JP6809554B2 - Lens barrel - Google Patents

Description

The present invention relates to a lens barrel.

Conventionally, in an interchangeable lens type camera system such as a single-lens reflex camera, the driveable range of the focusing lens may differ for each interchangeable lens. Therefore, the camera body that performs autofocus adjustment needs to receive information about the driveable range of the focusing lens from the interchangeable lens. For example, Patent Document 1 describes an interchangeable lens digital camera that transmits an infinite side drive limit position and a near side drive limit position of a focusing lens from an interchangeable lens to a camera body.

Japanese Unexamined Patent Publication No. 2008-275890

Since the interchangeable lens digital camera described in Patent Document 1 does not exchange information regarding the position of the focusing lens corresponding to the shortest shooting distance, the driving of the focusing lens is wasted in the automatic focus adjustment.

The lens barrel according to the present invention has an optical system that has a lens that moves in the optical axis direction and forms an image of a subject, a detection unit that detects the position of the lens, and an imaging element that captures an image of the optical system. a communication unit that communicates with the camera body with the information indicating the position of the lens detected by the detecting unit, a first sending time interval, the lens that is movable range through the communication unit first position shown, the second position, and information indicating a third position between the first position and the second position, than the first time interval via the communication unit It has a control unit that transmits to the camera body at a long second time interval .

According to the present invention, suitable focus adjustment can be performed.

It is a perspective view which showed the camera system of the interchangeable lens type to which this invention was applied. It is sectional drawing which showed the interchangeable-lens type camera system to which this invention was applied. It is a schematic diagram which shows the detail of the connection part 102, 202. It is a schematic diagram which shows the drive range of a focusing lens 210d. It is a figure which shows the position information stored in ROM 215.

(First Embodiment)
FIG. 1 is a perspective view showing an interchangeable lens camera system to which the present invention is applied. Note that FIG. 1 shows only the devices and devices according to the present invention, and the illustration and description of other devices and devices will be omitted. The camera 1 includes a camera body 100 and a lens barrel 200 that can be attached to and detached from the camera body 100. The lens barrel 200 is a so-called zoom lens whose focal length can be changed by operating a zoom ring (not shown).

The camera body 100 is provided with a lens mount 101 to which the lens barrel 200 can be attached. In addition, the lens barrel 200 corresponds to the lens mount 101 on the body side.
A lens mount 201 to which the camera body 100 can be attached is provided. When the lens barrel 200 is attached, the connecting portion 102 composed of a plurality of contacts provided on the lens mount 101 becomes the connecting portion 202 composed of a plurality of contacts provided on the lens mount 201 of the lens barrel 200. Be connected. The connection portions 102 and 202 are used for supplying electric power from the camera body 100 to the lens barrel 200 and for transmitting and receiving signals between the camera body 100 and the lens barrel 200.

An image sensor 104 is provided behind the lens mount 101 in the camera body 100.
Buttons 17a and 17b, which are input devices, are provided above the camera body 100.
The user gives a shooting instruction, a shooting condition setting instruction, and the like to the camera body 100 by using these buttons 17a and 17b.

FIG. 2 is a cross-sectional view showing an interchangeable lens camera system to which the present invention is applied. The lens barrel 200 includes an imaging optical system 210 for forming an image of a subject image. The imaging optical system 210 is composed of a plurality of lenses 210a to 210e. These plurality of lenses 210a ~
The 210e includes a focusing lens 210d for controlling the focus position of the subject image. The imaging optical system 210 is configured so that the focal length can be changed by a zoom ring (not shown).

Inside the lens barrel 200, a lens-side control unit 20 that controls each part of the lens barrel 200
3 is provided. The lens-side control unit 203 is composed of a microcomputer (not shown) and peripheral circuits thereof. A lens-side transmission / reception unit 217, a lens drive unit 212, a lens position detection unit 213, a focal length detection unit 214, a ROM 215, and a RAM 216 are connected to the lens-side control unit 203.

The lens-side transmission / reception unit 217 can transmit / receive signals to / from the camera body 100 via the connection units 102 and 202. The lens driving unit 212 has an actuator such as a stepping motor, for example, and the focusing lens 2 responds to a signal input to the lens driving unit 212.
10d is driven in the range described later. The lens position detection unit 213 is, for example, the lens drive unit 21.
The number of pulses of the signal input to the stepping motor of 2 is counted, the position of the focusing lens 210d is detected, and the lens position signal is output. Alternatively, the lens barrel 20
The position of the focusing lens 210d may be detected by using a well-known distance encoder or the like provided at 0. The focal length detection unit 214 detects the focal length of the imaging optical system 210 using, for example, a zoom encoder or the like, and outputs a focal length signal.

The ROM 215 is a non-volatile storage medium, and a predetermined control program executed by the lens-side control unit 203, a position information table to be described later, and the like are stored in advance. The RAM 216 is a volatile storage medium, and is used as a storage area for various data by the lens-side control unit 203.

A shutter 115 and a filter 116 are provided on the front surface of the image sensor 104. The subject light transmitted through the imaging optical system 210 is the shutter 115 and the filter 116.
It is incident on the image sensor 104 via. The shutter 115 controls the exposure state of the image sensor 104. The filter 116 is an optical filter that combines an optical low-pass filter and an infrared cut filter.

Inside the camera body 100, a body-side control unit 103 that controls each part of the camera body 100 is provided. The body-side control unit 103 is a microcomputer (RA) (not shown).
It is composed of M and its peripheral circuits. The body side control unit 103 has a body side transmission / reception unit 1
17 is connected. The body-side transmission / reception unit 117 is connected to the connection unit 102, and can transmit / receive signals to / from the lens-side transmission / reception unit 217.

A display device 111 composed of an LCD panel or the like is arranged on the back surface of the camera body 100. The body-side control unit 103 displays on the display device 111 various menu screens for setting an image of the subject (so-called through image) based on the output of the image sensor 104, shooting conditions, and the like.

(Explanation of autofocus adjustment)
The body-side control unit 103 is configured to be able to execute a well-known automatic focus adjustment process. The automatic focus adjustment process includes a focus detection process for detecting the current focus adjustment state and a focus adjustment process for driving a focusing lens to perform focus adjustment according to the detection result. In the automatic focus adjustment process, the body side control unit 103 is configured to be able to properly use two types of focus detection processes. Specifically, the body-side control unit 103 can properly use the so-called focus detection process of the imaging surface phase difference detection method and the focus detection process of the so-called contrast detection method. The body-side control unit 103 properly uses these two types of focus detection processes according to the shooting conditions, the characteristics of the subject, and the like.

The focus detection process of the imaging surface phase difference detection method by the body side control unit 103 will be described.
The image sensor 104 of the present embodiment has a focus detection pixel (referred to as a focus detection pixel). The focus detection pixel is the same as that described in Japanese Patent Application Laid-Open No. 2007-317951. The body-side control unit 103 performs the focus detection process by performing a well-known phase difference detection calculation using the pixel output data from the focus detection pixel. Since this phase difference detection operation is the same as that described in JP-A-2007-317951, for example, the description thereof will be omitted. The body-side control unit 103 automatically adjusts the focus by driving the focusing lens 210d based on the defocus amount obtained by this focus detection process.

The focus detection process of the contrast detection method by the body side control unit 103 will be described.
The body-side control unit 103 uses the pixel output data from the imaging pixels of the image sensor 104 to perform a well-known contrast detection calculation based on the so-called hill climbing method, and calculates a focus evaluation value (contrast value). The body-side control unit 103 performs this contrast detection calculation while driving the focusing lens 210d in a range described later, and automatically adjusts the focus by detecting the position of the focusing lens 210d at which the focus evaluation value peaks.

(Explanation of data communication)
FIG. 3 is a schematic view showing details of the connection portions 102 and 202. As shown in FIG. 3, the connection portion 1
Each of 02 and 202 has eight contacts for transmitting and receiving signals. That is, between the camera body 100 and the lens barrel 200, there are eight signal lines corresponding to the respective contacts. In addition to these contacts, for example, there are contacts for supplying power from the camera body 100 to the lens barrel 200, but illustration and description thereof will be omitted here. Hereinafter, these eight signal lines are shown in HCLK, HEQU, and HANS as shown in FIG.
, HDAT, CLK, RDY, BDAT, LDAT.

Of the eight signal lines described above, HCLK, HRQ, HANS, and HDAT form the first transmission line 310. Similarly, CLK, RDY, BDAT, and LDAT form the second transmission line 320. Hereinafter, these two types of transmission lines will be described.

The first transmission line 310 is used by the lens-side transmission / reception unit 217 to transmit a lens position signal representing the position of the focusing lens 210d to the camera body 100. The body-side transmission / reception unit 117 changes the HEQU signal level every predetermined cycle (for example, 1 millisecond). The lens-side control unit 203 starts the communication preparation process according to the change in the signal level of the HRQ. Specifically, this communication preparation process involves focusing lens 2 on the lens position detection unit 213.
This is a process of detecting the position of 10d and outputting a lens position signal to be transmitted to the camera body 100.

When the communication preparation process is completed, the lens-side transmitter / receiver 217 changes the signal level of the HANS device. The body-side transmission / reception unit 117 outputs a clock signal to HCLK in response to a change in the HANS signal level. The lens-side transmitter / receiver 217 outputs a lens position signal to HDAT in synchronization with this clock signal.

The second transmission path 320 is used for transmitting control instruction data from the camera body 100 to the lens barrel 200 and for transmitting various data from the lens barrel 200 to the camera body 100.
The second transmission line 320 is a full-duplex transmission line. That is, at the same time as the data is transmitted from the camera body 100 to the lens barrel 200, the data is transmitted from the lens barrel 200 to the camera body 100.

When the body-side control unit 103 needs to perform communication using the second transmission line 320, the body-side control unit 103 controls the body-side transmission / reception unit 117 to output a clock signal to the CLK. At this time, the body-side transmission / reception unit 117 outputs the data to be transmitted to the BDAT in synchronization with the clock signal. On the other hand, the lens-side transmission / reception unit 217 outputs the data to be transmitted to the LDAT in synchronization with the clock signal. The lens-side transmission / reception unit 217 changes the signal level of the RDY depending on whether data can be transmitted / received or not. For example, the RDY signal level is set to H when the lens-side transmission / reception unit 217 is in a state where data cannot be transmitted / received, and is set to L when the data can be transmitted / received. The body-side transmission / reception unit 117 confirms the RDY signal level before the start of communication, and does not perform communication when the lens-side transmission / reception unit 217 is in a state where data cannot be transmitted / received.

The body-side transmitter / receiver 117 uses the second transmission path 320 described above, and the lens barrel 20
Various control signals are transmitted to 0. As an example of the control signal, the focusing lens 210d
A control signal that moves a specific number of pulses (for example, 10 pulses) in the infinity direction, or an aperture (
There is a control signal that narrows down (not shown) by a specific number of stages (for example, two stages).

In addition to the signals transmitted by the body-side transmission / reception unit 117 using the second transmission line 320, there is a request signal requesting various information of the lens barrel 200. As an example of the required signal, the imaging optical system 21
There is a request signal of a signal representing the current focal length of 0, a request signal of a signal representing the current aperture value of the aperture (not shown), and the like. When the lens-side transmission / reception unit 217 receives the above request signal, the lens-side transmission / reception unit 217 transmits the corresponding signal to the body-side transmission / reception unit 117 via the second transmission line 320.

The time required for the body-side transmission / reception unit 117 to receive some signal from the lens-side transmission / reception unit 217 using the second transmission line 320 is the lens position signal using the first transmission line 310. It will be larger than the time required to receive. This is the first transmission line 31
At 0, it was reported that data was requested from the lens-side transmitter / receiver 217 simply by changing the signal level of HRQ, whereas at the second transmission line 320, CLK and BDA were first received.
This is because it is necessary to transmit a request for specific information to the lens-side transmission / reception unit 217 using T. Therefore, the lens-side transmission / reception unit 217 can repeatedly transmit the lens position signal at a frequency higher than the transmission frequency of the closest focusing position.

(Explanation of drive range by lens drive unit 212)
FIG. 4 is a schematic view showing a driving range of the focusing lens 210d. The focusing lens 210d is configured to be movable in the infinity direction 410 and the near direction 420 on the optical axis 400 shown by the alternate long and short dash line in FIG. A stopper (not shown) is provided at the end 430 of the infinity direction 410 and the end 440 of the near direction 420, and the focusing lens 2
Limit the movement of 10d. That is, the focusing lens 210d is configured to be movable from the end 430 of the infinity direction 410 to the end 440 of the closest direction 420.

However, the range in which the lens driving unit 212 actually moves the focusing lens 210d is smaller than the above-mentioned range from the end portion 430 to the end portion 440. Specifically describing this movement range, the lens driving unit 212 is provided from the infinite limit position 450 provided inside the end 430 of the infinity direction 410 to the close limit provided inside the end 440 of the near direction 420. The focusing lens 210d is driven in the range up to the position 460. That is, the lens driving unit 212 drives the focusing lens 210d between the near limit position 460 corresponding to the drive limit position on the near side and the infinity limit position 450 corresponding to the drive limit position on the infinity side.

The infinite limit position 450 is provided outside the infinite focusing position 470. The infinity focusing position 470 is the focusing lens 21 corresponding to the position of the focusing lens 210d that focuses on the subject at infinity, that is, the position on the most infinity side where the imaging optical system 210 can focus.
It is the position of 0d. The reason why the infinite limit position 450 is provided at such a position is that a peak of the focus evaluation value may exist at the infinite focus position 470 when the automatic focus adjustment by the so-called hill climbing method is performed. If the infinite focus position 470 is matched with the infinite limit position 450, there is a problem that the peak of the focus evaluation value existing at the infinite focus position 470 cannot be recognized as a peak, which is not desirable. Similarly, the closest limit position 460 is provided outside the closest focusing position 480. Here, the closest focusing position 480 is the position of the focusing lens 210d that focuses on the closest subject, that is, the position of the focusing lens 210d that corresponds to the position on the closest side where the imaging optical system 210 can focus.

In the present embodiment, the position of the focusing lens 210d is represented by the number of pulses of the signal given to the lens driving unit 212. The origin (reference) of the number of pulses is the infinite focusing position 470. For example, as shown in FIG. 4, the infinite limit position 450 is the position of -100 pulses, the close focus position 480 is the position of 9800 pulses, and the close limit position 460 is the position of 9900 pulses. In this case, the focusing lens 210d is moved from the infinite limit position 450 to the close limit position 46.
In order to move the lens to 0, a signal of 10000 pulses may be given to the lens driving unit 212.

Needless to say, the infinite limit position 450, the close limit position 460, and the close focus position 480 may be different from the above numerical values, and may be further different depending on the type and individual of the lens barrel.

(Explanation of location information table)
The body-side control unit 103, for example, when performing automatic focus adjustment, the infinite limit position 450 described above.
, The closest limit position 460, and the closest focusing position 480 need to be known. However, as described above, the focal length of the imaging optical system 210 is variable, and the close focus position 480 fluctuates according to the focal length.

Therefore, in the present embodiment, the closest focusing position 480 corresponding to each focal length is stored in the ROM 215 in advance in the form of a position information table, and the closest focusing position 480 corresponding to the current focal length is stored.
Is periodically transmitted from the lens-side transmission / reception unit 217 to the body-side transmission / reception unit 117 via the second transmission line.

FIG. 5 is a diagram showing position information stored in ROM 215. ROM215 has
The position information table 510 shown in FIG. 5A is stored in advance. Location information table 51
0 is a table in which the close focus position is associated with the focal length of the imaging optical system 210. Figure 5
According to the position information table 510 shown in (a), for example, the focal length of the imaging optical system 210 is 2.
When it is 0 mm, the closest focusing position is the position of 9800 pulses. Also, the focal length is 30 mm.
At the time of, the closest focusing position is the position of 9750 pulses.

The lens-side control unit 203 uses the focal length signal output from the focal length detection unit 214 to position the closest focusing position corresponding to the current focal length in response to a change in the focal length of the imaging optical system 210. It is acquired from the information table 510 and stored in the RAM 216. Then, when the lens-side transmission / reception unit 217 receives a request signal for the closest focusing position from the camera body 100 via the second transmission path 320, the lens-side transmission / reception unit 217 is controlled accordingly and stored in the RAM 216. The closest focusing position is transmitted to the body side transmission / reception unit 117.

The limit position information table 520 shown in FIG. 5B is further stored in the ROM 215. The limit position information table 520 is a table including a close limit position 460 and an infinite limit position 450.

When the lens-side control unit 203 stores the closest focusing position in the RAM 216, the lens side control unit 203 combines the closest limit position 460 and the infinite limit position 450 included in the limit position information table 520 with RA.
Store in M216. Then, when the lens-side transmission / reception unit 217 receives the request signal from the camera body 100, the lens-side transmission / reception unit 217 is controlled so that these three pieces of information stored in the RAM 216 are combined and transmitted to the body-side transmission / reception unit 117. Body side control unit 1
03 determines the number of pulses for moving the focusing lens 210d to a target position based on the information received by the body-side transmission / reception unit 117, and determines the scanning range of the focusing lens 210d in the contrast-type focus detection process. Make a decision.

The position information table 510 does not need to include the closest focusing position corresponding to all the focal lengths that can be set in the imaging optical system 210. When a focal length not included in the position information table 510 is set, the lens-side control unit 203 shifts the closest focal length corresponding to the actual focal length from the closest focal length corresponding to the front and rear focal lengths. Calculated by interpolation calculation.

According to the camera system according to the first embodiment described above, the following effects can be obtained.
(1) The lens-side control unit 203 has an infinite number of close-up focusing positions corresponding to the closest possible positions in which the imaging optical system 210 can be focused, and close-up limit positions corresponding to the closest drive limit positions. Acquires the infinite limit position corresponding to the position of the drive limit on the far side. Then, the lens side control unit 203 controls the lens side transmission / reception unit 217 so that the lens side transmission / reception unit 217 transmits the close focus position, the close limit position, and the infinite limit position to the camera body 100. Since this is done, the driving amount of the focusing lens in the automatic focus adjustment can be reduced.

(2) The focal length of the imaging optical system 210 can be changed, and the focal length detection unit 214 detects the focal length of the imaging optical system 210 and outputs a focal length signal. ROM 215 has an imaging optical system 2
A position information table in which the focal lengths of 10 are associated with the close focus position is stored. The lens-side control unit 203 receives the focal length detection unit 21 in response to a change in the focal length of the imaging optical system 210.
The closest focusing position is acquired from ROM 215 using the focal length signal output from 4 and RAM.
Store in 216. After that, the lens-side control unit 203 sets the closest focusing position stored in the RAM 216 in the lens-side transmission / reception unit 21 in response to the request signal received from the camera body 100.
The lens-side transmitter / receiver 217 is controlled so that the 7 transmits to the camera body 100. Since this is done, the latest closest focusing position is transmitted to the camera body 100 at an appropriate timing.

(3) The lens position detection unit 213 detects the position of the focusing lens 210d and outputs a lens position signal. The lens-side transmission / reception unit 217 repeatedly transmits the lens position signal output by the lens position detection unit 213 to the camera body 100 via the first transmission line 310. On the other hand, the close focus position, the close limit position, and the infinite limit position are transmitted to the camera body 100 via a second transmission line 320 different from the first transmission line 310. Since this is done, the transmission of the lens position signal is not hindered by the transmission of the close focus position or the like.

(4) The lens position signal represents the position of the focusing lens 210d with reference to the infinite focusing position of the imaging optical system 210. Since this is done, the infinite focus position is set to the camera body 100.
No need to send to.

(5) The lens-side transmission / reception unit 217 repeatedly transmits the lens position signal at a frequency higher than the transmission frequency of the closest focusing position. By doing so, the response of the autofocus adjustment is improved.

Although the embodiment of the interchangeable lens camera system, which is a camera system including a detachable lens barrel and a camera body, has been described above, the present invention is not limited to such an embodiment. The following modifications are also within the scope of the present invention, and one or more of the modifications can be combined with the above-described embodiment.

(Modification example 1)
The lens-side control unit 203 may acquire the closest in-focus position according to the focal length by a method other than referring to the position information table 510. For example, from the focal length, the imaging optical system 2
A calculation unit for calculating the closest focus position of 10 may be provided in the lens side control unit 203, and the calculation unit may be made to calculate the closest focus position.

(Modification 2)
In the above-described embodiment, when a change in the focal length is detected, the corresponding closest in-focus position is stored in the RAM 216. However, the closest focusing position is transmitted to the camera body 100 when the request signal from the camera body 100 is received. The present invention does not transmit the close focus position via the RAM 216 in this way.
It is also possible to apply to an embodiment in which the closest focusing position is transmitted to the camera body 100 according to a change in the focal length.

(Modification 3)
The lens position signal by the lens-side transmitter / receiver 217, the close focus position, the close limit position,
The transmission to the infinite limit position may be performed only while the body-side control unit 103 is executing the automatic focus adjustment process. Alternatively, the transmission frequency may be changed depending on whether the automatic focus adjustment process is being executed or not.

(Modification example 4)
In the above embodiment, the lens side control unit 203 controls the lens side transmission / reception unit 217 so that the lens side transmission / reception unit 217 transmits the close focus position, the close limit position, and the infinite limit position to the camera body 100. Was. Of these three positions transmitted to the camera body 100, the lens side control unit 203 is transmitted so as to transmit a position closer to the inside (infinity side) than the actual drive limit position on the closest side instead of the closest limit position. May be configured. However, this position must be closer to the closest limit position than the closest focusing position. In other words, instead of the close limit position, an intermediate position between the close limit position and the close focus position may be transmitted. In this case, the body-side control unit 103 recognizes the above intermediate position as the closest limit position, determines the number of pulses for moving the focusing lens 210d to the target position, and performs contrast-type focus detection processing. The scanning range of the focusing lens 210d is determined. Similarly, for the infinite limit position, a position closer to the inside (closest side) than the actual drive limit position on the infinite side may be transmitted instead. That is, instead of the infinite limit position
An intermediate position between the infinite limit position and the infinite focus position may be transmitted.

The distance between the position transmitted to the camera body 100 instead of the close limit position (or the close limit position itself) and the close focus position is the position transmitted to the camera body 100 instead of the infinite limit position (or the close limit position itself). Or it is desirable that it is larger than the distance between the infinite limit position itself) and the infinite focus position. This is because it is more difficult to focus in the vicinity of the close focus position than in the vicinity of the infinite focus position. With this configuration, false focusing in the vicinity of the closest focusing position can be suppressed.

The present invention is not limited to the above-described embodiment as long as the features of the present invention are not impaired.
Other forms considered within the scope of the technical idea of the present invention are also included within the scope of the present invention.

1 ... Camera, 100 ... Camera body, 103 ... Body side control unit, 117 ... Body side transmitter / receiver, 200 ... Lens barrel, 201 ... Lens mount, 202 ... Connection unit, 203 ... Lens side control unit, 210 ... Imaging Optical system, 210d ... Focusing lens, 212 ... Lens drive unit, 213 ... Lens position detection unit, 214 ... Focal length detection unit, 215 ... ROM, 216 ... RA
M, 217 ... Lens side transmitter / receiver, 310 ... First transmission line, 320 ... Second transmission line

Claims (10)

An optical system that has a lens that moves in the optical axis direction and forms an image of the subject,
A detection unit that detects the position of the lens and
A communication unit that communicates with a camera body having an image sensor that captures an image of the optical system.
Information indicating the position of the lens detected by the detection unit is transmitted via the communication unit at the first time interval, and the first position, the second position, and the range indicating the movable range of the lens are transmitted. Information indicating a third position between the first position and the second position is transmitted to the camera body via the communication unit at a second time interval longer than the first time interval. Control unit and
Lens barrel with. In the lens barrel according to claim 1,
The movable range of the lens is an electrically controlled range provided inside the physically limited range of movement of the lens. In the lens barrel according to claim 1 or 2.
The third position is a lens barrel that is the position of the lens corresponding to the closest shooting distance among the shooting distances set so that the optical system can shoot. In the lens barrel according to any one of claims 1 to 3,
The optical system can change the focal length,
The third position is a lens barrel that differs depending on the focal length of the optical system. In the lens barrel according to any one of claims 1 to 4,
A lens barrel in which the first position and the second position do not change even if the focal length of the optical system changes. In the lens barrel according to any one of claims 1 to 5,
The first position, the second position, and the third position are shown with the position of the lens in which the image of the subject at an infinity position from the optical system is focused on the image sensor as a reference position. Lens barrel. In the lens barrel according to any one of claims 1 to 6,
The lens barrel, wherein the first position is indicated by a negative value, and the second position and the third position are indicated by a positive value. In the lens barrel according to any one of claims 1 to 7.
An image of the subject at a second distance farther than the first distance from the optical system from the position of the lens in which the image of the subject at a first distance from the optical system is in focus on the image pickup element. The direction of movement toward the position of the lens in focus on the image pickup element is the infinity direction, the direction opposite to the infinity direction is the closest direction, and the first position is within the range in which the lens can move. The lens barrel, which is the position of the lens in the most infinity direction. In the lens barrel according to claim 8,
The second position is the position of the lens in the closest direction in the movable range of the lens, the lens barrel. In the lens barrel according to claim 8 or 9, which cites claim 6.
The first position is the position of the lens in the infinity direction from the position of the lens in which the image of the subject at a position at infinity from the optical system is in focus on the image sensor. Lens barrel.

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