JP2021113836A - Imaging apparatus, lens unit, imaging system, control method, and program - Google Patents

Abstract

To provide an imaging apparatus capable of reducing the effect of vibration due to the shutter-related operation, a lens unit, an imaging system, a control method, and a program.SOLUTION: The imaging apparatus is an imaging apparatus capable of mounting a lens unit. The imaging apparatus includes: first correction means that is moveable for image blur correction; and control means that controls the first correction means. The control means corrects a driving signal for the first correction means by using the first correction data for correcting the impact due to shutter-related operation.SELECTED DRAWING: Figure 1

Description

The present invention relates to an optical device such as an image pickup device and an interchangeable lens used in an image pickup system having an image blur correction function.

Conventionally, an interchangeable lens imaging system that corrects image shake caused by camera shake or the like by moving the correction means using a detection signal from a shake detection sensor that detects vibration caused by camera shake or the like has been known. There is. When the camera body has a focal plane type shutter mechanism, vibration based on the operation related to the shutter (hereinafter referred to as shutter vibration) may affect the blur detection sensor and the correction means. Shutter vibration is a high-frequency vibration compared to the frequency band of camera shake, and it is difficult to correct it by a correction means optimized for camera shake correction. Patent Document 1 describes a camera system that adds correction data unique to a drive signal for driving a correction means provided in an interchangeable lens in accordance with a shutter vibration start timing in order to reduce the influence of shutter vibration. It is disclosed.

Japanese Patent No. 3342251

In the camera system of Patent Document 1, when a blur detection sensor and a correction means are provided in the camera body in order to improve the function of correcting image blur, these members are physically close to the shutter mechanism, and the shutter. It may be greatly affected by vibration. However, the camera system of Patent Document 1 may not be able to reduce the influence of shutter vibration on these members.

An object of the present invention is to provide an image pickup device, a lens device, an image pickup system, a control method, and a program capable of reducing the influence of vibration based on an operation related to a shutter.

The image pickup device as one aspect of the present invention is an image pickup device to which a lens device can be attached, and includes a first correction means that can be moved for image blur correction and a control means that controls the first correction means. The control means has, and is characterized in that the drive signal for the first correction means is corrected by using the first correction data for correcting the impact based on the operation related to the shutter.

Further, the lens device as another aspect of the present invention is a lens device that can be attached to an image pickup device having a first correction means that can be moved for image blur correction, and can be moved for image blur correction. The second correction means has a second correction means and a control means for controlling the second correction means, and the control means uses a drive signal for the second correction means to correct an impact based on an operation related to the shutter. It is characterized in that the correction is performed using the correction data of the above, and the first correction data for correcting the impact affecting the drive signal for the first correction means is transmitted to the image pickup apparatus.

Further, in the control method as another aspect of the present invention, a first correction means that is mountable to a lens device and can be moved for image blur correction and a control means that controls the first correction means are provided. It is a control method of an image pickup apparatus, and is characterized by having a step of correcting a drive signal for a first correction means by using a first correction data for correcting an impact based on an operation related to a shutter.

According to the present invention, it is possible to provide an image pickup device, a lens device, an image pickup system, a control method, and a program capable of reducing the influence of vibration based on an operation related to a shutter.

It is a block diagram of the image pickup system which concerns on embodiment of this invention. It is a flowchart which shows the photographing operation of the camera body of Embodiment 1. FIG. It is a flowchart which shows the operation of the interchangeable lens side of Embodiment 1. It is a flowchart which shows the serial communication interrupt operation of the interchangeable lens of Embodiment 1. It is a flowchart which shows the operation of the image blur correction interrupt of the camera body and an interchangeable lens of Embodiment 1. It is a figure which shows an example of the shutter vibration correction data of Embodiment 1. FIG. It is a figure which shows an example of the shutter vibration correction data held in each of a camera body and an interchangeable lens. It is a figure which shows an example of the blur correction waveform of Embodiment 1. FIG. It is a figure which shows an example of the shutter vibration correction data of Embodiment 2. It is a figure which shows an example of the blur correction waveform of Embodiment 2.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each figure, the same member is given the same reference number, and duplicate description is omitted.

FIG. 1 is a block diagram of an imaging system 100 according to an embodiment of the present invention. The imaging system 100 includes a camera body (imaging device) 101 and an interchangeable lens (lens device) 101 that can be attached to the camera body 101.

Before performing the shooting operation (so-called aiming), the focal plane shutter 110 is in the open state, and the shooting light beam from the subject passes through the shooting optical system of the interchangeable lens 102 and is imaged on the image pickup surface of the image pickup unit 112. .. Since the image corresponding to the image signal generated by using the image pickup signal from the image pickup unit 112 is displayed on the LCD 119, the photographer can confirm the subject image during aiming.

The imaging unit (first correction means) 112 includes an imaging sensor such as a CCD or CMOS sensor, and can calculate vector information indicating the moving direction and moving speed of the subject. The vector information calculated by the imaging unit 112 is input to the camera MPU (control means) 107.

Further, the imaging unit 112 can be moved to correct image blur caused by camera shake of the photographer or the like. The camera image blur correction control circuit 103 drives the image pickup unit 112 via the linear motor 104.

When the shooting operation (the operation of starting the exposure) is started, the shutter drive circuit 111 drives the focal plane shutter 110. The shutter operation before the start of exposure differs depending on the setting. When the front curtain mechanical shutter operation is performed, the focal plane shutter 110 is closed and the stored signal of the imaging unit 112 is reset before the exposure, and then the focal plane shutter 110 is opened and the exposure process is started. On the other hand, in the case of setting to perform the front curtain electronic shutter operation, the exposure process starts after the accumulated signal of the imaging unit 112 is reset without closing the focal plane shutter 110. When the exposure process is started, the photographed luminous flux is formed as a subject image on the imaging surface of the imaging unit 112. The subject image is photoelectrically converted by the imaging unit 112 to become an imaging signal.

The rear curtain shutter also has a mechanical rear curtain and an electronic rear curtain. Since the electronic rear curtain closes the rear curtain with the electronic shutter, shutter vibration does not occur, but the mechanical rear curtain vibrates in the same way as the front curtain mechanical shutter. In addition to the impact caused by the running of the rear curtain, vibration may be generated by the charging operation (movement such as winding up the motor) for running the rear curtain.

The timing generator 113 controls the storage operation, the reading operation, the reset operation, and the like of the imaging unit 112. The CDS circuit (double correlation sampling circuit) 114 reduces the accumulated charge noise of the imaging unit 112. The gain control circuit 115 amplifies the imaging signal. The A / D converter 116 converts the amplified imaging signal from analog to digital image data. The video signal processing circuit 117 performs filter processing, color conversion processing, gamma processing, and the like on the image data digitized by the A / D converter 116. The video signal processed by the video signal processing circuit 117 is stored in the buffer memory 118, displayed as a video on the LCD 119, or recorded on the removable memory card 120.

The operation unit 121 is switches for setting the shooting mode and the recorded image file size of the camera body 101, and releasing at the time of shooting. The camera MPU 107 controls the entire control of the camera body 101, and communicates with the lens MPU 124 via the interface circuit 122 on the camera body 101 side and the interface circuit 123 on the interchangeable lens 102 side. In this communication, various data are exchanged between the camera body 101 and the interchangeable lens 102.

The output from the temperature sensor 140 such as the thermistor is input to the camera MPU 107 and used for camera control, or is input to the lens MPU 124 via the interface circuits 122 and 123 and used for lens control.

The camera angular velocity sensor 105 detects rotational blur. The blur signal from the camera angular velocity sensor 105 is converted into a digital signal by the ADC 106 and input to the camera MPU 107. The camera MPU 107 performs various signal processing, calculates an image pickup unit drive target signal, and blurs the drive signal according to the difference between the calculated image pickup unit drive target signal and the image pickup unit position signal output from the image pickup unit encoder 108. Output to the correction control circuit 103. Image blur correction by moving the image pickup unit 112 is performed by feeding back the image pickup unit position signal output from the image pickup unit encoder 108 to the camera image blur correction control circuit 103. Such image blur correction is performed on each of the three axes of the pitch axis, the yaw axis, and the roll axis.

The interchangeable lens 102 includes a focus lens 125, a zoom lens 126, an image blur correction lens (second correction means) 127, and an aperture 128 as a part of the photographing optical system.

The focus control circuit 129 drives the focus lens 125 via the focus lens driving motor 130 using the control signal from the lens MPU 124. In addition to the focus lens drive circuit, the focus control circuit 129 also includes a focus encoder that outputs a zone pattern signal and a pulse signal according to the movement of the focus lens 125. The focus encoder can detect the subject distance.

The zoom lens 126 is moved by the photographer operating a zoom operation ring (not shown). The zoom encoder 131 outputs a zone pattern signal according to the movement of the zoom lens 126. The lens MPU 124 reads the signals from the focus encoder and the zoom encoder 131, and acquires the photographed image magnification from the data stored in advance by the combination of the subject distance and the focal length.

The lens image blur correction control circuit 132 drives the image blur correction lens 127 via a linear motor 133. Here, a specific method of image blur correction will be described. The blur signal from the lens angular velocity sensor 135 that detects rotational blur is converted into a digital signal by the ADC 136 and input to the lens MPU 124. The lens MPU 124 performs various signal processing and calculates a correction lens drive target signal. After that, the lens MPU 124 outputs a drive signal corresponding to the difference between the calculated correction lens drive target signal and the correction lens position signal output from the correction lens encoder 134 to the lens image blur correction control circuit 132. Image blur correction by moving the image blur correction lens 127 is performed by feeding back the correction lens position signal output from the correction lens encoder 134 to the lens image blur correction control circuit 132. Such image blur correction is performed on each of the two axes, the pitch axis and the yaw axis.

The aperture control circuit 137 drives the aperture 128 via the stepping motor 138 using the control signal from the lens MPU 124. The switch 139 is a selection switch for selecting ON / OFF of the lens image blur correction.
[Embodiment 1]
The configuration of the imaging system of this embodiment is the same as the configuration of the imaging system 100 described with reference to FIG. FIG. 2 is a flowchart showing a shooting operation of the camera body 101 of the present embodiment. When the power of the camera body 101 is turned on, the flow of FIG. 2 starts.

In step S201, the camera MPU 107 performs initial communication with the interchangeable lens 102 to determine the model. The camera MPU 107 also communicates about shutter vibration correction data for reducing the influence of vibration based on the operation related to the shutter (hereinafter, shutter vibration). The communication format related to the shutter vibration correction data will be described later.

In step S202, the camera MPU 107 determines whether or not the release switch of the operation unit 121 is half-pressed (SW1 is turned on). If it is pressed halfway, the process proceeds to step S203, and if not, this flow ends. When SW1 is ON, the LIVEVIEW state is also included. In the configuration of this embodiment, SW1 is always ON.

In step S203, the camera MPU 107 performs camera lens status communication with the lens MPU 124 via the interface circuits 122 and 123. Specifically, the camera MPU 107 transmits the state of the camera body 101 (state of the release switch, shooting mode, shutter speed, etc.) to the lens MPU 124. Further, the camera MPU 107 receives the state of the interchangeable lens 102 (focal length, state of the aperture 128, driving state of the focus lens 125, etc.). The state of the camera body 101 also includes information on the setting state of the shutter operation of the camera body 101, such as the front curtain mechanism, the front curtain electronic, and the complete electronic shutter including the rear curtain. The camera lens status communication is performed not only in this step but also when the state of the camera body 101 changes or when the camera body 101 wants to check the state of the interchangeable lens 102.

In step S204, the camera MPU 107 performs a focus detection process to acquire a focus lens drive amount for focusing on the subject.

In step S205, the camera MPU 107 transmits a focus lens drive command to the interchangeable lens 102. For example, the drive target pulse amount of the focus encoder is transmitted as the focus lens drive command.

In step S206, the camera MPU 107 performs the focus detection process again.

In step S207, the camera MPU 107 determines whether the subject is within the focusing depth. If the subject is within the focusing depth, the process proceeds to step S208, and if not, the process returns to step S202.

In step S208, the camera MPU 107 performs focusing display by, for example, changing the color of the focus detection frame on the LCD 119 or generating sound. The camera MPU 107 also displays the focus even in the LIVEVIEW state.

In step S209, the camera MPU 107 measures the light and calculates the exposure time Tv and the aperture value (aperture drive amount) using the photometric result (luminance).

In step S210, the camera MPU 107 determines whether or not the release switch of the operation unit 121 is fully pressed (SW2 is ON). If it is fully pressed, the process proceeds to step S211. If not, the process returns to step S202.

In step S211 the camera MPU 107 performs pre-exposure processing. The exposure pretreatment is a pretreatment for operating the focal plane shutter 110.

In step S212, the camera MPU 107 transmits an aperture drive command to the interchangeable lens 102 to drive the aperture 128. For example, the aperture drive amount calculated in step S209 is transmitted as an aperture drive command.

In step S213, the camera MPU 107 drives the front curtain shutter. It should be noted that whether or not the front curtain is mechanically driven is determined by the camera setting.

In step S214, the camera MPU 107 exposes the subject image to the imaging unit 112 and accumulates electric charges.

In step S215, when the exposure time elapses, the camera MPU 107 drives the rear curtain shutter to end the exposure. If the fully electronic shutter is selected in the camera settings, the rear curtain is also controlled by the electronic shutter.

In step S216, the camera MPU 107 transfers (reads) charges from the imaging unit 112.

In step S217, the camera MPU 107 causes the CDS circuit 114, the gain control circuit 115, and the A / D converter 116 to convert the imaging signal into digital data and stores it in the buffer memory 118.

In step S218, the camera MPU 107 transmits an aperture opening command to the interchangeable lens 102 as an aperture driving command to return the aperture 128 to the open state.

In step S219, the camera MPU 107 performs an exposure end process.

In step S220, the camera MPU 107 performs image correction processing such as gamma correction and compression processing.

In step S221, the camera MPU 107 displays the image correction-processed image data on the LCD 119 and records the image data on the memory card 120.

If there is a request for an image blur correction interrupt during the shooting operation, interrupt processing is performed. The image blur correction interrupt is a timer interrupt that occurs at regular intervals, and image blur correction control is performed in the pitch direction (vertical direction), yaw direction (horizontal direction), and roll direction (direction of rotation around the optical axis). ..

FIG. 3 is a flowchart showing the operation of the interchangeable lens 102 side of the present embodiment. When the interchangeable lens 102 is attached to the camera body 101 and serial communication is performed from the camera body 101 to the interchangeable lens 102, the flow of FIG. 3 starts.

In step S301, the lens MPU 124 performs initial communication with the camera body 101 to determine the model. The lens MPU 124 also communicates about shutter vibration correction data for reducing the influence of shutter vibration.

In step S302, the lens MPU 124 performs initial settings for lens control and image blur correction control.

In step S303, the lens MPU 124 detects the state of switches (not shown) and the position of the zoom focus. The switches include, for example, a switch for switching between autofocus and manual focus, and an ON / OFF switch for an image blur correction function.

In step S304, the lens MPU 124 determines whether or not a focus drive command has been acquired from the camera body 101. If the focus drive command is acquired, the process proceeds to step S305. If not, the process proceeds to step S309.

In step S305, the lens MPU 124 detects the number of pulses of the focus encoder and controls the drive of the focus lens 125 until the number of pulses of the focus encoder reaches the drive target pulse number (target drive amount) acquired in step S304. ..

In step S306, the lens MPU 124 determines whether the focus lens 125 has reached the target drive position. If the target drive position is reached, the process proceeds to step S307, and if not, the process proceeds to step S308.

In step S307, the lens MPU 124 stops driving the focus lens 125.

In step S308, the lens MPU 124 sets the speed of the focus lens driving motor 130 according to the number of remaining driving pulses. Specifically, the lens MPU 124 decelerates the focus lens driving motor 130 as the number of remaining driving pulses decreases.

In step S309, the lens MPU 124 locks the image blur correction lens 127 at the center of the optical axis when the ON / OFF switch of the image blur correction function is detected in step S303. On the other hand, when the ON / OFF switch of the image blur correction function is detected in step S303 and SW1 is detected, the lens MPU 124 unlocks (unlocks) the image blur correction lens 127. The image blur correction is enabled.

In step S310, the lens MPU 124 determines whether or not a command to stop all drive (stop driving all actuators in the interchangeable lens 102) has been acquired from the camera body 101. If the all drive stop command is acquired, the process proceeds to step S311. If not, the process returns to step S303. When a predetermined time elapses without any operation on the camera body 101 side, the camera body 101 transmits a full drive stop command.

In step S311 the lens MPU 124 performs full drive stop control. Specifically, the lens MPU 124 stops driving all the actuators in the interchangeable lens 102 and goes into a sleep (stop) state.

After that, when the operation is performed on the camera body 101 side, the sleep state of the lens MPU 124 is released by the camera body 101.

If there is a request for a serial communication interrupt or an image blur correction interrupt due to communication from the camera body 101 during the operation of FIG. 3, those interrupt processing is performed. The serial communication interrupt process decodes the communication data and performs lens processing such as aperture drive and focus lens drive according to the decoding result. Further, by decoding the communication data, it is possible to determine SW1ON, SW2ON, the shutter speed, the model of the camera body 101, and the like. The image blur correction interrupt is a timer interrupt that occurs at regular intervals, and image blur correction control is performed in the pitch direction (vertical direction) and the yaw direction (horizontal direction).

FIG. 4 is a flowchart showing the operation of the serial communication interrupt of the interchangeable lens 102 of the present embodiment. When the lens MPU 124 receives the communication from the camera body 101, the flow of FIG. 4 starts.

In step S401, the lens MPU 124 performs command analysis from the camera body 101 and executes processing according to each command. When the focus drive instruction is acquired, the process proceeds to step S402. When the aperture drive command is acquired, the process proceeds to step S403. When the camera lens status communication is acquired, the process proceeds to step S404. When the shutter vibration correction data communication is acquired, the process proceeds to step S405. Shutter vibration correction data communication is basically performed once when the interchangeable lens 102 is attached to the camera body 101 or after the power of the camera body 101 is turned on. If another instruction is acquired, the process proceeds to step S406. Other commands include, for example, focus sensitivity data communication and optical data communication.

In step S402, the lens MPU 124 sets the speed of the focus lens drive motor 130 according to the number of drive target pulses, and starts the focus lens drive.

In step S403, the lens MPU 124 sets the drive pattern of the stepping motor 138 in order to drive the aperture 128 using the acquired aperture drive data. Then, the lens MPU 124 outputs the set drive pattern to the stepping motor 138 via the aperture control circuit 137 to drive the aperture 128.

In step S404, the lens MPU 124 transmits focal length information, IS operating state, etc. to the camera body 101, and receives the status state of the camera body 101 (release switch state, shooting mode, shutter speed, etc.). .. In the present embodiment, the status state includes a tripod detection state detected by using the camera angular velocity sensor 105.

In step S405, the lens MPU 124 converts the acquired shutter vibration correction data into a correction signal for correcting the image blur correction lens drive signal according to the communication format.

In step S406, the lens MPU 124 executes a process according to the acquired instruction.

FIG. 5 is a flowchart showing the operation of the image blur correction interrupt of the camera body 101 and the interchangeable lens 102 of the present embodiment. Since many of the image blur correction interrupt processes of the camera body 101 and the interchangeable lens 102 are common, the same flowchart will be used in the present embodiment.

When an image blur correction interrupt occurs during the main operation of the camera body 101, the camera MPU 107 starts control of image blur correction. Further, when an image blur correction interrupt occurs during the main operation of the interchangeable lens 102, the lens MPU 124 starts controlling the image blur correction.

In step S501, the camera MPU 107 (lens MPU 124) A / D converts the blur signal from the camera angular velocity sensor 105 (lens angular velocity sensor 135) into the ADC 106 (ADC 136).

In step S502, the camera MPU 107 (lens MPU 124) determines whether or not the camera shake correction setting is ON by using the setting content (state of the switch 139) set by the operation unit 121. If the image stabilization setting is ON, the process proceeds to step S504, and if not, the process proceeds to step 511.

In step S503, the camera MPU 107 (lens MPU 124) sets the target drive amount to 0. As a result, the image pickup unit 112 (image blur correction lens 127) is held at the center of the optical axis.

In step S504, the camera MPU 107 (lens MPU124) determines whether or not the setting of the camera body 101 is the setting for performing the front curtain mechanical shutter operation. If the setting is such that the front curtain mechanical shutter operation is performed, the process proceeds to step S505, and if not, the process proceeds to step S506. In the image blur correction interrupt of the interchangeable lens 102, the lens MPU 124 performs the process of this step using the information obtained by the status communication from the camera body 101.

In step S505, the camera MPU 107 (lens MPU 124) determines whether or not a tripod is attached to the camera body 101. If a tripod is attached, the process proceeds to step S506, otherwise the process proceeds to step S507. In the image blur correction interrupt of the interchangeable lens 102, the lens MPU 124 performs the process of this step using the information obtained by the status communication from the camera body 101. When a tripod is attached, the effect of the shutter vibration received is different from that in the handheld state, and using the shutter vibration correction data assuming the handheld state may have the opposite effect. Therefore, the process of this step is executed. In the present embodiment, one of the camera MPU 107 and the lens MPU 124 determines whether or not a tripod is attached to the camera body 101, but the present invention is not limited to this. Each of the camera MPU 107 and the lens MPU 124 may make a judgment, and each judgment may be reflected in the control. In that case, it is preferable that the judgment methods are the same so that the judgments do not match between the camera MPU 107 and the lens MPU 124.

In step S506, the camera MPU 107 (lens MPU 124) sets the shutter vibration correction data to 0.

In step S507, the camera MPU 107 (lens MPU 124) performs a high-pass filter calculation in order to cut low frequency components. Further, the camera MPU 107 (lens MPU 124) switches the time constant of the high-pass filter for a predetermined time from the start of the calculation, and also performs an operation for promptly stabilizing the signal.

In step S508, the camera MPU 107 (lens MPU 124) performs an integration calculation using the calculation result of the high-pass filter as an input. This result is the angular displacement data.

In step S509, the camera MPU 107 (lens MPU 124) adds shutter vibration correction data corresponding to the combination of the camera body 101 and the interchangeable lens 102 to each displacement data. The shutter vibration correction data may be stored in a memory (storage means) (not shown) of the camera body 101 (interchangeable lens 102), or may be acquired from the interchangeable lens 102 (camera body 101). In the processing on the interchangeable lens 102 side, the shutter vibration correction data is added starting from the exposure start timing information notified from the camera body 101.

In step S510, the camera MPU 107 (lens MPU 124) acquires the anti-vibration sensitivity according to the zoom position and the focus position of the interchangeable lens 102, and calculates the target drive amount of the imaging unit 112 (image blur correction lens 127).

In step S511, the camera MPU 107 (lens MPU 124) A / D-converts the displacement signal of the imaging unit 112 (image blur correction lens 127) to the imaging unit encoder 108 (correction lens encoder 134). The calculation result is stored in the RAM area in each MPU.

In step S512, the camera MPU 107 (lens MPU 124) performs a feedback calculation.

In step S513, the camera MPU 107 (lens MPU 124) performs a phase lead compensation calculation in order to obtain a stable control system.

In step S514, the camera MPU 107 (lens MPU 124) inputs the calculation result of step S513 as PWM to the driver circuit in the camera image blur correction control circuit 103 (lens image blur correction control circuit 132). Then, the linear motor 104 (linear motor 133) drives the image pickup unit 112 (image blur correction lens 127) to perform image blur correction.

Hereinafter, the shutter vibration correction data for correcting the drive signal in the present embodiment will be described with reference to FIG. FIG. 6 is a diagram showing an example of shutter vibration correction data of the present embodiment. FIG. 6 shows the exposure timing status and shutter vibration correction data generated by the camera body 101 with the horizontal axis as time.

The shutter vibration correction data is represented by three types of information. Specifically, the information L representing the start timing T1 of the shutter vibration correction data, the end timing T2 of the shutter vibration correction data, and the size of the shutter vibration correction data starting from the ON (start of the exposure operation) of the exposure timing status. be. In the present embodiment, as described above, since the shutter vibration correction data is added to each displacement data, the information L represents the magnitude of the angle. Further, in the present embodiment, since the shutter vibration correction data is added to each of the camera body 101 and the interchangeable lens 102, there are two each of the above-mentioned three types of data. In FIG. 6, the start / end timings of the correction data are different between the camera body 101 and the interchangeable lens 102, but the present invention is not limited to this. By making these timings the same, it is possible to create shutter vibration correction data capable of reducing a larger shutter vibration.

Hereinafter, an operation method for holding the shutter vibration correction data in each of the camera body 101 and the interchangeable lens 102 will be described. The influence of the shutter vibration largely depends on the combination of the camera body 101 and the interchangeable lens 102. Therefore, it is necessary to have shutter vibration correction data determined according to the combination of the camera body 101 and the interchangeable lens 102. Further, the imaging system 100 needs to be able to appropriately process the camera body 101 and the interchangeable lens 102 released later. For that purpose, the camera body 101 needs to have the shutter vibration correction data of the interchangeable lens 102 released before it is released, and also has the information of the interchangeable lens 102 having its own shutter vibration correction data. Further, the camera body 101 needs to acquire the shutter vibration data of the interchangeable lens 102 released after its release from the interchangeable lens 102, and perform the image blur correction described above using the acquired shutter vibration correction data. The interchangeable lens 102 also needs to have a similar configuration. From the above, it is necessary to hold the shutter vibration correction data exchanged by communication in a common format.

FIG. 7 is a diagram showing an example of shutter vibration correction data held by each of the camera body 101 and the interchangeable lens 102 so as to cover the above-mentioned outline. Since the shutter vibration correction data is exchanged by communication, it is necessary to summarize it briefly. In the present embodiment, each of the three types of information can be represented by 4 bits, and the shutter vibration correction data of the camera body 101 and the interchangeable lens 102 can be represented by 1 byte for each type. Further, since the start timing T1 and the end timing T2 are time data from the exposure timing, they basically do not become negative data. On the other hand, since the information L is data representing the magnitude of the angle, it is necessary to be able to express positive and negative data.

For example, as shown in FIG. 7, a case where the camera 8 is equipped with the lens 15 released after the release of the camera 8 will be described. In this case, the camera 8 has shutter vibration correction data up to the combination with the lens 12. On the other hand, the lens 15 has shutter vibration correction data up to the combination with the camera 8. Therefore, the camera 8 acquires the shutter vibration correction data possessed by the lens 15. As described above, since the shutter vibration correction data is held in a common format, the shutter vibration can be appropriately corrected by adding the shutter vibration correction data to the drive signals of the mutual correction means.

Hereinafter, with reference to FIG. 8, when the lens 15 is attached to the camera 8 in FIG. 7 in the present embodiment, the blur correction waveform when image blur correction is performed using the shutter vibration correction data will be described. FIG. 8 is a diagram showing an example of the blur correction waveform of the present embodiment. In FIG. 8, the horizontal axis represents time.

In the blur correction waveform before adding the shutter vibration correction data to the drive signals of the camera body 101 and the interchangeable lens 102, a large blur occurs due to the shutter vibration of the mechanical front curtain. On the other hand, in the blur correction waveform after adding the shutter vibration correction data to each drive signal starting from the exposure timing status, the blur generated by the shutter vibration disappears. Therefore, since the influence of the shutter vibration during the exposure period can be appropriately corrected, the influence on the captured image can be appropriately reduced.

In the example of FIG. 7, L_C that can be expressed in a predetermined format is 0x07, which is the maximum data when trying to express positive or negative data with 4-bit data. That is, it is not possible to appropriately correct the shutter vibration larger than this. Therefore, by correcting the shutter vibration on the interchangeable lens 102 side as well, it is possible to correct a large blur caused by the shutter vibration that cannot be corrected only on the camera body 101 side.

As described above, according to the configuration of the present embodiment, the influence of shutter vibration can be reduced.
[Embodiment 2]
The configuration of the imaging system of this embodiment is the same as the configuration of the imaging system described with reference to FIG. In this embodiment, the points different from those in the first embodiment will be described, and detailed description of the common points will be omitted.

When the camera body has a focal plane type shutter, the influence of the shutter vibration exists at least twice during the front curtain running and the rear curtain running. In exposure, the shutter vibration is often affected by the front curtain running, but depending on the mechanical configuration of the camera body 101 and the interchangeable lens 102, it may be affected by the rear curtain running and the rear curtain charge vibration. To reduce the effect, it is necessary to add the unique shutter vibration correction data twice or more during the exposure. When all the shutter vibration correction data are added on the interchangeable lens 102 side, it is necessary to notify the interchangeable lens 102 of the timing information to be added from the camera body 101. However, there is a possibility that the amount of communication will increase and the communication timing will become complicated.

Hereinafter, the data format of the shutter vibration correction data added in the present embodiment will be described with reference to FIG. 9. FIG. 9 is a diagram showing a data format of the shutter vibration correction data of the present embodiment. FIG. 9 shows the exposure timing status generated by the camera body 101, the rear curtain charge reference timing grasped only by the camera body 101, and the shutter vibration correction data with the horizontal axis as time.

The shutter vibration correction data is composed of three types of information (start timing T1 of shutter vibration correction data starting from ON of the reference timing, end timing T2 of shutter vibration correction data, and information L indicating the size of shutter vibration correction data). expressed. In the present embodiment, the reference timings of the start timing T1 and the end timing T2 are different between the camera body 101 and the interchangeable lens 102. The start timing T1_C and the end timing T2_C of the camera-side shutter vibration correction data are information starting from the rear curtain charge reference timing. On the other hand, the start timing T1_L and the end timing T2_L of the lens-side shutter vibration correction data are information starting from ON of the exposure timing status. That is, the camera-side shutter vibration correction data corrects the vibration of the rear curtain charge, and the lens-side shutter vibration correction data corrects the vibration of the front curtain mechanical shutter.

Hereinafter, with reference to FIG. 10, a blur correction waveform when image blur correction is performed using shutter vibration correction data when a lens in a camera according to the present embodiment is attached will be described. FIG. 10 is a diagram showing an example of a blur correction waveform of the present embodiment. In FIG. 10, the horizontal axis represents time.

In the "camera + lens shake correction waveform" before adding the shutter vibration correction data, a large shake occurs due to the shutter vibration of the mechanical front curtain. In addition, at the end of the exposure period, relatively small blurring occurs due to the vibration of the rear curtain charge. As described above, since only the camera knows the rear curtain charge reference timing, the vibration of the front curtain mechanical shutter and the rear curtain charge can be obtained by adding the shutter vibration correction data to the drive signals on the lens side and the camera side, respectively. to correct. As a result, the influence of the shutter vibration during the traveling of the front curtain and the traveling of the rear curtain during the exposure period can be appropriately corrected, and the influence on the captured image can be appropriately reduced.

As described above, according to the configuration of the present embodiment, it is possible to reduce the influence of shutter vibrations having different timings.
[Embodiment 3]
The configuration of the imaging system of this embodiment is the same as the configuration of the imaging system described with reference to FIG. In this embodiment, the points different from those in the first embodiment will be described, and detailed description of the common points will be omitted.

In the first and second embodiments, it is premised that the camera body 101 and the interchangeable lens 102 correct the blur generated in the coaxial direction. Basically, the shutter vibration often affects the shutter traveling direction. However, the shutter vibration may affect the direction around the axis different from the shutter traveling direction. In particular, the imaging unit 112, which is a correction means on the camera body 101 side, is often driveable in the roll direction (optical axis rotation direction). When the image pickup system is affected by the shutter vibration in the roll direction, the image blur correction lens 127, which is a correction means on the interchangeable lens 102 side, cannot reduce the influence, so that the image pickup unit 112 needs to reduce the influence. Specifically, the shutter vibration correction data may be added to the drive signal in the roll axis direction with respect to the imaging unit 112.

In the present embodiment, when the camera body 101 and the interchangeable lens 102 separate the axes for adding the shutter vibration correction data, the camera body 101 adds the shutter vibration correction data to the drive signal in the roll direction. Not limited to this. As the correction axis for image blur correction, it is common to correct two axes, the yaw axis and the pitch axis, on the interchangeable lens 102 side, and five axes, the yaw axis, the pitch axis, the roll axis, the X axis, and the Y axis, on the camera body 101 side. Is the target. Shutter vibration correction data may be added to the drive signals in the pitch direction and the yaw direction of the interchangeable lens 102 and the camera body 101, respectively.

As described above, according to the configuration of the present embodiment, the influence of the shutter vibration in the roll direction can be reduced.

In each embodiment, the shutter vibration correction data is composed of time information from a certain reference timing and information indicating the size of the shutter vibration correction data, but the present invention is not limited thereto. It may be composed of frequency information of shutter vibration correction data and information indicating the size of shutter vibration correction data.
[Other Embodiments]
The present invention supplies a program that realizes one or more functions of the above-described embodiment to a system or device via a network or storage medium, and one or more processors in the computer of the system or device reads and executes the program. It can also be realized by the processing to be performed. It can also be realized by a circuit (for example, ASIC) that realizes one or more functions.

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

101 Camera body (imaging device)
102 Interchangeable lens (lens device)
107 Camera MPU (control means)
110 Focus plane shutter (shutter)
112 Imaging unit (first correction means)

Claims (20)

An imaging device to which a lens device can be attached
A movable first correction means for image blur correction,
It has a control means for controlling the first correction means.
The control means is an imaging device that corrects a drive signal for the first correction means by using first correction data for correcting an impact based on an operation related to a shutter. The imaging device according to claim 1, wherein the control means acquires the first correction data from the lens device. The imaging device according to claim 1 or 2, further comprising a storage means for storing the first correction data. The control means provides the lens device with second correction data for correcting the impact that affects the drive signal for the second correction means that is movable for image blur correction provided in the lens device. The imaging device according to any one of claims 1 to 3, wherein the imaging device is characterized by transmitting. The imaging device according to claim 4, wherein the second correction data is data determined according to the combination of the imaging device and the lens device. The imaging device according to claim 4 or 5, wherein the second correction data includes time information starting from a timing at which an exposure operation starts and information indicating a magnitude. The imaging device according to claim 5 or 6, wherein the second correction data includes frequency information starting from a timing at which an exposure operation starts and information indicating a magnitude. The imaging device according to any one of claims 4 to 7, wherein the first and second correction data include time information starting from timing information different from each other. The imaging device according to any one of claims 1 to 7, wherein the first correction data includes time information starting from a timing at which an exposure operation starts and information indicating a magnitude. The imaging device according to any one of claims 1 to 7, wherein the first correction data includes frequency information starting from a timing at which an exposure operation starts and information indicating a magnitude. Any one of claims 1 to 7, wherein the control means corrects the drive signal for the first correction means by using the first correction data when the front curtain shutter is driven. The imaging apparatus according to. The first correction data is any one of claims 1 to 8, wherein the first correction data includes time information starting from a timing at which an impact is generated based on an operation related to the rear curtain shutter, and information indicating the magnitude. The imaging apparatus according to. The first correction data is any one of claims 1 to 8, wherein the first correction data includes frequency information starting from a timing at which an impact is generated based on an operation related to the rear curtain shutter, and information indicating the magnitude. The imaging apparatus according to. The imaging device according to any one of claims 1 to 13, wherein the first correction data includes information indicating the magnitude of a component in a direction rotating about an optical axis. The imaging device according to any one of claims 1 to 14, wherein the first correction data is data determined according to a combination of the imaging device and the lens device. The control means according to claim 1 to 15, wherein when the tripod is not attached to the image pickup apparatus, the control means corrects the drive signal for the first correction means by using the first correction data. The imaging device according to any one item. A lens device that can be attached to an imaging device having a first movable correction means for image blur correction.
A second movable correction means for image blur correction,
It has a control means for controlling the second correction means, and has
The control means corrects the drive signal for the second correction means by using the second correction data for correcting the impact based on the operation related to the shutter, and affects the drive signal for the first correction means. A lens device, characterized in that a first correction data for correcting the impact is transmitted to the image pickup device. The imaging device according to any one of claims 1 to 16.
An imaging system comprising the lens device according to claim 17. It is a control method of an image pickup apparatus that includes a first correction means that can be attached to a lens device and can be moved for image blur correction, and a control means that controls the first correction means.
A control method comprising a step of correcting a drive signal for the first correction means by using a first correction data for correcting an impact based on an operation related to a shutter. A program comprising causing a computer to execute the control method according to claim 19.

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