JP6160987B2 - Camera system, camera body, interchangeable lens and camera shake correction unit - Google Patents

Description

The present invention shifts the imaging position on the image plane by moving a part of the lens or the lens group of the entire lens system in a still camera or a video camera in a plane perpendicular to the optical axis of the entire lens system, The present invention relates to an optical camera shake correction technique for correcting a displacement of an imaging position due to a camera shake of a photographer, and more particularly to an optical camera shake correction technique employed in a camera system in which a lens can be replaced.

Conventionally, camera shake correction technology has been developed to prevent blurry images from being shot due to camera shake during shooting by the photographer, and many imaging devices equipped with camera shake correction technology have become widespread. ing.

Camera shake caused by the photographer usually occurs unless the camera is fixed to a tripod or the like. In particular, in the case of a still camera, when shooting at a high shutter speed, camera shake or the like may occur. Although the influence is small, when shooting at a low shutter speed, the influence of camera shake or the like on the shot image becomes significant.

For example, in an environment with a small amount of light where it is difficult to obtain a sufficient exposure amount for photographing at a high shutter speed, there is a situation where an image with proper exposure cannot be taken unless the photograph is taken at a low shutter speed.

When shooting at a low shutter speed, the exposure time becomes long, so if camera shake occurs during shooting, the imaging position changes immediately after shooting starts and immediately before shooting ends. As a result, a blurred image is easily captured. That is, there is a high possibility that a failed photo that is affected by camera shake or the like is taken.

On the other hand, several types of camera shake correction techniques have already been invented in order to reduce the influence of a camera shake or the like on a captured image.

As a main type of camera shake correction technology, a part of the lens or lens group in the lens optical system is moved in a plane perpendicular to the optical axis to shift the imaging position and correct the displacement of the imaging position. There are an optical camera shake correction technique and an image sensor shift type camera shake correction technique in which the imaging plane is shifted by moving the imaging device in a plane perpendicular to the optical axis to correct the displacement of the imaging position.

In the optical image stabilization technology, the shutter release button half-press of the camera is used as a cue to start control so that the amount of blur is detected and the detected blur amount is canceled for some lenses or lens groups in the lens optical system. Shift in a plane perpendicular to the optical axis.
The displacement of the imaging position caused by the camera shake of the photographer is canceled by shifting the imaging position on the image plane by some lenses or lens groups of the shifted lens optical system. Therefore, if shooting is performed while the camera shake correction control is functioning, it is possible to capture an image in which the influence of camera shake by a photographer or the like is canceled.

In the image sensor shift type camera shake correction technology, when the release button of the camera is fully pressed as a signal to start control, the image sensor is shifted in a plane perpendicular to the optical axis so as to detect the blur amount and cancel the detected blur amount. Let
The displacement of the imaging position that has occurred due to camera shake of the photographer is canceled by shifting the imaging element so as to follow the image with respect to the lens optical system. That is, by shifting the image sensor at the time of photographing, it is possible to photograph an image in which the influence due to camera shake is canceled.

Optical image stabilization technology enables camera shake correction to continue shifting a part of the lens optical system in a plane perpendicular to the optical axis for a while after the photographer presses the release button halfway. The function works regardless of whether or not shooting is performed. Accordingly, there is an advantage that the photographer can observe the subject whose shake is corrected through the viewfinder or the live view.
That is, the photographer can determine the composition of the shooting in the state in which the influence due to the camera shake is canceled in the optical camera shake correction technique.

On the other hand, the image sensor shift type camera shake correction technology is advantageous in terms of cost as a whole camera system, since it is not necessary to mount a camera shake correction mechanism for each interchangeable lens, particularly in an interchangeable lens camera system with interchangeable lenses. .

Although there are not many camera shake correction techniques when classified by focusing on the fundamental system as described above, many peripheral techniques have been invented to solve various problems surrounding camera shake correction techniques. .

Patent Document 1 (Japanese Patent No. 3192414) describes fixing means for a correction optical system as a peripheral technique of the optical camera shake correction technique.

Patent Document 1 points out a problem of an optical camera shake correction mechanism in which the correction optical system moves freely when not controlled, and presents a solution.

In optical camera shake correction technology, when control over the movable member including the correction optical system is lost, that is, when power is not supplied to the optical camera shake correction mechanism, the correction optical system is caused by gravity or inertia in the lens barrel. It moves freely. For this reason, when the lens barrel is vibrated when it is carried, the correction optical system repeatedly collides with the wall surface of the movable end, which may damage the wall surface of the movable end.

In order to solve this problem, in the invention described in Patent Document 1, in response to the power-off of the camera body, the correction optical system is located at the movable center position so that the optical axis of the correction optical system coincides with the optical axis of the optical system. A fixing means for fixing the image is added to the image blur prevention device.
As a result, the correction optical system is physically fixed at a movable center position that coincides with the optical axis of the optical system in the lens barrel even when there is no power supply to the interchangeable lens. There is no possibility that the movable member including the correction optical system will damage the wall surface of the movable end.

Japanese Patent No. 3192414

However, the image blur prevention device described in Patent Document 1 has an effect of preventing the movable member including the correction optical system from damaging the movable end during carrying, but the camera system is restored from the power-off state. Since the operation of releasing the fixing means is necessary at the time of sleep release, a time lag occurs in the time from the sleep release to the start of photographing as compared with the image blur prevention device without the fixing means.

Further, in the conventional general image blur prevention device having the fixing means, since the fixing means is controlled to be released every time the release is half-pressed, in the photographing situation where the release half-press is repeatedly performed at a certain interval, the fixing means The release / fixing control is repeated, and in this case, in particular, the influence of the time lag in the time from when the fixing means is released until the photographing becomes possible is great.

Furthermore, including the image blur prevention device described in Patent Document 1, the optical image stabilization mechanism needs to perform center holding control for a certain period of time after sleep release regardless of the presence or absence of fixing means, and this can also be taken. It will cause the time to become longer.

In the center holding control after sleep release, in the optical camera shake correction mechanism having a fixing means, the correction optical system falls in the direction of gravity when the fixing means is released, and the photographer feels uncomfortable every time the release is half-pressed. This is necessary to prevent an image from being observed through the viewfinder.

Further, even after the center holding control is started, it is necessary to wait for a certain period of time until the camera shake correction effect is stabilized, and this time also increases the time until the photographing becomes possible.
If shooting is performed while ignoring this standby time, shooting is performed while the signal from the gyro sensor for detecting blur is not stable, and it is not expected to take a photo with a sufficient camera shake correction effect.

As described above, a certain amount of time lag is required from the halfway release to the start of shooting in order to take a picture with sufficient camera shake correction effect for the release control of the fixing means and the center holding control.
If this time lag is ignored and shooting is possible immediately after half-pressing the release, it is not possible to take a photo with a sufficient camera shake correction effect, particularly when the photographer attempts to take a picture by pressing the release button all at once.

For example, if it is possible to take a picture without the completion of the release of the fixing means, the picture is taken with the correction optical system held at the center, and a blurry photograph with no blur correction effect is taken. .
Even if the release of the fixing means is completed, if the camera does not wait for a certain period of time from the start of the center holding control and the camera shake is not stabilized, the camera shake correction effect is not sufficiently exhibited. A certain failure photo is taken.

By the way, the provision of a fixing means in the optical camera shake correction mechanism is a peripheral technology of the optical camera shake correction mechanism, and there is also an optical camera shake correction mechanism that does not have a fixing means.
The purpose of the fixing means is to solve the problem pointed out by Patent Document 1, but it is possible to prevent the movable end from being damaged without the fixing means.

The movable member including the correction optical system of the optical camera shake correction mechanism is lighter than the movable member including the image sensor of the image sensor shift type camera shake correction mechanism. In addition, since the optical camera shake correction mechanism is usually designed for each lens optical system, the limit range of the movable end can be optimally designed for each lens optical system.

Therefore, by taking measures such as designing the wall surface of the movable end using a material that satisfies the durability and optimally designing the limit range of the movable end without being too large, in the optical image stabilization mechanism Can prevent the movable end from being damaged without providing a fixing means.

That is, in the optical camera shake correction mechanism, by eliminating the fixing means, not only the mechanism of the fixing means itself, but also a drive means for controlling the fixing means and a space for installing the fixing means are omitted. Is possible.
Further, by eliminating the fixing means, it is possible to save power for releasing and fixing the fixing means each time the release is half-pressed, and it is possible to reduce time loss for controlling the fixing means.

Although it is possible to reduce the time lag for controlling the fixing means in the optical image stabilization mechanism that does not have the fixing means, the release half-press is still the same as in the optical image stabilization mechanism having the fixing means. A time lag remains for a certain period of time from when the camera can shoot.

As a cause of this time lag, there is a center holding control after a half release of the release which is necessary even in an optical camera shake correction mechanism having no fixing means.

The center holding control in the camera shake correction mechanism having no fixing means is more important than the center holding control in the camera shake correcting mechanism having the fixing means.

Since the movable member including the correction optical system in the camera shake correction mechanism having no fixing means is not fixed by the fixing means or the like at the time of non-control, it is positioned in the gravity direction of the lens barrel at the movable end until immediately after the release half-press. Touching the wall.

Therefore, when attempting to perform camera shake correction control on a movable member that includes a correction optical system in contact with the wall surface of the movable end, the movable member is driven further outward than the movable end, and the behavior at the start of camera shake correction is reached. May become unstable.
Further, since the camera shake correction is started in an unstable state, there is a possibility that useless power unrelated to the camera shake correction may be consumed.

On the other hand, the above problem can be solved by once separating the movable member from the movable end by the center holding control after the release half-press and before starting the camera shake correction control.
As a result, even in an optical camera shake correction mechanism that does not have a fixing unit, a time lag is generated by performing center holding control once at the start of camera shake correction control.

After the center holding control is executed and the camera shake correction control is started, the state of the movable member becomes the same regardless of the presence or absence of the fixing means. Even in the optical camera shake correction mechanism having no fixing means, the fixing means is not used. As in the case of the optical camera shake correction mechanism, a standby time for stabilizing the camera shake correction effect is required.

For the above reasons, in order to take a photograph with a camera shake correction effect, even in an optical camera shake correction mechanism having no fixing means, as in the case of the optical camera shake correction mechanism having a fixing means, the release half-press The time lag from the start to shooting still remains.

Also, if this time lag is ignored and shooting is possible immediately after pressing the release halfway, especially when the photographer tries to shoot by pressing the release button at once, it is even more manual than the optical image stabilization mechanism that has a fixing means. There is a high possibility that a picture with insufficient blur correction effect will be taken.

In an optical image stabilization unit that does not have a fixing means, the movable member including the correction optical system is in contact with the movable end in the gravitational direction in the lens barrel immediately after half-pressing the release. If a picture is taken before the holding control is completed, a failure photograph in which the optical axis of the correction optical system is greatly displaced in the direction of gravity may be taken in addition to the influence of camera shake. In addition, as with the camera shake correction mechanism that does not have a fixing means, if shooting is performed in a state where the camera shake correction effect is not stable, a failed photo that does not exhibit the camera shake correction effect sufficiently will be shot. .

Further, the center holding control plays an important role even after the photographing is completed.

Immediately after the end of shooting, if the camera shake correction control is immediately stopped and left as it is, in the optical camera shake correction mechanism having no fixing means, the movable member including the correction optical system is not driven and controlled at all. It falls freely in the direction of gravity in the lens barrel. This causes the photographer to observe an unpleasant image through the viewfinder or the like immediately after the photographing is finished.

Therefore, it is desirable to maintain the center holding control for a predetermined time, assuming that the photographer is still confirming the video with the viewfinder immediately after the photographing is finished.

However, conventionally, since the center holding control after the shooting is dependent on the end signal of the camera shake correction operation, once the center holding control is started, the camera body is not used except when the camera system sleeps. It was difficult to end the center holding control at an arbitrary time to be determined.

By controlling the center holding control so that it can be executed in an arbitrary period without depending on other operations such as the camera shake correction operation, for example, in the optical camera shake correction mechanism having no fixing means, There are benefits.

For example, when the camera body is mounted on a tripod, or when the camera body is remote control shooting that is not supported by the photographer, there is a shooting setting that clearly does not require camera shake correction control. In addition, there are shooting conditions in which the amount of light is sufficient, the shutter speed is sufficiently high, and obviously no camera shake correction operation is necessary.

In these cases, if the camera shake correction control is operated, a useless camera shake correction effect is provided, and there is a possibility that a captured image is adversely affected.

However, even if the camera shake correction operation is obviously unnecessary, in the optical camera shake correction mechanism that does not have a fixing means, there is no fixing means. Center holding control for maintaining and controlling the movable member including the correction optical system so as to coincide with the axis is essential.

Therefore, especially in the optical camera shake correction mechanism, it is necessary to perform only the center holding control independently without performing the camera shake correction control at a predetermined shooting setting and shooting conditions that obviously do not require the camera shake correction operation. There is.
In addition, it is desirable that the commands for starting and ending the center holding control be performed by the camera body that can grasp the shooting settings and shooting conditions.

The present invention adopts an optical camera shake correction mechanism, and can shorten the time lag from the half-press of the release until the camera shake correction effect can be stably taken. The camera system, the camera body constituting the camera system, and the exchange An object is to provide a lens and a camera shake correction unit.

It is another object of the present invention to provide a camera system, a camera body, an interchangeable lens, and a camera shake correction unit that can execute center holding control independent of camera shake correction operation.

In order to solve the above problems, the camera system of the present invention can be mounted with an interchangeable lens on the camera body. In the camera system that performs communication between the camera body and the interchangeable lens, the camera body includes: A correction start signal for instructing the start of camera shake correction control is transmitted to the interchangeable lens, and a correction end signal for instructing the end of camera shake correction control is transmitted. The interchangeable lens is a part of the lens optical system. A lens or a lens group is used as a correction optical system, and the camera system detects the blur amount of the camera system and the current position of the correction optical system, and the correction optical system is in contact with the wall in the direction of gravity without energization. The driving means for moving the movable member including the correction optical system in a plane perpendicular to the optical axis with respect to the fixed member is a magnet installed on the movable member side or the fixed member side. And the movable member is driven by electromagnetic force generated when current is supplied to the coil, and the correction optical system is calculated from the amount of blurring. An optical camera shake correction mechanism that performs camera shake correction control by moving the correction optical system in a plane perpendicular to the optical axis so as to cancel the difference between the target position of the correction optical system and the current position of the correction optical system. And the camera body transmits a center holding start signal to the interchangeable lens after the power supply of the camera body is operated and before the camera body transmits the correction start signal to the interchangeable lens. After the correction end signal is transmitted to the interchangeable lens, the center retention end signal is transmitted to the interchangeable lens, and the interchangeable lens receives the center retention start signal from the camera body. And after the start the center support control and before the release half-press operation as a correction optical system of the optical axis and the lens optical system of the optical axes coincide with the center support end signal received from said camera body Then, the center holding control is terminated.

The interchangeable lens of the present invention constitutes a camera system, and a part of the lens optical system or a lens group is a correction optical system, and the correction optical system is in contact with a wall surface in the direction of gravity without energization. The driving means for moving the movable member including the correction optical system in a plane perpendicular to the optical axis with respect to the fixed member is disposed on the movable member side or on the opposite side of the magnet disposed on the fixed member side. The movable member is an interchangeable lens driven by electromagnetic force generated when current is supplied to the coil, and receives a center holding start signal from a camera body operated with a power supply after the correction optical system and the optical axis and the optical axis of the lens optical system starts center support control to match before the release half-press operation, further, a correction start signal from said camera body If the signal is received, the camera shake correction control is started, and if a correction end signal is received from the camera body, the camera shake correction control is ended, and the center is held from the camera body. The center holding control is ended after receiving the end signal.

The camera shake correction unit of the present invention is a camera shake correction unit built in an interchangeable lens constituting a camera system, wherein a part of the lens optical system or a lens group is a correction optical system, and the correction optical System, a shake amount detection means, and a correction optical system position detection means, the correction optical system is in contact with a wall surface in the direction of gravity without energization, and a movable member including the correction optical system is fixed. The driving means for moving in a plane perpendicular to the optical axis with respect to the member is composed of a magnet installed on the movable member or the fixed member side and a coil installed on the opposite side, and the movable member is the coil current is driven by the electromagnetic force generated by being supplied to the interchangeable lens, according to receive a central holding start signal from the power operated camera body, the release half-press operation In accordance with the correction optical system of the optical axis and the optical axis lens optical system of the interchangeable lens starts center support control to match up, the interchangeable lens receives the correction start signal from the camera body, The amount of camera shake detected by the photographer detected by the camera shake amount detecting means and the current position of the correction optical system detected by the correction optical system position detecting means are calculated and calculated from the amount of shake. In order to cancel the difference between the target position of the correction optical system and the current position of the correction optical system, the correction optical system is driven in a plane perpendicular to the optical axis by the correction optical system driving means, and the exchange The lens is characterized in that the center holding control is ended after receiving the center holding end signal from the camera body.

As described above, in the present invention, in the communication from the camera body to the interchangeable lens, the center holding start signal and the center holding end signal are provided as dedicated signals, and the start and end of the center holding control can be controlled by the camera body. The center holding control that does not depend on the shake correction operation can be executed.

In the present invention, the camera body determines the shooting settings and shooting conditions that clearly do not require the camera shake correction operation at the time of shooting, so that the camera shake to the interchangeable lens is not manually switched by the photographer. The correction operation command is stopped, and only the center holding control can be commanded.

According to the present invention, even when an optical camera shake correction mechanism that does not have a fixing means for fixing the movable member including the correction optical system to the center of the optical axis when the power is turned off is adopted, the release half-press is performed. To provide a camera system, a camera body and an interchangeable lens constituting the camera system, and a camera shake correction unit built in the interchangeable lens, capable of shortening a time lag until stable shooting is possible. Can do.

In the camera system of the present invention, the camera body can start the center holding control on the camera shake correction unit of the interchangeable lens by operating the operation system of the camera body.

Furthermore, according to the present invention, it is possible to control the center holding control independently of the camera shake correction operation. As a result, even for shooting settings and shooting conditions that do not require camera shake correction, the camera settings and shooting conditions are automatically determined without manual switching by the photographer, and camera shake correction is not performed. Only center holding control can be executed.

Further, in the present invention, a center holding end signal is provided for instructing the end time of center holding control to the interchangeable lens, and the center holding control end time can be arbitrarily set by the camera body, and the center holding control time can be arbitrarily set. Can be changed to

Further, by making it possible to arbitrarily change and set the time for center holding control, it is possible to optimize the minimum amount of power required for center holding control, particularly in a camera shake correction mechanism that does not have a fixing means.

In addition, after the camera shake correction operation , it is possible to control the center holding by setting an arbitrary time led by the camera body, and immediately after the camera shake correction operation , the movable member including the correction optical system immediately falls freely in the direction of gravity. It is possible to prevent the photographer from observing an unpleasant image from the viewfinder.

The system block diagram which concerns on the Example of the camera system of this invention Control flowchart according to an embodiment of the camera body of the present invention Control flowchart according to an embodiment of the interchangeable lens of the present invention Cross-sectional view of the mechanism according to the embodiment of the camera shake correction control unit of the present invention Control flowchart according to another embodiment of the camera body of the present invention

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

The camera system according to the embodiment of the present invention is an interchangeable lens camera system in which a lens can be interchanged with respect to the camera body. The camera shake correction mechanism system according to the embodiment of the present invention employs an optical camera shake correction mechanism.

The camera system of the present invention will be described with reference to FIG.

FIG. 1 is a system block diagram showing an entire camera system according to an embodiment of the present invention. Reference numeral 100 denotes a camera body, and 200 denotes an interchangeable lens.

The configuration of the camera body 100 will be described.

In the camera body 100, 101 indicates a battery, and 102 indicates a power supply device. Electric power is supplied from the battery 101 to the control system of the camera body 100 and the interchangeable lens 200 via the power supply device 102. Further, power is supplied from the battery 101 to the drive system of the camera body 100 and the interchangeable lens 200. Power supply from the camera body 100 to the interchangeable lens 200 is performed via a connection terminal provided on a mount described later.

Reference numeral 103 denotes an imaging apparatus. The imaging device 103 includes an image sensor, a shutter, and the like, and in the case of a single-lens reflex camera, a quick return mirror and the like are included.

Reference numeral 104 denotes a camera control unit. The camera control unit 104 receives power supply from the power supply device 102, controls various drive systems of the camera body 100, and communicates with a lens control unit described later.

The camera control unit 104 processes signals from various sensors to control various drive systems.

Reference numeral 105 denotes an AF sensor, and 106 denotes an AE sensor. The camera control unit 104 calculates a signal value obtained by the AF sensor 105, performs distance measurement, transmits the distance to the lens control unit, and causes the interchangeable lens 200 to perform an AF operation. The camera control unit 104 calculates the signal value obtained by the AE sensor 106 and performs photometry, determines the exposure amount of the imaging device 103, and causes the lens control unit to perform aperture control of the interchangeable lens 200.

Reference numeral 107 denotes an operation system of the camera body 100. A command from the operation system 107 is input to the camera control unit 104. The camera control unit 104 performs control and communication according to this. The operation system includes a power button for turning on / off the power of the camera body 100, an exposure mode dial for setting a photographing method, a release button for instructing AF operation and photographing, and other menu buttons.

Of the operation system 107, the release button has a mechanism that is pressed in two steps. The state where the release button is pressed down is the half-press of the release, and the state where the release button is pressed is the full release of the release. In addition, when the release half-press is performed, the camera body 100 instructs the interchangeable lens 200 to perform an AF operation. When the interchangeable lens 200 has a camera shake correction mechanism, the camera body 100 starts the camera shake correction operation. To instruct. Furthermore, when the release is fully pressed, the camera body 100 starts a photographing operation.

Reference numeral 108 denotes an image processing unit, 109 denotes a storage device, and 110 denotes a display device. An image signal acquired by the photographing apparatus 103 in response to an instruction from the camera control unit 104 is sent to the image processing unit 108, subjected to a series of image processing, and then stored in the storage device 109. Image information after shooting and setting information of the camera body 100 and the like are displayed on the display device 110.

The physical connection between the camera body 100 and the interchangeable lens 200 is performed via the mount 300. Further, the electrical connection between the camera body 100 and the interchangeable lens 200 is performed via a contact terminal group provided on the mount 300.

The contact terminal group of 300 on the camera body 100 side in this embodiment includes a control power supply terminal C_VDD, a clock signal terminal C_CLK, a command signal terminal C_CMD, an answer signal terminal C_ANS, a motor power supply terminal C_MP, and a ground terminal C_GND. .

Electric power is supplied from the control power supply terminal C_VDD to the lens control unit of the interchangeable lens 200, and electric power is supplied from the motor power supply terminal C_MP to various drive systems of the interchangeable lens 200.
A command signal CMD for the camera body 100 to obtain lens data for the interchangeable lens 200 is output from the command signal terminal C_CMD, and an answer signal ANS such as lens data is input to the answer signal terminal C_ANS.

Next, the configuration of the interchangeable lens 200 will be described. The interchangeable lens 200 includes a lens optical system (not shown).

In the interchangeable lens 200, 201 indicates a lens control unit. The lens control unit 201 receives power supply from the camera body 100, communicates with the camera control unit 104, and controls various drive systems in the interchangeable lens 200.
Reference numeral 202 denotes an encoder. Based on the signal value from the encoder 202, the lens control unit 201 detects the current subject distance, and further detects the current focal length when the interchangeable lens 200 is a zoom lens.

Examples of various drive systems in the interchangeable lens 200 include the following drive systems.

Reference numeral 203 denotes an aperture, and 204 denotes an aperture drive unit. The diaphragm 203 is driven by a diaphragm driving unit 204 that receives a command from the lens control unit 201. In addition, power is supplied from the camera body 200 to the aperture driving unit 204.
Reference numeral 205 denotes an AF lens group, and 206 denotes an AF driving unit. The AF lens group 205 is a part of the lens optical system, and is driven by an AF driving unit 206 that receives a command from the lens control unit 201. In addition, power from the camera body 100 is supplied to the AF driving unit 206.

Further, a camera shake correction control unit 207 for performing a camera shake correction operation as a drive system in the interchangeable lens 200 will be described.

The camera shake correction control unit 207 includes the following components.

Reference numeral 208 denotes a camera shake correction switch. Whether the camera shake correction control of the interchangeable lens 200 is permitted or not is determined by turning on or off the camera shake correction switch 208.

Reference numeral 209 denotes a camera shake correction unit in the interchangeable lens 200. The camera shake correction unit 209 includes a correction optical system 210, a VCM driving unit 211, a VCM (voice coil motor) 212 mainly composed of a magnet and a coil, an angular velocity sensor (gyro sensor) 213, and a correction optical system position detection device (Hall element). ) 214 is included.
The VCM 212 is a drive unit for the correction optical system 210, the angular velocity sensor 213 is a shake amount detection unit, and the correction optical system position detection device is a correction optical system position detection unit.

In the optical camera shake correction mechanism of the present embodiment, a part of the lenses or the lens group in the lens optical system of the interchangeable lens 200 is moved as a correction optical system 210 in a plane perpendicular to the optical axis, thereby forming an image forming position. It is possible to correct the displacement of the imaging position due to the camera shake of the photographer.
That is, the correction optical system 210 is movable in the interchangeable lens 200, and a member in the interchangeable lens 200 including the correction optical system 210 is particularly referred to as a movable member. In contrast, non-movable members are collectively referred to as fixed members.

The movable member including the correction optical system 210 is driven by the VCM driving unit 211 and the VCM 212. The VCM 212 is a driving means for driving the correction optical system 210 in a plane perpendicular to the optical axis, and is mainly installed on the movable member side or the fixed member side of the camera shake correction unit and on the opposite side thereof. Coil. Then, an electromagnetic force is generated between the coil and the magnet by the current supplied to the coil, so that the movable member on which the magnet or the coil is installed is driven, and the correction optical system 210 included in the movable member is placed on the optical axis. Moved in a vertical plane.

The angular velocity sensor 213 includes a gyro sensor or the like, detects an angular blur of the interchangeable lens 200 due to a camera shake of a photographer, and notifies the lens control unit 201 of it. The correction optical system position detection device 214 includes a Hall element or the like, detects the current position of the movable member including the correction optical system 210, and notifies the lens control unit 201 of the current position.

Then, the lens control unit 201 calculates the difference between the information on the angular blur of the interchangeable lens 200 obtained from the angular velocity sensor (gyro sensor) 213 and the information on the current position of the movable member obtained from the correction optical system position detection device 214. And the drive amount of the VCM 212 is determined so that this difference is eliminated.

FIG. 4 is a cross-sectional view showing the mechanism of the camera shake correction unit 209. The number which shows a member is the same as the number of each member already mentioned above.

4, 210 is a correction optical system, 215 is a lens frame, 216 is a magnet, 217 is a coil, 214 is a Hall element (correction optical system position detecting device), 218 is a spherical rolling element, 219 is a yoke, and correction optics. These member groups including the system 210 are assumed to be movable members.

The spherical rolling element 218 enables the movable member to move smoothly in a plane perpendicular to the optical axis with respect to the fixed member. The hall element (correction optical system position detection device) 214 converts a magnetic change from the magnet 216 into an electrical signal, and detects the current position of the movable member.

The lens control unit 201 calculates the difference between the current position information of the movable member from the Hall element (correction optical system position detection device) 214 and the angle blur information from the angular velocity sensor (gyro sensor) 213, and based on this, the coil The amount of current supplied to 217 is controlled, and the movable member is driven and controlled by the electromagnetic force generated by the relationship between the magnet 216 and the coil 217.

The mechanism of the camera shake correction unit in the present embodiment is such that when the power of the camera body 100 is off, that is, when power is not supplied to the interchangeable lens 200, the correction optical system 210 matches the optical axis with the lens optical system. A mechanism that does not have a fixing means that is physically fixed and held will be described.

Even if the fixing means is not necessarily provided, it is possible to establish a camera shake correction unit that is not likely to be destroyed if it is designed to ensure the durability of the movable end wall surface with respect to the movable member.

As an advantage of the camera shake correction unit that does not have a fixing means, it is possible to reduce the cost of the camera shake correction unit and hence the entire interchangeable lens without requiring many members required for the mechanism of the fixing means. .
Furthermore, it is not necessary to release / fix the fixing means for each AF operation, so that power consumption can be suppressed.
Furthermore, it is not necessary to install the fixing means in a narrow camera shake correction unit, and space can be saved.
Furthermore, it does not require time for the fixing means release drive to start the camera shake correction control, and from the camera shake correction unit having the fixing means until a photograph having a camera shake correction effect can be taken from halfway pressing. It is possible to shorten the time.

In FIG. 1, reference numeral 300 denotes a mount, which is a connection part for physically connecting the interchangeable lens 200 to the camera body 100 as described above. Similarly, the mount 300 is provided with a contact terminal group for electrically connecting the interchangeable lens 200 and the camera body 100.

As the contact terminal group, also in the interchangeable lens 200, the control power terminal L_VDD, the clock signal terminal L_CLK, the command signal terminal L_CMD, the answer signal terminal L_ANS corresponding to each contact terminal provided on the mount 300 of the camera body 100 described above. A motor power terminal L_MP and a ground terminal L_GND are provided.

Next, control of the camera system according to the embodiment of the present invention will be described using a flowchart.

In the present invention, in the communication from the camera body to the interchangeable lens, a center retention start signal that is a dedicated signal for the camera body to instruct the interchangeable lens to start the center retention control is newly provided. When the interchangeable lens receives the center holding start signal from the camera body, the interchangeable lens starts center holding control of the correction optical system in the camera shake correction unit.

Further, in the present invention, in the communication from the camera body to the interchangeable lens, a center retention end signal that is a dedicated signal for the camera body to instruct the interchangeable lens to terminate the center retention control is newly provided. When the interchangeable lens receives the center holding end signal from the camera body, the interchangeable lens ends the center holding control of the correction optical system in the camera shake correction unit.

Conventionally, the start and end timings of the center holding control of the correction optical system have been controlled separately from the control of the camera body by a program previously installed in the interchangeable lens. For this reason, it has been impossible to perform center holding control of the correction optical system in relation to the operation of the operation system in the camera body of the photographer and the shooting conditions determined by the camera body.

In the present invention, a center holding start signal is newly provided as a dedicated signal in communication from the camera body to the interchangeable lens, so that the correction optical system of the camera shake correction unit in the interchangeable lens can be set according to the operation of the camera body by the photographer. The center holding control can be performed, and the center holding control of the correction optical system can be immediately started when the sleep of the camera body is released.
In other words, the correction optical system of the camera shake correction unit in the interchangeable lens can be controlled to hold the center before the release half-press of the camera body. Thus, it is possible to shorten the time from when the release halfway is pressed until it becomes possible to take a photograph having a camera shake correction effect.

Furthermore, according to the present invention, a center holding end signal is newly provided as a dedicated signal for communication from the camera body to the interchangeable lens, so that it is subordinate to the camera shake correction control in shooting conditions that clearly do not require camera shake correction control. The center holding control can be terminated without doing so. The transmission timing of the center holding end signal from the camera body can be set arbitrarily by the photographer.
In other words, if the camera body automatically determines shooting conditions, etc., and determines that camera shake correction control is clearly unnecessary, it does not command execution of camera shake correction control, and only center holding control is executed. Can be ordered. Furthermore, under certain shooting conditions, etc., a failed photo is taken due to unnecessary camera shake correction operation, power for unnecessary camera shake correction operation is wasted, and redundant center holding control is executed. Can be prevented.

A control flow of the camera body 100 according to the present embodiment will be described with reference to FIG.

First, when the photographer turns on the power button of the camera body 100 (S101), the sleep of the camera body 100 is released (S102).
The camera body 100 is canceled not only when the power button, which is the main power source of the camera body 100, is switched on, but also by the photographer operating the operation system 107 of the camera body 100 that is sleeping with auto power off. This is also executed (S103).

The camera body 100 starts communication with the interchangeable lens 200 when sleep is canceled.

First, the camera body 100 transmits a command signal CMD to the interchangeable lens 200 in order to request lens data relating to the setting state of the interchangeable lens 200 (S104).

When the interchangeable lens 200 receives the command signal CMD from the camera body 100, the interchangeable lens 200 prepares lens data corresponding to the command signal CMD and returns it to the camera body 100.
Then, the camera body 100 receives the lens data transmitted from the interchangeable lens 200 (S105).
The lens data includes information necessary for photographing such as on / off information of the camera shake correction switch 208 of the interchangeable lens 200, focal length, aperture, and the like.

When communication is completed between the camera body 100 and the interchangeable lens 200, the camera body 100 transmits a center holding start signal CSs to the interchangeable lens 200 (S106).
The center holding start signal CSs is a dedicated signal for instructing the camera body 100 to start center holding control with respect to the interchangeable lens 200. The center holding control refers to control in which the interchangeable lens 200 maintains the correction optical system 210 in the camera shake correction unit 209 so that the optical axis of the correction optical system 210 and the optical axis of the lens optical system coincide with each other.

After transmitting the center holding start signal CSs to the interchangeable lens 200 in S106, the camera body 100 once clears the 60-second monitoring timer and activates the 60-second monitoring timer (S107).

After transmitting the center holding start signal CSs to the interchangeable lens 200, the camera body 100 monitors whether the release button is half-pressed for 60 seconds (S108, S109).

60 seconds in S108 means the time until the camera body 100 is not operated and the interchangeable lens 200 is instructed to end the center holding control instructed to start in S106.
That is, this 60 seconds indicates the maximum time for executing the center holding control, and is stored in a storage unit such as the camera control unit 104 on the camera body 100 side and indicates a predetermined time that can be changed by the photographer. Yes.

If it is determined in S108 that the release button of the camera body 100 is not half-pressed even after monitoring for 60 seconds, the camera body 100 transmits a center holding end signal CSe to the interchangeable lens 200 and enters a sleep state (S110). , S111). When the camera body 100 enters a sleep state, the camera body 100 enters a no-communication state with the interchangeable lens 200.

The center holding end signal CSe transmitted from the camera body 100 to the interchangeable lens 200 in S110 is a dedicated signal that instructs the interchangeable lens 200 to end the center holding control. When the interchangeable lens 200 receives the center holding end signal CSe, the interchangeable lens 200 ends the center holding control.

If the camera body 100 determines in step S109 that the release button has been half-pressed before entering the sleep state, the camera body 100 transmits a correction start signal OSs to the interchangeable lens 200 (S112).
The correction start signal OSs is a command signal for the camera body 100 to start the camera shake correction control of the camera shake correction unit 209 with respect to the interchangeable lens 200. Accordingly, the camera shake correction unit 209 starts driving the movable member including the correction optical system 210 in order to cancel the displacement of the imaging position of the lens optical system due to the camera shake of the photographer.

After transmitting the correction start signal OSs to the interchangeable lens 200, the camera body 100 once clears the 6-second monitoring timer and activates the 6-second monitoring timer (S113). For 6 seconds here, when the release full-press operation is not performed on the camera body 100, from the start of the camera shake correction control commanded to the interchangeable lens 200 by the camera body 100 to the end of the camera shake correction control. It means the maximum time.
The camera body 100 determines whether to allow or prohibit the camera shake correction control of the interchangeable lens 200 based on the camera shake correction control start command and the camera shake correction control end command. If camera shake correction control is permitted for the interchangeable lens 200 without limitation, the power of the camera body 100 itself is wasted, and thus the maximum time during which the interchangeable lens 200 can perform camera shake correction control is limited.

The camera body 100 monitors whether or not the release button is fully pressed until six seconds have elapsed after transmitting the correction start signal OSs (S114, S115).

After the release half-press in S109, the camera body 100 performs a general photographing operation when the release is fully pressed before 6 seconds elapse (S116). The photographing operation is a conventional general photographing operation, and includes a series of operations such as a mirror up operation after fully releasing the shutter, a shutter operation, image signal capturing by the image sensor, image processing, and recording. The photographing operation is not a major feature of the present invention, and thus detailed description thereof is omitted.

If it is determined in S115 that the release button is not fully pressed, the camera body 100 proceeds to the next step without performing the shooting operation in S116.

After the photographing operation in S116 is completed, the camera body 100 confirms whether or not the release half-press state is still present (S117). When the photographer intends to shoot continuously, it is assumed that the release half-pressed state is maintained in order to continue the AF operation and the like even after the shooting operation is completed by fully pressing the release. It is.
That is, in this case, since the photographer is likely to observe the subject through the viewfinder or the like, the camera shake correction control is not ended immediately, but the next camera shake correction control is continued. It is desirable to monitor whether there is a full release release for the shooting operation.

If it is still in the release half-pressed state in S117, the process returns to S115 to determine whether or not the release is fully pressed.

If the release half-press state is not reached in S117, the process returns to S114, and it is monitored whether 6 seconds have elapsed since the correction start signal OSs was transmitted to the interchangeable lens 200 in S112.
When 6 seconds have elapsed, it is determined that the release button has not been pressed at all, and it is determined that shooting by the photographer has ended, and a correction end signal OSe is transmitted to the interchangeable lens 200 (S118). Thereafter, the process returns to S107 (A).

The correction end signal OSe is a command signal for the camera body 100 to end the camera shake correction control of the camera shake correction unit 209 with respect to the interchangeable lens 200. Accordingly, the camera shake correction unit 209 ends the camera shake correction control for canceling the displacement of the imaging position of the lens optical system due to the camera shake of the photographer.

After transmitting the correction end signal OSe in S118, the interchangeable lens 200 only ends the camera shake correction operation, and the center holding control is continued. The interchangeable lens 200 continues the center holding control unless the center holding end signal CSe is transmitted from the camera body 200.

When returning to S107, the monitoring timer for 60 seconds is cleared again, and it is monitored whether or not the release is half-pressed during 60 seconds. If the release is half-pressed for 60 seconds, as described above, the control proceeds to the camera shake correction operation, the photographing operation, and the like.

If the release is not half-pressed for 60 seconds, it is determined that the photographer does not perform the photographing operation, and the center holding end signal CSe is transmitted to the interchangeable lens 200, and the sleep state is entered (S110, S111).

That is, once the camera body 100 is in the release half-pressed state in S109, the camera body 100 performs a camera shake correction operation and monitors whether or not the release is fully pressed to determine whether to perform the shooting operation. After that, if the release button is not pressed, the center holding end signal CSe is transmitted last to enter the sleep state.

Therefore, the interchangeable lens 200 does not immediately drop the movable member including the correction optical system 210 in the direction of gravity after the image stabilization operation of the camera body 100 is completed and immediately ends the camera shake correction operation. The center holding control is continued for 2 seconds.
As a result, even while waiting for the next photographing operation for the photographer, an unpleasant image from the viewfinder or the like due to the optical axis of the correction optical system 210 being shifted from the optical axis of the lens optical system. Can be prevented from being observed.

Next, the control flow of the interchangeable lens 200 will be described with reference to FIG.

First, the interchangeable lens 200 is released from sleep in conjunction with the camera body 100 returning from sleep (S201). Since the interchangeable lens 200 is supplied with electric power from the camera body 100, when the power of the camera body 100 is turned on, the lens control unit 201 is activated to cancel the sleep.

When the interchangeable lens 200 returns from sleep, it communicates with the camera body 100 and receives various command signals and signals for camera shake correction control (S202). Each signal received here is discriminated in the subsequent steps, and the interchangeable lens 200 performs control corresponding to each signal.

First, the interchangeable lens 200 determines whether the received signal is a command signal CMD (S203). If it is determined that the received signal is the command signal CMD, lens data corresponding to each received command signal CMD is prepared and sequentially returned to the camera body 100 (S204). If it is determined that the command signal is not CMD, the process proceeds to the next step.

Next, the interchangeable lens 200 determines whether the received signal is the center holding start signal CSs (S205). When it is determined that the received signal is the center holding start signal CSs, the interchangeable lens 200 replaces the correction optical system 210 of the camera shake correction unit 209 with the lens optical system and the optical axis as instructed by the camera body 100. The center holding control is started to control to maintain the same (S206). If it is determined that the signal is not the center holding signal CSs, the process proceeds to the next step.

In the present invention, as described above, the center holding start signal CSs is provided as a dedicated signal for instructing the interchangeable lens 200 to start the center holding control as described above. The interchangeable lens 200 can start center retention control according to a command from the camera body 100, that is, a center retention start signal CSs, instead of a fixed control flow incorporated in the interchangeable lens 200 in advance.

Next, the interchangeable lens 200 determines whether the received signal is the correction start signal OSs (S207). If it is determined that the received signal is the correction start signal OSs, the interchangeable lens 200 starts camera shake correction control as instructed by the camera body 100 (S208). If it is determined that the signal is not the correction start signal OSs, the process proceeds to the next step.

When the interchangeable lens 200 starts camera shake correction control, first, the angular velocity sensor 213 detects the amount of shake, and the correction optical system position detection device 214 detects the current position of the correction optical system 210. Next, the lens control unit 201 calculates the difference between the target position for correcting the shake amount due to camera shake and the current position of the correction optical system 210, and includes the correction optical system 210 so that the difference becomes zero. The movable member is driven and controlled.

The means for driving the movable member is the VCM 212, and the correction optical system 210 is driven on a plane perpendicular to the optical axis by controlling the amount of current supplied to the coil of the VCM 212 and its direction. By driving the correction optical system 210 so that the difference between the target position for correcting the blur amount and the current position of the correction optical system 210 becomes zero, the displacement of the imaging position due to camera shake of the photographer is cancelled. It is possible to shoot images that are not affected by camera shake.

Next, the interchangeable lens 200 determines whether the received signal is the correction end signal OSe (S209). If it is determined that the received signal is the correction end signal OSe, the interchangeable lens 200 ends the camera shake correction control as instructed by the camera body 100 (S210). If it is determined that it is not the correction end signal OSe, the process proceeds to the next step.

Next, the interchangeable lens 200 determines whether the received signal is the center holding end signal CSe (S211). If it is determined that the received signal is the center holding end signal CSe, the interchangeable lens 200 ends the center holding control as instructed by the camera body 100 (S212). When it is determined that it is not the center holding end signal CSe, the process proceeds to the next step.

As described above, the camera body 100 does not transmit the center holding end signal CSe to the interchangeable lens 200 unless 60 seconds have elapsed after transmitting the center holding start signal CSs.

The center holding control after the end of the photographing operation is for improving the appearance when the photographer observes the viewfinder after the end of the camera shake correction control and preparing for the next successive photographing.

In the interchangeable lens 200, when the camera shake correction control is simply ended, the correction optical system 210 falls in the direction of gravity in the camera shake correction unit 209 immediately after the photographing operation. This causes a photographer who wishes to perform continuous shooting to observe a sudden image change in the viewfinder due to the correction optical system 210 immediately falling in the direction of gravity.

In addition, for a photographer who repeats half-pressing of the release after shooting because the shooting is continuously performed, the correction optical system 210 is greatly decreased by repeatedly falling in the direction of gravity or being controlled to maintain the center. An uncomfortable and uncomfortable image can be observed in the viewfinder.

Therefore, after the camera shake correction is completed, the camera shake correction control is not simply ended, but the center holding control is executed for a predetermined time immediately after that to prepare for the next successive shooting operation.

When each signal (command signal CMD, center holding start signal CSs, correction start signal OSs, correction end signal OSe, center holding end signal CSe) is received in the communication with the camera body 200 in S202, it corresponds to each signal. Control is performed, and then it is determined whether the received signal is a sleep signal (S213). The sleep signal is a signal for instructing the interchangeable lens 200 from entering the sleep state from the camera body 100. If it is determined that the received signal is a sleep signal, the interchangeable lens 200 enters a sleep state as instructed by the camera body 100 (S214). If it is determined that the signal is not a sleep signal, communication with the camera body 100 is performed again in S202.

(Other examples: camera body)
Next, the control flow of the camera body 100 in another embodiment will be described with reference to FIG.

The flowchart of the other embodiment shown in FIG. 5 for the camera body 100 is obtained by adding control for determining whether camera shake correction control is unnecessary to the flowchart of the embodiment shown in FIG.
Control for determining whether camera shake correction control is unnecessary is added before S112 for transmitting the correction start signal OSs and before S118 for transmitting the correction end signal OSe from the camera body 100 to the interchangeable lens 200 (S10C). ).

In S <b> 10 </ b> C, in the camera body 100, the camera control unit 104 refers to shooting settings and shooting conditions to determine when camera shake correction control is unnecessary.

The shooting settings that do not require camera shake correction control are specifically remote control shooting, tripod shooting, and the like, where the camera body 100 is installed and camera shake is not expected to occur.
Shooting conditions that do not require camera shake correction control are shooting conditions that are assumed to have a sufficient shutter speed in shooting and have little effect on the shot image due to camera shake.

If it is determined in S10C that camera shake correction control is unnecessary, the camera body 100 commands the interchangeable lens 200 to transmit a correction start signal OSs for instructing start of camera shake correction control (S112) and to end it. The step of transmitting the correction end signal OSe (S118) is skipped.

If it is determined in S10C that camera shake correction control is not necessary, the camera body 100 transmits a correction start signal OSs to instruct the interchangeable lens 200 to execute camera shake correction control (S112), and the correction ends. The signal OSe is transmitted (S118).

As described above, the camera body 100 can determine the necessity of the camera shake correction control by judging the shooting settings and shooting conditions, so that the photographer manually sets a switch for allowing the camera shake correction control. There is no need to switch.
Accordingly, in the case of predetermined shooting conditions and shooting conditions that do not require camera shake correction control, the camera body 100 automatically stops transmitting the correction start signal OSs and the correction end signal OSe to the interchangeable lens 200, and the center It becomes possible to control the interchangeable lens 200 so as to command only the holding control.

As described above, in the present invention, the center holding start signal is provided as a dedicated signal for starting the center holding control from the camera body to the interchangeable lens. Accordingly, it is possible to start center holding control of the interchangeable lens according to the operation state of the camera body regardless of the presence or absence of a fixing means for fixing the movable member including the correction optical system of the camera shake correction unit. It is possible to shorten the shooting time lag until the blur correction effect becomes sufficiently stable and shooting is possible.

Furthermore, in the present invention, a center holding end signal is provided as a dedicated signal for ending the center holding control from the camera body to the interchangeable lens. As a result, the camera body can issue an instruction for center holding control independent of camera shake correction control to the interchangeable lens. Therefore, even in shooting settings and shooting conditions that do not require camera shake correction control, center holding control independent of camera shake correction control is possible.

Furthermore, in the present invention, it is necessary for the camera body to manually switch the switch for determining whether to permit camera shake correction control by determining the necessity of camera shake correction control based on the shooting settings and shooting conditions. Therefore, only the center holding control can be automatically commanded to the interchangeable lens.

DESCRIPTION OF SYMBOLS 100 Camera body 101 Battery 102 Power supply device 103 Imaging device 104 Camera control part 105 AF sensor 106 AE sensor 107 Operation system 108 Image processing part 109 Memory | storage device 110 Display apparatus

200 Interchangeable lens 201 Lens control unit 202 Encoder 203 Diaphragm 204 Aperture drive unit 205 AF lens group 206 AF drive unit 207 Camera shake correction control unit 208 Camera shake correction switch 209 Camera shake correction unit 210 Correction optical system 211 VCM drive unit 212 VCM
213 Angular velocity sensor 214 Correction optical system position detection device 215 Lens frame 216 Magnet 217 Coil 218 Spherical rolling element 219 Yoke

300 mounts

CLK Clock signal CMD Command signal ANS Answer signal

CSs Center holding start signal CSe Center holding end signal OSs Correction start signal OSe Correction end signal

Claims (3)

In a camera system in which an interchangeable lens can be attached to the camera body, and communication is performed between the camera body and the interchangeable lens.
The camera body to the interchangeable lens,
Send a correction start signal to command camera shake correction control start,
Send a correction end signal to command the end of camera shake correction control,
The interchangeable lens is
A part of the lens optical system or a lens group is a correction optical system,
The correction optical system is in contact with the wall surface in the direction of gravity without energization, and the driving means for moving the movable member including the correction optical system in a plane perpendicular to the optical axis with respect to the fixed member is the movable member. The movable member is driven by electromagnetic force generated by supplying a current to the coil, and a magnet installed on the side or the fixed member side and a coil installed on the opposite side thereof.
The camera system detects the camera shake amount of the camera system and the current position of the correction optical system, and cancels the difference between the target position of the correction optical system calculated from the camera shake amount and the current position of the correction optical system. As described above, it has an optical camera shake correction mechanism for performing camera shake correction control by moving the correction optical system in a plane perpendicular to the optical axis,
The camera body is
After the power supply of the camera body is operated and before the camera body transmits the correction start signal to the interchangeable lens, a center holding start signal is transmitted to the interchangeable lens,
After the correction end signal is transmitted to the interchangeable lens, a center holding end signal is transmitted to the interchangeable lens,
The interchangeable lens is
After receiving the center holding start signal from the camera body, start center holding control before the release half-press operation so that the optical axis of the correction optical system and the optical axis of the lens optical system coincide with each other,
After receiving the center holding end signal from the camera body, the center holding control is ended.
A camera system characterized by that. An interchangeable lens can be attached to the camera body, and constitutes a camera system that communicates between the camera body and the interchangeable lens,
A part of the lens optical system or a lens group is a correction optical system,
The correction optical system is in contact with the wall surface in the direction of gravity without energization, and the driving means for moving the movable member including the correction optical system in a plane perpendicular to the optical axis with respect to the fixed member is the movable member. The interchangeable lens is composed of a magnet installed on the side or the fixed member side and a coil installed on the opposite side, and the movable member is driven by electromagnetic force generated by supplying current to the coil Because
After receiving the center holding start signal from the camera body operated with the power supply, the center holding control is started before the release half-press operation so that the optical axis of the correction optical system and the optical axis of the lens optical system coincide with each other. ,
Furthermore, when a correction start signal is received from the camera body, camera shake correction control is started thereafter.
Further, when a correction end signal is received from the camera body, the camera shake correction control is then ended,
Furthermore, the center holding control is ended after receiving the center holding end signal from the camera body. An interchangeable lens can be attached to the camera body, and is a camera shake correction unit that constitutes a camera system that communicates between the camera body and the interchangeable lens,
A part of the lens optical system or a lens group is a correction optical system,
The correction optical system, blur amount detection means, correction optical system position detection means,
The correction optical system is in contact with the wall surface in the direction of gravity without energization, and the driving means for moving the movable member including the correction optical system in a plane perpendicular to the optical axis with respect to the fixed member is the movable member. Alternatively, it is composed of a magnet installed on the fixed member side and a coil installed on the opposite side, and the movable member is driven by electromagnetic force generated by supplying current to the coil,
As the interchangeable lens receives the center holding start signal from the camera body operated with the power supply, the optical axis of the correction optical system and the optical axis of the lens optical system of the interchangeable lens coincide before the release half-pressing operation. Start the center holding control to
As the interchangeable lens receives a correction start signal from the camera body, the camera system detects the blur amount of the camera system detected by the camera shake amount detection unit and the correction detected by the correction optical system position detection unit. The correction optical system driving means calculates the current position of the optical system and cancels the difference between the target position of the correction optical system calculated from the blur amount and the current position of the correction optical system. Drive the correction optical system in a plane perpendicular to the optical axis,
After the interchangeable lens receives a center holding end signal from the camera body, the center holding control is ended.
A camera shake correction unit characterized by that.

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