JP2008176242A - Focusing device, optical apparatus, lens barrel and focusing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a focusing device capable of accurately focusing even when shifting to a manual focusing control, and to provide an optical apparatus, a lens barrel and a focusing method. <P>SOLUTION: The focusing device is provided with: an optical system (21) including a focus lens group (22) for focusing; a focusing part (23) for focusing the focus lens group (22) in reply to a manual operation; a focus detecting part (16) for detecting the focusing state of the optical system (21); a driving part (30) for focusing the focus lens group (22) in accordance with the focusing state of the optical system (21); and a control part (27) for performing the focusing control of the focus lens group (22) through the driving part when the focusing state is shifted to a nearly focused state by the focusing part (23). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a focus adjustment device, an optical apparatus, a lens barrel, and a focus adjustment method for adjusting the focus of an optical system.

Conventionally, there has been a camera that shifts from autofocus control to manual focus control by operating an operation member for manual focus control in a state of performing autofocus control. (For example, patent document 1).
JP-A-2-253214

With conventional cameras, it is possible to focus on the target subject by shifting to manual focus control when the subject is difficult to focus with autofocus. However, the focus adjustment accuracy depends on the skill of the photographer. However, there is a problem that accurate focusing control cannot be achieved.
An object of the present invention is to provide a focus adjustment device, an optical apparatus, a lens barrel, and a focus adjustment method capable of performing an accurate focusing operation even when shifting to manual focus control.

The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to the Example of this invention is attached | subjected and demonstrated, it is not limited to this.
The invention of claim 1 includes an optical system (21) having a focus lens group (22) for focus adjustment, a focus adjustment section (23) for adjusting the focus lens group in accordance with a manual operation, and the optical system. The focus adjustment state is substantially matched by the focus detection unit (16) for detecting the focus adjustment state of the lens, the drive unit (30) for adjusting the focus of the focus lens group according to the focus adjustment state, and the focus adjustment unit. And a control unit (27) that performs focus adjustment control of the focus lens group by the driving unit when the focus unit is in a focus state.

According to a second aspect of the present invention, in the focus adjustment apparatus according to the first aspect, the control unit (27) is configured so that the focus adjustment state is substantially in focus by the focus adjustment unit (23). The focus adjustment device controls the drive unit (30) based on a focus adjustment amount by the focus adjustment unit.
According to a third aspect of the present invention, in the focus adjustment device according to the first or second aspect, the focus adjustment unit (23) and the drive unit (30) are configured to connect the focus lens via a differential mechanism (31). A focusing device characterized in that the group (22) is driven.
According to a fourth aspect of the present invention, in the focus adjustment device according to any one of the first to third aspects, the operation amount detection unit (24) for detecting an operation amount of the focus adjustment unit (23) is provided. The control unit (27) prohibits the control by the driving unit (30) when the operation amount per unit time by the operation amount detection unit is larger than a predetermined amount. Device.

  A fifth aspect of the present invention is an optical instrument comprising the focus adjustment device according to any one of the first to fourth aspects.

  According to a sixth aspect of the present invention, in the optical device according to the fifth aspect, the optical device according to the fifth aspect further includes a detection unit (33) for detecting a composition change amount of the image by the optical system, and the control unit (27) is a composition by the detection unit. When the change amount is larger than a predetermined amount, the optical device is characterized in that the control by the drive unit (30) is prohibited.

  The invention of claim 7 includes an optical system (21) having a focus lens group (22) for focus adjustment, a focus adjustment section (23) for adjusting the focus lens group in response to a manual operation, and the optical system. A drive unit (30) that adjusts the focus lens group according to the focus adjustment state, and when the focus adjustment state is substantially in focus by the focus adjustment unit, the drive unit causes the focus lens to be in focus. And a control unit (27) that performs focus adjustment control of the group.

The invention according to claim 8 is the lens barrel according to claim 7, further comprising a shake detection unit (33) for detecting shake applied to the lens barrel, wherein the control unit (27) is controlled by the shake detection unit. When the detected shake is larger than a predetermined value, the lens barrel is characterized in that the control by the drive unit (30) is prohibited.
The invention of claim 9 is a focus adjustment method for adjusting the focus of an optical system (21) having a focus lens group (22) movable by manual operation and a driving source, and the focus lens group is moved by the manual operation. And a focus adjustment state of the optical system is detected, and the focus lens group is controlled by the drive source when the focus adjustment state is almost in focus. is there.

  According to the present invention, it is possible to provide a focus adjustment device, an optical apparatus, a lens barrel, and a focus adjustment method capable of performing an accurate focusing operation even when shifting to manual focus control.

[First Embodiment]
Hereinafter, the present invention will be described in more detail with reference to the drawings and the like.
FIG. 1 is a block diagram of a camera system 1 according to the first embodiment.
As shown in FIG. 1, the camera system 1 is a system having an autofocus (hereinafter referred to as “AF”) function, and can be attached to and detached from a camera body 10 that is a digital single-lens reflex camera and a bayonet connection or the like. And an interchangeable lens 20 attached to the lens. The camera body 10 and the interchangeable lens 20 are electrically connected by electrical contacts (not shown) when the interchangeable lens 20 is mounted, and can transmit signals to each other.

The camera body 10 includes a mirror 11, a screen 12, a penta roof prism 13, an image sensor 14, a sub mirror 15, a defocus amount detector 16, and a body side control unit 17.
The mirror 11 is a quick return mirror that reflects and guides the light beam from the interchangeable lens 20 toward the penta roof prism 13 when observing a subject, and guides the light beam away from the photographing optical path toward the image sensor 14 during exposure. A part of the mirror 11 is a half mirror, and guides the light beam transmitted from the interchangeable lens 20 through the mirror 11 toward the sub mirror 15.
The screen 12 is a screen for forming the light flux of the subject from the mirror 11, and the formed subject image is converted into an erect image by the penta roof prism 13 and can be observed by the photographer. On the screen 12, distance measuring point indexes 12a to 12k (described later) corresponding to the distance measuring points are provided. The distance measuring point indexes 12a to 12k on the screen 12 are illuminated by using LEDs or the like in colors corresponding to “front pin”, “rear pin”, “substantially in focus”, “in focus”, and “incapable distance measurement”. The distance measurement information obtained from the defocus amount detector 16 is transmitted to the photographer.

The image sensor 14 converts a subject image formed at the time of exposure into an electric signal, and is a photoelectric conversion element such as a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS).
The sub mirror 15 is a member for reflecting the light transmitted through the half mirror portion of the mirror 11 and guiding it in the direction of the defocus amount detector 16.
The defocus amount detector 16 is a focus detection module for detecting the focus adjustment state of the photographing optical system 21 to be described later based on the subject light beam guided by the mirror 11 and the sub mirror 15. The defocus amount detector 16 detects the defocus amount of the photographing optical system 21 by, for example, a phase difference detection method using an image sensor array.
The body-side control unit 17 is a control unit for comprehensively controlling the camera body 10 and includes a CPU (Central Processing Unit) and the like. Details of the operation of the body side control unit 17 will be described later.

The interchangeable lens 20 includes a photographing optical system 21, an MF (manual focus) operation ring 23, an MF operation ring rotation amount detector 24, a focus position detector 25, a zoom position detector 26, and a lens side control unit 27. A motor driver 29, an AF motor 30, a differential mechanism 31, a focusing mechanism 32, and a shake sensor 33.
The photographing optical system 21 includes a zoom lens group (not shown) in addition to a focus lens group 22 for focus adjustment (a single lens is simply shown in FIG. 1). The focus lens group 22 and the zoom lens group are accommodated in the interchangeable lens 20 so as to be movable in a direction along the optical axis O (hereinafter referred to as “optical axis direction”).
The MF operation ring 23 is a cylindrical member rotatably provided on the outer peripheral portion of the interchangeable lens 20, and a focus lens group via a differential mechanism 31 and a focusing mechanism 32 according to a manual operation of the photographer. 22 is moved in the optical axis direction to adjust the focus of the photographing optical system 21.
The MF operation ring rotation amount detector 24 is a sensor for detecting the operation amount of the MF operation ring 23 by detecting the rotation angle and direction of the MF operation ring 23.

  The focus position detector 25 is a sensor for detecting the position of the focus lens group 22 in the optical axis direction. The zoom position detector 26 is a sensor for obtaining the focal length of the photographing optical system 21 by detecting the position of the zoom lens group in the optical axis direction.

The lens-side control unit 27 is a control unit for comprehensively controlling the interchangeable lens 20 and includes a CPU and the like. The lens side control unit 27 has a motor rotation angle calculator 28.
The motor rotation angle calculator 28 is an arithmetic processing unit for calculating the rotation angle of the AF motor 30 based on the aperture value information set by the focus position detector 25, the defocus amount detector 16, and the camera body 10. is there. The motor rotation angle calculator 28 confirms the position of the focus lens group 22 according to the output of the focus position detector 25. Further, the motor rotation angle calculator 28 calculates the rotation angle of the AF motor 30 necessary for moving the focus lens group 22 to the in-focus position according to the output of the defocus amount of the defocus amount detector 16. To do.
In addition to the normal AF control mode, the lens-side control unit 27 performs the focusing operation by AF after the focus adjustment state is substantially in focus by the MF operation ring 23, as will be described later. A control mode is used to control the focus lens group 22 to the in-focus position. Hereinafter, this control mode is referred to as a “first mode”.

The motor driver 29 is a driver IC for driving the AF motor 30.
The AF motor 30 is, for example, an ultrasonic motor or a DC motor for moving the focus lens group 22 in the optical axis direction. The AF motor 30 is connected to a focusing mechanism 32 via a differential mechanism 31. The MF operation ring 23 is also connected to the focusing mechanism 32 via the differential mechanism 31. That is, the focus lens group 22 is driven by a differential between the driving amount by the AF motor 30 and the driving amount by the MF operation ring 23.

The focusing mechanism 32 is composed of, for example, a cam cylinder, a rectilinear cylinder, and the like, and a focus lens group held in a lens frame (not shown) by transmitting driving force from the MF operation ring 23 and the AF motor 30. 22 is moved in the optical axis direction.
The shake sensor 33 is an angular velocity sensor that detects an angular velocity applied to the interchangeable lens 20 in order to measure the shake of the interchangeable lens 20 (the photographing optical system 21). The shake sensor 33 is usually used to detect the shake of the interchangeable lens 20 and drive a specific lens to correct image blur caused by the shake. In the present embodiment, in addition to this, the imaging optical system 21 is used. Is used to detect the composition change amount of the image. That is, even when the camera system 1 is shaken because the photographer changes the composition, the shake amount of the camera system 1 is detected by the shake sensor 33, and the lens-side control unit 27 detects the composition change amount. Can be determined.

FIG. 2 is a flowchart showing the operation of the camera system 1 when the first mode is selected. FIGS. 3 and 4 are diagrams showing a display example and composition example of the finder of the camera system 1.
First, in step (hereinafter referred to as “S”) 1, the photographer operates the mode switching operation unit (not shown) of the camera body 10 or the interchangeable lens 20 to select the first mode, thereby starting the processing. Is done. When the photographer operates a ranging point switching operation unit (not shown) to select a ranging point corresponding to the subject, the body side control unit 17 recognizes the ranging point. Here, as shown in FIG. 3, a case will be described in which the focus detection point index 12a is selected from the focus detection point indexes 12a to 12k, and the focus control is performed on the face 41a of the person 41 in the shooting screen. .
In S <b> 2, when the photographer operates the MF operation ring 23 so that the face 41 a is in focus based on the state of the image formed on the screen 12, the MF operation ring rotation amount detector 24 moves the MF operation ring. 23 is detected, and a signal is output to the body side controller 17. In response to this, the body-side control unit 17 determines that the MF operation ring 23 is rotating (S2: YES), and proceeds to S3. On the other hand, when the MF operation ring 23 is not operated (S2: NO), the body side control unit 17 waits for an output from the MF operation ring rotation amount detector 24.

In S3, the body side control unit 17 detects the defocus amount by the defocus amount detector 16, proceeds to S4, turns on the focus display in the finder, and the photographer changes the focus adjustment state based on the defocus amount. Make it visible.
In S <b> 5, the body side control unit 17 determines whether or not the defocus amount with respect to the distance measuring point 12 a is within a range that can be regarded as being almost in focus by the photographer operating the MF operation ring 23. If the body-side control unit 17 determines that the defocus amount is within the range that can be regarded as being substantially in focus (S5: YES), the distance measurement corresponding to the fact that the distance measurement point 12a can be regarded as being substantially in focus. After the information is displayed on the screen 12, the process proceeds to S6. On the other hand, the body side control part 17 repeats the process from S2, when it is not in the range which can be regarded as focusing substantially (S5: NO). Here, the range that can be regarded as being substantially in focus refers to a focus state that has a larger defocus amount than the range that the body side control unit 17 determines to be in focus but is within a predetermined range.

In S6, the lens side control unit 27 resets the swing amount of the camera system 1 determined from the output of the shake sensor 33, and sets the composition in this state to the reference composition.
In S <b> 7, the lens-side control unit 27 determines whether the rotation speed of the MF operation ring 23 is within a specified speed based on the output of the MF operation ring rotation amount detector 24. For example, when the subject to be focused on is to be changed from the face 41a to the sky behind, the MF operation ring 23 may be rotated in the infinity direction at a high speed. In response to this, the lens-side control unit 27 determines from the output of the MF operation ring rotation amount detector 24 that the rotation speed of the MF operation ring 23 is not within the specified speed (S7: NO), and proceeds to S20. The processing from S2 is repeated after the focusing operation by AF for a predetermined time is prohibited. As described above, when the operation amount per unit time based on the output of the MF operation ring rotation amount detector 24 is larger than the predetermined amount, the camera system 1 prohibits the focusing operation by AF. Accordingly, the photographer can easily perform an operation of focusing on another subject from a state in which the focus is adjusted to the specific subject.
On the other hand, when the rotational speed of the MF operation ring 23 is within the specified speed (S7: YES), the lens side control unit 27 proceeds to S8.

In S8, when the angular velocity based on the output of the shake sensor 33 exceeds a predetermined value, the lens side control unit 27, that is, the swing amount of the camera system 1 deviates from within the specified range, and the composition change amount is larger than the predetermined amount. When it is determined that the value is large (S8: NO), the process proceeds to S30, the focusing operation by AF is prohibited, and then the processing from S2 is repeated. As described above, by using the shake sensor 33 as a sensor for detecting the composition change amount, the camera system 1 can easily perform an operation associated with the composition change.
On the other hand, when the swing amount of the camera system 1 is within the specified range (S8: YES), the lens side control unit 27 proceeds to S9.

  In S9, when the lens-side control unit 27 determines that the defocus amount has not changed rapidly based on the output of the defocus amount detector 16 (S9: NO), the process proceeds to S10.

  In S10, the lens side control unit 27 starts the focusing operation by AF. Here, the focusing operation by AF is an operation in which the lens-side control unit 27 determines the focus adjustment state based on the output of the defocus amount detector 16 and controls the AF motor 30.

As described above, the lens side control unit 27 detects the MF operation ring speed (S7) after the defocus amount enters the range where it can be regarded as the in-focus range by the operation of the MF operation ring 23 (S5: YES). After the process, the process proceeds to S10, and the focus lens group 22 is moved by the focusing operation by AF. Thus, the camera system 1 can perform an accurate focusing operation with assistance that effectively uses the focusing operation by AF even when focusing is performed with manual focus.
After S10, the lens side control unit 27 repeats the processing from S7 until a release button (not shown) is operated and a release signal instructing exposure is output.

On the other hand, in S9, when the lens-side control unit 27 determines that the defocus amount has suddenly deviated from the range that can be regarded as being substantially in focus (S9: YES), after proceeding to S40 and prohibiting the focusing operation by AF for a certain time. , The process from S7 is repeated.
For example, as shown in FIG. 4, when the focused state is obtained with respect to the stamen portion 42a of the flower 42 at the position of the distance measuring point index 12b, the leaves 43 are within the distance measuring point index 12b due to wind or the like. When it comes in, the defocus amount suddenly increases. In this case, the lens side control unit 27 prohibits the focusing operation by AF for a certain time (for example, about several seconds) to prevent the photographing optical system 21 from inadvertently focusing on the leaf 43. . Thereby, when the wind stops and the stamen part 42a returns to the distance measuring point index 12b, the lens side control part 27 can restart the focus adjustment promptly.
Such control according to the change in the defocus amount is desired to focus when the subject is low in contrast and it is difficult to determine the in-focus position, or when the target to be focused is small relative to the distance measurement range. This is effective when there are obstacles before and after the target.

  By repeating the processes of S7 to S10 described above, the focusing operation by AF is repeated, and the focusing operation is continuously performed even when the distance to the subject at the distance measuring point is changed. The operation as the ass AF mode is performed.

By the way, the normal camera system has a limit on the size of the finder, and there is a limit on the visual focusing (manual focus). Further, due to the difference between the incident light beam on the imaging surface and the incident light beam on the finder screen at the open aperture, there is a possibility that the best image plane position of the lens having large spherical aberration differs between the imaging surface and the finder screen. Furthermore, it is conceivable that the finder screen and the imaging plane at the imaging plane position do not exactly match due to manufacturing tolerances.
The camera system 1 according to the present embodiment can accurately perform the focusing operation without giving the above-mentioned problem by using the focusing operation by AF as the final focusing operation while giving a sense of manual focus. .

As described above, the camera system 1 according to the present embodiment performs the focusing operation by AF after the defocus amount is substantially within the in-focus range by the operation of the MF operation ring 23. As a result, assistance is provided by using the focusing operation by AF while giving the photographer the feeling of focusing with manual focus, so that the focusing operation can be performed accurately.
Further, the camera system 1 can easily and quickly perform an operation of changing the focus adjustment target by limiting the focus adjustment by autofocus according to the operation amount per unit time of the MF operation ring 23. . Further, by prohibiting the focusing operation by AF according to the swing amount, the focused state of the subject can be maintained even if the composition is changed.

[Second Embodiment]
Next, a second embodiment of the camera system to which the present invention is applied will be described.
The camera system 2 according to the second embodiment newly provides a second mode as a focus mode different from the first mode in the camera system 1 according to the first embodiment. The second mode is a mode in which the focus adjustment state is maintained when the defocus amount enters a range where it can be regarded as in-focus while the MF operation ring 23 is being operated.
In the following description, parts that perform the same functions as those of the first embodiment described above are given the same reference numerals or the same reference numerals at the end, and redundant descriptions are omitted as appropriate. Since the camera system 2 has the same configuration as that of the camera system 1, the components shown in FIG. 1 are used as components, and an example of the composition will be described with reference to FIG.

FIG. 5 is a flowchart showing the operation of the camera system 2 when the second mode is selected.
First, in S101, the photographer operates an operation unit (not shown) to select the second mode, and the process starts. For example, as shown in FIG. 3, when focusing on the face 41a from the state of focusing on the sky in the back, the photographer selects the distance measuring point index 12a, and the face that is the main imaging target The composition is determined so that the unit 41a enters the distance measuring point index 12a.
Since S102 to S104 are the same as the processes of S2 to S4 of the first embodiment, description thereof will be omitted.
In S105, the lens-side control unit 27 determines that the defocus amount is within a range that can be regarded as in-focus based on the output of the defocus amount detector 16 in accordance with the photographer's operation of the MF operation ring 23 (S105). : YES), after the focus determination display in the finder is changed to a display corresponding to “focus”, the process proceeds to S106. On the other hand, the lens side control unit 27 repeats the processing from S102 when it is not within the range that can be regarded as in-focus (S105: NO).

  In S <b> 106, the lens side control unit 27 determines whether or not the rotation speed of the MF operation ring 23 is within a specified speed based on the output of the MF operation ring rotation amount detector 24. This step is the same step as S9 in the first embodiment. When the rotational speed of the MF operation ring 23 is within the specified speed (S106: YES), the process proceeds to S107. On the other hand, when the rotational speed of the MF operation ring 23 exceeds the specified speed (S106: NO), the process proceeds to S120, the focus lens group is inhibited from being driven by the AF motor, and the processing from S102 is repeated.

In S107, the lens side control unit 27 continues to detect the operation amount of the MF operation ring 23 based on the output of the MF operation ring rotation amount detector 24.
In S108, the lens-side control unit 27 uses the drive amount of the focus lens group 22 corresponding to the operation amount of the MF operation ring 23 detected in S107 as the drive amount of the focus lens group 22 per unit rotation of the MF operation ring 23. Calculate based on
In S109, based on the drive amount of the focus lens group 22 calculated in S108, the AF motor 30 is driven to drive the focus lens group 22. However, the direction of driving the focus lens group 22 by driving the AF motor 30 in this step is opposite to the direction in which the focus lens group 22 is moved by operating the MF operation ring 23. That is, the focus lens group 22 is driven (cancellation drive) by driving the AF motor 30 so as to cancel the movement of the focus lens group 22 that is moved by operating the MF operation ring 23. After canceling driving in S109, the operation from S106 is repeated.

When it is determined in S105 that the defocus amount is within the range that can be regarded as in-focus (S105: YES), the MF operation ring 23 is operated when the focus determination display in the finder becomes a display corresponding to “focus”. If the photographer who stops the operation stops operating, the focused state is maintained. However, if the photographer continues to operate the MF operation ring 23, the defocus amount may exceed the range that can be regarded as in-focus. Therefore, in the second mode in the present embodiment, the operations of S107 to S109 are performed, and once the defocus amount enters the range that can be regarded as in-focus, the focus adjustment is performed regardless of the operation of the MF operation ring 23 by the photographer. It was decided to assist the photographer by performing offset driving to maintain the state.
In this embodiment, after the state that can be regarded as in-focus is obtained, the canceling drive is performed to maintain the in-focus state. However, the in-focus operation by AF may be used more actively. In other words, the lens-side control unit 27, once the face 41a that overlaps the distance-measuring point index 12a is in a state where it can be regarded as in-focus, moves the face 41a when the subject moves or the like. The in-focus state may be maintained by executing an in-focus operation based on the focus amount.

  As described above, the camera system 2 of the present embodiment maintains this state when the photographer operates the MF operation ring 23 and the defocus amount falls within the range where it can be regarded as in-focus. Thus, it is possible to accurately perform the focusing operation while giving the photographer the feeling that the focus is adjusted by manual focus.

(Deformation)
The present invention is not limited to the embodiment described above, and various modifications and changes are possible, and these are also within the equivalent scope of the present invention.
In the first embodiment, the lens side control unit 27 performs the focusing operation by AF after the defocus amount enters the range where it can be regarded as in-focus. However, the present invention is not limited to this. For example, in addition to the focusing operation by AF, the lens side control unit 27 may control the AF motor 30 based on the driving amount that cancels the focus adjustment amount by the MF operation ring 23 as in the second embodiment. .

  In the first embodiment, an example in which the defocus amount operates in the so-called continuous mode after entering the range where the defocus amount can be regarded as being substantially in focus has been described. However, the present invention is not limited to this. For example, when the defocus amount enters the range where it can be regarded as in-focus, and when the focusing operation by AF (S10) is performed without performing the processing of S6 to S7, the focus lens group 22 enters the range where it can be regarded as in-focus. The same operation as that of the so-called single mode may be performed.

It is a block diagram of camera system 1 of a 1st embodiment. It is a flowchart which shows the operation | movement at the time of 1st mode selection of 1st Embodiment. It is a figure which shows the example of a display of a finder of 1st Embodiment, and the example of a composition. It is a figure which shows the example of a display of a finder of 1st Embodiment, and the example of a composition. It is a flowchart which shows the operation | movement at the time of 2nd mode selection of 2nd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1, 2 ... Camera system, 10 ... Camera body, 11 ... Mirror, 12 ... Screen, 12a-12k ... Distance measuring point index, 14 ... Image sensor, 16 ... Defocus amount detector, 17 ... Body side control part, 21 Photographic optical system, 22 focus lens group, 23 MF operation ring, 24 MF operation ring rotation amount detector, 27 lens side control unit, 28 motor rotation angle calculator, 30 AF motor, 31 difference Moving mechanism, 32 ... focusing mechanism, 33 ... shake sensor

Claims (9)

An optical system having a focus lens group for focus adjustment;
A focus adjustment unit for adjusting the focus of the focus lens group according to a manual operation;
A focus detection unit for detecting a focus adjustment state of the optical system;
A drive unit that adjusts the focus of the focus lens group according to the focus adjustment state;
A control unit that performs focus adjustment control of the focus lens group by the drive unit when the focus adjustment state is substantially in focus by the focus adjustment unit;
A focus adjustment device. The focus adjustment apparatus according to claim 1,
The control unit controls the driving unit based on a focus adjustment amount by the focus adjustment unit after the focus adjustment state is substantially in focus by the focus adjustment unit;
Focus adjustment device characterized by. The focus adjustment device according to claim 1 or 2,
The focus adjustment unit and the drive unit drive the focus lens group via a differential mechanism;
Focus adjustment device characterized by. In the focus adjustment apparatus according to any one of claims 1 to 3,
An operation amount detection unit for detecting an operation amount of the focus adjustment unit;
The control unit prohibits the control by the drive unit when the operation amount per unit time by the operation amount detection unit is larger than a predetermined amount;
Focus adjustment device characterized by.   An optical apparatus comprising the focus adjustment device according to any one of claims 1 to 4. The optical apparatus according to claim 5, wherein
A detection unit that detects a composition change amount of the image by the optical system;
The control unit prohibits the control by the drive unit when the composition change amount by the detection unit is larger than a predetermined amount;
Optical equipment characterized by. An optical system having a focus lens group for focus adjustment;
A focus adjustment unit for adjusting the focus of the focus lens group according to a manual operation;
A drive unit for adjusting the focus lens group according to a focus adjustment state of the optical system;
A control unit that performs focus adjustment control of the focus lens group by the drive unit when the focus adjustment state is substantially in focus by the focus adjustment unit;
A lens barrel comprising: In the lens barrel according to claim 7,
A shake detection unit for detecting shake of the lens barrel;
The control unit prohibits the control by the driving unit when the shake detected by the shake detection unit is larger than a predetermined value;
A lens barrel characterized by A focus adjustment method for adjusting an optical system having a focus lens group movable by a manual operation and a driving source,
The focus lens group is moved by the manual operation,
Detecting the focus adjustment state of the optical system;
Controlling the focus lens group by the drive source when the focus adjustment state is substantially in focus;
Focus adjustment method characterized by.