JP2011112663A - Lens barrel and imaging apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an imaging apparatus which can reduce an operation noise during wobbling operation. <P>SOLUTION: The imaging apparatus includes: an imaging means 22 to pick up an image through an optical system and form an image signal; a focus detection means 21 to detect the focus state of the optical system on the basis of the image signal obtained by the imaging means; a first focus adjusting means 32 to adjust the focus position of the optical system by driving the optical system in an optical axis direction; a second focus adjusting means 33 to adjust the focus position of the optical system without driving the optical system in the optical axis direction; and a control means 21 to perform the wobbling operation by controlling the first focus adjusting means 32 to adjust the focus position of the optical system on the basis of the detection result obtained by the focus detection means, thereafter, controlling the second focus adjusting means 33 to adjust the focus position of the optical system. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lens barrel and an imaging apparatus.

  2. Description of the Related Art Conventionally, an imaging apparatus capable of capturing a moving image is known as an imaging apparatus provided with an interchangeable lens. As such an imaging apparatus, a focusing lens is moved in the optical axis direction of the imaging optical system. An image pickup apparatus capable of automatic focus adjustment for adjusting the focus of an optical system is disclosed (for example, see Patent Document 1). Note that an imaging apparatus capable of capturing such a moving image is generally provided with a sound collecting microphone for collecting sound during moving image shooting in the imaging apparatus body.

JP 2007-104316 A

  By the way, in an imaging apparatus capable of capturing a moving image, a wobbling operation for detecting the focus state while slightly changing the focal length may be performed in order to maintain a focused state with respect to the subject when the moving image is captured. It is common. In such a case, the imaging apparatus disclosed in Patent Document 1 performs a wobbling operation by micro-driving the focus adjustment lens. Therefore, a driving sound of the focus adjustment lens is generated during the wobbling operation. There is a problem that the drive sound is recorded as noise in a sound collecting microphone provided in the imaging apparatus.

  The problem to be solved by the present invention is to provide a lens barrel and an imaging apparatus capable of reducing operation noise during a wobbling operation.

  The present invention solves the above problems by the following means. In the following description, reference numerals corresponding to the drawings showing the embodiment of the present invention are given and described. However, the reference numerals are only for facilitating the understanding of the invention and are not intended to limit the invention. .

  [1] An imaging apparatus according to the present invention includes an imaging unit (22) that captures an image by an optical system to generate an image signal, and a focus state of the optical system based on the image signal obtained by the imaging unit. A focus detection means (21) for detecting the optical system, a first focus adjustment means (32) for adjusting the focal position of the optical system by driving the optical system in the optical axis direction, and the optical system as an optical axis. The second focus adjusting means (33) for adjusting the focal position of the optical system without driving in the direction, and the first focus adjusting means based on the detection result by the focus detecting means to control the first focus adjusting means. Control means (21) for performing a wobbling operation by adjusting the focus position of the optical system by controlling the second focus adjustment means after adjusting the focus position of the optical system. And

  [2] In the invention relating to the imaging apparatus, the focus adjustable range adjustable by the second focus adjusting means (33) is smaller than the focus adjustable range adjustable by the first focus adjusting means. Can be configured.

  [3] In the invention relating to the imaging apparatus, it may be configured to further include audio recording means (29) for recording audio.

  [4] In the invention relating to the imaging apparatus, the imaging means (22) can be configured to be able to shoot a moving image.

  [5] In the invention relating to the imaging apparatus, the second focus adjusting means (33) may be configured as a liquid lens capable of changing a curvature.

  [6] In the invention relating to the imaging apparatus, the second focus adjusting means (33) may be a refractive index variable member capable of changing a refractive index.

  [7] In the invention relating to the imaging apparatus, the lens barrel (3) can be configured to be detachable from the body body.

  [8] The lens barrel according to the present invention includes an optical system for forming a subject image, and a first focus for adjusting the focal position of the optical system by driving the optical system in the optical axis direction. It is characterized by comprising adjusting means (32) and second focus adjusting means (33) for adjusting the focal position of the optical system without driving the optical system in the optical axis direction.

  [9] In the invention related to the lens barrel, the focus adjustable range adjustable by the second focus adjusting means (33) is the focus adjustable range adjustable by the first focus adjusting means (32). Can be configured to be smaller.

  [10] In the invention related to the lens barrel, the second focus adjusting means (33) can be configured to be a liquid lens capable of changing the curvature.

  [11] In the invention related to the lens barrel, the second focus adjusting means (33) can be configured to be a refractive index variable member capable of changing a refractive index.

  According to the present invention, it is possible to reduce the operation sound during the wobbling operation.

FIG. 1 is a block diagram showing a digital camera 1 according to this embodiment. FIG. 2 is a flowchart showing the operation of the camera 1 according to this embodiment. FIG. 3 is a block diagram showing a digital camera 1a according to another embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a main part configuration diagram showing a digital camera 1 according to an embodiment of the present invention. A digital camera 1 according to the present embodiment (hereinafter simply referred to as a camera 1) includes a camera body 2 and a lens barrel 3, and the camera body 2 and the lens barrel 3 are detachably coupled by a mount unit 4. Yes.

  The lens barrel 3 is an interchangeable lens that can be attached to and detached from the camera body 2. As shown in FIG. 1, the lens barrel 3 includes a photographing optical system including lenses 31, 32, 33 and a diaphragm 35.

  The focus lens 32 is a lens for adjusting the focal length of the photographing optical system by moving in the direction of the optical axis L1. The focus lens 32 is provided so as to be movable along the optical axis L1 of the lens barrel 3, and While the position is detected, the position is adjusted by the focus lens drive motor 37.

  The specific configuration of the moving mechanism along the optical axis L1 of the focus lens 32 is not particularly limited. For example, a rotating cylinder is rotatably inserted into a fixed cylinder fixed to the lens barrel 3, a helicoid groove (spiral groove) is formed on the inner peripheral surface of the rotating cylinder, and the focus lens 32 is fixed. The end of the lens frame is fitted into the helicoid groove. Then, by rotating the rotating cylinder by the focus lens drive motor 37, the focus lens 32 fixed to the lens frame moves linearly along the optical axis L1.

  As described above, the focus lens 32 fixed to the lens frame by rotating the rotary cylinder with respect to the lens barrel 3 moves straight in the direction of the optical axis L1, but the focus lens drive motor 37 as its drive source is the lens. The lens barrel 3 is provided. The focus lens drive motor 37 and the rotary cylinder are connected by, for example, a transmission composed of a plurality of gears. When the drive shaft of the focus lens drive motor 37 is driven to rotate in any one direction, it is transmitted to the rotary cylinder at a predetermined gear ratio. Then, when the rotating cylinder rotates in any one direction, the focus lens 32 fixed to the lens frame moves linearly in any direction of the optical axis L1. When the drive shaft of the focus lens drive motor 37 is rotationally driven in the reverse direction, the plurality of gears constituting the transmission also rotate in the reverse direction, and the focus lens 32 moves straight in the reverse direction of the optical axis L1. .

  The position of the focus lens 32 is detected by the encoder 36. As described above, the position of the focus lens 32 in the optical axis L1 direction correlates with the rotation angle of the rotating cylinder, and can be obtained by detecting the relative rotation angle of the rotating cylinder with respect to the lens barrel 3, for example.

  As the encoder 36 of the present embodiment, an encoder that detects the rotation of a rotating disk coupled to the rotational drive of the rotating cylinder with an optical sensor such as a photo interrupter and outputs a pulse signal corresponding to the number of rotations, or a fixed cylinder And the contact point of the brush on the surface of the flexible printed wiring board provided on either one of the rotating cylinders, and the brush contact provided on the other, the amount of movement of the rotating cylinder (in either the rotational direction or the optical axis direction) A device that detects a change in the contact position according to the detection circuit using a detection circuit can be used.

  The focus lens 32 can move in the direction of the optical axis L1 from the end on the camera body side (also referred to as the closest end) to the end on the subject side (also referred to as the infinite end) by the rotation of the rotating cylinder described above. it can. Incidentally, the current position information of the focus lens 32 detected by the encoder 36 is sent to the camera control unit 21 to be described later via the lens control unit 39, and the focus lens drive motor 37 calculates the focus calculated based on this information. The driving position of the lens 32 is driven by a command signal sent from the camera control unit 21 via the lens control unit 39.

  The liquid lens 33 is a lens formed by filling a transparent thin film member that can be elastically deformed with a liquid such as water, oil such as silicone oil, or alcohol. The liquid lens 33 is filled inside the lens by the curvature changing means 38. The curvature can be changed by changing the amount or pressure of the liquid. Like the focus lens 32, the liquid lens 33 is a lens for adjusting the focal length of the photographing optical system by changing its curvature, but unlike the focus lens 32, the liquid lens 33 does not move in the optical axis L1 direction. Thus, it is arranged in a state fixed to the lens frame.

  Further, the curvature changing means 38 is not particularly limited and may be anything that can change the amount or pressure of the liquid filled in the liquid lens 33. For example, the curvature changing means 38 is connected to the liquid lens 33. A configuration in which the amount or pressure of the liquid filled in the liquid lens 33 can be changed by operating the cylinder, and the like. Can be mentioned.

  Then, when liquid is injected into the liquid lens 33 by the curvature changing means 38 and pressurized, the thin film member on the subject side among the thin film members forming the outer surface of the liquid lens 33 is shown in FIG. When the thin film member on the photographer side deforms convexly toward the photographer side (arrow a2), the liquid lens 33 is in a state indicated by a broken line. . On the other hand, when the curvature changing means 38 performs a process of reducing the pressure of the liquid injected into the liquid lens 33, the thin film member on the subject side is deformed toward the photographer side (arrow b1), and the photographer When the thin film member on the side is deformed toward the subject side (arrow b2), the liquid lens 33 returns to the state indicated by the solid line. In this way, the liquid lens 33 is configured such that the curvature changes by changing the amount or pressure of the liquid filled in the lens by the curvature changing means 38, and thus the curvature is changed. By changing the focal length, the focal length of the photographic optical system is adjusted.

  In the present embodiment, the liquid lens 33 is a lens used for performing focus adjustment in a wobbling operation for detecting a focus state while minutely changing a focal length performed during moving image shooting, as will be described later. The focus adjustable range by the liquid lens 33 is set to be smaller than the focus adjustable range by the focus lens 32.

  The diaphragm 35 is configured such that the aperture diameter around the optical axis L1 can be adjusted in order to limit the amount of light flux that passes through the photographing optical system and reaches the image sensor 22 and adjust the amount of blur. The adjustment of the aperture diameter by the diaphragm 35 is performed, for example, by sending an appropriate aperture diameter calculated in the automatic exposure mode from the camera control unit 21 via the lens control unit 39. Further, the set aperture diameter is input from the camera control unit 21 to the lens control unit 39 by a manual operation by the operation unit 27 provided in the camera body 2. The aperture diameter of the aperture 35 is detected by an aperture sensor (not shown), and the lens controller 39 recognizes the current aperture diameter.

  On the other hand, the camera body 2 is provided with an imaging element 22 that receives the light beam from the photographing optical system on the optical axis L1 and on the planned focal plane of the photographing optical system. The image sensor 22 is composed of a device such as a two-dimensional CCD image sensor, a MOS sensor, or a CID, and converts the received optical signal into an analog image signal. The analog image signal generated by the image sensor 22 is transmitted to an AFE (Analog front end) circuit 28.

  An AFE (Analog front end) circuit 28 receives the analog image signal output from the image sensor 22 and performs gain adjustment by amplifying the analog image signal in accordance with the ISO sensitivity. The AFE circuit 28 also includes an A / D converter. The A / D converter converts the analog image signal after gain adjustment into a digital image signal and transmits the digital image signal to the camera control unit 21.

  The camera body 2 is provided with an observation optical system for observing an image picked up by the image pickup device 22. The observation optical system of the present embodiment includes an electronic viewfinder (EVF) 25 composed of a liquid crystal display element, a liquid crystal drive circuit 24 that drives the viewfinder, and an eyepiece lens 26. The liquid crystal drive circuit 24 reads captured image information captured by the image sensor 22 and sent to the camera control unit 21, and drives the electronic viewfinder 25 based on the read image information. As a result, the user can observe the current captured image through the eyepiece lens 26. In place of or in addition to the observation optical system using the optical axis L2, a liquid crystal display can be provided on the back surface of the camera body 2, and a captured image can be displayed on the liquid crystal display.

  The camera body 2 is provided with a sound collecting microphone 29. The sound collecting microphone 29 collects sound around the camera 1 and transmits the collected sound signal to the camera control unit 21.

  Further, the camera body 2 is provided with a camera control unit 21. The camera control unit 21 is electrically connected to the lens control unit 39 through an electric signal contact unit 41 provided in the mount unit 4, receives lens information from the lens control unit 39, and focuses on the lens control unit 39. Information for adjusting the focus of the optical system, such as the driving amount of the lens 32 and the amount of change in the curvature of the liquid lens 33, and information such as the aperture diameter of the aperture are transmitted.

  In addition to the above, the camera control unit 21 performs various image processing on the digital image signal sent from the AFE circuit 28, and the image signal after the image processing is stored in a memory 23 for recording the image signal, observation optics Each is transmitted to the liquid crystal drive circuit 24 for driving the system. In addition, when receiving the sound signal collected by the sound collecting microphone 29, the camera control unit 21 transmits the sound signal to the memory 23 in association with the image signal corresponding to the sound signal, and records it in the memory 23. The memory 23 can be either a removable card type memory or a built-in memory.

  Furthermore, the camera control unit 21 detects the focus state of the optical system based on the image signal obtained by the image sensor 22, and based on the focus state detection result, the driving amount of the focus lens 32 and the curvature of the liquid lens 33. Are determined and transmitted to the lens controller 39. In addition, the detection method of the focus state of the optical system in this embodiment will be described later.

  The operation unit 27 is a shutter release button or an input switch for the user to set various operation modes of the camera 1, and can switch between still image shooting mode / moving image shooting mode and the like. Various modes set by the operation unit 27 are sent to the camera control unit 21, and the operation of the entire camera 1 is controlled by the camera control unit 21.

  Next, an operation example of the camera 1 according to this embodiment will be described. FIG. 2 is a flowchart showing the operation of the camera 1 according to this embodiment. In the following, the operation when the shooting mode of the camera 1 is set to the “moving image shooting mode” will be described.

  First, in step S <b> 1, the camera control unit 21 determines whether or not the photographer has performed a moving image shooting start operation (for example, a pressing operation of a release button provided in the operation unit 27) via the operation unit 27. If the operation for starting moving image shooting is performed, the process proceeds to step S2. On the other hand, in other cases, the process waits in step S1 until the photographer performs an operation to start moving image shooting.

  In step S2, moving image shooting by the camera 1 is started based on a moving image shooting start operation by the photographer. Specifically, the operation of continuously acquiring image signals based on the subject image by the image sensor 22 and the sound collecting operation of the sound around the camera 1 by the sound collecting microphone 39 are started. The image signal acquired by the image sensor 22 is gain-adjusted by the AFE circuit 28 and converted into a digital image signal, and then transmitted to the control unit 21. Further, the audio signal collected by the sound collection microphone 39 is transmitted to the control unit 21. Then, the control unit 21 performs image processing on the digital image signal, and stores the image signal after the image processing in the memory 23 in a state in which these signals are associated with the sound signal collected by the sound collecting microphone 39.

  In step S3, the camera control unit 21 performs the detection operation of the focus state of the optical system by the contrast detection method by causing the image pickup device 22 to acquire an image signal while moving the focus lens 32 in the optical axis L1 direction. Execute. Specifically, the camera control unit 21 is obtained by the imaging element 22 at a predetermined sampling interval while moving the focus lens 32 by driving the focus lens drive motor 37 via the lens control unit 39. Acquired image signal. Then, the camera control unit 21 extracts a high frequency component from the image signal of the imaging region corresponding to a predetermined focus detection region (focus area) from the acquired image signal, integrates the high frequency component output, and calculates the contrast. The focus lens position where the evaluation value is maximized is detected. Then, the camera control unit 21 detects the focus lens position where the evaluation value of the contrast is the maximum as a focus position as a result of the detection of the focus state by such a contrast detection method, and the focus position where the focus lens 32 is detected. To move.

  In step S4, the camera control unit 21 determines whether or not the focus state detection operation in step S3 has ended and the focus lens 32 has been moved to the in-focus position. If the focus state detection operation is completed, the process proceeds to step S5. On the other hand, if the focus state detection operation has not ended, the process returns to step S3, and steps S3 to S4 are repeated until the focus state detection operation ends.

  In step S <b> 5, the camera control unit 21 executes the wobbling operation by causing the image sensor 22 to acquire an image signal while changing the curvature of the liquid lens 33. Specifically, the camera control unit 21 controls the curvature changing unit 38 via the lens control unit 39 to change the amount or pressure of the liquid filled in the liquid lens 33, so that the liquid lens The image signal obtained by the imaging element 22 is acquired at a predetermined sampling interval while changing the curvature of 33 and thereby changing the focal length minutely. The amount of change in the curvature of the liquid lens 33 in the wobbling operation is not particularly limited, but the amount of movement of the image plane is preferably within about ± 100 μm.

  And the camera control part 21 extracts a high frequency component from the image signal of the imaging area corresponding to a predetermined focus detection area | region (focus area) among the acquired image signals, and contrasts by integrating this high frequency component output. The focal length is adjusted by changing the curvature of the liquid lens 33 so that the contrast evaluation value is maintained at a maximum. By performing such a wobbling operation, even when the subject is a moving subject, it is possible to adjust the focal length in accordance with the movement of the subject, thereby maintaining an appropriate in-focus state.

  In step S <b> 6, the camera control unit 21 determines whether or not the photographer has performed an operation for ending moving image shooting (for example, pressing the release button provided in the operation unit 27) via the operation unit 27. If the operation for ending the moving image shooting is performed, the process proceeds to step S7, where the moving image shooting is ended, and the process returns to step S1. On the other hand, if the photographer has not finished moving image shooting, the process proceeds to step S8.

  In step S8, the camera control unit 21 determines subject disappearance. Note that the subject disappearance determination can be performed based on, for example, whether a point at which the contrast evaluation value is maximum is detected within the wobbling operation range as a result of the wobbling operation in step S5. That is, in this case, if the point at which the contrast evaluation value is maximum is detected within the wobbling operation range, it is determined that the subject has not disappeared, while the contrast evaluation value is maximum. If the point cannot be detected, it is determined that the subject has disappeared. As a result of the subject disappearance determination, if it is determined that the subject has not disappeared, the process returns to step S5 and the wobbling operation is continued. On the other hand, if it is determined that the subject has disappeared, the process returns to step S3, and the focus lens 32 is moved in the direction of the optical axis L1 again to execute the focus state detection operation of the optical system by the contrast detection method. The

  The camera 1 of this embodiment operates as described above.

  According to the present embodiment, the focus state detection operation of the optical system is performed by moving the focus lens 32 in the direction of the optical axis L1, and the wobbling operation after being brought into focus by this is performed by the liquid lens 33. Therefore, it is possible to reduce the operation sound due to the wobbling operation during moving image shooting. As a result of reducing the operation sound due to the wobbling operation, it is possible to effectively prevent the operation sound resulting from the wobbling operation from being recorded as noise on the sound collecting microphone, thereby enabling the movie shooting. It is possible to improve the quality of the recorded voice at the time.

  In addition, according to this embodiment, when adjusting the focus state of the optical system, the focus lens 32 having a relatively wide focus adjustable range and the liquid lens 33 having a relatively narrow focus adjustable range are provided. Since these are used and used properly, the image pickup apparatus 1 including these can be downsized. That is, for example, when only the liquid lens is used as a lens for adjusting the focus state of the optical system, the liquid lens is relatively large in order to increase the focus adjustable range of the liquid lens. As a result, the imaging apparatus itself is also increased in size. On the other hand, according to this embodiment, by using the focus lens 32 having a relatively wide focus adjustable range and the liquid lens 33 having a relatively narrow focus adjustable range, and using them separately, Such a problem can be effectively solved.

  The embodiment described above is described for facilitating the understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

  For example, in the above-described embodiment, the configuration in which the liquid lens 33 and the curvature changing unit 38 are provided in the lens barrel 3 is exemplified, but the installation position is not particularly limited, and as shown in FIG. The lens 33 and the curvature changing means 38 may be provided in the vicinity of the image sensor 22 of the camera body 2. However, it is preferable that the installation position of the liquid lens 33 be a portion where the light beams incident on the image sensor 22 are as parallel as possible from the viewpoint of suppressing a change in image magnification.

  Further, in the above-described embodiment, the configuration in which the wobbling operation is performed by using the liquid lens 33 and the curvature changing unit 38 and changing the curvature of the liquid lens 33 by the curvature changing unit 38 is exemplified. By using a refractive index variable member capable of changing the refractive index and a refractive index changing means for changing the refractive index of the refractive index variable member, and changing the refractive index of the refractive index variable member by the refractive index changing means. The wobbling operation may be performed.

As such a refractive index variable member, for example, electro-optic ceramics such as PLZT ((Pb, La) (Zr, Ti) O ₃ ) can be used. In this case, since the electro-optic ceramic has a property that the refractive index changes when a voltage is applied, the refractive index of the electro-optic ceramic is changed by applying a voltage to the electro-optic ceramic by the refractive index changing means. The wobbling operation can be performed by changing.

  Alternatively, as such a refractive index variable member, for example, a refractive index variable transparent resin whose refractive index changes by applying pressure such as polycarbonate can be used. In this case, since such a refractive index variable transparent resin has a property that the refractive index changes when pressure is applied, pressure is applied to the refractive index variable transparent resin by the refractive index changing means. Then, the wobbling operation can be performed by changing the refractive index of the refractive index variable transparent resin.

  Furthermore, in the above-described embodiment, an example in which the liquid lens 33 is used as the lens capable of changing the curvature has been described. However, a lens other than the liquid lens 33 that can change the curvature may be used. In the above-described embodiment, the liquid lens 33 is exemplified by a configuration using a lens whose curvature can be changed by changing the amount or pressure of the liquid filled in the lens. A liquid lens whose curvature can be changed by a method other than the above may be used, and further, a liquid lens whose optical path length can be changed may be used instead of the liquid lens 33 capable of changing the curvature.

DESCRIPTION OF SYMBOLS 1 ... Digital camera 2 ... Camera body 21 ... Camera control part 22 ... Image pick-up element 29 ... Sound collection microphone 3 ... Lens barrel 32 ... Focus lens 33 ... Liquid lens 36 ... Focus lens drive motor 38 ... Curvature change means 39 ... Lens control Part

Claims (11)

An imaging means for capturing an image by an optical system and generating an image signal;
A focus detection unit that detects a focus state of the optical system based on an image signal obtained by the imaging unit;
A first focus adjusting means for adjusting a focal position of the optical system by driving the optical system in an optical axis direction;
Second focus adjusting means for adjusting the focal position of the optical system without driving the optical system in the optical axis direction;
Based on the detection result by the focus detection unit, the first focus adjustment unit is controlled to adjust the focus position of the optical system, and then the second focus adjustment unit is controlled to control the focus position of the optical system. An image pickup apparatus comprising: control means for performing a wobbling operation by adjusting The imaging device according to claim 1,
An imaging apparatus characterized in that a focus adjustable range adjustable by the second focus adjusting means is smaller than a focus adjustable range adjustable by the first focus adjusting means. The imaging device according to claim 1 or 2,
An imaging apparatus, further comprising voice recording means for recording voice. In the imaging device according to any one of claims 1 to 3,
An image pickup apparatus capable of taking a moving image by the image pickup means. In the imaging device according to any one of claims 1 to 4,
The imaging apparatus, wherein the second focus adjusting unit is a liquid lens capable of changing a curvature. In the imaging device according to any one of claims 1 to 5,
2. The imaging apparatus according to claim 2, wherein the second focus adjusting means is a refractive index variable member capable of changing a refractive index. In the imaging device according to any one of claims 1 to 6,
An image pickup apparatus, wherein a lens barrel is detachably attached to a body body. An optical system for forming a subject image;
A first focus adjusting means for adjusting a focal position of the optical system by driving the optical system in an optical axis direction;
A lens barrel comprising: a second focus adjusting unit that adjusts a focal position of the optical system without driving the optical system in an optical axis direction. The lens barrel according to claim 8, wherein
The lens barrel characterized in that a focus adjustable range adjustable by the second focus adjusting means is smaller than a focus adjustable range adjustable by the first focus adjusting means. The lens barrel according to claim 8 or 9,
The lens barrel characterized in that the second focus adjusting means is a liquid lens capable of changing a curvature. In the lens barrel according to any one of claims 8 to 10,
2. The lens barrel according to claim 2, wherein the second focus adjusting means is a refractive index variable member capable of changing a refractive index.

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