JP2024092437A - Interchangeable lens, imaging device, and program - Google Patents

Abstract

An interchangeable lens is provided that makes it easy to control the position of a focus lens with high precision.
[Solution] The interchangeable lens is attachable to a camera body equipped with an imaging unit, and includes a focus lens driving unit that adjusts the position of the focus lens, and a controller. The controller receives a focus drive command including information indicating a reference zoom lens position and information indicating a target focus lens position from the camera body via a communication unit. A first resolution of the zoom lens position that can be managed by the controller is higher than a second resolution of the zoom lens position notified from the camera body. When the controller receives a focus drive command including information indicating a reference zoom lens position indicating that the zoom lens is stopped while the zoom lens is stopped, it controls the focus lens driving unit to move the focus lens to the target focus lens position.
[Selected Figure] Figure 1

Description

This disclosure relates to an interchangeable lens, an imaging device, and a program.

Patent document 1 discloses an imaging device that uses different calculation methods for the drive speed or drive position of the focus lens group when focusing and when not focusing, thereby improving the focusing accuracy during zoom operations.

JP 2022-063888 A

This disclosure provides an interchangeable lens, an imaging device, and a program that make it easier to control the position of the focus lens with precision.

An interchangeable lens according to one aspect of the present disclosure includes:
An interchangeable lens that can be attached to a camera body having an imaging unit that captures a subject image and generates image data,
a communication unit capable of communicating with the camera body;
A focus lens;
A zoom lens and
a focus lens driving unit for adjusting the position of the focus lens;
a controller that receives a focus drive command including information indicating a reference zoom lens position and information indicating a target focus lens position from the camera body via the communication unit, and controls the focus lens drive unit based on the focus drive command to adjust a position of the focus lens;
Equipped with
a first resolution of the position of the zoom lens that can be managed by the controller is higher than a second resolution of the position of the zoom lens that is notified by the camera body;
When the controller receives the focus drive command including information indicating the reference zoom lens position indicating the stop of the zoom lens while the zoom lens is stopped, the controller controls the focus lens drive unit to move the focus lens to the target focus lens position.

An imaging device according to one aspect of the present disclosure includes the interchangeable lens and the camera body.

A program according to one aspect of the present disclosure is a program executed by a controller of an interchangeable lens that can be attached to a camera body including an imaging unit that captures a subject image and generates image data, the program comprising:
The interchangeable lens is
a communication unit capable of communicating with the camera body;
A focus lens;
A zoom lens and
a focus lens driving unit for adjusting the position of the focus lens;
the controller is configured to receive a focus drive command including information indicating a reference zoom lens position and information indicating a target focus lens position from the camera body via the communication unit, and to control the focus lens drive unit based on the focus drive command to adjust a position of the focus lens;
a first resolution of the position of the zoom lens that can be managed by the controller is higher than a second resolution of the position of the zoom lens that is notified by the camera body;
The program causes the controller to execute a process of moving the focus lens to the target focus lens position when the controller receives the focus drive command including information indicating the reference zoom lens position indicating the stop of the zoom lens while the zoom lens is stopped.

This disclosure makes it easier to control the position of the focus lens with precision.

FIG. 1 is a block diagram showing a configuration of a digital camera according to an embodiment of the present disclosure. Flowchart showing focus drive processing of an interchangeable lens Flowchart showing focus drive processing accompanied by zoom movement FIG. 3 is a schematic diagram for explaining the movement of the focus lens in FIG. 2 ; FIG. 13 is a schematic diagram for explaining movement of a focus lens in a comparative example;

Below, the embodiments will be described with reference to the drawings as appropriate. However, more detailed explanation than necessary may be omitted. For example, detailed explanation of already well-known matters or duplicate explanation of substantially identical configurations may be omitted. This is to avoid the following explanation becoming unnecessarily redundant and to make it easier for those skilled in the art to understand.

The inventor(s) provide the accompanying drawings and the following description to enable those skilled in the art to fully understand the present disclosure, and do not intend for them to limit the subject matter described in the claims.

1. Configuration Fig. 1 is a block diagram showing the configuration of a digital camera 1 according to an embodiment of the present disclosure. The digital camera 1 includes a camera body 100 and an interchangeable lens 200 that is detachable from the camera body 100.

1-1. Camera Body The camera body 100 comprises an image sensor 110, a liquid crystal monitor 120, an operation unit 130, a camera controller 140, a body mount 150, a power source 160, and a card slot 170.

The camera controller 140 controls the overall operation of the digital camera 1 in response to instructions from the operation unit 130. The camera controller 140 realizes a predetermined function by executing a program stored in, for example, a flash memory 142 (an example of a storage device). For example, the camera controller 140 is composed of circuits such as a CPU, an MPU, and an FPGA. The camera controller 140 may be realized by a single such circuit, or may be realized by multiple circuits.

The camera controller 140 transmits a vertical synchronization signal to the timing generator 112. In parallel with this, the camera controller 140 generates a synchronization signal synchronized with the vertical synchronization signal, and transmits this synchronization signal to the lens controller 240 via the body mount 150 and the lens mount 250. The camera controller 140 uses the RAM 141 as a working memory when performing operations such as control and image processing.

The image sensor 110 is an element that captures an image of a subject incident through the interchangeable lens 200 and generates an image signal. The image sensor 110 is, for example, a CCD, a CMOS image sensor, or an NMOS image sensor. The AD converter 111 digitizes the image signal generated by the image sensor 110 and outputs image data. The digitized image data is input to the camera controller 140. The camera controller 140 performs a predetermined image processing on the image data. The predetermined image processing is, for example, gamma correction processing, white balance correction processing, scratch correction processing, YC conversion processing, electronic zoom processing, and JPEG compression processing. The image sensor 110 and the AD converter 111 are an example of an imaging unit of the present disclosure.

The image sensor 110 operates at a timing controlled by the timing generator 112. The image sensor 110 generates a through image or an image for recording. The through image is mainly a moving image, and is displayed on the LCD monitor 120 so that the user can decide the composition for capturing a still image.

The LCD monitor 120 displays images such as through-the-lens images and various information such as menu screens. Instead of the LCD monitor 120, the camera body 100 may be equipped with another type of display device, such as an organic EL display.

The operation unit 130 includes various operation members such as a release button for instructing the start of shooting, a mode dial for setting the shooting mode, and a power switch. The operation unit 130 may include a touch panel superimposed on the liquid crystal monitor 120.

The card slot 170 can accommodate a memory card 171, and controls the memory card 171 under control of the camera controller 140. The memory card 171 can store various types of image data. The camera controller 140 can also read the image data stored in the memory card 171 from the memory card 171.

The power supply 160 is a circuit that supplies power to each element of the digital camera 1.

The body mount 150 can be mechanically and electrically connected to the lens mount 250 of the interchangeable lens 200. The body mount 150 is an example of a communication unit, and can transmit and receive data between the body mount 150 and the interchangeable lens 200 via the lens mount 250.

For example, the body mount 150 transmits an exposure synchronization signal and a focus drive command (described later) received from the camera controller 140 to the lens controller 240 via the lens mount 250. The body mount 150 transmits other control signals received from the camera controller 140 to the lens controller 240 via the lens mount 250. The body mount 150 transmits signals received from the lens controller 240 to the camera controller 140 via the lens mount 250. The body mount 150 also supplies power from the power source 160 to the entire interchangeable lens 200 via the lens mount 250.

The interchangeable lens 200 is a lens unit including an optical system, a lens controller 240, and a lens mount 250. The optical system includes a zoom lens 210, an OIS (Optical Image Stabilizer) lens 220, a focus lens 230, and an aperture 260.

The zoom lens 210 is a lens for changing the magnification of a subject image formed by the optical system. The zoom lens 210 is composed of one or more lenses. The zoom lens 210 is driven by a zoom lens drive unit 211 or a zoom ring 213. The zoom lens drive unit 211 moves the zoom lens 210 along the optical axis direction of the optical system according to the control of the lens controller 240. The zoom lens drive unit 211 may include a zoom lever, a zoom drive switch, and an actuator or a motor. The zoom ring 213 is an operation unit that allows the user to perform zoom operations. The user can rotate the zoom ring 213 to manually (not electrically) move the zoom lens 210 and perform a zoom operation.

The zoom lens sensor 212 is an example of a detection unit that detects the movement or drive amount of the zoom lens 210 by the zoom lens drive unit 211. The zoom lens sensor 212 also detects the position of the zoom lens 210. By acquiring the detection result of the zoom lens sensor 212, the lens controller 240 can grasp the zoom magnification in the optical system, the position of the zoom lens 210, etc.

The focus lens 230 is a lens for changing the focus state of the subject image formed on the image sensor 110. The focus lens 230 is composed of one or more lenses. The focus lens 230 is driven by a focus lens driving unit 233.

The focus lens driving unit 233 includes an actuator or a motor, and moves the focus lens 230 along the optical axis of the optical system under the control of the lens controller 240. The focus lens driving unit 233 can be realized by a DC motor, a stepping motor, a servo motor, an ultrasonic motor, or the like.

The OIS lens 220 corrects blurring of the subject image formed by the optical system of the interchangeable lens 200 in the OIS function (a function that corrects camera shake by shifting the OIS lens 220). The OIS lens 220 reduces blurring of the subject image on the image sensor 110 by moving in a direction that offsets the shake of the digital camera 1. The OIS lens 220 is composed of one or more lenses. The OIS lens 220 is driven by an OIS driver 221.

Under control of the OIS processing unit 223, the OIS driving unit 221 shifts the OIS lens 220 in a plane perpendicular to the optical axis of the optical system. The OIS driving unit 221 can be realized, for example, by a magnet and a flat coil. The OIS sensor 222 is a position sensor that detects the position of the OIS lens 220 in a plane perpendicular to the optical axis of the optical system. The OIS sensor 222 can be realized, for example, by a magnet and a Hall element. The OIS processing unit 223 controls the OIS driving unit 221 based on the output of the OIS sensor 222 or the detection result of a blur detector such as a gyro sensor.

The aperture 260 adjusts the amount of light incident on the image sensor 110. The aperture 260 is driven by an aperture drive unit 262, and the size of its opening is controlled. The aperture drive unit 262 includes a motor or actuator.

The lens controller 240 controls the entire interchangeable lens 200, including the control of the zoom lens driver 211, the OIS driver 221, the OIS processor 223, the focus lens driver 233, and the aperture driver 262. For example, the lens controller 240 controls the zoom lens driver 211 based on a control signal from the camera controller 140, and moves the zoom lens 210. The lens controller 240 transmits and receives data to and from the camera controller 140 via the lens mount 250 and the body mount 150.

The lens controller 240 realizes a predetermined function by executing a program stored in, for example, a flash memory 242 (an example of a storage device). The lens controller 240 uses a RAM 241 as a work memory. The lens controller 240 is composed of circuits such as a CPU, an MPU, and an FPGA. The lens controller 240 may be realized by a single such circuit, or may be realized by multiple circuits.

The lens mount 250 can be mechanically and electrically connected to the body mount 150 of the camera body 100. The lens mount 250 is an example of a communication unit, and can transmit and receive data between the lens mount 250 and the camera body 100 via the body mount 150.

2. Operation A description will now be given of the operation of the interchangeable lens 200 configured as above. Fig. 2 is a flowchart showing the focus drive process of the interchangeable lens 200. This process is executed by the lens controller 240 of the interchangeable lens 200, for example, at a predetermined cycle.

First, the lens controller 240 determines whether or not it has received a focus drive command from the camera body 100 (S1). The focus drive command is a command output from the camera controller 140. The lens controller 240 acquires the reference zoom lens position Zib and the target focus lens position Ftb included in the focus drive command (S2). The reference zoom lens position Zib is the position of the zoom lens 210 recognized by the camera controller 140 when determining the target focus lens position Ftb or when outputting the focus drive command.

Next, the lens controller 240 determines whether the zoom lens 210 is stopped (S3). For example, the lens controller 240 determines that the zoom lens 210 is stopped when a state in which the amount of change in the position of the zoom lens 210 detected by the zoom lens sensor 212 is equal to or less than a predetermined value continues for a predetermined time. Alternatively, the lens controller 240 may determine that the zoom lens 210 is stopped when a state in which the zoom lens driving unit 211 is stopped or the zoom lens driving unit 211 is not driving the zoom lens 210 continues for a predetermined time. A state in which the zoom lens driving unit 211 is stopped is, for example, a state in which the zoom motor is stopped and the zoom drive switch is not operated.

When the lens controller 240 determines that the zoom lens 210 is stopped (Yes in S3), it rounds the position (first position detection value) Zi of the zoom lens 210 detected by the zoom lens sensor 212 to a value Zi' (second position detection value) received (notified) from the camera body 100 (S4). The first position detection value Zi is an example of a position of the zoom lens 210 that can be managed by the lens controller 240.

The resolution (first resolution) Ri of the first position detection value Zi that can be managed by the lens controller 240 is higher than the resolution (second resolution) Rib of the second position detection value Zi' notified to the lens controller 240 from the camera body 100. The second resolution Rib complies with a communication standard that specifies the communication of a focus drive command including a reference zoom lens position Zib (sometimes referred to in this specification as a "focus drive command with a specified zoom position") between the camera body 100 and the lens controller 240.

Here, the position resolution is the minimum distance between two points that the device can distinguish. The first resolution Ri is the minimum distance between two positions of the zoom lens 210 that the lens controller 240 or the zoom lens sensor 212 can distinguish. The second resolution Rib is the minimum distance between two positions of the zoom lens 210 that the camera controller 140 can distinguish.

The first resolution Ri is smaller (shorter) than the second resolution Rib. In this specification, this is expressed as the first resolution Ri being higher (better) than the second resolution Rib. A difference between the first resolution Ri and the second resolution Rib can arise, for example, due to the following circumstances. That is, after the resolution that can be specified by the camera body or interchangeable lens is established in the communication standard, the performance of the interchangeable lens is improved, and the resolution that the lens controller can handle can be improved beyond the resolution of the communication standard.

The rounding process in step S4 is a process in which, for example, when the first position detection value Zi is between two values separated by the second resolution Rib notified from the camera body 100 (for example, between Zi' and Zi'+Rib), the value closest to the first position detection value Zi is output. Alternatively, the rounding process may be a round-down process in which the smaller of the two values is output, or a round-up process in which the larger of the two values is output.

Next, the lens controller 240 determines whether the second position detection value Zi' obtained in step S4 is equal to the reference zoom lens position Zib obtained in step S2 (S5).

When Zi' = Zib in step S5 (Yes in S5), the lens controller 240 moves the focus lens 230 to the target focus lens position Ftb (S6). In this way, the lens controller 240 can move the focus lens 230 to the intended target focus lens position Ftb, thereby improving the focusing accuracy.

If Zi' = Zib in step S5, the position of the zoom lens 210 does not change, so the focus drive command can be said to indicate that the zoom lens 210 is stopped. Therefore, Zi' = Zib in step S5 (Yes in S5) is an example of a case where, while the zoom lens 210 is stopped, the lens controller 240 receives a focus drive command that includes information indicating the reference zoom lens position Zib, which indicates that the zoom lens 210 is stopped.

When Zi' ≠ Zib in step S5 (No in S5), the lens controller 240 executes focus drive processing S7 involving zoom movement.

Figure 3 is a flowchart showing the focus drive process S7 involving zoom movement.

In FIG. 3, the lens controller 240 determines the target focusing distance D corresponding to the combination of the reference zoom lens position Zib and the target focus lens position Ftb (S71).

The lens controller 240, for example, determines the target focusing distance D corresponding to the reference zoom lens position Zib and the target focus lens position Ftb by referring to relationship information that associates the position of the zoom lens 210, the position of the focus lens 230, and the target focusing distance D. Such relationship information is pre-stored in, for example, the flash memory 242.

Next, the lens controller 240 determines the focus lens position Fe corresponding to the target focusing distance D (S72). For example, the lens controller 240 determines the focus lens position Fe corresponding to the reference zoom lens position Ze and the target focusing distance D by referring to the relationship information.

On the other hand, if a zoom operation is performed while the focus lens 230 is moving, the reference zoom lens position Ze is a position obtained by adding the amount of movement of the zoom lens 210 due to the rotational operation of the zoom ring 213 or the zoom drive command to the reference zoom lens position Zib. Therefore, the target focus lens position Fe may also change from the initial target focus lens position Ftb.

Next, the lens controller 240 moves the focus lens 230 to the focus lens position Fe obtained in step S72 (S73).

Figure 4 is a schematic diagram for explaining the movement of the focus lens 230 in step S6 in Figure 2. The horizontal axis of the graph in Figure 4 indicates the position of the zoom lens 210, and the vertical axis indicates the position of the focus lens 230. The graph in Figure 4 shows lines connecting points of the same focal distance with solid and dashed lines.

The dotted lines extending vertically in FIG. 4 indicate the positions of the zoom lens 210 that can be managed by the lens controller 240. Therefore, the distance between adjacent dotted lines is equal to the resolution (first resolution) Ri of the position detection value of the zoom lens 210 that can be managed by the lens controller 240.

The dashed lines extending vertically in FIG. 4 indicate the position of the zoom lens 210 notified by the camera body 100. Therefore, the distance between adjacent dashed lines is equal to the resolution (second resolution) Rib of the position of the zoom lens 210 notified by the camera body 100.

Figure 4 shows an example in which the current position of the focus lens 230 is Fi, and the current position of the zoom lens 210 detected by the zoom lens sensor 212 is Zi. That is, the starting point of the arrow in Figure 4 indicates the coordinates (Zi, Fi). Since the second resolution Rib of the camera body 100 is lower than the first resolution Ri of the lens controller 240, in the example of Figure 4, the camera body 100 recognizes that the current position of the zoom lens 210 is Zib.

The camera body 100 sends a focus drive command including a reference zoom lens position and a target focus lens position Ftb to the lens controller 240. In the example of FIG. 4, the reference zoom lens position is Zib, and zooming is stopped (Yes in S3). In the example of FIG. 4, the value Zi' obtained by rounding the position Zi so that it can be used for communication with the camera body 100 is equal to Zib (Yes in S5). Therefore, as shown by the arrow in FIG. 4, the lens controller 240 moves the focus lens 230 to the target focus lens position Ftb (S6).

By performing the above operations, the lens controller 240 can move the focus lens 230 to the intended target focus lens position Ftb.

3. Comparative Example In contrast, in a comparative example in which the operation of moving focus lens 230 to target focus lens position Ftb is not performed when a predetermined condition (Yes in S3 and Yes in S5) is satisfied, focus lens 230 may not move to the intended target focus lens position Ftb. Below, the problems with such a comparative example will be described.

In the comparative example, even if the above-mentioned predetermined condition is satisfied, the same process as step S71 is performed to determine the target focusing distance D based on the reference zoom lens position Zib and the target focus lens position Ftb. Then, in the comparative example, the lens controller determines the focus lens position corresponding to the combination of the zoom lens position detected by the zoom lens sensor and the target focusing distance D by referring to the relationship information.

Figure 5 is a schematic diagram for explaining the movement of the focus lens in a comparative example. The current focus lens position is Fi, and the current zoom lens position detected by the zoom lens sensor is Zi. Meanwhile, the camera body recognizes that the current zoom lens position is Zib. The camera body sends a focus drive command including the reference zoom lens position Zib and the target focus lens position Ftb to the lens controller. That is, the focus drive command is interpreted as an instruction to move the positions of the zoom lens and focus lens along the arrow A1.

The lens controller determines the target focus distance D based on the reference zoom lens position Zib and the target focus lens position Ftb. In the example of FIG. 5, the lens controller determines that the target focus distance D is 1.9 m.

However, because the position of the zoom lens recognized by the lens controller is Zi (≠ Zib), the lens controller of the comparative example determines the position of the focus lens corresponding to the combination of Zi and the target focus distance D (1.9 m). Therefore, the lens controller of the comparative example attempts to drive the focus lens toward position Ft, which is on the dashed line indicating a focus distance of 1.9 m. As a result, the lens controller of the comparative example moves the positions of the zoom lens and focus lens along arrow A2.

As such, in the comparative example, a difference occurs between the position Ftb of the focus lens after movement intended by the camera body and the position Ft of the focus lens after movement moved by the lens controller.

In contrast, as described above, the interchangeable lens 200 according to this embodiment can move the focus lens 230 to the intended target focus lens position Ftb, thereby improving focusing accuracy.

4. Effects, etc. As described above, the interchangeable lens 200 according to this embodiment can be attached to a camera body 100 that includes an image sensor 110 that captures an image of a subject and generates image data, and an AD converter 111 (an example of an imaging unit). The interchangeable lens 200 includes a lens mount 250 (an example of a communication unit) that can communicate with the camera body 100, a focus lens 230, a zoom lens 210, a focus lens driving unit 233 that adjusts the position of the focus lens 230, and a lens controller 240. The lens controller 240 receives a focus drive command including information indicating a reference zoom lens position and information indicating a target focus lens position from the camera body 100 via the lens mount 250. The lens controller 240 controls the focus lens driving unit 233 based on the focus drive command to adjust the position of the focus lens 230. The first resolution Ri of the position of the zoom lens 210 that the lens controller 240 can manage is higher than the second resolution Rib of the position of the zoom lens 210 notified from the camera body 100. When the lens controller 240 receives a focus drive command including information indicating a reference zoom lens position showing that the zoom lens 210 is stopped (Yes in S5) while the zoom lens 210 is stopped (Yes in S3), it controls the focus lens drive unit 233 to move the focus lens 230 to the target focus lens position.

This configuration allows the interchangeable lens 200 to move the focus lens 230 to the intended target focus lens position, improving focusing accuracy.

The lens controller 240 may further include a zoom lens sensor 212 (an example of a detection unit) that detects the position of the zoom lens 210. The lens controller 240 may determine that it has received a focus drive command that includes information indicating a reference zoom lens position that indicates the stop of the zoom lens 210 when the reference zoom lens position included in the focus drive command is equal to a second position detection value obtained by rounding the first position detection value of the zoom lens 210 detected by the detection unit to a value that can be used for communication with the camera body 100. With this configuration, the interchangeable lens 200 can move the focus lens 230 to the intended target focus lens position.

The lens controller 240 may further include a flash memory 242 (an example of a storage device) that stores relationship information that associates the position of the zoom lens 210, the position of the focus lens 230, and the focal distance. When the zoom lens 210 is not stopped, or when the information indicating the reference zoom lens position included in the focus drive command does not indicate that the zoom lens 210 is stopped, the lens controller 240 may execute a focus drive process S7 involving zoom movement. The focus drive process S7 includes a step (S71) of obtaining a focal distance corresponding to a combination of the reference zoom lens position and the target focus lens position by referring to the relationship information, a step (S72) of obtaining a position of the focus lens 230 corresponding to the focal distance by referring to the relationship information, and a step (S73) of moving the focus lens to the obtained position of the focus lens 230. With this configuration, the interchangeable lens 200 can move the focus lens 230 to the intended focus lens position.

5. Other embodiments As described above, the embodiments have been described as examples of the technology in the present disclosure. However, the technology in the present disclosure is not limited to this, and can be applied to embodiments in which modifications, substitutions, additions, omissions, etc. are appropriately performed. In addition, it is also possible to combine the components described in the above embodiments to form new embodiments. Therefore, other embodiments will be exemplified below.

In the above embodiment, a digital camera having a camera body and a detachable interchangeable lens has been described as an example of an imaging device, but the imaging device may be an integrated type in which the body and lens are integrated. Examples of integrated imaging devices are electronic devices such as a digital camera in which the body and lens are integrated, a smartphone with imaging function, and a tablet terminal.

6. Examples of Aspects The following describes examples of aspects of the present disclosure.

<Aspect 1>
An interchangeable lens that can be attached to a camera body having an imaging unit that captures a subject image and generates image data,
a communication unit capable of communicating with the camera body;
A focus lens;
A zoom lens and
a focus lens driving unit for adjusting the position of the focus lens;
a controller that receives a focus drive command including information indicating a reference zoom lens position and information indicating a target focus lens position from the camera body via the communication unit, and controls the focus lens drive unit based on the focus drive command to adjust the position of the focus lens;
Equipped with
a first resolution of the position of the zoom lens that can be managed by the controller is higher than a second resolution of the position of the zoom lens that is notified by the camera body;
when the controller receives the focus drive command including information indicating the reference zoom lens position indicating the stop of the zoom lens while the zoom lens is stopped, the controller controls the focus lens drive unit to move the focus lens to the target focus lens position.
interchangeable lens.

<Aspect 2>
A detection unit that detects a position of the zoom lens is further provided.
the controller determines that the focus drive command including information indicating the reference zoom lens position indicating the stop of the zoom lens has been received when the reference zoom lens position included in the focus drive command is equal to a second position detection value obtained by rounding a first position detection value of the zoom lens detected by the detection unit to a value usable for communication with the camera body;
2. The interchangeable lens according to claim 1.

<Aspect 3>
a storage device that stores relationship information that associates a position of the zoom lens, a position of the focus lens, and a focal distance;
When the zoom lens is not stopped, or when the information indicating the reference zoom lens position included in the focus drive command does not indicate that the zoom lens is stopped, the controller:
By referring to the relationship information, the focal distance corresponding to the combination of the reference zoom lens position and the target focus lens position is obtained;
By referring to the relationship information, a position of the focus lens corresponding to the focal distance is obtained;
moving the focus lens to the determined position of the focus lens;
3. The interchangeable lens according to aspect 1 or 2.

<Aspect 4>
An imaging device comprising: the interchangeable lens according to any one of aspects 1 to 3; and the camera body.

<Aspect 5>
A program executed by a controller of an interchangeable lens that can be attached to a camera body having an imaging unit that captures a subject image and generates image data,
The interchangeable lens is
a communication unit capable of communicating with the camera body;
A focus lens;
A zoom lens and
a focus lens driving unit for adjusting the position of the focus lens;
the controller is configured to receive a focus drive command including information indicating a reference zoom lens position and information indicating a target focus lens position from the camera body via the communication unit, and to control the focus lens drive unit based on the focus drive command to adjust a position of the focus lens;
a first resolution of the position of the zoom lens that can be managed by the controller is higher than a second resolution of the position of the zoom lens that is notified by the camera body;
the program causes the controller to execute a process of moving the focus lens to the target focus lens position when the controller receives the focus drive command including information indicating the reference zoom lens position indicating the stop of the zoom lens while the zoom lens is stopped.
program.

This disclosure is applicable to imaging devices.

1 Digital camera 100 Camera body 110 Image sensor 111 AD converter 112 Timing generator 120 Liquid crystal monitor 130 Operation unit 140 Camera controller 142 Flash memory 150 Body mount 160 Power supply 170 Card slot 171 Memory card 200 Interchangeable lens 210 Zoom lens 211 Zoom lens driving unit 212 Zoom lens sensor 213 Zoom ring 220 OIS lens 221 OIS driving unit 222 OIS sensor 223 OIS processing unit 230 Focus lens 233 Focus lens driving unit 240 Lens controller 242 Flash memory 250 Lens mount 262 Driving unit

The present disclosure provides an interchangeable lens, an imaging device, and a program that can move a focus lens to a focus lens position required by a camera body while a zoom lens is stopped .

According to the present disclosure, while the zoom lens is stopped, the focus lens can be moved to a focus lens position required by the camera body .

Claims (5)

An interchangeable lens that can be attached to a camera body having an imaging unit that captures a subject image and generates image data,
a communication unit capable of communicating with the camera body;
A focus lens;
A zoom lens and
a focus lens driving unit for adjusting the position of the focus lens;
a controller that receives a focus drive command including information indicating a reference zoom lens position and information indicating a target focus lens position from the camera body via the communication unit, and controls the focus lens drive unit based on the focus drive command to adjust a position of the focus lens;
Equipped with
a first resolution of the position of the zoom lens that can be managed by the controller is higher than a second resolution of the position of the zoom lens that is notified by the camera body;
when the controller receives the focus drive command including information indicating the reference zoom lens position indicating the stop of the zoom lens while the zoom lens is stopped, the controller controls the focus lens drive unit to move the focus lens to the target focus lens position.
interchangeable lens. A detection unit that detects a position of the zoom lens is further provided.
2. The interchangeable lens of claim 1, wherein the controller determines that the focus drive command including information indicating the reference zoom lens position indicating a stop of the zoom lens has been received when the reference zoom lens position included in the focus drive command is equal to a second position detection value obtained by rounding a first position detection value of the zoom lens detected by the detection unit to a value that can be used for communication with the camera body. a storage device that stores relationship information that associates a position of the zoom lens, a position of the focus lens, and a focal distance;
When the zoom lens is not stopped, or when the information indicating the reference zoom lens position included in the focus drive command does not indicate the stop of the zoom lens,
By referring to the relationship information, the focal distance corresponding to the combination of the reference zoom lens position and the target focus lens position is obtained;
By referring to the relationship information, a position of the focus lens corresponding to the focal distance is obtained;
moving the focus lens to the determined position of the focus lens;
The interchangeable lens according to claim 1 or 2. An imaging device comprising the interchangeable lens according to claim 1 or 2 and the camera body. A program executed by a controller of an interchangeable lens that can be attached to a camera body having an imaging unit that captures a subject image and generates image data,
The interchangeable lens is
a communication unit capable of communicating with the camera body;
A focus lens;
A zoom lens and
a focus lens driving unit for adjusting the position of the focus lens;
the controller is configured to receive a focus drive command including information indicating a reference zoom lens position and information indicating a target focus lens position from the camera body via the communication unit, and to control the focus lens drive unit based on the focus drive command to adjust a position of the focus lens;
a first resolution of the position of the zoom lens that can be managed by the controller is higher than a second resolution of the position of the zoom lens that is notified by the camera body;
the program causes the controller to execute a process of moving the focus lens to the target focus lens position when the controller receives the focus drive command including information indicating the reference zoom lens position indicating the stop of the zoom lens while the zoom lens is stopped.
program.