that is operated in a plane orthogonal to the optical axis by the optical element shift unit. Is an optical axis correction device for an imaging device that is the imaging sensor. 6. The optical axis correction device for an imaging apparatus according to claim 1, wherein the optical element is shifted by the optical element shift means in a plane orthogonal to the optical axis according to the magnitude and direction of shake applied to the imaging optical system. An optical axis correction apparatus for an imaging apparatus, comprising image blur correction control means that operates within the image sensor and cancels image blur on the imaging surface. 7. The optical axis correction apparatus for an imaging apparatus according to claim 6, wherein the image blur correction function by the image blur correction control means can be turned on / off, and when the image blur correction function is on, the image blur correction control means has the storage means. An optical axis correction apparatus for an imaging apparatus that determines the optical element driving amount for image blur correction by the optical element shift means in consideration of the data stored in the above. An imaging optical system including an optical element position conversion means for changing the state of the subject image by changing the mutual positions of a plurality of optical elements;
Image blur that cancels image blur on the imaging plane by operating the blur correction optical element included in the plurality of optical elements in a plane orthogonal to the optical axis according to the magnitude and direction of shake applied to the imaging optical system. Correction means;
Data relating to the positional deviation of the subject image due to the positional deviation in the direction orthogonal to the optical axis between the optical elements generated when the mutual position of the plurality of optical elements is changed by the optical element position converting means. Storage means stored in advance;
Optical axis correction control means for reading the data stored in the storage means in accordance with the operation state of the optical element position conversion means and driving the shake correction optical element to a position where the image shake correction means corrects the positional deviation of the subject image. And an optical axis correction apparatus for an imaging device. An imaging optical system including an optical element position converting unit that changes the state of a subject image by changing the positions of a plurality of optical elements, and at least one of the plurality of optical elements operates in a plane orthogonal to the optical axis In an imaging device comprising an optical element shift means for causing
A step of measuring a positional deviation amount of the subject image due to a positional deviation in a direction orthogonal to the optical axis between the optical elements, which occurs when the mutual position of the plurality of optical elements is changed by the optical element position converting means. When;
Calculating a driving amount of the at least one optical element that corrects the positional deviation of the subject image based on the measured positional deviation amount;
Storing the calculated drive amount in a storage means in advance;
The driving amount stored in the storage means is read in accordance with the operation state of the optical element position converting means, and the at least one optical element is operated in a plane orthogonal to the optical axis by the optical element shifting means to A method of correcting an optical axis of an imaging apparatus, comprising: a step of correcting misalignment. An imaging optical system including an optical element position converting unit that changes the state of a subject image by changing the positions of a plurality of optical elements, and at least one of the plurality of optical elements operates in a plane orthogonal to the optical axis In an imaging device comprising an optical element shift means for causing
Data relating to the positional deviation of the subject image due to the positional deviation in the direction orthogonal to the optical axis between the optical elements generated when the mutual position of the plurality of optical elements is changed by the optical element position converting means. Measuring and pre-storing the data in storage means;
Reading the data stored in the storage means in accordance with the operating state of the optical element position conversion means, and calculating a correction amount for correcting the positional deviation of the subject image by the optical element shift means;
And a step of operating the at least one optical element in a plane orthogonal to the optical axis by the optical element shift means based on the correction amount to correct the positional deviation of the subject image. Optical axis correction method.

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