JP2009162932A - Imaging device and lens device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce a focus detection error due to an operation of a vibration control system. <P>SOLUTION: An imaging device 101 includes a focus detection means 212 performing a focus detection operation using light from an imaging optical system, and a control means 217 controlling the operation of the vibration control system 202 detecting vibration and displacing a vibration control optical element in the imaging optical system. The control means limits the operation of the vibration control system during the focus detection operation so that the vibration control optical element 111 is displaced within a displacement allowable range smaller than that during a period other than the focus detection operation. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention provides an image pickup apparatus having a function of controlling a vibration isolation system that performs a focus detection operation using light from the image pickup optical system and displaces a vibration isolation optical element in the image pickup optical system, and the image pickup apparatus. The present invention relates to a lens device that can be mounted.

  In the imaging apparatus as described above, a plurality of images formed by light from the imaging optical system are photoelectrically converted by a light receiving sensor, and a focus detection operation is performed to obtain a phase difference (and defocus amount) of the plurality of images. . Then, the focus lens is moved based on the focus detection result to obtain in-focus. In this way, focus control, that is, autofocus (AF) is performed.

In the imaging apparatus disclosed in Patent Document 1, the operation of the image stabilization system is stopped during such AF. This is because the optical characteristics of the imaging optical system change by displacing the optical element in the imaging optical system, and as a result, an error may occur in the focus detection result. The greater the amount of displacement of the optical element, the greater the focus detection error.
JP 09-90457 A

  However, if the operation of the image stabilization system is completely stopped during AF as in the camera disclosed in Patent Document 1, the subject image observed by the finder during AF is shaken and a good observation state is obtained. I can't get it. In addition, if the subject image formed on the light receiving sensor fluctuates greatly, a focus detection error occurs as a result.

  The present invention provides an imaging apparatus capable of reducing a focus detection error due to an operation of an image stabilization system and a lens apparatus that is detachably attached to the imaging apparatus.

  An imaging apparatus according to one aspect of the present invention includes a focus detection unit that performs a focus detection operation using light from an imaging optical system, and a vibration isolation system that detects a shake and displaces a vibration isolation optical element in the imaging optical system. And control means for controlling the operation. The control means limits the operation of the image stabilization system so that the image stabilization optical element is displaced within a displacement allowable range smaller during the focus detection operation than when the focus detection operation is not performed.

  In addition, a lens apparatus that includes a changing unit that is detachably attached to the imaging device and that changes a displacement allowable range of the image stabilizing optical element in accordance with a command signal that restricts the operation of the image stabilizing system from the control unit. It constitutes another aspect of the invention.

  According to another aspect of the present invention, there is provided a method for controlling an image pickup apparatus, wherein the image stabilization optical element is displaced during a focus detection operation so that the image stabilization optical element is displaced within a smaller displacement allowable range than when the focus detection operation is not performed. It is characterized by limiting the operation of the system.

  According to the present invention, the anti-vibration optical element is allowed to displace within a smaller displacement tolerance range during the focus detection operation than when the focus detection operation is not being performed. For this reason, it is possible to observe a good finder image even during the focus detection operation, and to suppress the occurrence of a focus detection error due to a large image shake on the light receiving sensor.

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

  FIG. 2 shows a schematic configuration of a camera system including a single-lens reflex digital camera (imaging device) that is Embodiment 1 of the present invention.

  Reference numeral 101 denotes a single-lens reflex digital camera (hereinafter simply referred to as a camera), and reference numeral 113 denotes an interchangeable lens device (hereinafter simply referred to as an interchangeable lens) detachably attached to the camera 101.

  In the camera 101, 103 is a main mirror composed of a half mirror. As shown in the figure, the main mirror 103 has a down position that is disposed obliquely in an optical path from the imaging optical system in the interchangeable lens 113 (hereinafter referred to as an imaging optical path), and an up position that is retracted outside (upward) the imaging optical path. And can be rotated. The main mirror 103 disposed at the down position reflects a part of the light from the imaging optical system, guides it to the pentaprism 102, and transmits the remaining light. Further, as the main mirror 103 rotates to the up position, the light from the imaging optical system travels to a shutter unit 108 and an imaging element 104 described later.

  Reference numeral 105 denotes a sub mirror, which is disposed obliquely behind the main mirror 103 when the main mirror 103 is disposed at the down position, and retracts below the imaging optical path when the main mirror 103 is disposed at the up position. The light from the imaging optical system that has passed through the main mirror 103 disposed at the down position is reflected by the sub mirror 105 and guided to the focus detection unit 106 described later.

  The focus detection unit 106 is configured as shown in FIG. In FIG. 5, 0 is a subject, 1 is an imaging optical system, and 3 is a field lens disposed at or near the position of the planned imaging plane 2 of the imaging optical system 1. 4 and 5 are arranged so as to be symmetric with respect to the optical axis L of the imaging optical system 1, and form two images on two light fluxes passing through different regions 1a and 1b in the pupil of the imaging optical system 1. It is a secondary imaging lens. Reference numerals 6 and 7 denote line sensors as light receiving sensors that photoelectrically convert two images formed by the secondary imaging lenses 4 and 5. Each line sensor is configured by arranging a plurality of light receiving elements in an array.

  A mask 8 is provided in the vicinity of the secondary imaging lenses 4 and 5. The field lens 3 forms images of two light beams from different regions 1a and 1b in the pupil of the imaging optical system 1 on the line sensors 6 and 7 through two openings 8a and 8b formed in the mask 8, respectively.

  In such a focus detection unit 106, for example, when the imaging optical system 1 is in a so-called front pin state, the positions of the two images formed on the line sensors 6 and 7 by the secondary imaging lenses 4 and 5 are in focus. It shifts in the direction of the arrow with respect to the position of the two images in the state. Therefore, a defocus amount in the front pin direction of the imaging optical system 1 is obtained by obtaining a phase difference between these two images (two image signals corresponding to the charges accumulated by photoelectric conversion in the line sensors 6 and 7). Can be requested. In the case of the so-called rear pin state, the positions of the two images formed on the line sensors 6 and 7 are shifted in the forward and backward directions from the arrow direction with respect to the positions of the two images in the focused state. By obtaining the phase difference, the defocus amount in the rear pin direction of the imaging optical system 1 can be obtained.

  The focus detection unit 106 outputs two image signals output from the line sensors 6 and 7.

  In FIG. 2, reference numeral 107 denotes an eyepiece lens, which constitutes a finder optical system together with the pentaprism 102. The photographer can observe a subject image (finder image) formed by the imaging optical system through the eyepiece 107 and the pentaprism 102.

  A photometric sensor 115 receives a part of the light from the imaging optical system via the pentaprism 102 and detects the subject brightness.

  In the interchangeable lens 113, reference numeral 109 denotes a shake detection sensor that detects the shake of the interchangeable lens (or the camera 101), and includes an angular velocity sensor such as a vibration gyroscope. An acceleration sensor can also be used as the shake detection sensor 109.

  Reference numeral 111 denotes a correction lens as an anti-vibration optical element in the image pickup optical system, which is driven to be displaced in a direction orthogonal to the optical axis of the image pickup optical system in accordance with the shake detected by the shake detection sensor 109. In this embodiment, the case where the correction lens 111 is displaced in the direction orthogonal to the optical axis to perform image stabilization (image blur correction or image blur suppression) will be described. However, the correction lens is displaced in a direction other than the optical axis orthogonal direction. You may make it anti-vibration. Further, an optical element other than a lens may be used as the anti-vibration optical element.

  Reference numeral 110 denotes an aperture. A lens group 112 includes a variable power lens and a focus lens. The lens group 112, the diaphragm 110, and the correction lens 111 constitute an imaging optical system.

  When a release button (not shown) provided on the camera 101 is pressed halfway (first stroke), a photometric operation using the photometric sensor 115, an exposure calculation based on the photometric result, and a focus detecting operation using the focus detection unit 106 A focus operation based on the focus detection result is performed. When the release button is fully pressed (second stroke), the main mirror 103 and the sub mirror 105 are retracted to the outside of the imaging optical path (hereinafter referred to as mirror up operation), and the front curtain and rear of the shutter unit 108 are moved. The curtain operates (runs) and the image sensor 104 is exposed.

  The image sensor 104 is constituted by a CCD sensor or a CMOS sensor, and photoelectrically converts a subject image formed by the image pickup optical system. An image signal is generated by an image processing circuit (not shown) based on the output signal from the image sensor 104. The image signal is recorded on a recording medium (not shown) (semiconductor memory or the like) or displayed on a rear display (LCD or the like) (not shown) provided on the back of the camera 101.

  FIG. 1 shows an electrical configuration of the camera system shown in FIG. The camera 101 and the interchangeable lens 113 are electrically connected to each other through contacts 209a to 209d. The contact 209a is a power contact for supplying power from the power source 218 from the camera side to the lens side, and 209b is a ground contact.

  Reference numeral 209c denotes a clock contact for supplying a communication clock signal from the camera side to the lens side. 209d is a communication contact for transmitting command signals and data from the camera side to the lens side, and 209e is a communication contact for transmitting data from the lens side to the camera side.

  Hereinafter, the electrical configuration of the interchangeable lens 113 will be described. Reference numeral 202 denotes a shake correction system (anti-vibration system). The shake correction system 202 performs a filter process and an integration process on the shake detection sensor 206 corresponding to the shake detection sensor 109 shown in FIG. 2 and an output signal from the shake detection sensor 206, and the amount and direction of the shake. And a signal processing system 207 for generating a shake signal indicating The shake correction system 202 also includes a shake correction drive system 208 that displaces (drives) the correction lens 111 shown in FIG. 2 in the direction orthogonal to the optical axis based on the shake signal. The signal processing system 207 includes an image stabilization position sensor that detects the position of the correction lens 111, and corrects the shake signal so that the correction lens 111 is driven to a target position based on a signal from the image stabilization position sensor ( Feedback control).

  Reference numeral 203 denotes a zoom drive system that performs zooming by moving a zoom lens included in the lens group 112 shown in FIG. 2 in the optical axis direction. Reference numeral 204 denotes a focus drive system that performs focus adjustment by moving a focus lens included in the lens group 112 in the optical axis direction. Reference numeral 205 denotes an aperture driving system that drives the aperture 110 shown in FIG. 2 to change its aperture diameter.

  A lens microcomputer 201 controls operations of the shake correction system 202, the zoom drive system 203, the focus drive system 204, and the aperture drive system 205 in accordance with a command signal from a camera microcomputer 217 described later. In other words, the camera microcomputer 217 controls the operations of the shake correction system 202, the zoom drive system 203, the focus drive system 204, and the aperture drive system 205 via the lens microcomputer 201.

  In addition, the lens microcomputer 201 transmits the state (zoom position, focus position, aperture value, etc.) and optical information (open aperture value, focal length, focus calculation data, etc.) in the interchangeable lens 113 via the communication contact 209e. It transmits to the microcomputer 217.

  Next, the electrical configuration of the camera 101 will be described. Reference numeral 212 denotes a focus detection unit (focus detection means) including the focus detection unit 106 shown in FIG. The focus detection unit 212 performs a correlation operation on the plurality of image signals output from the focus detection unit 106 (line sensors 6 and 7), calculates a phase difference between these image signals, and further uses the imaging optical based on the phase difference. Find the defocus amount of the system. Then, the defocus amount information is transmitted to the camera microcomputer 217.

  Reference numeral 213 denotes a photometric unit (photometric means) including the photometric sensor 115 shown in FIG. 2, and generates a signal indicating subject luminance based on a signal from the photometric sensor 115. This signal is input to the camera microcomputer 217.

  Reference numeral 214 denotes a shutter unit that includes the shutter unit 108 shown in FIG. 2 and drives the shutter unit 108.

  Reference numeral 215 denotes a display unit that drives the above-described rear display and other display elements. The camera 101 is also provided with a control unit 216 that controls other operations of the camera 101 (such as operations of the mirrors 103 and 105).

  The camera microcomputer 217 serving as the focus adjustment unit and the control unit calculates the drive amount (including the drive direction) of the focus lens for obtaining the focus based on the defocus amount transmitted from the focus detection unit 212. Then, the calculated drive amount information is transmitted to the lens microcomputer 201 via the communication contact 209d. The lens microcomputer 201 moves the focus lens through the focus drive system 204 based on the received drive amount information. Thereby, focusing of the imaging optical system is obtained.

  Further, the camera microcomputer 217 calculates a target aperture value and a shutter time for obtaining appropriate exposure based on the subject luminance information from the photometry unit 213. The calculated target aperture value is transmitted to the lens microcomputer 201 via the communication contact 209d. The lens microcomputer 201 causes the diaphragm 110 to perform a diaphragm operation via the diaphragm drive system 205 based on the information on the target diaphragm value when the image sensor 104 is exposed (at the time of imaging). Further, the camera microcomputer 217 controls the shutter unit 108 through the shutter unit 214 during imaging based on the calculated shutter time.

  Further, the camera microcomputer 217 is configured to reduce the displacement allowable range of the correction lens 111 in the shake correction system 202 during the focus detection operation by the focus detection unit 212 to be smaller than that during the focus detection operation. Limit operation. More specifically, a request for limiting the operation of the shake correction system 202 is output to the lens microcomputer 201.

  Here, in the “focus detection operation” referred to in the present embodiment, photoelectric conversion is started at least in the line sensors 6 and 7 provided in the focus detection unit 106, and the accumulation of charges for obtaining a necessary image signal is completed. Charge storage operation up to. However, the “focus detection operation” may be performed until the completion of reading of electric charges (image signals) from the line sensors 6 and 7 or until calculation of the phase difference and the defocus amount is completed.

  Further, in this embodiment, from the start of the focus detection operation until the focus lens in the imaging optical system moves based on the focus detection result obtained by the focus detection operation, that is, the defocus amount, and the focus is obtained. Is called focus control. At this time, the camera microcomputer 217 may restrict the operation of the shake correction system 202 so that the allowable displacement range of the correction lens 111 is smaller during focus control than when the focus control is not being performed. In this case, in the following description, “focus detection operation” may be read as “focus control in progress”.

  Reference numeral 221 (SW1) denotes an imaging preparation switch, and 222 (SW2) denotes an imaging start switch. The imaging preparation switch 221 (SW1) is turned on by the first stroke operation of the release button described above, and the imaging start switch 222 (SW2) is turned on by the second stroke operation of the release button.

  Reference numeral 223 (SWM) denotes an imaging mode selection switch for selecting various imaging modes.

  224 (SWIS) is an IS selection switch for selecting whether or not to perform the image stabilization operation (hereinafter referred to as IS operation) of the shake correction system 202. When executing the IS operation, the switch 224 may be turned on.

  FIG. 3 shows a specific configuration example of the shake correction system 202. The shake correction system 202 drives the correction lens 111 in two directions (pitch direction P and yaw direction Y) orthogonal to the optical axis and orthogonal to each other, but the correction lens 111 is driven in the same direction in both directions. Therefore, only the driving in the pitch direction P will be described here. The components related to the driving in the pitch direction P are denoted by P at the end of the symbol, and the components related to the driving in the yaw direction Y are denoted by Y at the end of the symbol.

  In FIG. 3, the lens holding frame 401 that holds the correction lens 111 can move along the pitch slide shaft 403P via the sliding bearing 402P. The pitch slide shaft 403P is attached to the intermediate arm 404. The intermediate arm 404 is held movably in the yaw direction Y by a fixed frame 406 via a yaw slide shaft 403Y.

  A coil 405P is attached to the lens holding frame 401. A magnetic circuit composed of a yoke 407P and a permanent magnet 408P is fixed to the fixed frame 406. The lens holding frame 401 is driven in the pitch direction P by energizing the coil 405P.

  A slit 410P, a condenser lens 411P, and an infrared light emitting diode (IRED) 412P are accommodated in a hole 409P provided in the lens holding frame 401. A light receiving element (PSD) 413P is fixed at a position facing the slit 410P on the fixed frame 406. Near-infrared light emitted from the IRED 412P passes through the slit 410P and is projected onto the PSD 413P. When the PSD 413P outputs a signal corresponding to the position of the received near-infrared light, the position of the lens holding frame 401, that is, the correction lens 111 in the pitch direction P can be detected. The slit 410P, the condenser lens 411P, the infrared light emitting diode (IRED) 412P, and the PSD 413P constitute a position detection mechanism for the correction lens 111.

  The output of the PSD 413P is amplified by the amplifier 414P and input to the coil 405P through the drive circuit 415P. Thereby, the lens holding frame 401 is driven in the pitch direction P, and the output of the PSD 413P changes. The lens holding frame 401 is stable at a neutral point where the output of the PSD 413P becomes zero. The output of the pitch shake detection sensor 416P corresponding to the shake detection sensor 206 shown in FIG. 1 (more precisely, the shake signal generated from the output) is added to the output of the amplifier 414P. As a result, the drive circuit 415P controls the energization amount to the coil 405P, and drives the lens holding frame 401, that is, the correction lens 111, according to the shake amount.

  In this embodiment, as described above, the IS of the shake correction system 202 is set so that the allowable displacement range of the correction lens 111 (lens holding frame 401) during the focus detection operation is smaller than that during the focus detection operation. Limit operation. Hereinafter, a method for limiting the IS operation will be described.

  In this embodiment, as a method of restricting the IS operation, the displacement amount from the neutral point of the correction lens 111 detected by using the position detection mechanism of the correction lens 111 described above is limited so as to be within a predetermined allowable displacement range. Adopt the method of applying. The allowable displacement range of the correction lens 111 when the focus detection operation is not being performed is the maximum range in which the displacement is allowed mechanically or electrically in the shake correction system 202, and the displacement of the correction lens 111 during the focus detection operation is not limited. The allowable amount range is a range smaller than the maximum range.

  Further, the restriction of the IS operation is performed according to the restriction request communicated from the camera microcomputer 217 to the lens microcomputer 201 as the changing means and the information on the allowable displacement range. That is, the camera microcomputer 217 is a main body that restricts the IS operation.

  Further, the camera microcomputer 217 changes the allowable displacement range of the correction lens 111 during the focus detection operation according to the subject luminance (photometric value) detected by the photometric unit 213.

  If the photometric value is small, that is, if the subject brightness is low (dark), the two images formed on the line sensors 6 and 7 provided in the focus detection unit 106 are also dark, so the charge necessary to generate an image signal Accumulation time becomes longer. If the charge accumulation time of the line sensors 6 and 7 is long, there is a high possibility that the correction lens 111 moves greatly due to the IS operation during the focus detection operation (during the charge accumulation operation of the line sensors 6 and 7). When the correction lens 111 moves greatly, the optical characteristics of the imaging optical system deviate from symmetrical characteristics with the optical axis as the center, so that changes occur in the two images formed on the line sensors 6 and 7. As a result, an error occurs in the focus detection result.

  Therefore, in this embodiment, the IS operation is limited so that the allowable range of displacement of the correction lens 111 during the focus detection operation becomes smaller as the photometric value is smaller.

  If the IS operation is allowed in the maximum range during the focus detection operation as in the case where the focus detection operation is not being performed, the focus detection error is caused when the correction lens 111 is moved largely, as in the case where the subject brightness is low. Arise. On the other hand, if the IS operation is not performed at all during the focus detection operation, a focus detection error occurs due to image shake on the line sensors 6 and 7 caused by a large camera shake during the focus detection operation. In addition, when the subject image is observed with the finder optical system (or the electronic finder when the rear display is used as an electronic finder) during the focus detection operation, image blurring occurs in the finder and a good subject is obtained. The image cannot be observed.

  Therefore, in this embodiment, during the focus detection operation, the IS operation is allowed in a smaller displacement allowable range than when the focus detection operation is not being performed, thereby reducing the focus detection error and obtaining a good subject image by the finder. To be able to observe The allowable displacement range of the correction lens 111 during the focus detection operation is, for example, 2/3, 1/2, or 1/3 when the focus detection operation is not being performed. An arbitrary range that does not easily occur may be set.

  When the IS operation is not performed, the correction lens 111 is fixed (locked) so that the center thereof is positioned on the optical axis of the imaging optical system so that the correction lens 111 is not displaced by various vibrations. There is a need. Therefore, the shake correction system 202 is provided with a lock mechanism that locks the correction lens 111 so that the center thereof is positioned on the optical axis of the imaging optical system.

  In FIG. 3, the lens holding frame 401 is formed with a conical concave portion 417, and the lock member 418 is formed with a conical convex portion 418 a. When locking the correction lens 111, the locking member 418 is moved in the direction of 419 in the drawing, and the convex portion 418 a is engaged with the concave portion 417. Thereby, the movement of the correction lens 111 (lens holding frame 401) in the pitch direction P and the yaw direction Y can be prevented, and the correction lens 111 is fixed (locked) so that the center thereof is located on the optical axis of the imaging optical system. Can be kept.

  In order to release the lock, the lock member 418 is moved in the direction of 420 in the figure, and the convex portion 418a is detached from the concave portion 417.

  Next, the operations of the camera microcomputer 217 and the lens microcomputer 201 will be described using the flowchart of FIG. This operation is executed according to a computer program stored in the camera microcomputer 217 and the lens microcomputer 201.

  Here, description will be made assuming that the IS selection switch SWIS is ON and execution of the IS operation is selected. Further, here, not only “during focus detection operation” but also “during focus control” from the start of the focus detection operation to “focus control”, the allowable displacement range of the correction lens 111 (hereinafter referred to as IS allowable range). A case where the value is made smaller than the IS allowable range in other states will be described.

  First, the operation of the camera microcomputer 217 will be described.

  In step S101, the camera microcomputer 217 detects the state of the imaging preparation switch SW1. If the switch SW1 is ON, the process proceeds to step S102, and a lens information transmission request is transmitted to the lens microcomputer 201. This communication is for obtaining information necessary for performing automatic exposure calculation (AE) and autofocus (AF).

  In step S <b> 103, the camera microcomputer 217 acquires lens information (focal length, focus sensitivity, open F number, maximum IS allowable range of the correction lens 111, etc.) from the lens microcomputer 201.

  Next, in step S104, the camera microcomputer 217 causes the photometry unit 213 to perform photometry operation.

  In step S105, the camera microcomputer 217 allows the displacement of the correction lens 111 during the focus detection operation (or during focus control: the same applies hereinafter) based on the lens information obtained in step S103 and the photometric value obtained in step S104. Set the range. For example, when the photometric value is higher than a predetermined value, the IS allowable range during the focus detection operation is set to ½ that when the focus detection operation is not being performed. When the photometric value is lower than the predetermined value, the IS allowable range during the focus detection operation is set to 2/3 when the photometric value is higher than the predetermined value. These IS allowable range setting values are examples, and other setting values may be used.

  In step S106, the camera microcomputer 217 transmits the IS allowable range during the focus detection operation set in step S105 to the lens microcomputer 201.

  In step S107, the camera microcomputer 217 transmits an IS operation start request (IS drive request) to the lens microcomputer 201.

  Next, in step S108, the camera microcomputer 217 transmits an IS drive restriction request to the lens microcomputer 201. The IS drive restriction request is a command signal for requesting that the IS allowable range during the focus detection operation set in step S105 is applied to the shake correction system 202 (IS operation is restricted).

  In step S109, the camera microcomputer 217 causes the focus detection unit 212 to perform a focus detection operation. Thereby, information on the defocus amount of the imaging optical system is acquired. During this time, the IS tolerance range during the focus detection operation is applied to the shake correction system 202, and even if the shake occurs, the correction lens 111 is displaced only within the IS tolerance range.

  In step S110, the camera microcomputer 217 calculates the focus lens drive amount from the defocus amount obtained in step S109. Then, a focus drive request (focus lens drive request) is transmitted to the lens microcomputer 201 together with the drive amount information.

  In step S <b> 111, the camera microcomputer 217 determines whether a signal indicating completion of focus lens focusing drive has been transmitted from the lens microcomputer 201. If the signal has been transmitted, the process proceeds to step S112. If the signal has not been transmitted, this step is repeated.

  In step S112, the camera microcomputer 217 causes the focus detection unit 212 to perform the focus detection operation again, and determines whether the focus is in focus or not based on whether the defocus amount is smaller than a predetermined value. If it is out of focus, the process returns to step S109 to step S112, and focus detection, focus lens drive, and in-focus / in-focus determination are performed again. If it is determined in step S112 that focus is achieved (focus is obtained), the focus control is terminated and the process proceeds to step S113.

  In step S113, the camera microcomputer 217 transmits to the lens microcomputer 201 a command signal for canceling the application of the IS allowable range (IS drive restriction) during the focus detection operation. Thereby, during the imaging operation performed thereafter, the correction lens 111 can be displaced within its maximum IS allowable range, so that a good anti-vibration performance can be obtained even for a large shake.

  Next, in step S114, the camera microcomputer 217 determines whether the imaging start switch SW2 is turned on. When the switch SW2 is ON, the process proceeds to step S115, and an imaging operation for acquiring a recording image including an operation of raising the mirrors 103 and 105, an operation of reducing the aperture 110 to the target aperture value, and an operation of the shutter unit 108 is performed. Let it be done.

  Subsequently, in step S116, the camera microcomputer 217 transmits an IS operation stop request (IS drive stop request) to the lens microcomputer 201. Then, the operation ends (returns to step S101).

  Next, the operation of the lens microcomputer 201 will be described.

  In step S201, the lens microcomputer 201 determines whether a lens information transmission request is received from the camera microcomputer 217. If received, the process proceeds to step S202. If not received, this step is repeated.

  In step S202, the lens microcomputer 201 transmits lens information to the camera microcomputer 217.

  In step S203, the lens microcomputer 201 determines whether or not the IS allowable range during the focus detection operation has been received from the camera microcomputer 217. If received, the process proceeds to step S204, and if not received, this step is repeated.

  In step S204, the lens microcomputer 201 determines whether an IS drive request is received from the camera microcomputer 217. If received, the process proceeds to step S205, and if not received, this step is repeated.

  In step S205, the lens microcomputer 201 starts an IS operation (IS drive).

  In step S206, the lens microcomputer 201 determines whether an IS drive restriction request has been received from the camera microcomputer 217. If received, the process proceeds to step S207, and if not received, this step is repeated.

  In step S207, the lens microcomputer 201 applies the IS allowable range during the focus detection operation received in step S203 to the shake correction system 202. Accordingly, the shake correction system 202 performs the IS operation in a range smaller than the IS allowable range when the focus detection operation is not being performed.

  In step S208, the lens microcomputer 201 determines whether or not a focus drive request has been received from the camera microcomputer 217. If received, the process proceeds to step S209. If not received, this step is repeated.

  In step S209, the lens microcomputer 201 moves the focus lens via the focus drive system 204 based on the focus lens drive amount information received together with the focus drive request.

  In step S210, the lens microcomputer 201 determines whether or not the focus lens drive in step S209 has been completed. If completed, the process proceeds to step S211, and a signal indicating completion of focusing drive is transmitted to the camera microcomputer 217.

  Next, in step S212, the lens microcomputer 201 determines whether or not an IS drive restriction release command signal has been received from the camera microcomputer 217. If received, the process proceeds to step S213, and if not received, this step is repeated.

  In step S213, the lens microcomputer 201 cancels the IS allowable range during the focus detection operation set in step S207. This enables an imaging operation while performing an IS operation within a maximum IS allowable range that is larger than the IS allowable range during the focus detection operation.

  In step S214, the lens microcomputer 201 determines whether an IS drive stop request is received from the camera microcomputer 217. If received, the process proceeds to step S215. If not received, this step is repeated.

  In step S215, the lens microcomputer 201 stops the IS operation.

  As described above, in this embodiment, during the focus detection operation, the IS operation is limited so that the correction lens 111 is displaced within an IS allowable range that is smaller than when the focus detection is not being performed. Thereby, it is possible to maintain a good viewfinder observation image while suppressing a focus detection error as much as possible. In addition, since the IS allowable range is set larger during the imaging than during the focus detection operation, the imaging operation can be performed while obtaining a good anti-vibration performance against a large shake.

  In this embodiment, the case where the IS operation is limited so that the displacement detected by the position detection mechanism of the correction lens 111 is within a predetermined IS allowable range during the focus detection operation has been described. It is also possible to limit the IS operation by this method. For example, the displacement amount of the correction lens 111 is set within a predetermined IS allowable range by setting the allowable value of the energization amount (current value) to the coils 405P and 405Y shown in FIG. 3 to be lower than that during the focus detection operation. It can also be inside.

  Each embodiment described above is only a representative example, and various modifications and changes can be made to each embodiment in carrying out the present invention.

  For example, in this embodiment, a single-lens reflex digital camera has been described. However, the present invention can also be applied to a camera integrated with an imaging lens. In this embodiment, the case where the image stabilization system is mounted on the interchangeable lens has been described. However, the image stabilization adapter (lens device) is mounted between the single lens reflex camera and the interchangeable lens or attached to the interchangeable lens. The present invention can also be applied to a case where it is mounted on a).

  In the present embodiment, a camera (imaging apparatus) provided with a focus detection unit separately from the image sensor has been described. However, the present invention is a line sensor in which a pixel row or a pixel group of a part of the image sensor is used as a light receiving element. The present invention can also be applied to an imaging device used as the above.

1 is a block diagram showing an electrical configuration of a single-lens reflex digital camera system that is an embodiment of the present invention. Schematic which shows the optical structure of the single-lens reflex digital camera system of an Example. FIG. 3 is an exploded perspective view illustrating a configuration of a shake correction system according to the embodiment. 6 is a flowchart for explaining operations of a camera microcomputer and a lens microcomputer in the embodiment. Sectional drawing which shows the structure of the focus detection unit of an Example.

Explanation of symbols

6, 7 Line sensor 101 Camera 104 Image sensor 106 Focus detection unit 109, 206 Shake detection sensor 111 Correction lens 113 Interchangeable lens 201 Lens microcomputer 202 Shake correction system 207 Signal processing system 208 Shake correction drive system 212 Focus detection unit 213 Photometry unit

Claims (5)

Focus detection means for performing a focus detection operation using light from the imaging optical system;
Control means for controlling the operation of the image stabilization system that detects vibration and displaces the image stabilization optical element in the imaging optical system,
The control means limits the operation of the image stabilization system during the focus detection operation so that the image stabilization optical element is displaced within a displacement allowable range smaller than when the focus detection operation is not performed. An imaging device. A focus adjusting means for moving a focus lens of the imaging optical system based on a focus detection result obtained by the focus detection operation;
During the focus control from the focus detection operation until the in-focus state is obtained by the movement of the focus lens, the anti-vibration optical element is displaced within a smaller displacement allowable range than when the focus control is not being performed. The image pickup apparatus according to claim 1, wherein the operation of the image stabilization system is limited to be performed. Having photometric means for detecting subject brightness,
The imaging apparatus according to claim 1, wherein the control unit changes the allowable displacement range according to a photometric result obtained by the photometric unit. A lens apparatus that is detachably attached to the imaging apparatus according to any one of claims 1 to 3,
The imaging optical system including the anti-vibration optical element;
The vibration isolation system;
A lens apparatus comprising: a changing unit that changes a displacement allowable range of the image stabilizing optical element in accordance with a command signal that restricts the operation of the image stabilizing system from the control unit. A method for controlling an image pickup apparatus that performs a focus detection operation using light from an image pickup optical system, detects a shake, and displaces an image pickup optical element in the image pickup optical system to control an operation of the image pickup system.
Control of the image pickup apparatus is characterized in that during the focus detection operation, the operation of the image stabilization system is limited so that the image stabilization optical element is displaced within a displacement allowable range smaller than when the focus detection operation is not performed. Method.