JP6685702B2 - Imaging device and lens drive control method - Google Patents

Description

  The present invention relates to, for example, an image pickup apparatus such as a digital camera, and more particularly to a lens drive control technique for an image pickup apparatus including a lens barrel having two lens groups that move in a direction orthogonal to an optical axis.

  In imaging devices such as digital cameras, the retractable length of the lens barrel has been increasing with the recent increase in magnification. Therefore, there is proposed a technique for shortening the retractable length of the lens barrel by providing a retracting mechanism that retracts a part of the lens units of each lens unit forming the photographing optical system of the lens barrel from the optical axis during the retracting operation. (Patent Document 1).

Japanese Patent No. 5487823

  However, in Patent Document 1 described above, an image blur correction lens group that moves in a direction orthogonal to the optical axis is mounted in addition to the retract lens group, and the image blur correction lens group is in the retracted position before the retract of the retract lens group. Stored in position. Therefore, when an unexpected external force such as a large shake of the camera is applied during the collapsing operation of the lens barrel while the retractable lens group and the image blur correction lens group are close to each other, the retractable lens group and the image blurring The correction lens group may interfere.

  Therefore, the present invention prevents the lens groups from interfering with each other due to an unexpected external force applied to the imaging device during the collapsing operation of the lens barrel including the two lens groups that move in the direction orthogonal to the optical axis. The purpose is to provide the technology.

In order to achieve the above object, an image pickup apparatus of the present invention includes a first lens group that moves in a direction orthogonal to an optical axis during retracting operation and retracts from the optical axis, and the first lens group moves during retracting operation. A second lens group that is provided so as to be movable in a direction parallel to the direction in which the first lens group is retracted so as to partially overlap the position before the first lens group retracts from the optical axis; position detecting means for detecting a position of the second lens group with respect to the lens group, the first lens group is located at the position of the second lens group with respect to the first lens group by said position detecting means in a state in which the retracted position Based on the detection result, a determining unit that determines whether the second lens unit is approaching the first lens unit in the direction of the optical axis to a predetermined set position; 2 lens groups Control means for controlling a drive unit for driving the second lens group to move the second lens group in a direction away from the first lens group when it is determined that the second lens group is approaching to a fixed position. The control means controls the drive amount of the second lens group in the direction away from the first lens group to determine the position of the first lens group and the second lens group in the direction of the optical axis by the position detection means. It is characterized in that the drive unit is controlled so as to be changed according to the detection result.

The lens drive control method of the present invention comprises a first lens group that moves in a direction orthogonal to the optical axis during retracting operation and retracts from the optical axis, and a direction parallel to the direction in which the first lens group moves during retracting operation. A method of controlling the drive of a second lens group that is movably provided in the first lens group and is housed so as to overlap with a part of the position before the first lens group retracts from the optical axis in the retracted position, a position detecting step of detecting a position of the second lens group with respect to the first lens group, the second lens group with respect to the first lens group in said position detecting step in a state where the first lens group is in the retracted position And a determination step for determining whether or not the second lens group is approaching the first lens group in the direction of the optical axis to a predetermined set position based on the detection result of the position. When it is determined that the second lens group is approaching to the set position, the driving unit that drives the second lens group is controlled to move the second lens group away from the first lens group. And a control step of moving the second lens group in a direction away from the first lens group to the first lens group and the second lens group in the position detecting step. The drive unit is controlled so as to be changed according to the detection result of the position in the direction of the optical axis.

  According to the present invention, it is possible to prevent the lens groups from interfering with each other due to an unexpected external force applied to the imaging device during the collapsing operation of the lens barrel including the two lens groups that move in the direction orthogonal to the optical axis. can do.

FIG. 1 is a block diagram showing a system configuration of a digital camera which is an example of a first embodiment of an image pickup apparatus of the present invention. FIG. 9 is a diagram illustrating the operations of the focus lens group and the image blur correction lens group during the collapsing operation of the lens barrel portion. FIG. 6 is a diagram showing a positional relationship between the focus lens group and the image blur correction lens group during the retracting operation of the focus lens group. FIG. 9 is a graph showing a relationship between the amount of power supplied to the lens barrel drive section for each position of the image blur correction lens group during the retracting operation of the focus lens group. It is a flowchart figure explaining the lens drive control method of the focus lens group and image blurring correction lens group at the time of the collapsing operation of the lens-barrel part. FIG. 16 is a diagram showing a positional relationship between the focus lens group and the image blur correction lens group during the retracting operation of the focus lens group in the digital camera which is an example of the second embodiment of the image pickup apparatus of the present invention. It is a flowchart figure explaining the lens drive control method of the focus lens group and image blurring correction lens group at the time of the collapsing operation of the lens-barrel part.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a block diagram showing a system configuration of a digital camera which is an example of a first embodiment of an image pickup apparatus of the present invention.

  As shown in FIG. 1, a digital camera 200 (hereinafter referred to as a camera 200) of the present embodiment has a system control unit 201, a lens barrel drive control unit 202, a lens barrel drive unit 203, a lens barrel unit 204, and an imaging unit 205. The imaging control unit 206 is provided. The camera 200 also includes a display unit 207, a display control unit 208, a recording unit 209, an external recording unit 210, a flash device 211, an operating unit 212, a power supply unit 213, and a power supply control unit 214.

  The system control unit 201 includes an exposure control unit 201a, a distance measurement control unit 201b, an image processing unit 201c, and a speed control unit 201d. The lens barrel unit 204 includes a zoom lens group 204a, a focus lens group 204b, a diaphragm 204c, a shutter 204d, an image blur correction lens group 204e, and a fixed lens group 204f. The focus lens group 204b corresponds to an example of the first lens group of the present invention, and the image blur correction lens group 204e corresponds to an example of the second lens group of the present invention.

  The details will be described below.

  The system control unit 201 uses a CPU or the like to control the entire system based on a control program. Further, the system control unit 201 uses the exposure control unit 201a, the distance measurement control unit 201b, the image processing unit 201c, and the speed control unit 201d to perform appropriate lens barrel control and image processing depending on the situation.

  Specifically, the exposure control unit 201a and the distance measurement control unit 201b perform a predetermined calculation process using the image data obtained from the image pickup unit 205 and the image pickup control unit 206, and based on the obtained calculation result, the lens barrel. A drive signal is transmitted to the lens barrel drive section 203 through the drive control section 202. The lens barrel unit 204 performs operations related to AF (autofocus) processing and AE (automatic exposure) processing based on the drive signal transmitted from the lens barrel driving unit 203.

  The image processing unit 201c performs image data processing such as resizing processing such as pixel interpolation and image reduction, and color conversion processing on the data from the imaging control unit 206 or the recording unit 209 or the external recording unit 210. The speed control unit 201d calculates the positions and speeds of the zoom lens group 204a and the focus lens group 204b based on signals detected by an encoder that uses an optical sensor (not shown) or the like. Then, the obtained speed information is sent to the speed control unit 201d so that the drive speeds of the zoom lens group 204a and the focus lens group 204b become a predetermined target speed, and the lens barrel drive control unit 202 is calculated from the difference with the target speed. Send a control signal to.

  The lens barrel drive control unit 202 is mainly composed of a driver IC and the like, and is based on a control signal from the system control unit 201 and information obtained from an optical sensor (not shown), a magnetic sensor, a sensor for detecting inclination, and the like. A desired drive signal is transmitted to the drive unit 203. Further, the lens barrel drive control unit 202 sends a detection signal from each sensor to the speed control unit 201d.

  The lens barrel drive unit 203 is composed of a DC motor, a stepping motor, or the like. The lens barrel driving unit 203, based on a control signal from the lens barrel driving control unit 202, a zoom lens group 204a, a focus lens group 204b, an aperture 204c, a shutter 204d, an image blur correction lens group 204e, and a fixed lens of the lens barrel unit 204. The group 204f is driven.

  The image pickup unit 205 is composed of an image pickup element such as a CCD sensor or a CMOS sensor. The image sensor photoelectrically converts the subject light flux that has passed through the lens group forming the photographing optical system of the lens barrel section 204 and formed an image, and outputs the converted electric signal. The electric signal converted by the image pickup device is converted into a video signal by a signal processing system circuit of the image pickup control unit 206, subjected to predetermined processing, and output as a signal capable of displaying a video.

  The display unit 207 includes an LCD or the like, and displays the image data for display sent from the display control unit 208 via a D / A conversion unit (not shown). Further, the display unit 207 can realize an EVF (Electronic View Finder) function by sequentially displaying the image data from the imaging unit 205 and the imaging control unit 206 through the display control unit 208.

  The recording unit 209 is used as a temporary recording medium for recording various data such as captured video information, time information, setting information, and image processing. The recording unit 209 also includes a memory device for storing various programs executed by the system control unit 201. The external recording unit 210 includes recording media such as various memory cards. The external recording unit 210 stores image data that has been subjected to predetermined processing. The strobe device 211 also has an AF auxiliary light projection function and a strobe light control function, and is controlled by the exposure control unit 201a and the distance measurement control unit 201b.

  The operation unit 212 includes a group of various operation buttons, an operation lever, an operation dial, a touch panel provided on the display unit 207, and the like. For example, the shutter release switch SW1 is turned on to instruct the start of AF processing, AE processing and the like by a half-press operation, and the shutter switch SW2 is turned on to instruct a start of a photographing operation by a full press operation. Further, the zoom lever performs a variable power operation within a specified range while being pressed, and ends the operation when released.

  The power supply control unit 214 is configured by a power supply detection circuit, a DC-DC converter, an eddy current detection circuit, a battery remaining amount detection circuit, and the like, and makes the power obtained from the power supply unit 213 a desired voltage for each system and needs it. Supply power accordingly. The power supply unit 213 includes a primary battery such as an alkaline battery or a lithium battery, a secondary battery such as a Li battery, an AC adapter, or the like.

  Next, with reference to FIG. 2, the operation of the focus lens group 204b and the image blur correction lens 321 during the retracting operation of the lens barrel section 204 will be described. In the present embodiment, the focus lens group 204b is taken as an example of the retractable lens group. In FIG. 2, the focus lens group 204b is gradually retracted in the direction orthogonal to the optical axis in accordance with the collapsing operation of the fixed lens group 204f. After that, the image blur correction lens group 204e is stored at the position before the retraction of the focus lens group 204b. In FIG. 2, only members related to the retracting operation of the focus lens group 204b are shown.

  As shown in FIG. 2A, the focus lens group 204b has a focus lens 311, a focus base 312, a retracting rotary cylinder 313, a stopper guide 314, and a retracting guide 315. The focus lens group 204b moves in the optical axis direction along the guide bar 341 extending in parallel with the optical axis from the lens barrel base 340 by the focusing operation. A stepping motor is used as the lens barrel driving unit 203. The retracting rotary cylinder 313 is integrated with the focus lens 311 by molding.

  The focus lens group 204b has a shooting position where the focus lens 311 enters the shooting optical path and is arranged on the optical axis, and a retracting position where the focus lens 311 moves in a direction orthogonal to the optical axis and retracts from the optical axis. It is rotatably supported between. Further, the focus lens group 204b is biased toward a shooting position by a biasing spring (not shown), and at the shooting position, the retracting rotary cylinder 313 abuts on the stopper guide 314 and further rotation is restricted. There is.

  The image blur correction lens group 204e includes an image blur correction lens 321 and an image blur correction base 322. The image blur correction lens group 204e is provided with an actuator (lens barrel drive unit 203) for driving the image blur correction lens group 204e in a direction orthogonal to the optical axis, a magnetic sensor for position detection, and the like. There is.

  The fixed lens group 204f includes a fixed lens 331, a base 332, and a retracting guide cylinder 333. Further, the base 332 and the image blur correction base 322 of the image blur correction lens group 204e are respectively connected to a straight-moving barrel and a cam barrel (not shown) that form the zoom lens 204a, and are linked to the zoom operation in the optical axis direction. Moving.

  Next, the retracting operation of the focus lens group 204b will be described. First, with the collapsing operation of the fixed lens group 204f, the protruding portion 333a of the retracting guide cylinder 333 comes into contact with the protruding portion 313a of the retracting rotation cylinder 313 of the focus lens group 204b and pushes down to rotate the retracting rotation cylinder 313.

  The focus lens 311 gradually moves in the direction orthogonal to the optical axis from the stopper guide 314 toward the evacuation guide 315 against the urging force of the urging spring (not shown) with the rotation operation of the evacuation rotary cylinder 313 ( See FIG. 2B). Then, in the focus lens group 204b, the retracting barrel 313 is pressed against the retracting guide 315, so that the retracted position at the time of collapsing is fixed and the retracting operation is completed (see FIG. 2C).

  Further, when the focus lens group 204b returns from the retracted position to the shooting position, the retracting rotary cylinder by the protruding portion 333a of the retracting guide cylinder 333 is moved as the rectilinear barrel and the cam barrel move out from the retracted position and move in the optical axis direction. The force that pushes down the protruding portion 313a of 313 is weakened. As a result, the retracting rotary cylinder 313 rotates toward the shooting position by the biasing force of the biasing spring, contacts the stopper guide 314, and the focus lens 311 returns to the shooting position shown in FIG. 2A.

  Next, the operation of the image blur correction lens group 204e during the retracting operation will be described. In the following description, the image blur correction lens group 204e will be described as the image blur correction lens 321.

  As shown in FIG. 2, the image blur correction lens 321 is housed in the position of the focus lens group 204b after the focus lens group 204b is retracted and before it is retracted. At this time, the image blur correction lens 321 is moved in the direction orthogonal to the optical axis in the direction opposite to the retracted position of the focus lens group 204b so as not to interfere with the focus lens group 204b, and the position before the retracted position of the focus lens group 204b. (Fig. 2 (c)).

  Here, it is considered that the image blur correction lens 321 moves toward the retracted position of the focus lens group 204b due to an unexpected external force during the operation of housing the image blur correction lens 321 at the position before the retract of the focus lens group 204b. To be For example, it can be easily assumed that the camera 200 is moved while the camera 200 is retracted after the power of the camera 200 is turned off. In that case, when the camera 200 is shaken strongly, the image blur correction lens 321 interferes with the focus lens group 204b, and the lens may be damaged depending on the interference.

  Therefore, in the present embodiment, the positional relationship between the focus lens group 204b and the image blur correction lens 321 is detected. Specifically, the positions of the focus lens group 204b and the image blur correction lens 321 are detected by the two axes of the optical axis direction and the direction orthogonal to the optical axis, and if necessary, an acceleration sensor as an example of an acceleration detection unit. Is used to detect the external force applied to the camera 200.

  Then, when the focus lens group 204b and the image blur correction lens 321 come close to each other in the optical axis direction during the collapse, the image blur correction lens 321 is moved in the direction opposite to the retracted position of the focus lens group 204b. Further, when the image blur correction lens 321 moves to the retracted position of the focus lens group 204b, it is not necessary to always drive the image blur correction lens 321 with the maximum driving force, and therefore the image blur correction lens 321 does not move. Set an appropriate driving force according to the positional relationship of.

  The timing of moving the image blur correction lens 321 in the direction orthogonal to the optical axis is determined by the positional relationship of each lens group managed by the pulse signal of the zoom encoder by the optical sensor. Further, the position detection result by the magnetic sensor in the direction orthogonal to the optical axis of the image blur correction lens 321 can be taken into consideration. Based on the detection results of these sensors, the relative positional relationship between the focus lens group 204b and the image blur correction lens 321 in the optical axis direction, and the positional relationship between the focus lens group 204b and the image blur correction lens 321 in the direction orthogonal to the optical axis. I understand.

  FIG. 3 is a diagram showing a positional relationship between the focus lens group 204b and the image blur correction lens 321 during the retracting operation of the focus lens group 204b. FIG. 4 is a graph showing the relationship of the energization amount to the lens barrel driving unit 203 for each position of the image blur correction lens 321 during the retracting operation of the focus lens group 204b. The positions of the image blur correction lens 321 of A to E on the horizontal axis of FIG. 4 correspond to the positions of the image blur correction lens 321 of FIGS. 3 (a) to 3 (e).

  FIG. 3A is a diagram showing the positional relationship between the focus lens group 204b and the image blur correction lens 321 at the wide position before the collapsing operation. FIG. 3B is a diagram showing a positional relationship in which the focus lens group 204b and the image shake correction lens 321 which are in the retracted position during the collapsing operation are close to each other in the optical axis direction.

  FIG. 3C is a diagram showing a state in which the image blur correction lens 321 has started to move in the direction orthogonal to the optical axis with respect to the focus lens group 204b in the retracted position. FIG. 3D is a diagram showing a state in which the amount of electricity (driving current value) to the lens barrel driving unit 203 that drives the image blur correction lens 321 is maximum. FIG. 3E is a diagram showing a retracted state in which the storage of the image blur correction lens 321 is completed.

  As shown in FIG. 3A, the focus lens group 204b and the image blur correction lens group 204e are arranged side by side on the optical axis from a wide position to a tele position where the position of the lens barrel portion 204 can be photographed. There is.

  When the lens barrel portion 204 is retracted from the state shown in FIG. 3A, the focus lens group 204b moves to the retracted position in the direction orthogonal to the optical axis, as shown in FIG. 3B. Then, after the movement of the focus lens group 204b to the retracted position is completed, the image blur correction lens 321 approaches the focus lens group 204b in the optical axis direction with the collapsing operation.

  The center of the image blur correction lens 321 in FIGS. 3A and 3B is arranged on the optical axis, and the amount of electricity supplied to the lens barrel drive unit 203 at this time is at positions A and B in FIG. As shown, it is the smallest energization amount during the collapsing operation.

  When the lens barrel portion 204 is further retracted from the state shown in FIG. 3B, the image blur correction lens 321 approaching the focus lens group 204b in the optical axis direction is focused as shown in FIG. 3C. The movement of the lens group 204b in the direction opposite to the retracted position is started.

  At this time, as shown in positions B to C in FIG. 4, the image blur correction lens 321 is driven by a driving amount (to the lens barrel drive unit 203) as the position in the optical axis direction approaches the focus lens group 204b. The energization amount) gradually rises.

  The drive amount (movement amount) of the image blur correction lens 321 here is determined in advance by the relative position of the focus lens group 204b and the image blur correction lens 321 which is managed by the pulse signal of the zoom encoder. Since the position detection of the image blur correction lens 321 is publicly known, detailed description thereof will be omitted.

  When the lens barrel portion 204 is further retracted from the state shown in FIG. 3C, as shown in positions C to D of FIG. 4, the driving amount of the image blur correction lens 321 (to the lens barrel driving portion 203). The energization amount) gradually rises to the state shown in FIG. The drive amount of the image blur correction lens 321 at this time becomes maximum at the position D in FIG. 4, and the image blur correction lens 321 is at a position separated from the retracted position of the focus lens group 204b in the direction orthogonal to the optical axis. Is located in.

  As a result, even when an unexpected external force such as a large shake of the camera 200 is applied while the focus lens group 204b and the image blur correction lens 321 are close to each other during the collapsing operation, the image blur correction lens 321 is moved to the focus lens group 204b. It can prevent interference.

  When the lens barrel 204 is further retracted from the state shown in FIG. 3D, the image blur correction lens 321 is stored at the position before the retraction of the focus lens group 204b as shown in FIG. 3E. It At this time, the energization amount of the image blur correction lens 321 with respect to the lens barrel drive unit 203 is maintained at a holding current enough to keep the image blur correction lens 321 in the storage position until the power of the camera 200 is turned off.

  It should be noted that the image blur correction lens 321 can stably stay in the storage position by contacting the focus lens group 204b in the stopped state even when the energization amount to the lens barrel drive unit 203 is zero.

  Next, with reference to FIG. 5, a lens drive control method of the focus lens group 204b and the image blur correction lens 321 during the retracting operation of the lens barrel portion 204 will be described. Each process shown in FIG. 5 is executed by the CPU or the like of the system control unit 201, for example, by expanding a program stored in the recording unit 209 in a RAM (not shown).

  In FIG. 5, in step S501, the system control unit 201 drives the lens barrel drive unit 203 via the lens barrel drive control unit 202 according to a user operation or a system determination, and starts the collapsing operation of the lens barrel unit 204.

  In step S502, the system control unit 201 causes the lens barrel drive control unit 202 to start detection by the zoom encoder for detecting the operation of the zoom lens 204a at the same time when the retracting operation of the lens barrel unit 204 is started. Then, the system control unit 201 starts counting the zoom pulse by the zoom encoder, detects the position of each lens group in the optical axis direction, and proceeds to step S503.

  In step S503, the system control unit 201 determines whether the zoom position of the lens groups has reached the starting point of the retracting operation of the image blur correction lens 321, based on the detection result of the position of each lens group in step S502. Then, the system control unit 201 proceeds to step S504 if the zoom position of the lens group has reached the start point of the retracting operation of the image blur correction lens 321, otherwise returns to step S502 and reaches it. Continue zooming until. At this point, the retracting operation of the focus lens group 204b is completed.

  In step S504, the system control unit 201 drives the lens barrel drive unit 203 via the lens barrel drive control unit 202 to start the retracting operation of the image blur correction lens 321, and proceeds to step S505.

  In step S505, the system control unit 201 determines whether the position of the image blur correction lens group 204e with respect to the focus lens group 204b in the optical axis direction with respect to the focus lens group 204b approaches the preset position T based on the count value of the zoom pulse by the zoom encoder. to decide.

  In determining the setting position T here, the position in the direction orthogonal to the optical axis of the image blur correction lens 321 can be finely set depending on the positional relationship between the focus lens group 204b and the image blur correction lens 321 in the optical axis direction. It is possible. Also from the viewpoint of suppressing the drive power of the image blur correction lens 321 due to an increase in the amount of energization, which will be described later, it is possible to suppress unnecessary power consumption by making the setting position in the direction orthogonal to the optical axis of the image blur correction lens 321 fine. it can.

  Then, when the image blur correction lens 321 approaches the focus lens group 204b to the set position T (see FIG. 3C), the system control unit 201 proceeds to step S506 and does not approach the set position T. In this case, the zoom operation is continued.

  In step S506, the system control unit 201 increases the drive amount of the image blur correction lens 321 by increasing and changing the energization amount to the lens barrel drive unit 203 that drives the image blur correction lens 321 by the lens barrel drive control unit 202. It proceeds to step S507. The method of increasing and changing the energization amount is as described above with reference to FIGS. 3 and 4, and the system control unit 201 causes the lens barrel drive control unit 202 to adjust the image blur correction lens so that the target energization amount is changed. The energization amount to the lens barrel drive unit 203 that drives 321 is gradually increased. Also in the subsequent processing, in order to avoid a steep current change when changing the energization amount, the energization amount is gradually changed toward the target energization amount according to the zoom position, and the driving amount of the image blur correction lens 321 is changed. Go.

  In step S507, the system control unit 201 determines whether the image blur correction lens 321 has moved to the position closest to the focus lens group 204b in the optical axis direction (see FIG. 3D). When the system control unit 201 determines that the image blur correction lens 321 has moved to the position closest to the focus lens group 204b in the optical axis direction, the process proceeds to step S508.

  In step S508, the system control unit 201 maximizes the drive amount of the image blur correction lens 321 by maximizing the energization amount to the lens barrel drive unit 203 that drives the image blur correction lens 321 via the lens barrel drive control unit 202. And proceed to step S509. As a result, the image blur correction lens 321 is moved in the direction opposite to the retracted position of the focus lens group 204b. At this time, the image blur correction lens 321 moves with a maximum movable amount in a direction orthogonal to the optical axis of the lens barrel portion 204 and contacts the mechanical end. This can prevent the focus lens group 204b and the image blur correction lens 321 from interfering with each other due to an unexpected external force applied to the camera 200 during the collapsing operation.

  In step S509, the system control unit 201 determines whether or not the position of the image blur correction lens 321 in the optical axis direction with respect to the focus lens group 204b has moved from the closest position. Then, the system control unit 201 proceeds to step S510 if the image blur correction lens 321 has moved from the position closest to the focus lens group 204b in the optical axis direction, and otherwise, maximizes the energization amount. Meanwhile, the zoom operation is continued.

  In step S510, the system control unit 201 restores the amount of power supply to the lens barrel drive unit 203 that drives the image blur correction lens 321 to the amount of power supply before maximizing the amount of power supply through the lens barrel drive control unit 202, and then proceeds to step S511. move on.

  Here, assuming that the position of the image blur correction lens 321 in the optical axis direction has passed the position where the image blur correction lens 321 interferes with the focus lens group 204b, the energization amount to the lens barrel drive unit 203 driven by the image blur correction lens 321 is maximized. Return to the previous amount of electricity. In step S509, how far from the position where the image blur correction lens 321 comes closest to the focus lens group 204b to end the maximum energization is arbitrarily determined in advance in consideration of the mechanical configuration and the like.

  In step S511, the system control unit 201 determines whether the lens barrel unit 204 has reached the retracted position. If the lens barrel unit 204 has reached the retracted position, the process proceeds to step S512, and if it has not reached the retracted position, the zoom operation continues. When the lens barrel portion 204 reaches the retracted position, the image blur correction lens 321 is housed in the position before the retraction of the focus lens group 204b (see FIG. 3E).

  In step S512, the system control unit 201 sets the power supply amount to the lens barrel drive unit 203 that drives the image blur correction lens 321 by the lens barrel drive control unit 202 to the power supply amount designated during the collapse standby. Then, after the setting of the energization amount is completed, the system control unit 201 stops energization of the lens barrel driving unit 203 in accordance with the power supply sequence defined by the system, and ends the process.

  As described above, in the present embodiment, during the collapsing operation, the image blur correction lens 321 that moves away from the focus lens group 204b due to the positional relationship between the image blur correction lens 321 and the focus lens group 204b in the retracted position. Control the drive amount of. This can prevent the focus lens group 204b and the image blur correction lens 321 from interfering with each other due to an unexpected external force applied to the camera 200 during the collapsing operation.

  When an acceleration sensor or the like detects that an unexpected external force of a certain amount or more is applied to the camera 200 at a position other than the specific zoom position, the image blur correction is performed in the direction opposite to the retracted position of the focus lens group 204b as an emergency measure. The lens 321 may be moved.

  In addition to the position of the image blur correction lens 321 in the optical axis direction with respect to the focus lens group 204b, the position in the direction orthogonal to the optical axis is detected by a magnetic sensor or the like, and the position of the image blur correction lens 321 is detected based on the biaxial positional relationship. The drive amount may be changed.

(Second embodiment)
Next, a digital camera which is an example of the second embodiment of the image pickup apparatus of the present invention will be described with reference to FIGS. It should be noted that parts overlapping or corresponding to those of the above-described embodiment will be described by using the drawings and the reference numerals.

  In the present embodiment, lens barrel control will be described when the retracting operation of the image blur correction lens 321 with respect to the focus lens group 204b is not in time when an unexpected external force is applied to the camera 200 during the collapsing operation.

  FIG. 6 is a diagram showing a positional relationship between the focus lens group 204b and the image blur correction lens 321 during the retracting operation of the focus lens group 204b.

  FIG. 6A is a diagram showing the positional relationship between the focus lens group 204b and the image blur correction lens 321 at the wide position before the collapsing operation. FIG. 6B is a diagram showing a positional relationship in which the focus lens group 204b and the image blur correction lens 321 which are in the retracted position during the collapsing operation are close to each other in the optical axis direction.

  6C is an optical axis direction with the center of the focus lens group 204b in which the center of the image blur correction lens 321 is at the retracted position due to an unexpected external force applied to the camera 200 from the state of FIG. 6B. It is a figure which shows the state which overlapped. FIG. 6D is a diagram showing a state in which the image blur correction lens 321 is moved in the direction orthogonal to the optical axis from the state of FIG. 6C so as not to overlap the focus lens group 204b in the optical axis direction. is there. FIG. 6E is a diagram showing a retracted state in which the storage of the image blur correction lens 321 is completed. Note that FIGS. 6A, 6B, and 6E have been described with reference to FIGS. 3A, 3B, and 6E of the first embodiment, respectively. Since the contents are the same, the description thereof will be omitted.

  FIG. 6C shows a state in which the image blur correction lens 321 is close to the focus lens group 204b in the optical axis direction (see FIG. 6B). For example, the user shakes the camera 200 greatly to expect the camera 200. It shows the case where an external force is applied. In this case, the center of the focus lens group 204b and the center of the image blur correction lens 321 may overlap in the optical axis direction, and the image blur correction lens 321 may not be retracted in time for the collapsing operation.

  Whether or not the image blur correction lens 321 is retracted in time is determined based on the detection results of the positions of the focus lens group 204b and the image blur correction lens 321 in the optical axis direction and the positions in the direction orthogonal to the optical axis. If it is determined that the image blur correction lens 321 is not retracted in time, the retracting operation is temporarily stopped.

  The positions of the focus lens group 204b and the image blur correction lens 321 are detected by the same method as in the first embodiment. Further, the acceleration sensor detects the acceleration in the optical axis direction of the lens barrel portion 204 and the direction orthogonal to the optical axis, and the collapsing operation may be temporarily stopped when the detection result becomes a certain value or more. Good. Either or both of the detection methods can be used.

  In FIG. 6D, from the state of FIG. 6C, the image blur correction lens 321 is moved in a direction orthogonal to the optical axis with respect to the focus lens group 204b so as to be separated from the focus lens group 204b, and in the optical axis direction. I try not to overlap. After the movement of the image blur correction lens 321 is completed, the retracting operation that has been temporarily stopped is restarted. The operation after the restart is similar to that of the first embodiment.

  FIG. 7 is a flowchart illustrating a method for controlling the lens drive of the focus lens group 204b and the image blur correction lens 321 when the lens barrel 204 is retracted. Each processing shown in FIG. 7 is executed by the CPU or the like of the system control unit 201, for example, by expanding a program stored in the recording unit 209 in a RAM (not shown). Note that steps S701 to S708 and steps S713 to S716 of FIG. 7 are the same as the processing of steps S501 to S508 and steps S509 to S512 of the first embodiment (FIG. 3), respectively, and thus description thereof will be described. Omit it.

  7, in step S709, the system control unit 201 determines whether the image blur correction lens 321 can be retracted from the focus lens group 204b after the drive amount of the image blur correction lens 321 is maximized in step S708. To judge. Here, the position of the image blur correction lens 321 in the optical axis direction with respect to the focus lens group 204b is detected by counting the zoom pulses, as in the first embodiment, and the position in the direction orthogonal to the optical axis is the magnetic field. It is detected by the sensor. Based on the biaxial positional relationship between the image blur correction lens 321 and the focus lens group 204b, that is, based on the detection result of the count value of the zoom pulse and the detection result of the magnetic sensor, the image blur correction lens 321 with respect to the focus lens group 204b. It is determined whether the evacuation operation is possible.

  If the system control unit 201 determines that the image blur correction lens 321 can be retracted from the focus lens group 204b, the system control unit 201 proceeds to step S713, and determines that the retract operation is not in time (see FIG. 6C). ), The process proceeds to step S710.

  In step S710, the system control unit 201 controls the lens barrel drive unit 203 via the lens barrel drive control unit 202 to temporarily stop the zoom operation of the lens barrel unit 204, and proceeds to step S711.

  In step S711, the system control unit 201 controls the lens barrel drive unit 203 via the lens barrel drive control unit 202 to move the image blur correction lens 321 in the direction opposite to the retracted position of the focus lens group 204b in the direction orthogonal to the optical axis. And moves to the step S712. Here, the image blur correction lens 321 is moved in a direction orthogonal to the optical axis so as to be sufficiently separated from the focus lens group 204b.

  In step S712, the system control unit 201 controls the lens barrel drive unit 203 via the lens barrel drive control unit 202 to restart the zoom operation of the lens barrel unit 204, and proceeds to step S713. Other configurations and effects are similar to those of the first embodiment.

  The configuration of the present invention is not limited to those illustrated in the above embodiments, and the material, shape, size, form, number, arrangement location, etc. are appropriately changed without departing from the gist of the present invention. It is possible.

200 camera 201 system control unit 202 lens barrel drive control unit 203 lens barrel drive unit 204 lens barrel unit 204b focus lens group 204e image blur correction lens group 311 focus lens 321 image blur correction lens

Claims (7)

A first lens group that moves in a direction orthogonal to the optical axis when retracting and retracts from the optical axis;
The first lens group is provided so as to be movable in a direction parallel to the direction in which the first lens group moves during the collapsing operation, and is housed so as to overlap a part of the position before the first lens group retracts from the optical axis at the collapsing position. A second lens group,
Position detecting means for detecting the position of the second lens group with respect to the first lens group;
The second lens group with respect to the first lens group based on the detection result of the position of the second lens group with respect to the first lens group by the position detection means in the state where the first lens group is in the retracted position. A determining means for determining whether or not the optical axis is approaching to a preset position.
When the determination unit determines that the second lens group is approaching the set position, the driving unit that drives the second lens group is controlled to move the second lens group to the first lens group. Control means for moving in a direction away from,
The control means detects the drive amount of the second lens group in the direction away from the first lens group, and the result of detection of the positions of the first lens group and the second lens group in the optical axis direction by the position detection means. An image pickup apparatus, characterized in that the drive unit is controlled so as to be changed according to the above. When the second lens group moves in a direction away from the first lens group, the control means is responsive to the position of the second lens group in the direction of the optical axis detected by the position detection means. The image pickup apparatus according to claim 1, wherein an amount of electricity supplied to the drive unit that drives the second lens group is changed. Equipped with acceleration detection means,
When the acceleration detecting means detects that an acceleration equal to or higher than a certain level is applied, the control means controls a drive unit that drives the second lens group to separate the second lens group from the first lens group. the imaging apparatus according to claim 1 or 2, characterized in that moving direction. Wherein the control means, the detection result by the position detection hand stage,
The image pickup apparatus according to claim 3 , wherein the second lens group is moved to an end in a direction opposite to a direction in which the first lens group is retracted. A second position detecting means for detecting the direction of a position perpendicular to the optical axis of the front Stories second lens group,
Wherein, when the second lens group is determined to be close to the set position by the determining means, wherein the position of the optical axis of the second lens group by said position detecting means The drive unit is controlled so as to temporarily stop the movement of the second lens group based on the position of the second position detecting unit in the direction orthogonal to the optical axis. The imaging device according to any one of 4 above. The second lens group, the imaging apparatus according to any one of claims 1 to 5, characterized in that an image blur correction lens group. A first lens group that moves in a direction orthogonal to the optical axis when retracting and retracts from the optical axis, and a first lens group that is movable in a direction parallel to the direction that the first lens group moves during retracting operation Is a method for controlling the driving of the first lens group and the second lens group housed so as to overlap a part of the position before retracting from the optical axis,
A position detecting step of detecting the position of the second lens group with respect to the first lens group;
The second lens group with respect to the first lens group based on the detection result of the position of the second lens group with respect to the first lens group in the position detection step in the state where the first lens group is in the retracted position. A determination step of determining whether or not is approaching in the direction of the optical axis to a preset position,
When it is determined in the determination step that the second lens group is approaching the set position, the driving unit that drives the second lens group is controlled to move the second lens group to the first lens group. And a control step of moving in a direction away from,
The control step detects the drive amount of the second lens group in the direction away from the first lens group, and detects the position of the first lens group and the second lens group in the optical axis direction in the position detection step. A lens drive control method, characterized in that the drive unit is controlled so as to be changed according to a result.

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