JP2020140020A - Camera, lens unit, camera system, and control method - Google Patents

Abstract

To correct an image blur while suppressing a continuous shooting speed of continuous shooting photography from decreasing.SOLUTION: The present invention relates to a camera 100 used for a camera system 10 which performs, for image blur correction, first control to move one of first correction means 104 of the camera 100 and second correction means 113 of a lens unit and stop the other, or second control to move the first correction means and the second correction means. Control means 102 of the camera 100 performs, in continuous shooting photography to perform imaging for recording a plurality of times with a single photography indication, control responsive to the first control before the continuous shooting photography and control responsive to the second control in the continuous shooting photography.SELECTED DRAWING: Figure 1

Description

The present invention relates to a camera, a lens device, a camera system, and a control method.

A camera system is known that uses a correction lens in a lens device and an image sensor in a camera to correct image blur caused by camera shake or the like.

Patent Document 1 describes a camera that corrects image blur by moving only the correction lens before the start of imaging for recording, and corrects image blur by co-controlling the correction lens and the image sensor during imaging for recording. The system is described. It also describes centering to move the correction lens to the reference position at the start of imaging.

JP-A-2009-265182

However, if the correction lens is centered at each imaging in the continuous shooting mode in which imaging for recording is performed a plurality of times in succession, the number of imagings per unit time (hereinafter referred to as continuous) is caused by waiting for the completion of the centering. There may be a decrease in shooting speed).

The present invention has been made in view of the above problems, and an object of the present invention is to provide a camera, a lens device, a camera system, and a control method capable of correcting image blur while suppressing a decrease in continuous shooting speed in continuous shooting. And.

The camera of the present invention moves one of the first correction means of the camera and the second correction means of the lens device that can be attached to and detached from the camera for image blur correction in a predetermined axial direction. A camera used in a camera system that performs a first control for stopping the other or a second control for moving the first correction means and the second correction means.
It has a control means for controlling the position of the first correction means, and the control means responds to the first control before continuous shooting in which a plurality of recording images are taken with one shooting instruction. It is characterized in that control is performed and control is performed according to the second control during the continuous shooting.

In the lens device of the present invention, one of the first correction means of the camera and the second correction means of the lens device that can be attached to and detached from the camera is moved for image blur correction in a predetermined axial direction. A lens device used in a camera system that performs a first control for stopping the other, or a second control for moving the first correction means and the second correction means, and is the second correction. The control means has a control means for controlling the position of the means, and the control means performs control according to the first control before continuous shooting in which a plurality of recording images are taken with one shooting instruction. It is characterized in that control is performed according to the second control during continuous shooting.

The camera system of the present invention includes a camera and a lens device, the camera has a first correction means that can be moved for image blur correction, and the lens device is movable for image blur correction. A camera system having a second correction means,
In order to correct image blur in a predetermined axis direction, one of the first correction means and the second correction means is moved before continuous shooting in which multiple recording images are taken with one shooting instruction. It is characterized in that a first control for causing and stopping the other is performed, and a second control for moving the first correction means and the second correction means is performed during the continuous shooting.

According to the camera, the lens device, the camera system, and the control method according to the present invention, image blur correction can be performed while suppressing a decrease in the continuous shooting speed in continuous shooting.

The figure which shows the structure of the camera system which concerns on this embodiment. The figure which shows the structure for image blur correction control which concerns on 1st Embodiment. The timing chart of the image blur correction control according to the first embodiment. The flowchart regarding image blur correction control which concerns on 1st Embodiment. The figure which shows the structure for image blur correction control which concerns on 2nd Embodiment. The timing chart of the image blur correction control according to the second embodiment. The flowchart regarding image blur correction control which concerns on 2nd Embodiment.

Hereinafter, the camera system according to the embodiment of the present invention will be described in detail with reference to the accompanying drawings. In each figure, the same components are designated by the same reference numerals, and duplicate description will be omitted.

(Camera system configuration)
First, the configuration of the camera system 10 common to each embodiment will be described with reference to FIG.

The camera system 10 includes a lens device 101 (optical device) and a camera body 100 (optical device). The lens device 101 may be an interchangeable lens that can be attached to and detached from the camera body 100, or may be integrally configured with the camera body 100.

The camera body 100 includes a camera control unit 102, an operation unit 103, an image sensor 104, a camera side terminal 105, a gyro sensor 106, an actuator 107, a position sensor 108, a display element 115, and a storage unit 116.

The camera control unit 102 is a control means for controlling each member of the camera body 100, and has a CPU (Central Processing Unit) and a memory. For example, according to the operation of the operation units 103 and 103a, control such as automatic focusing control, automatic exposure control, imaging, and image blur correction can be performed, or the camera side terminal 105 connected to the lens side terminal 111 of the lens device 101. It communicates with the lens control unit 109 via. The camera control unit 102 performs image blur correction control (vibration isolation control) by reading and executing a program stored in the storage unit 116. At this time, it functions as a control means for controlling the position of the image sensor 104 for image blur correction control in the camera system 10, or as a determination means for determining whether or not continuous shooting is performed.

The operation unit 103 is an interface that can be operated by the user. The operation unit 103 is an operation member used for a shooting instruction and a shooting mode instruction, and is, for example, a release button, a switch, or the like. The operation unit 103 can be operated in two stages, and when the switch SW1 in the first stage is turned on, the camera body 100 starts an imaging preparation operation such as automatic focusing control and automatic exposure control. When the switch SW2 in the second stage is turned on, the camera control unit 102 determines the focusing position and the exposure, and starts imaging (exposure) on the image sensor 104.

Here, when the operation unit 103 is a release button, the switch SW1 is turned on when the release button is half-pressed, and the switch SW2 is turned on when the release button is fully pressed. Note that "imaging" here means acquiring a still image or moving image for recording, and acquiring a subject image for a live view image is not included in imaging.

The operation unit 103a is an operation member used for setting a shooting mode, and is, for example, a mode dial or a touch panel. The shooting mode includes at least a single shooting mode and a continuous shooting mode for still image shooting. Here, the single-shot shooting mode is a mode in which one shooting instruction is used to perform one recording imaging (exposure), and the continuous shooting shooting mode is a mode in which one shooting instruction is used to continuously perform a plurality of recording imaging (exposure). This is a mode in which exposure) can be performed. As a shooting mode that can be set via the operation unit 103a, a moving image shooting mode may be further included.

The image pickup element 104 is a photoelectric conversion element such as a CCD sensor or a CMOS sensor, and a subject image formed by the photographing optical system 113a of the lens device 101 is photoelectrically converted based on an instruction from the camera control unit 102 to obtain an imaging signal. Generate. The image sensor 104 also functions as a movable correction means for image blur correction.

The gyro sensor 106 detects the vertical (pitch direction) and horizontal (yaw direction) shakes of the camera body 100 caused by camera shake or the like as angular velocity signals, and outputs them to the camera control unit 102.

The display element 115 displays an image corresponding to the image pickup signal generated by the image pickup device 104. For example, a live view image is displayed before imaging, and an captured still image is displayed after imaging.

The actuator 107 is a motor such as an ultrasonic motor, which is driven based on an instruction from the camera control unit 102, and moves the image pickup element 104 in a plane orthogonal to the optical axis for image blur correction (XY in FIG. 1). Move on a plane). The optical axis refers to the optical axis of the photographing optical system 113a when anti-vibration control is not performed. Further, an actuator for performing image blur correction in the roll direction (rotation direction centered on the Z axis in FIG. 1) using the image sensor 104 may be provided.

The position sensor 108 detects the position of the image sensor 104 and outputs it to the camera control unit 102.

The camera control unit 102 corrects image blur using the image sensor 104, the gyro sensor 106, and the actuator 107. The camera control unit 102 determines the target position of the image sensor 104 required to reduce the image blur based on the angular velocity signal output from the gyro sensor 106. Then, the position feedback control of the image sensor 104 is performed via the actuator 107 based on the target position and the actual position of the image sensor 104 obtained from the position sensor 108.

The storage unit 116 is an information storage medium such as a ROM (Read Only Memory), and stores at least the program shown in the camera-side processing of the flowcharts of FIGS. 4 and 7 described later.

The lens device 101 includes a lens control unit 109, a gyro sensor 110, a lens side terminal 111, an actuator 112, a photographing optical system 113a including a correction lens 113, a position sensor 114, and a storage unit 117.

The lens control unit 109 is a control means for controlling each member of the lens device 101, and has a CPU and a memory. Further, it is possible to communicate with the camera control unit 102 via the camera side terminal 105. The lens control unit 109 performs image blur correction control (vibration isolation control) by reading and executing a program stored in the storage unit 117. That is, it functions as a control means for controlling the position of the correction lens 113 for image blur correction control in the camera system 10.

The gyro sensor 110 detects the vertical (pitch direction) and horizontal (yaw direction) shakes of the camera body 100 caused by camera shake or the like as angular velocity signals, and outputs them to the lens control unit 109. It is assumed that the offset between the gyro sensor 106 and the gyro sensor 110 is corrected so that the output from the gyro sensor 106 and the output from the gyro sensor 110 are the same with respect to the camera shake with respect to the camera system 10.

The actuator 112 is a motor such as an ultrasonic motor, and is driven based on an instruction from the lens control unit 109 to move the correction lens 113 in the X-axis and Y-axis directions for image blur correction.

The photographing optical system 113a forms a subject image on the image pickup device 104. The correction lens 113 is a part of the photographing optical system 113a and functions as a movable correction means for image blur correction.

The position sensor 114 detects the position of the correction lens 113 and outputs the position to the lens control unit 109.

The lens control unit 109 corrects image blur using the correction lens 113, the gyro sensor 110, and the actuator 112. The lens control unit 109 determines the target position of the correction lens 113 necessary for reducing the image blur based on the angular velocity signal output from the gyro sensor 110. Then, the position feedback control of the correction lens 113 is performed via the actuator 112 based on the target position and the actual position of the correction lens 113 obtained from the position sensor 114.

The storage unit 117 is an information storage medium such as a ROM, and stores at least the program shown in the lens-side processing of the flowcharts of FIGS. 4 and 7 described later.

In the camera system 10 according to the present embodiment, the camera control unit 102 and the lens control unit 109 cooperate to change the image formed by the photographing optical system 113a and the relative position of the image sensor 104 in the direction orthogonal to the optical axis. Perform blur correction. Specifically, the camera control unit 102 and the lens control unit 109 appropriately control the movement timing and movement amount of the image sensor 104 and the correction lens 113 according to the shooting mode and the imaging sequence to correct the image blur. It has been realized. When both the correction lens 113 and the image sensor 104 are moved based on a predetermined correction ratio, it is possible to obtain a larger maximum image blur correction amount than when image blur correction is performed by only one of them.

[First Embodiment]
In the camera system 10 according to the first embodiment, the image sensor 104 and the correction lens 113 perform image blur correction at a predetermined correction ratio during continuous shooting. The predetermined correction ratio is constant during image blur correction. In the present specification, the term “during continuous shooting” means during a plurality of imagings and between each imaging in the continuous shooting in which the imaging for recording is performed a plurality of times with one shooting instruction.

A configuration for image blur correction control in the camera system 10 according to the first embodiment will be described with reference to FIG.

The camera control unit 102 includes an offset removing unit 202, an angle conversion unit 203, a camera-side transmitting unit 204, a camera-side receiving unit 205, a determining unit 206, and a drive control unit 207.

The angular velocity signal from the gyro sensor 106 has the offset component removed by the offset removing unit 202 and converted into an angular signal by the angle conversion unit 203.

The camera-side transmitting unit 204 transmits information to the lens control unit 109, and the camera-side receiving unit 205 receives information from the lens control unit 109. The camera-side transmitting unit 204 and the camera-side receiving unit 205 transmit and receive information via the camera-side terminal 105.

The determination unit 206 determines the control characteristics of the image sensor 104 based on the operation on the operation unit 103. The control characteristics will be described later. The determination unit 206 further sets the continuous shooting flag ON or OFF, and sets the switch SW2-1 and the switch SW2-2, which will be described later, ON or OFF.

The drive control unit 207 generates a drive signal of the actuator 107 according to the control characteristic determined by the determination unit 206, and outputs the drive signal to the actuator 107. In the control characteristic for image blur correction (SW2 characteristic described later), a drive signal corresponding to the movement direction and movement amount of the image sensor 104 calculated based on the angle signal output from the angle conversion unit 203 is output.

The lens control unit 109 includes an offset removal unit 209, an angle conversion unit 210, a lens side transmission unit 211, a lens side reception unit 212, a determination unit 213, and a drive control unit 214.

The angular velocity signal from the gyro sensor 110 has an offset component removed by the offset removing unit 209, and is converted into an angular signal by the angle conversion unit 210.

The lens-side transmitting unit 211 transmits information to the camera control unit 102, and the lens-side receiving unit 212 receives information from the camera control unit 102. The lens-side transmitting unit 211 and the lens-side receiving unit 212 transmit and receive information via the lens-side terminal 111.

The determination unit 213 determines information regarding the correction ratio between the image sensor 104 and the correction lens 113. The information regarding the correction ratio between the image sensor 104 and the correction lens 113 may be the ratio of the correction amount between the image sensor 104 and the correction lens 113, or the ratio of the image blur correction by the image sensor 104 to the total image blur and the total image. It may be the ratio of the image blur correction by the correction lens 113 to the blur correction. These correction ratios and correction ratios may be calculated based on the amount of movement of the image at the time of correction, or may be calculated based on the correction angle corresponding to the amount of movement of the image at the time of correction. It may be. Further, the control characteristic of the correction lens 113 is determined based on the state of the switch notified from the camera control unit 102. The control characteristics will be described later.

The drive control unit 214 generates a drive signal of the actuator 112 according to the control characteristic determined by the determination unit 213, and outputs the drive signal to the actuator 112. In the control characteristic for image blur correction, a drive signal calculated based on the angle signal output from the angle conversion unit 210 is output.

Next, the image blur correction control in the camera system 10 will be described.

In the camera system 10, the first control, the second control, and the third control are performed as the control of the image blur correction.

The first control is a control in which the image sensor 104 is stopped at a reference position and the correction lens 113 is moved for image blur correction.

The second control is a control for moving the image sensor 104 and the correction lens 113 for image blur correction. In particular, the image sensor 104 and the correction lens 113 are moved according to a predetermined correction ratio.

The third control is a control in which the image sensor 104 is centered to be moved toward the reference position and the correction lens 113 is moved to correct the image blur. For simplification of the explanation, the reference position for centering is the center position of the movable range of the image sensor 104, but the reference position does not necessarily have to be the center position of the movable range. If the center position of the image circle of the photographing optical system 113a and the center position of the movable range of the image sensor 104 are deviated from each other in the XY plane, the reference position of centering is the center position of the image circle in the optical axis direction. It is preferable that the position overlaps with.

FIG. 3 is a timing chart of the image blur correction control according to the first embodiment. The horizontal direction represents the time axis, and shows the control contents of the image sensor 104 and the correction lens 113 in continuous shooting in which images are taken three times while the operation unit 103 is pressed.

The switch SW2-1 and the switch SW2-2 indicate the ON / OFF state of the switch managed by the camera control unit 102. The switch SW2-1 is a switch indicating the start of preparation for imaging, and is turned on when the release button of the operation unit 103 is fully pressed, that is, when the switch SW2 is turned on, and the timing at which one imaging is completed. Turns off. If the release button is fully pressed even after the end of imaging and the camera control unit 102 determines that continuous shooting is performed, the camera control unit 102 turns ON again after a predetermined time has elapsed from the end of the previous imaging. The switch SW2-2 is a switch indicating the start of actual imaging (exposure), and the switch SW2-2 is also turned ON when a predetermined time has elapsed after the switch SW2-1 is turned ON. The switch SW2-2 is also turned off at the timing when one imaging is completed.

If the release button is fully pressed even after the end of imaging and the camera control unit 102 determines that continuous shooting is being performed, the switch SW2-2 also changes after a predetermined time has elapsed since the switch SW2-1 was turned on again. It turns on again. ON / OFF of the switch SW1, the switch SW2-1, and the switch SW2-2 is notified from the camera control unit 102 to the lens control unit 109 via the camera side transmission unit 204 and the lens side reception unit 212.

The determination unit 213 of the lens control unit 109 determines the control characteristics of the correction lens 113 based on the state of the switch notified from the camera control unit 102. In the present embodiment, the determination unit 213 determines the SW1 characteristic as the control according to the first control and the control according to the third control, and determines the SW2 characteristic as the control according to the second control. In the SW1 characteristic, all the image blur correction angles according to the angular velocity detected from the gyro sensor 110 are corrected by moving the correction lens 113. Further, the SW1 characteristic is more preferably a control characteristic that does not correct the low frequency component of the image blur than the SW2 characteristic. This makes it possible to prevent the framing change during aiming.

As shown in FIG. 3, the lens control unit 109 corrects image blur according to the SW1 characteristic before the first imaging in continuous shooting starts (before the continuous shooting starts). Then, during continuous shooting from the start of the first imaging to the end of the final imaging of the continuous shooting (until the continuous shooting ends), the control according to the second control is based on the SW2 characteristic. Perform image blur correction. At the timing, image blur correction is performed based on a predetermined correction ratio. After that, the correction lens 113 is moved for image blur correction by the SW1 characteristic until the next continuous shooting starts.

The camera control unit 102 holds the image sensor 104 at the center position of the movable range as a control according to the first control before the first imaging in the continuous shooting starts (before the continuous shooting starts). During continuous shooting from the start of continuous shooting to the end of the final imaging of continuous shooting (until the end of continuous shooting), the image is imaged according to the SW2 characteristics as the control according to the second control. Perform blur correction. That is, image blur correction is performed based on a predetermined correction ratio. After that, the camera control unit 102 centers the image sensor 104 as a control according to the third control. After the centering is completed, the image sensor 104 is controlled to be held at the center position of the movable range.

Next, the control method for image blur correction in the camera system 10 will be described with reference to the flowchart shown in FIG. The camera control unit 102 reads the program shown in this flowchart from the storage unit 116 and executes the camera-side processing shown in the flowchart. The lens control unit 109 reads the program shown in this flowchart from the storage unit 117 and executes the lens-side processing shown in the flowchart.

The start timing of the flow chart is such that the lens device 101 is attached to the camera body 100, the power of the camera body 100 is turned on, the power is supplied to the lens device 101, and the camera control unit 102 and the lens control unit 109 can communicate with each other. After that.

In S301, the camera control unit 102 notifies the lens control unit 109 of the internal information of the camera body 100. Here, the internal information includes the amount of movable stroke of the image sensor 104. The size of the image sensor 104 and the like may be included.

In S302, the determination unit 213 of the lens control unit 109 determines the correction ratio at the time of SW2 characteristics based on the information received in S301. When the correction ratio of the image sensor 104 and the correction lens 113 is a: b, the correction ratio of the correction lens 113 at the time of SW2 characteristics is a / (a + b), and the correction ratio of the image sensor 104 is b / (a + b). .. In the first control, the correction ratio of the image sensor 104 and the correction lens 113 is 0: 1. Therefore, the correction ratio of the image sensor 104 is larger in the second control than in the first control, and the correction ratio of the correction lens 113. Is smaller in the second control than in the first control.

In S303, the lens control unit 109 notifies the camera control unit 102 of the determined correction ratio. In S304, the camera control unit 102 receives the notified correction ratio. The received correction ratio is transmitted to the drive control unit 207 of the camera control unit 102.

In S305 and S306, the camera system 10 performs the first control. That is, in S305, the camera control unit 102 holds (stops) the image sensor 104 at the control center position. Further, in S306, the lens control unit 109 starts image blur correction control using the correction lens 113 with the SW1 characteristic.

In S307, the camera control unit 102 determines whether or not the switch SW1 is turned on by the user's operation. If it is determined to be No, S307 is repeated. If it is determined to be Yes, the process proceeds to S308, and the lens control unit 109 is notified that the switch SW1 is ON.

In S309, the camera control unit 102 determines whether or not the switch SW2-1 is turned on. If it is determined to be No, S309 is repeated. If it is determined to be Yes, the process proceeds to S310, and the lens control unit 109 is notified that the switch SW2-1 is ON.

The lens control unit 109 receives an ON notification of the switch SW1 and the switch SW2-1 prior to the notification of the switch SW2-2, but the image blur correction by the correction lens 113 is controlled by the SW1 characteristic without any particular change. continue.

In S311 the camera control unit 102 determines whether or not the switch SW2-2 is turned on. If No, S311 is repeated. If it is determined to be Yes, the process proceeds to S312, and the lens control unit 109 is notified that the switch SW2-2 is ON. When the switch SW2-2 is turned on, the first imaging after the instruction to start imaging is started.

In S313, the lens control unit 109 receives the notification that the switch SW2-2 is turned on, and the determination unit 213 switches the control characteristic from the SW1 characteristic to the SW2 characteristic. Together with S313, in S314, the determination unit 206 of the camera control unit 102 switches from the stop control of the image sensor 104 to the control based on the SW2 characteristic, and starts the image blur correction control using the image sensor 104.

In S315, the camera control unit 102 determines whether or not a predetermined time has elapsed. If it is determined as No, S315 is repeated. If it is determined to be Yes, the process proceeds to S316. When the predetermined time has elapsed, the switch SW2-1 and the switch SW2-2 are turned off.

In S316, the camera control unit 102 determines whether or not the operation unit 103, which is a release button, is continuously fully pressed. The first step of S316 after the switch SW2-1 is turned on corresponds to the judgment of whether or not continuous shooting is performed, and the second and subsequent steps of S316 correspond to whether or not there is an instruction to end continuous shooting. To do. If the camera control unit 102 determines Yes, the process proceeds to S317, and the determination unit 206 of the camera control unit 102 sets the continuous shooting flag to ON in S317. If it is determined as No, the process proceeds to S318, and the determination unit 206 of the camera control unit 102 sets the continuous shooting flag to OFF.

In S319, the camera control unit 102 notifies the lens control unit 109 of ON or OFF of the continuous shooting flag according to the determination result in S316 and OFF of the switch SW2-1 and the switch SW2-2.

In S320, the camera control unit 102, and in S321, the lens control unit 109 determines whether or not the continuous shooting flag is OFF. In the camera system 10, when the continuous shooting flag is ON, it is determined that continuous shooting is being performed, which means that continuous shooting is continued. Therefore, the camera control unit 102 and the lens control unit are used even after the first imaging. Each of the 109 continues the control according to the second control. That is, the camera control unit 102 does not center the image sensor 104 even between a plurality of times of imaging performed in continuous shooting, and continues image blur correction at a predetermined correction ratio.

Specifically, when the camera control unit 102 determines No in S320, it returns to S309 and determines whether or not the switch SW2-1 is turned on again. When the switch SW2-1 is turned on again, the second imaging in continuous shooting is started. If the lens control unit 109 determines No in S321, the lens control unit 109 repeats S320. In this way, the camera control unit 102 and the lens control unit 109 continue the image blur correction control with the SW2 characteristic until the continuous shooting flag is turned off.

When the camera control unit 102 determines Yes in S320, and when the lens control unit 109 determines Yes in S321, it means that the camera system 10 has finished shooting. In S322, the camera control unit 102 starts centering to the reference position of the image sensor 104 as control according to the third control. Then, in S323, the camera control unit 102 determines whether or not the centering of the image sensor 104 is completed. If No is determined in S323, S323 is repeated. If it is determined to be Yes in S323, the camera control unit 102 waits for the next shooting instruction. That is, it returns to S305 and waits until the switch SW1 is turned ON again.

In S324, the lens control unit 109 switches the control characteristic of the image blur correction from the SW2 characteristic to the SW1 characteristic, and starts the image blur correction control with the SW1 characteristic as the control according to the third control. Then, the lens control unit 109 waits for the next shooting instruction. The lens control unit 109 continues the image blur correction control with the SW1 characteristic until the camera control unit 102 that has advanced to S305 gives an ON notification of the switch SW2-2 transmitted in S312.

If image blur correction is performed using the image sensor 104 and the correction lens 113 before the switch SW2-2 is turned on, both the image sensor 104 and the correction lens 113 reach the end of the movable range before imaging. Image blur correction may not be possible at all during imaging. In the present embodiment, by stopping the image sensor 104 until the switch SW2-2 is turned on, it is possible to secure a stroke for image blur correction during imaging, which requires image blur correction.

Further, in continuous shooting, the time between image pickups is shorter than that in single shooting, so that the moving strokes of the image sensor 104 and the correction lens 113 are not used up during this period. Therefore, in the present embodiment, the camera control unit 102 and the lens control unit 109 perform control according to the second control during the imaging in the continuous shooting shooting as well as during the imaging, and each time one imaging is completed. The image sensor 104 is not centered. Therefore, waiting for the end of centering delays the start of the next imaging, and as a result, it is possible to prevent the continuous shooting speed in continuous shooting from decreasing. Further, when the user is taking a picture while looking through the electronic viewfinder or the like, it is possible to prevent the subject image from appearing unnaturally distorted to the user's eyes due to the centering of the image sensor 104.

[Second Embodiment]
In the camera system 10 according to the second embodiment, the image sensor 104 and the correction lens 113 perform image blur correction based on a fluctuating correction ratio during imaging (exposure). Specifically, the determination unit 213 determines different correction ratios according to the direction of the correction lens 113 with respect to the position of the correction lens 113 at the start of preparation for imaging.

A configuration for image blur correction control in the camera system 10 according to the second embodiment will be described with reference to FIG.

The basic configuration is the same as that of the first embodiment, but the first embodiment is that the determination unit 213 uses not only the internal information received from the camera control unit 102 but also the output of the position sensor 114 when determining the correction ratio. Different from the form. Further, the difference is that the correction ratio determined by the determination unit 213 changes. The drive control unit 207 calculates the amount of movement of the image sensor 104 using different correction ratios depending on the direction of movement of the image sensor 104 with respect to the center position. At this time, the drive control unit 214 calculates the amount of movement of the correction lens 113 using different correction ratios depending on the direction of the correction lens 113 with respect to the position of the correction lens 113 at the start of preparation for imaging.

FIG. 6 is a timing chart of the image blur correction control according to the second embodiment. The horizontal direction represents the time axis, and shows the control contents of the image sensor 104 and the correction lens 113 in the continuous shooting of three times while the operation unit 103 is fully pressed.

Since the control of the camera control unit 102 is the same as that of the first embodiment, detailed description thereof will be omitted.

The lens control unit 109 controls the image blur correction using the correction lens 113 with the SW1 characteristic until the switch SW2-1 is turned on, and then the switch SW2-2 is turned on after the switch SW2-1 is turned on. Until this happens, the movement of the correction lens 113 is stopped. Then, between the time when the switch SW2-1 is turned on and the time when the switch SW2-2 is turned on, the determination unit 213 is based on the position of the correction lens 113 at the start of imaging preparation output from the position sensor 114. , The correction ratio for each direction of the correction lens 113 with respect to the position is determined. In FIG. 6, the timing at which the switch SW2-1 is turned on is the start of imaging preparation.

The determination unit 213 determines the correction ratio as follows, for example.

The correction angle corresponding to the movable stroke range of the correction lens 113 is 2 × θ2, and when the position of the correction lens 113 is Δd away from the center of the optical axis at the start of preparation for imaging, the correction angle corresponding to Δd is Δθd. At this time, the correctable angle in the first direction of the correction lens 113 in the axial direction at the start of preparation for imaging is θ2-Δθd, and the correctable angle in the direction opposite to the first direction is θ2 + Δθd. Further, the correction angle corresponding to the movable stroke range of the image sensor 104 is set to 2 × θ1.

The correction ratio between the image sensor 104 and the correction lens 113 when the correction lens 113 is in the + Y direction from the position at the start of preparation for imaging is θ1: (θ2-Δθd).

The correction ratio between the image pickup device 104 and the correction lens 113 when the correction lens 113 is in the −Y direction from the position at the start of preparation for imaging is θ1: (θ2 + Δθd).

Therefore, the correction ratios of the image sensor 104 and the correction lens 113 are as follows.
(I) Correction lens 113 (+ Y direction): (θ2-Δθd) / (θ1 + (θ2-Δθd))
(Ii) Correction lens 113 (−Y direction): (θ2 + Δθd) / (θ1 + (θ2 + Δθd))
(Iii) Image sensor 104 (+ Y direction): θ1 / (θ1 + (θ2-Δθd))
(Iv) Image sensor 104 (−Y direction): θ1 / (θ1 + (θ2 + Δθd))

By setting the correction ratio as described above, it is possible to make the image sensor 104 and the correction lens 113 reach the end of the movable stroke at the same time during image blur correction. Since the image sensor 104 and the correction lens 113 have different image blur correction amounts per unit movement amount [mm], it is possible to prevent one of them from reaching the end of the movable stroke first and the image blur correction effect from suddenly changing. be able to.

Similar to the first embodiment, image blur correction is performed by moving the image sensor 104 and the correction lens 113 with the SW2 characteristic between the plurality of imagings of continuous shooting and the plurality of imagings. Thereby, the same effect as that of the first embodiment can be obtained.

Next, the control method for image blur correction in the camera system 10 will be described with reference to the flowchart shown in FIG. The camera control unit 102 reads the program shown in this flowchart from the storage unit 116 and executes the camera-side processing of the flowchart. The lens control unit 109 reads the program shown in this flowchart from the storage unit 117 and executes the lens-side processing of the flowchart.

Since the start timing of the flowchart is the same as that of the first embodiment, the description thereof will be omitted.

In S501, the camera control unit 102 notifies the lens control unit 109 of the internal information of the camera body 100. Here, the internal information includes the amount of movable stroke of the image sensor 104. The size of the image sensor 104 and the like may be included.

S502 to S507 are the same as those of S305 to S310 described above.

In S508, the lens control unit 109 receives the notification that the switch SW2-1 is ON, stops the movement of the correction lens 113, and holds the correction lens 113 at the position at that time.

In S509, the camera control unit 102, and in S510, the lens control unit 109 determines whether or not the continuous shooting flag is OFF. If no imaging has been performed after the shooting instruction is given, the continuous shooting flag is OFF. Therefore, the camera control unit 102 determines Yes in S509, and the lens control unit 109 determines Yes in S510. In S511, the lens control unit 109 sets the correction ratio in the continuous shooting this time based on the position of the correction lens 113 held in S508, the movable stroke of the image sensor 104 received in S501, and the movable stroke of the correction lens 113. decide. The method for determining the correction ratio is as described above. Then, in S512, the lens control unit 109 notifies the camera control unit 102 of the determined correction ratio, and in S513, the camera control unit 102 receives the correction ratio.

If the camera control unit 102 determines No in S509, the process proceeds to S514 because it is not necessary to receive the correction ratio again. Similarly, when the lens control unit 109 determines No in S510, it is not necessary to receive the correction ratio again, so the process proceeds to S514.

Since S514 to S527 are the same as S311 to S324 of the first embodiment, detailed description thereof will be omitted. Then, when the camera control unit 102 determines Yes in S526, the camera control unit 102 waits for the next shooting instruction. That is, it returns to S504 and waits until the switch SW1 is turned ON again. In S527, the lens control unit 109 switches the control characteristic of image blur correction from the SW2 characteristic to the SW1 characteristic, and waits for the next shooting instruction. That is, the lens control unit 109 continues the image blur correction control with the SW1 characteristic until the ON notification of the switch SW2-1 transmitted in S505 is sent from the camera control unit 102 that has advanced to S504.

Also in this embodiment, as in the first embodiment, it is possible to secure a moving stroke for image blur correction during imaging, and it is possible to suppress a decrease in continuous shooting speed as compared with the case where centering is performed. Further, even when the user takes continuous shooting while looking through the electronic viewfinder of the camera body 100, it is possible to provide a natural appearance of the subject between frames.

If the first control is performed between a plurality of imagings of continuous shooting, it becomes necessary to reset the correction ratio and notify the correction ratio for each of the plurality of imagings in the continuous shooting. In the present embodiment, the correction ratio is set by receiving a shooting instruction for continuous shooting by continuing the second control not only during the plurality of imaging in continuous shooting but also between the multiple shootings. It can be done only before the first imaging after that. As a result, it is possible to prevent a decrease in the continuous shooting speed due to the calculation time of the correction ratio and the communication time associated with the notification of the correction ratio.

[Other Embodiments]
Next, other embodiments that can be implemented by modifying a part of the above-described embodiments will be described.

When the center position of the image circle of the photographing optical system 113a and the center position of the movable stroke on the XY plane are deviated from each other, the image sensor 104 images with reference to the position overlapping the optical axis position in the optical axis direction. It is preferable to perform blur correction control. Then, it is preferable that the holding position of the image sensor 104 in the first control and the target position in centering are set to positions that coincide with the optical axis position in the optical axis direction. As a result, image blur correction can be performed by the image sensor 104 within the range of the image circle, and it is possible to prevent a decrease in the amount of light at the end of the captured image.

Further, when the control center position is shifted according to the optical axis position of the photographing optical system in this way, it is preferable that the determination unit 213 calculates the correction ratio in consideration of the shift amount. For example, θ1 may be changed to θ1 + Δθd'and θ1-Δθd'. As a result, the movable stroke of the image sensor 104 can be effectively utilized even during image blur correction with the SW2 characteristic.

The control of the correction lens 113 by the SW1 characteristic may be started not at the timing when the internal information of the camera body 100 is notified but at the time when the notification of SW1 is received.

The correction means for correcting the image blur before the switch SW2-1 is turned on may be one of the image sensor 104 and the correction lens 113. Therefore, image blur correction may be performed using only the image sensor 104 instead of the correction lens 113 before the switch SW2-1 is turned on. At this time, when the correction ratio is determined based on the position of the correction lens 113 at the start of continuous shooting as in the second embodiment, the determination of the correction ratio is made among the camera control unit 102 and the lens control unit 109. , It is preferable to perform this in the control unit of an optical device having a correction means for moving the switch SW2-1 before it is turned on. Since the position information of the correction means to be moved before the switch SW2-1 is turned on can be acquired without communication, the time until the correction ratio is determined can be shortened.

Alternatively, in image blur correction before the switch SW2-1 is turned on, the range of the movable stroke is temporarily limited instead of stopping the correction means of one of the correction lens 113 and the image sensor 104, and the switch SW2-1 is used. The restriction may be lifted when is turned ON. At this time, the ratio of the correction by the one correction means to the whole image blur before the start of the continuous shooting shooting is the first correction ratio, and the correction ratio to the whole image blur by the one correction means during the continuous shooting shooting. When the second correction ratio is used, the maximum value of the second correction ratio is larger than the maximum value of the first correction ratio. As a result, it is possible to prevent the correction means having a limited stroke from reaching the end of the movable stroke before continuous shooting, and to secure a correction stroke during or between imaging in continuous shooting.

The correction ratio may be changed according to the focal length of the photographing optical system 113a and other image blur correction components.

Although the case where the camera control unit 102 and the lens control unit 109 perform image blur correction based on the outputs from different gyro sensors has been described, the gyro sensor used for image blur correction is not limited to this. For example, if the detection result by the gyro sensor can be shared between the camera body 100 and the lens device 101 by communication, one gyro sensor may be mounted on the camera system 10.

If the camera control unit 102 can detect the switch SW1, the switch SW2, and the signal of whether or not continuous shooting is continued, the operation unit 103 does not have to be the release button. For example, the button for the switch SW1 and the button for the switch SW2 may be separate.

Although the camera system 10 in which the lens device 101 can be attached to and detached from the camera body 100 has been described as an example, the scope of application of the present invention is not limited to this. The camera system 10 of the present invention also includes a camera in which the camera body 100 and the lens device 101 are integrally configured, and image blur correction is performed by the same processing as in each of the above-described embodiments.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and modifications can be made within the scope of the gist thereof.

10 Camera system 100 Camera body 101 Lens device 102 Camera control unit (control means)
104 Image sensor (correction means)
113 Correction lens (correction means)
109 Lens control unit

Claims (30)

For image blur correction in the predetermined axis direction,
A first control for moving one of the first correction means of the camera and the second correction means of the lens device detachable to the camera and stopping the other, or the first correction means. And a camera used in a camera system that performs a second control for moving the second correction means.
It has a control means for controlling the position of the first correction means.
The control means controls according to the first control before the continuous shooting in which a plurality of recording images are taken with one shooting instruction, and in response to the second control during the continuous shooting. A camera characterized by performing control. It has a means to judge whether it is continuous shooting or not,
When the control means determines that the determination means is continuous shooting, the control means continues the control according to the second control even after the first imaging after the shooting instruction is given, and the determination means continues. When it is determined that the camera is not a photograph, the claim is characterized in that after the first imaging, the second control is switched to a control according to a third control different from the first and second controls. Item 1. The camera according to item 1. The camera according to claim 2, wherein when it is determined that the determination means is continuous shooting, the control means performs control according to the third control after the continuous shooting is completed. The control means is characterized in that, when the first correction means is stopped as a control according to the first control, the first correction means is centered as a control according to the third control. The camera according to claim 2 or 3. The camera according to claim 4, wherein the target position at the time of centering is a position that overlaps with the center of the image circle of the lens device in the optical axis direction. When the control means moves the first correction means as a control according to the first control, the control means moves the first correction means as a control according to the third control to correct image blur. The camera according to claim 2 or 3, wherein the camera is used. It has an operating member used to instruct continuous shooting.
The camera according to any one of claims 1 to 6, wherein the determination means determines whether or not continuous shooting is performed based on an operation on the operation member. The camera according to any one of claims 1 to 7, wherein the second control is a control that does not involve centering of the first correction means. The control means responds to the second control based on the information regarding the correction ratio between the first correction means and the second correction means, which is determined by the determination means included in the camera or the lens device. The camera according to any one of claims 1 to 8, wherein the camera is controlled. Having the determination means
When the control means moves the first correction means as a control according to the first control, the determination means is based on the position at the start of the second control of the first correction means. The camera according to claim 9, wherein the information is determined. The camera according to claim 10, wherein the determination means determines different information for each direction with respect to the position at the start of the second control of the first correction means. The determining means includes a correctable amount of the first means on the first direction side with respect to the first position which is a position at the start of the second control of the first correction means, and the correctionable amount with respect to the first position. The correctable amount of the first means on the second direction side opposite to the first direction and the third direction with respect to the second position which is the position at the start of the second control of the second correction means. The information is determined based on the correctable amount of the first means on the side and the correctable amount of the second means on the fourth direction side opposite to the third direction with respect to the second position. 11. The camera according to claim 11. At least one of claims 1 to 12, wherein the control according to the first control is performed between the time when the start instruction of the shooting preparation operation is given and the time when the continuous shooting shooting is started. Described camera. A first method of moving and stopping one of a first correction means of a camera and a second correction means of a lens device that can be attached to and detached from the camera for image blur correction in a predetermined axial direction. A lens device used in a camera system that controls the above, or a second control for moving the first correction means and the second correction means.
It has a control means for controlling the position of the second correction means.
The control means performs control according to the first control before continuous shooting in which imaging for recording is performed a plurality of times with one shooting instruction, and responds to the second control during the continuous shooting. A lens device characterized by performing various controls. It has a receiving means for receiving information indicating whether or not continuous shooting is performed from the camera.
When the control means receives information indicating continuous shooting from the receiving means, the control means continues the control according to the second control even after the first imaging after the shooting instruction is given. When information indicating that the continuous shooting is not performed is received from the receiving means, the control according to the third control different from the first and second controls from the second control after the first imaging. The lens device according to claim 14, wherein the lens device is switched to. When information indicating continuous shooting is received from the receiving means,
The lens device according to claim 15, wherein the control means performs control according to the third control after the end of the continuous shooting. The control means
15. The first aspect of the invention is characterized in that, when the first correction means is stopped as the control according to the first control, the first correction means is centered as the control according to the third control. 16. The lens apparatus according to 16. The lens device according to claim 17, wherein the target position at the time of centering is a position that overlaps with the center of the image pickup element of the camera in the optical axis direction. When the control means moves the first correction means as a control according to the first control, the control means moves the first correction means as a control according to the third control to correct image blur. The lens apparatus according to claim 14 or 15. The lens device according to any one of claims 14 to 19, wherein the second control is a control that does not involve centering of the first correction means. The control means is based on information regarding a correction ratio between the first correction means and the second correction means, which is determined by the determination means of the camera or the lens device in the second control. The lens device according to any one of claims 14 to 20, wherein control is performed according to a second control. Having the determination means
When the control means moves the first correction means as a control according to the first control, the determination means is based on the position of the first correction means at the start of the second control. 21. The lens apparatus according to claim 21, wherein the information is determined. 22. The lens device according to claim 22, wherein the determination means determines different information for each direction with respect to a position of the first correction means at the start of the second control. The determining means is a correctable amount of the first means on the first direction side with respect to the first position which is a position at the start of the second control of the first correction means, and the correction means with respect to the first position. The correctable amount of the first means on the second direction side opposite to the first direction and the third direction with respect to the second position which is the position at the start of the second control of the second correction means. The information is determined based on the correctable amount of the first means on the side and the correctable amount of the second means on the fourth direction side opposite to the third direction with respect to the second position. 23. The lens device according to claim 23. At least one of claims 14 to 24, wherein the control according to the first control is performed between the time when the start instruction of the shooting preparation operation is given and the time when the continuous shooting shooting is started. The lens device described. The camera has a camera and a lens device, the camera has a movable first correction means for image blur correction, and the lens device has a movable second correction means for image blur correction. It ’s a camera system,
To correct image blur in a predetermined axis direction, one of the first correction means and the second correction means is moved before continuous shooting in which multiple recording images are taken with one shooting instruction. A camera system characterized in that a first control for causing and stopping the other is performed, and a second control for moving the first correction means and the second correction means during continuous shooting shooting is performed. A first method of moving and stopping one of a first correction means of a camera and a second correction means of a lens device that can be attached to and detached from the camera for image blur correction in a predetermined axial direction. A control method for a camera that controls the first correction means and the second correction means for moving the second correction means.
A process of performing control according to the first control before continuous shooting in which imaging for recording is performed a plurality of times with one shooting instruction, and
A control method comprising a step of performing control according to the second control during the continuous shooting. A first method of moving and stopping one of a first correction means of a camera and a second correction means of a lens device that can be attached to and detached from the camera for image blur correction in a predetermined axial direction. This is a control method for a lens device that controls the first correction means and the second correction means for moving the second correction means.
A process of performing control according to the first control before continuous shooting in which imaging for recording is performed a plurality of times with one shooting instruction, and
A control method comprising a step of performing control according to the second control during the continuous shooting. A camera with a removable lens device
A movable first correction means for image blur correction,
It has a control means for controlling the position of the first correction means.
The control means corrects image blur by moving the first correction means during the continuous shooting before the continuous shooting in which the imaging for recording is performed a plurality of times with one shooting instruction.
The ratio of the correction by the first correction means to the total image blur before the continuous shooting is the first correction ratio, and the ratio of the correction by the first correction means to the total image blur during the continuous shooting. Is a second correction ratio, and the maximum value of the second correction ratio is larger than the maximum value of the first correction ratio. It is a lens device that can be attached to and detached from the camera.
A second movable correction means for image blur correction,
It has a control means for controlling the position of the second correction means.
The control means corrects image blur by moving the second correction means during the continuous shooting before the continuous shooting in which the imaging for recording is performed a plurality of times with one shooting instruction.
The ratio of the correction by the second correction means to the total image blur before the continuous shooting is the third correction ratio, and the ratio of the correction by the second correction means to the total image blur during the continuous shooting. Is a fourth correction ratio, the lens device is characterized in that the maximum value of the fourth correction ratio is larger than the maximum value of the third correction ratio.

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