JP6516032B2 - Lens barrel and camera system - Google Patents

Description

  The present invention relates to a lens barrel and a camera system.

  Conventionally, in an interchangeable lens camera system such as a single-lens reflex camera, for example, there is a possibility that the driveable range of the focusing lens may differ for each interchangeable lens. Therefore, the camera body that performs automatic focusing needs to receive information on the driveable range of the focusing lens from the interchangeable lens. For example, Patent Document 1 describes a lens-interchangeable digital camera that transmits the infinity drive limit position and the close drive limit position of the focusing lens from the interchangeable lens to the camera body.

JP 2008-275890 A

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

A lens barrel according to a first aspect of the present invention includes an attachment portion to which a camera body can be attached, an imaging optical system having a focusing lens, and a first position for performing drive control on the near side of the focusing lens. Between the drive unit capable of driving the focusing lens between the second position at the infinity side of the first position and the camera body when performing drive control on the infinity side of the focusing lens; A transmitting / receiving unit capable of transmitting / receiving a signal, a lens position detecting unit detecting a position of the focusing lens and outputting a lens position signal, and repeatedly transmitting the lens position signal to the camera body via a first transmission path; The image forming optical system includes an image forming optical system and a close focusing position corresponding to a close position on the image side where the image forming optical system can focus on the image plane through a second transmission line different from the first transmission line. The transmission / reception unit transmits the closest in-focus position, the first position, and the second position of the infinity in-focus position corresponding to the infinite-focus position that can be focused on to the camera body And a control unit for controlling the transmission / reception unit, and the lens position signal is expressed based on the infinite focusing position.
A lens barrel according to a second aspect of the present invention has an attachment portion to which a camera body can be attached, an imaging optical system having a focusing lens, and a first position for performing drive control on the near side of the focusing lens. Between the drive unit capable of driving the focusing lens between the second position at the infinity side of the first position and the camera body when performing drive control on the infinity side of the focusing lens; A transmitting / receiving unit capable of transmitting / receiving a signal, a lens position detecting unit detecting a position of the focusing lens and outputting a lens position signal, and repeatedly transmitting the lens position signal to the camera body via a first transmission path; A third position corresponding to a position on the near side where the imaging optical system can focus on the image plane via a second transmission path different from the first transmission path, the first position, and The transceiver unit and two positions and a control unit for controlling the transceiver to transmit to the camera body.
A camera system according to a third aspect of the present invention includes the lens barrel according to the first or second aspect, and a camera body attachable to the mounting portion.

  According to the present invention, suitable focusing can be performed.

FIG. 1 is a perspective view showing a lens interchangeable type camera system to which the present invention is applied. It is a sectional view showing a lens exchange type camera system to which the present invention is applied. It is a schematic diagram which shows the detail of the connection parts 102 and 202. FIG. It is a schematic diagram which shows the drive range of focusing lens 210d. It is a figure which shows the positional information memorize | stored in ROM215.

First Embodiment
FIG. 1 is a perspective view showing a lens interchangeable type 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 the other devices and devices will be omitted. The camera 1 is composed of a camera body 100 and a lens barrel 200 attachable to and detachable from the camera body 100. The lens barrel 200 is a so-called zoom lens whose focal length can be changed by an operation on a zoom ring (not shown).

  The camera body 100 is provided with a lens mount 101 to which a lens barrel 200 can be attached. The lens barrel 200 is provided with a lens mount 201 corresponding to the lens mount 101 on the body side and to which the camera body 100 can be attached. When the lens barrel 200 is mounted, the connecting portion 102 consisting of a plurality of contact points provided on the lens mount 101 is connected to the connecting portion 202 consisting of a plurality of contact points provided on the lens mount 201 of the lens barrel 200. Connected The connection portions 102 and 202 are used to supply power from the camera body 100 to the lens barrel 200 and to transmit and receive 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. Above the camera body 100, buttons 17a and 17b, which are input devices, are provided. The user uses these buttons 17a and 17b to issue a shooting instruction and a shooting instruction setting instruction to the camera body 100.

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

  Inside the lens barrel 200, a lens side control unit 203 that controls each part of the lens barrel 200 is provided. The lens side control unit 203 includes 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 a signal to / from the camera body 100 via the connection units 102 and 202. The lens drive unit 212 has an actuator such as a stepping motor, for example, and drives the focusing lens 210d in a range described later according to a signal input to the lens drive unit 212. The lens position detection unit 213, for example, counts the number of pulses of the signal input to the stepping motor of the lens drive unit 212, detects the position of the focusing lens 210d, and outputs a lens position signal. Alternatively, the position of the focusing lens 210d may be detected using a known distance encoder or the like provided in the lens barrel 200. The focal length detection unit 214 detects the focal length of the imaging optical system 210 using, for example, a zoom encoder, and outputs a focal length signal.

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

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

  Inside the camera body 100, a body side control unit 103 which controls the respective units of the camera body 100 is provided. The body side control unit 103 includes a microcomputer, a RAM, and peripheral circuits thereof that are not shown. A body side transmission / reception unit 117 is connected to the body side control unit 103. The body side transmission / reception unit 117 is connected to the connection unit 102, and can transmit / receive a signal to / from the lens side transmission / reception unit 217.

  On the back of the camera body 100, a display device 111 configured of an LCD panel or the like is disposed. The body side control unit 103 causes the display device 111 to display an image of an object based on the output of the imaging device 104 (so-called through image) and various menu screens for setting imaging conditions and the like.

(Description of auto focus adjustment)
The body side control unit 103 is configured to be able to execute a known automatic focusing process. The automatic focusing process includes a focus detection process for detecting the current focusing state, and a focusing process for driving the focusing lens to perform focusing according to the detection result. In the automatic focusing process, the body side control unit 103 is configured to be able to selectively use two types of focus detection processes. Specifically, the body side control unit 103 can selectively use so-called focus detection processing of the imaging plane phase difference detection method and focus detection processing of the so-called contrast detection method. The body side control unit 103 selectively uses these two types of focus detection processing according to the photographing condition, the characteristic 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 pixel for focus detection (referred to as a focus detection pixel). The focus detection pixel is the same as that described in JP-A-2007-317951. The body side control unit 103 performs focus detection processing by performing well-known phase difference detection calculation using pixel output data from the focus detection pixels. In addition, about this phase difference detection calculation, since it is the same as that of what is described, for example in Unexamined-Japanese-Patent No. 2007-317951, description is abbreviate | omitted. The body side control unit 103 performs automatic focusing by driving the focusing lens 210d based on the defocus amount obtained by the 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 performs well-known contrast detection calculation based on a so-called hill climbing method using pixel output data from the imaging pixels included in the imaging element 104 to calculate 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 performs automatic focusing by detecting the position of the focusing lens 210d at which the focus evaluation value reaches a peak.

(Description of data communication)
FIG. 3 is a schematic view showing the details of the connection parts 102 and 202. As shown in FIG. As shown in FIG. 3, each of the connections 102 and 202 has eight contacts for transmitting and receiving signals. That is, between the camera body 100 and the lens barrel 200, eight signal lines corresponding to the respective contact points exist. In addition to these contact points, for example, contact points and the like for supplying power from the camera body 100 to the lens barrel 200 are present, but illustration and description thereof will be omitted here. These eight signal lines are hereinafter referred to as HCLK, HREQ, HANS, HDAT, CLK, RDY, BDAT, LDAT as shown in FIG.

  Of the eight signal lines described above, HCLK, HREQ, HANS, HDAT constitute a first transmission path 310. Similarly, CLK, RDY, BDAT and LDAT constitute a second transmission path 320. Hereinafter, these two types of transmission paths will be described.

  The first transmission path 310 is used by the lens side transmission / reception unit 217 to transmit a lens position signal representing the position of the focusing lens 210 d to the camera body 100. The body side transmission / reception unit 117 changes the signal level of HREQ every predetermined period (for example, one millisecond). The lens control unit 203 starts communication preparation processing in response to a change in the signal level of HREQ. Specifically, the communication preparation process is a process of causing the lens position detection unit 213 to detect the position of the focusing lens 210 d and output a lens position signal to be transmitted to the camera body 100.

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

  The second transmission path 320 is used to transmit control instruction data from the camera body 100 to the lens barrel 200 and to transmit 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, simultaneously with the transmission of data from the camera body 100 to the lens barrel 200, the transmission of data from the lens barrel 200 to the camera body 100 is performed.

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

  The body side transmission / reception unit 117 transmits various control signals to the lens barrel 200 using the second transmission path 320 described above. As an example of the control signal, a control signal for moving the focusing lens 210d by a specific number of pulses (for example, 10 pulses) in an infinite distance direction, or a control for reducing the diaphragm (not shown) by a specific number of stages (for example, two steps) There is a signal etc.

  Other signals transmitted by the body side transmission / reception unit 117 using the second transmission path 320 include a request signal for requesting various information of the lens barrel 200. Examples of the request signal include a signal request signal representing the current focal length of the imaging optical system 210 and a signal request signal representing the current aperture value of the aperture stop (not shown). When receiving the above request signal, the lens side transmission / reception unit 217 transmits a corresponding signal to the body side transmission / reception unit 117 via the second transmission path 320.

  The time required for the body side transmission / reception unit 117 to receive any signal from the lens side transmission / reception unit 217 using the second transmission path 320 described above uses the first transmission path 310 to transmit the lens position signal. It will be large compared to the time required to receive. This is because the first transmission path 310 is notified that the lens side transmission / reception unit 217 is requesting data only by changing the signal level of HREQ, while the second transmission path 320 first transmits CLK and BDAT. It is necessary to transmit a request for specific information to the lens side transmission / reception unit 217 using 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 close focusing position.

(Description of the drive range by the lens drive unit 212)
FIG. 4 is a schematic view showing a drive range of the focusing lens 210d. The focusing lens 210 d is configured to be movable in an infinite distance direction 410 and a close direction 420 on an optical axis 400 indicated by an alternate long and short dash line in FIG. 4. A stopper (not shown) is provided at the end 430 in the infinitesimal direction 410 and the end 440 in the close direction 420 to limit the movement of the focusing lens 210d. That is, the focusing lens 210 d is configured to be movable from the end 430 in the infinity direction 410 to the end 440 in the close direction 420.

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

  The infinite limit position 450 is provided outside the infinite focusing position 470. The infinity focusing position 470 is the position of the focusing lens 210 d that corresponds to the position of the focusing lens 210 d that focuses on an object at infinity, that is, the position on the infinity side where the imaging optical system 210 can focus. . The reason for providing the infinite limit position 450 at such a position is that a peak of the focus evaluation value may be present at the infinite focusing position 470 when performing so-called hill-climbing automatic focusing. If the infinite focusing position 470 is made to coincide with the infinite limit position 450, there is a problem that the peak of the focus evaluation value present at the infinite focusing position 470 can not be recognized as a peak, which is not desirable. Similarly, the close limit position 460 is provided outside the close focus position 480. Here, the closest focusing position 480 is the position of the focusing lens 210d that corresponds to the position of the focusing lens 210d that focuses on the closest subject, that is, the closest position to which the imaging optical system 210 can focus.

  In the present embodiment, the position of the focusing lens 210 d is represented by the number of pulses of the signal supplied to the lens drive unit 212. In addition, the number of pulses uses the infinite focusing position 470 as the origin (reference). 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, in order to move the focusing lens 210d from the infinite limit position 450 to the close limit position 460, a signal of 10000 pulses may be given to the lens driving unit 212.

  Of course, the infinite limit position 450, the close limit position 460, and the close focus position 480 may be different from the above values, and may be different depending on the type of lens barrel and the individual.

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

  Therefore, in the present embodiment, the close focusing position 480 corresponding to each focal length is stored in advance in the ROM 215 in the form of a position information table, and the close focusing position 480 corresponding to the current focal distance is transmitted to 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 the ROM 215. As shown in FIG. In the ROM 215, a position information table 510 shown in FIG. 5A is stored in advance. The position information table 510 is a table in which the closest focusing position and the focal length of the imaging optical system 210 are associated. According to the position information table 510 shown in FIG. 5A, for example, when the focal length of the imaging optical system 210 is 20 mm, the closest focusing position is the position of 9800 pulses. When the focal length is 30 mm, the closest focusing position is the position of 9750 pulses.

  The lens side control unit 203 uses the focal distance signal output from the focal distance detection unit 214 to position the closest focusing position corresponding to the current focal distance according to the change of the focal distance 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 of a close 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 close focus position is transmitted to the body side transmission / reception unit 117.

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

  When storing the closest focus position in the RAM 216, the lens side control unit 203 stores the closest limit position 460 and the infinite limit position 450 included in the limit position information table 520, in the RAM 216. Then, when the lens side transmission / reception unit 217 receives a 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. The body side control unit 103 determines the number of pulses for moving the focusing lens 210d to the target position based on the information received by the body side transmission / reception unit 117, and the focusing lens 210d in the focus detection process of the contrast method. Determine the scan range of

  The position information table 510 does not have 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 control unit 203 sets the closest in-focus position corresponding to the actual focal length from the closest in-focus position corresponding to the front and rear focal lengths. Calculated by interpolation.

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 sets the closest focusing position corresponding to the closest position where the imaging optical system 210 can focus, the closest limit position corresponding to the driving limit position on the closest side, and infinity An infinite limit position corresponding to the position of the drive limit on the far side is acquired. Then, the lens side control unit 203 controls the lens side transmission / reception unit 217 such that the lens side transmission / reception unit 217 transmits the close in-focus position, the close proximity limit position, and the infinite limit position to the camera body 100. Since this is done, it is possible to reduce the amount of driving of the focusing lens in automatic focusing.

(2) The imaging optical system 210 can change the focal length, and the focal distance detection unit 214 detects the focal length of the imaging optical system 210 and outputs a focal distance signal. The ROM 215 stores a position information table in which the focal length of the imaging optical system 210 is associated with the close in-focus position. The lens side control unit 203 acquires the close focusing position from the ROM 215 using the focal distance signal output from the focal distance detection unit 214 according to the change of the focal distance of the imaging optical system 210 and stores it in the RAM 216 . After that, the lens side control unit 203 transmits the close focusing position stored in the RAM 216 to the camera body 100 according to the request signal received from the camera body 100 so that the lens side transmission and reception unit 217 transmits the close focus position to the camera body 100. Control. As a result, the latest close focus 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 path 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 the second transmission line 320 different from the first transmission line 310. Since this is done, the transmission of the lens position signal is not disturbed by the transmission of the close in-focus position and 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, it is not necessary to transmit the infinity in-focus position to the camera body 100.

(5) The lens side transmission / reception unit 217 repeatedly transmits the lens position signal at a frequency higher than the transmission frequency of the close focusing position. Since this is done, the response of automatic focusing is improved.

  Although the embodiment of the lens interchangeable type camera system which is a camera system including the detachable lens barrel and the 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 1)
The near focus position according to the focal length may be acquired by a method other than the lens side control unit 203 referring to the position information table 510. For example, the lens side control unit 203 may be provided with an operation unit for calculating the close in-focus position of the imaging optical system 210 from the focal distance, and the operation unit may calculate the close in-focus position.

(Modification 2)
In the embodiment described above, when a change in focal length is detected, the corresponding close focusing position is stored in the RAM 216 accordingly. However, the close focus position is transmitted to the camera body 100 when the request signal from the camera body 100 is received. The present invention is also applied to an embodiment in which the close focusing position is transmitted to the camera body 100 according to the change of the focal length, instead of transmitting the close focusing position through the RAM 216 as described above. Is possible.

(Modification 3)
Transmission of the lens position signal by the lens side transmission / reception unit 217, the close focal position, the close limit position, and the infinite limit position is performed only while the body side control unit 103 is executing the automatic focusing process. You may do so. Alternatively, the transmission frequency may be changed during execution of the automatic focusing process and in other cases.

(Modification 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 closest focus position, the closest limit position, and the infinite limit position to the camera body 100. Was. Among these three positions transmitted to the camera body 100, the lens side control unit 203 so as to transmit a position closer to the inner side (infinity side) than the position of the drive limit on the nearest side instead of the close limit position. May be configured. However, this position should be closer to the closest limit position than the closest focus 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 and determines the number of pulses for moving the focusing lens 210d to the target position, or in the focus detection processing of the contrast method. The scan range of the focusing lens 210d is determined. Similarly, with respect to the infinite limit position, a position closer to the inner side (closer side) than the actual infinite drive limit position may be transmitted instead. That is, instead of the infinite limit position, an intermediate position between the infinite limit position and the infinity in-focus position may be transmitted.

  Note that 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 a position transmitted to the camera body 100 instead of the infinite limit position ( Or, it is desirable that the distance be greater than the distance between the infinite limit position itself and the infinity in-focus position. This is due to the fact that focusing near the closest focusing position is more difficult than focusing near the infinity focusing position. By configuring in this way, it is possible to suppress false focusing in the vicinity of the closest focusing position.

  The present invention is not limited to the above embodiment as long as the features of the present invention are not impaired, and other embodiments considered within the scope of the technical idea of the present invention are also included in the scope of the present invention. .

DESCRIPTION OF SYMBOLS 1 ... camera, 100 ... camera body, 103 ... body side control part, 117 ... body side transmission / reception part, 200 ... lens barrel, 201 ... lens mount, 202 ... connection part, 203 ... lens side control part, 210 ... image formation Optical system, 210d: focusing lens, 212: lens drive unit, 213: lens position detection unit, 214: focal length detection unit, 215: ROM, 216: RAM, 217: lens side transmission / reception unit, 310: first transmission path, 320 ... second transmission line

Claims (7)

A mounting portion to which the camera body can be mounted,
An imaging optical system having a focusing lens,
The first position when performing drive control on the near side of the focusing lens, and the second position on the infinity side of the first position when performing drive control on the infinity side of the focusing lens. A driving unit capable of driving the focusing lens;
A transmitting / receiving unit capable of transmitting / receiving a signal to / from the camera body;
A lens position detection unit that detects the position of the focusing lens and outputs a lens position signal;
The lens position signal is repeatedly transmitted to the camera body via the first transmission path, and the image forming optical system can be focused on the image plane via the second transmission path different from the first transmission path. The first focusing position and the first focusing position among the closest focusing position corresponding to the first position and the infinity focusing position corresponding to the infinity side position where the imaging optical system can focus on the image plane And a control unit configured to control the transmitting and receiving unit such that the transmitting and receiving unit transmits the second position to the camera body.
The lens barrel in which the lens position signal is expressed with reference to the infinite focusing position. In the lens barrel according to claim 1,
The first position is the closest limit position corresponding to the limit position when performing drive control on the near side of the focusing lens, and the second position is drive control on the infinity side of the focusing lens. A lens barrel which is an infinite limit position corresponding to the limit position of the lens. The lens barrel according to claim 1 or 2
The closest focusing position corresponds to the closest focusing position corresponding to the closest position where the imaging optical system can focus on the image plane, and the infinite focusing position corresponds to the image plane of the imaging optical system A lens barrel that corresponds to the position on the infinity side where focusing is possible. A mounting portion to which the camera body can be mounted,
An imaging optical system having a focusing lens,
The first position when performing drive control on the near side of the focusing lens, and the second position on the infinity side of the first position when performing drive control on the infinity side of the focusing lens A driving unit capable of driving the focusing lens;
A transmitting / receiving unit capable of transmitting / receiving a signal to / from the camera body;
A lens position detection unit that detects the position of the focusing lens and outputs a lens position signal;
The lens position signal is repeatedly transmitted to the camera body via the first transmission path, and the image forming optical system can be focused on the image plane via the second transmission path different from the first transmission path. A control unit that controls the transmission / reception unit such that the transmission / reception unit transmits a third position corresponding to the position of the first position, the first position, and the second position to the camera body;
Lens barrel equipped with In the lens barrel according to claim 4,
The lens barrel transmits the third position of the third position and a fourth position corresponding to a position on the infinity side where the imaging optical system can focus on the image plane. In the lens barrel according to claim 5,
The lens barrel in which the lens position signal is expressed with reference to the fourth position. A lens barrel according to any one of claims 1 to 6;
A camera system having a camera body attachable to the mounting portion;

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