Abstract:
A lens barrel: an optical system; a focusing manipulation unit capable of changing a focal position of the optical system in a normal photographing area and in a macro photographing area where the focal position can be changed for an object located at a position shorter than a shortest distance position of the normal photographing area; a photographing mode switching unit for switching between a normal photographing mode and a macro photographing mode; and an index ring having a normal scale and a macro scale, the normal scale indicating an object distance in the normal photographing mode, and the macro scale indicating the object distance in the macro photographing mode. Then, the photographing mode switching unit switches a display position of the index ring between the normal scale and the macro scale, and the focusing manipulation unit changes the focal position displayed on the index ring by rotation manipulation.

Description:
TECHNICAL FIELD 
       [0001]    The present disclosure relates to a lens barrel and an imaging apparatus. 
       BACKGROUND ART 
       [0002]    PTL 1 discloses a lens barrel in which a movement permissible range of a focus ring is adjusted by a lock member provided at a zoom ring. 
       CITATION LIST 
     Patent Literature 
       [0000]    
       
         PTL 1: Unexamined Japanese Patent Publication No. S57-66425 
       
     
       SUMMARY OF THE INVENTION 
       [0004]    The present disclosure provides a lens barrel capable of switching between normal photographing and macro photographing and an imaging apparatus provided with the lens barrel. The lens barrel is capable of displaying a scale of a focus ring, and is capable of displaying a photographing distance range during the normal photographing and a photographing distance range during the macro photographing within the same movement permissible range of the focus ring. 
         [0005]    A lens barrel in the present disclosure includes: an optical system formed of a plurality of lenses; a focusing manipulation unit capable of changing a focal position of the optical system in a normal photographing area and in a macro photographing area where the focal position can be changed for an object located at a position shorter than a shortest distance position of the normal photographing area; a photographing mode switching unit for switching between a normal photographing mode and a macro photographing mode by moving at least a part of lenses among the plurality of lenses of the optical system; and an index ring having a normal scale and a macro scale, the normal scale indicating an object distance in the normal photographing mode, and a macro scale provided at a position different from the position of the normal scale and indicating the object distance in the macro photographing mode. Then, the photographing mode switching unit switches a display position of the index ring between the normal scale and the macro scale, and the focusing manipulation unit changes the focal position displayed on the index ring by rotation manipulation. 
         [0006]    A lens barrel comprised an imaging apparatus in the present disclosure includes: an optical system formed of a plurality of lenses; a focusing manipulation unit capable of changing a focal position of the optical system in a normal photographing area and in a macro photographing area where the focal position can be changed for an object located at a position shorter than a shortest distance position of the normal photographing area; a photographing mode switching unit for switching between a normal photographing mode and a macro photographing mode by moving at least a part of lenses among the plurality of lenses of the optical system; and an index ring having a normal scale and a macro scale, the normal scale indicating an object distance in the normal photographing mode, and the macro scale provided at a position different from the position of the normal scale and indicating the object distance in the macro photographing mode. Then, the photographing mode switching unit switches a display position of the index ring between the normal scale and the macro scale, and the focusing manipulation unit changes the focal position displayed on the index ring by rotation manipulation. 
         [0007]    The lens barrel in the present disclosure is capable of switching between normal photographing and macro photographing, is capable of displaying a scale of a focus ring, and is capable of displaying a focal position range during the normal photographing and a focal position range during the macro photographing while keeping a movement permissible range of the focus ring constant. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0008]      FIG. 1  is a perspective view of a digital camera in a first exemplary embodiment. 
           [0009]      FIG. 2  is a schematic diagram illustrating a sectional configuration of a lens barrel in a normal mode according to the first exemplary embodiment. 
           [0010]      FIG. 3  is a schematic diagram illustrating a sectional configuration of the lens barrel in a macro mode according to the first exemplary embodiment. 
           [0011]      FIG. 4A  is a diagram illustrating a focus index of an index ring in the normal mode according to the first exemplary embodiment. 
           [0012]      FIG. 4B  is a diagram of a case where the focus index indicates an auto focus mode in the normal mode according to the first exemplary embodiment. 
           [0013]      FIG. 4C  is a diagram of a case where the focus index indicates a short distance in the normal mode according to the first exemplary embodiment. 
           [0014]      FIG. 5A  is a diagram illustrating a focus index of the index ring in the macro mode according to the first exemplary embodiment. 
           [0015]      FIG. 5B  is a diagram of a case where the focus index indicates an auto focus mode in the macro mode according to the first exemplary embodiment. 
           [0016]      FIG. 5C  is a diagram of a case of indicating a focus index short distance in the macro mode according to the first exemplary embodiment. 
           [0017]      FIG. 6A  is a partial developed view of a fixed frame in the first exemplary embodiment. 
           [0018]      FIG. 6B  is a partial developed view of a cam frame in the first exemplary embodiment. 
           [0019]      FIG. 7A  is a partial developed view of a focus ring in the first exemplary embodiment. 
           [0020]      FIG. 7B  is a diagram explaining a configuration of the index ring in the first exemplary embodiment. 
           [0021]      FIG. 8  is a schematic diagram illustrating a sectional configuration of a lens barrel in an imaging apparatus according to a second exemplary embodiment. 
       
    
    
     DESCRIPTION OF EMBODIMENTS 
       [0022]    Hereinafter, exemplary embodiments will be described in detail while appropriately referring to the drawings. However, unnecessarily detailed description may be omitted. For example, detailed description of a matter that has been already well-known or overlapping description of substantially the same configuration may be omitted. This is to avoid unnecessary redundancy of the following description and to be easily understood by those skilled in the art. 
         [0023]    The accompanying drawings and the following description are provided so that those skilled in the art fully understand the present disclosure. It is not intended that a subject described in the claims be limited by these drawings and description. 
       First Exemplary Embodiment 
     1-1. Configuration of Digital Camera 
       [0024]      FIG. 1  is a perspective view of digital camera  100 . Digital camera  100  has camera body  110  and lens barrel  120 . Lens barrel  120  may be configured integrally with camera body  110  or may be provided detachably. Further, iris ring  121 , focus ring  122 , and macro ring  123 , which are manipulated by a user, are provided on an outer periphery of lens barrel  120 . Digital camera  100  is one example of an imaging apparatus, and focus ring  122  is one example of a focusing manipulation unit. 
         [0025]    Next, a configuration of lens barrel  120  will be described.  FIG. 2  is a schematic diagram illustrating a sectional configuration of lens barrel  120  in a normal mode.  FIG. 3  is a schematic diagram illustrating a sectional configuration of lens barrel  120  in a macro mode. 
         [0026]    Lens barrel  120  includes first lens group L 1 , focus lens group L 2 , third lens group L 3 , fourth lens group L 4 , iris ring  121 , focus ring  122 , macro ring  123 , fixed frame  130 , rectilinear frame  140 , base frame  150 , three-group holding frame  160 , focus lens frame  170 , guide shaft  171 , index ring  180 , cam frame  124 , index ring driving pin  182 , cam frame driving pin  125 , and decorative ring  190 . Rectilinear frame  140  has rectilinear frame driving pin  141  protruded to an outer peripheral side. Cam frame  124  is engaged with macro ring  123  via cam frame driving pin  125 . 
         [0027]    Lens barrel  120  is configured in such a manner that the respective members are mounted to base frame  150 . Base frame  150  holds fourth lens group L 4 . Fixed frame  130  is screwed to an object side of base frame  150  (not illustrated). 
         [0028]    Next, the members provided on an inner peripheral side of fixed frame  130  will be described. On the inner peripheral side of fixed frame  130 , rectilinear frame  140  is movably mounted in an optical axis X direction. Specifically, rectilinear frame driving pin  141  protruded to the outer peripheral side of rectilinear frame  140  is engaged with cam frame  124  and fixed frame  130 . By rotation operation of macro ring  123 , cam frame  124  is rotated, and rectilinear frame  140  is moved in the optical axis X direction. 
         [0029]    Rectilinear frame  140  holds first lens group L 1 . Further, three-group holding frame  160  is fixed to rectilinear frame  140 . Three-group holding frame  160  holds third lens group L 3 . Rectilinear frame  140  is provided with guide shaft  171 . Focus lens frame  170  is mounted movably in the optical axis X direction on guide shaft  171  provided at rectilinear frame  140 . Focus lens frame  170  holds focus lens group L 2 . Focus lens frame  170  is engaged with guide shaft  171  held parallel to optical axis X by rectilinear frame  140 , and is driven in the optical axis X direction by a power source (not illustrated), such as an actuator. 
         [0030]    Next, the members provided on an outer peripheral side of fixed frame  130  will be described. Fixed frame  130  includes iris ring  121 , focus ring  122 , macro ring  123 , index ring  180 , and decorative ring  190 . Iris ring  121  is rotatable with respect to fixed frame  130  in a circumferential direction of lens barrel  120  according to user&#39;s manipulation. Focus ring  122  is rotatable with respect to fixed frame  130  in the circumferential direction of lens barrel  120  according to user&#39;s manipulation. Macro ring  123  is rotatable with respect to fixed frame  130  in the circumferential direction of lens barrel  120  according to user&#39;s manipulation. 
       1-2. Operation of Digital Camera 
       [0031]    Operation of digital camera  100  configured as above will be described. Digital camera  100  is configured in such a manner that a photographable object distance range is changed by switching between a normal mode (normal photographing mode) and a macro mode (macro photographing mode). In the present exemplary embodiment, the normal mode is a photographing mode suitable for a case where a distance to an object is in a range from 0.3 m to ∞ inclusive, and the macro mode is a photographing mode suitable for a case where the distance to the object is from 0.15 m to 0.35 m inclusive. As illustrated in  FIGS. 4A to 4C  and  FIGS. 5A to 5C , digital camera  100  adjusts a position of index ring  180  in the optical axis X direction in response to switching between the normal mode and the macro mode. 
         [0032]      FIGS. 4A to 4C  illustrate positional relations among macro ring  123 , cam frame groove  124 A for a rectilinear frame, cam frame groove  124   b  for an index ring, and index ring  180  in the normal mode.  FIG. 4A  is a diagram illustrating a focus index of index ring  180 ,  FIG. 4B  is a diagram of a case where the focus index indicates an auto focus mode, and  FIG. 4C  is a diagram of a case where the focus index indicates a short distance. 
         [0033]      FIGS. 5A to 5C  illustrate positional relations among macro ring  123 , cam frame groove  124 A for a rectilinear frame, cam frame groove  124   b  for an index ring, and index ring  180  in the macro mode.  FIG. 5A  is a diagram illustrating a focus index of index ring  180 ,  FIG. 5B  is a diagram of a case where the focus index indicates an auto focus mode, and  FIG. 5C  is a diagram of a case where the focus index indicates a short distance. 
         [0034]    As illustrated in  FIGS. 4A to 4C  and  FIGS. 5A to 5C , the focus index indicating an object distance is printed on an exterior surface of index ring  180 . On an upper stage (the object side) in the optical axis X direction, an object distance range (e.g., from 0.3 m to ∞ m inclusive, and its feet equivalent distance) during photographing in the normal mode is displayed as normal scale  181   a . Further, on a lower stage (the camera body side) of index ring  180 , an object distance range (e.g., from 0.15 m to 0.35 m inclusive, and its feet equivalent distance) during photographing in the macro mode is displayed as macro scale  181   b . Here, shortest distances (0.3 m in the normal mode and 0.15 m in the macro mode) and longest distances (∞ in the normal mode and 0.35 m in the macro mode) are located in the same phase of index ring  180  in the circumferential direction. “AF” (the upper stage) indicating an auto focus mode in the normal mode and “AF” (the lower stage) indicating an auto focus mode in the macro mode are also displayed at the same phase position of index ring  180  in the circumferential direction. In the present exemplary embodiment, the notation “AF” of the auto focus mode is provided so as to be adjacent to a longest distance side (“∞” or the like). However, the present invention is not limited to this, and the notation “AF” may be provided on a shortest distance side (“0.3” or the like). When the focus index is set to “AF”, the auto focus mode in each mode is set. In the auto focus mode, a user can perform automatic focusing regardless of the object distance. 
         [0035]    Further, an index “NORMAL” indicating the normal mode and an index “MACRO” indicating the macro mode are printed on an exterior of macro ring  123 . 
         [0036]    As described above, index ring  180  has normal scale  181   a  and macro scale  181   b  arranged in two stages in the optical axis X direction. According to user&#39;s rotation manipulation of macro ring  123 , index ring  180  can be driven with respect to fixed frame  130  in the optical axis X direction, and marks of normal scale  181   a  and macro scale  181   b  are switched. In other words, when macro ring  123  is rotated in a left direction by user&#39;s manipulation and the “NORMAL” mark of macro ring  123  is located on an upper surface, normal scale  181   a  is displayed between focus ring  122  and decorative ring  190 . Further, when macro ring  123  is rotated in a right direction by the user&#39;s manipulation and the “MACRO” mark of macro ring  123  is located on the upper surface, macro scale  181   b  is displayed between focus ring  122  and decorative ring  190 . 
         [0037]    Further, according to user&#39;s rotation manipulation of focus ring  122 , index ring  180  is rotatable with respect to fixed frame  130  in the circumferential direction of lens barrel  120 . It should be noted that rotatable ranges of iris ring  121 , focus ring  122 , and macro ring  123  are respectively set. The rotatable range will be described below. 
         [0038]      FIG. 6A  is a partial developed view of fixed frame  130 , and  FIG. 6B  is a partial developed view of cam frame  124 .  FIGS. 6A and 6B  are drawings viewed from the outer peripheral side. 
         [0039]    As illustrated in  FIG. 6A , fixed frame  130  has fixed frame groove  130   a  for a rectilinear frame with which rectilinear frame driving pin  141  is engaged, fixed frame groove  130   b  for an index ring with which index ring driving pin  182  is engaged, and cam frame rotation regulating groove  130   c  with which cam frame driving pin  125  is engaged. Fixed frame groove  130   a  for a rectilinear frame has a predetermined length in the optical axis X direction, and regulates movement of rectilinear frame  140  by engaging with rectilinear frame driving pin  141 . In other words, rectilinear frame  140  is allowed to move in the optical axis X direction only by a predetermined distance, and is regulated not to rotate in the circumferential direction by fixed frame groove  130   a  for a rectilinear frame. Fixed frame groove  130   b  for an index ring has a predetermined length in the optical axis X direction, and regulates movement of index ring  180  by engaging with index ring driving pin  182 . In other words, index ring  180  is allowed to move in the optical axis X direction only by a predetermined distance, and is regulated not to rotate in the circumferential direction by fixed frame groove  130   b  for an index ring. Cam frame rotation regulating groove  130   c  has a predetermined length in the circumferential direction, and regulates movement of cam frame  124  by engaging with cam frame driving pin  125 . In other words, cam frame  124  is allowed to rotate and move in the circumferential direction only by a predetermined distance, and is regulated not to move in the optical axis X direction by cam frame rotation regulating groove  130   c.    
         [0040]    As illustrated in  FIG. 6B , cam frame  124  has cam frame groove  124   a  for a rectilinear frame with which rectilinear frame driving pin  141  is engaged, cam frame groove  124   b  for an index ring with which index ring driving pin  182  is engaged, and cam frame driving pin  125 . Cam frame groove  124   a  for a rectilinear frame has a predetermined length in the optical axis X direction and in the circumferential direction, and regulates movement of rectilinear frame  140  by engaging with rectilinear frame driving pin  141 . In other words, by the rotational movement of cam frame  124 , rectilinear frame  140  is driven in the optical axis X direction only by a predetermined distance via rectilinear frame driving pin  141  engaged with cam frame groove  124   a  for a rectilinear frame. Cam frame groove  124   b  for an index ring has a predetermined length in the optical axis X direction and in the circumferential direction and regulates movement of index ring  180  by engaging with index ring driving pin  182 . In other words, by the rotational movement of cam frame  124 , index ring  180  is driven in the optical axis X direction only by a predetermined distance via index ring driving pin  182  engaged with cam frame groove  124   b  for an index ring. Cam frame driving pin  125  is fixed to cam frame  124  by a fixing member, such as a screw, or is configured as a protrusion integral with cam frame  124 . By engaging with macro ring  123 , cam frame driving pin  125  transmits rotational drive of macro ring  123  by user&#39;s manipulation to cam frame  124 . 
         [0041]    In this way, when the user rotationally manipulates macro ring  123 , cam frame  124  is rotated, rectilinear frame  140  is moved in the optical axis X direction, and index ring  180  is simultaneously moved in the optical axis X direction. A moving amount of rectilinear frame  140  in the optical axis X direction during the manipulation of macro ring  123  is determined by a length of cam frame groove  124   a  for a rectilinear frame in the optical axis X direction. Further, a moving amount of index ring  180  in the optical axis X direction is determined by a length of cam frame groove  124   b  for an index ring in the optical axis X direction. 
         [0042]    As mentioned above, since cam frame driving pin  125  is engaged with cam frame rotation regulating groove  130   c , a length of cam frame rotation regulating groove  130   c  extending in the circumferential direction of fixed frame  130  becomes a movable range of cam frame driving pin  125  in the circumferential direction. Moreover, since cam frame driving pin  125  is also engaged with macro ring  123 , movable ranges of macro ring  123  and cam frame  124  are determined by cam frame rotation regulating groove  130   c.    
         [0043]      FIG. 7A  is a partial developed view of focus ring  122 , and  FIG. 7B  is a partial developed view and side view of index ring  180 . The partial developed views of  FIGS. 7A and 7B  are seen from the outer peripheral side, and a shape on an inner peripheral side is indicated by broken lines. As illustrated in  FIG. 7A , focus ring  122  has index ring rotation regulating groove  122   a  extending in the optical axis X direction on the inner peripheral side. As illustrated in  FIG. 7B , index ring  180  has index ring rotation regulating protrusion  180   a  extending in the optical axis X direction, index ring optical axis regulating groove  180   b , and vertical groove  180   c  for assembling. Index ring rotation regulating protrusion  180   a  is engaged with index ring rotation regulating groove  122   a  of focus ring  122  illustrated in  FIG. 7A . With this configuration, movement of index ring  180  in the rotation direction is regulated. Index ring optical axis regulating groove  180   b  is a groove for not regulating the movement of index ring driving pin  182  in the circumferential direction in a case where index ring  180  is rotated along with rotation of focus ring  122 . In other words, index ring driving pin  182  receives a driving force from cam frame groove  124   b  for an index ring by the rotation of cam frame  124 , and drives index ring  180  in the optical axis X direction. However, depending on the rotation of index ring  180 , index ring driving pin  182  does not receive a force in the circumferential direction by moving index ring optical axis regulating groove  180   b . Vertical groove  180   c  for assembling is a groove for inserting index ring driving pin  182  during assembling. 
         [0044]    In this way, since index ring  180  is rotated according to the rotation of focus ring  122 , the focus index serving as an object distance corresponding to a rotation position of focus ring  122  is located on an upper surface of index ring  180 . 
       1-3. Switching Between Normal Mode and Macro Mode 
       [0045]    A user can switch between the normal mode and the macro mode by rotationally manipulating macro ring  123 . Macro ring  123  is one example of a photographing mode switching unit. 
       &lt;Normal Mode&gt; 
       [0046]    As illustrated in  FIGS. 4A to 4C , when macro ring  123  is rotated in the left direction and the notation of “NORMAL” indicated on macro ring  123  is moved to an upper center of lens barrel  120 , the normal mode is set. When macro ring  123  is rotationally driven in the left direction, cam frame driving pin  125  engaged with macro ring  123  and fixed to cam frame  124  is moved along cam frame rotation regulating groove  130   c . When cam frame driving pin  125  abuts on a left end of cam frame rotation regulating groove  130   c , rotational movement of macro ring  123  is regulated, and the notation of “NORMAL” indicating the normal mode is located on the upper center of lens barrel  120 . 
         [0047]    When macro ring  123  is rotationally driven in the left direction, cam frame  124  is rotated in the left direction via cam frame driving pin  125  engaged with macro ring  123 . When cam frame  124  is rotated in the left direction, rectilinear frame driving pin  141  is moved along cam frame groove  124   a  for a rectilinear frame of cam frame  124  engaged with rectilinear frame driving pin  141 , and index ring driving pin  182  is moved along cam frame grave  124   b  for an index ring of cam frame  124  engaged with index ring driving pin  182 . Rectilinear frame driving pin  141  and index ring driving pin  182  reach the respective grooves on the camera body side (right end) ( FIG. 6B ). Accordingly, in the normal mode, as illustrated in  FIG. 2 , rectilinear frame  140  and index ring  180  are held in fixed frame  130  in a state of being located on the camera body side. When rectilinear frame  140  is located on the camera body side, the lens groups held by the rectilinear frame  140  are located on the camera body side and become optical system arrangement in the normal mode. As illustrated in  FIGS. 4A to 4C , when index ring  180  is located on the camera body side, normal scale  181   a  serving as a focus index for the normal mode is displayed between focus ring  122  and decorative ring  190 . 
       &lt;Macro Mode&gt; 
       [0048]    As illustrated in  FIGS. 5A to 5C , when the user rotates macro ring  123  in the right direction and the notation of “MACRO” indicated on macro ring  123  is moved to the upper center of lens barrel  120 , the macro mode is set. When macro ring  123  is rotationally driven in the right direction, cam frame driving pin  125  engaged with macro ring  123  and fixed to cam frame  124  is moved along cam frame rotation regulating groove  130   c . When cam frame driving pin  125  abuts on a right end of cam frame rotation regulating groove  130   c , rotational movement of macro ring  123  is regulated, and the notation of “MACRO” indicating the macro mode is located on the upper center of lens barrel  120 . 
         [0049]    When macro ring  123  is rotationally driven in the right direction, cam frame  124  is rotated in the right direction via cam frame driving pin  125  engaged with macro ring  123 . When cam frame  124  is rotated in the right direction, rectilinear frame driving pin  141  is moved along cam frame groove  124   a  for a rectilinear frame of cam frame  124  engaged with rectilinear frame driving pin  141 , and index ring driving pin  182  is moved along cam frame grave  124   b  for an index ring of cam frame  124  engaged with index ring driving pin  182 . Rectilinear frame driving pin  141  and index ring driving pin  182  reach the respective grooves on the object side (left end). Accordingly, in the macro mode, as illustrated in  FIG. 3 , rectilinear frame  140  and index ring  180  are held in fixed frame  130  in a state of being moved to the object side. When rectilinear frame  140  is located on the object side, the lens groups held by rectilinear frame  140  are located on the object side and become optical system arrangement in the macro mode. As illustrated in  FIGS. 5A to 5C , when index ring  180  is located on the object side, macro scale  181   b  serving as a focus index for the macro mode is displayed between focus ring  122  and decorative ring  190 . 
       1-4. Movable Ranges of Index Ring and Focus Ring 
       [0050]    As mentioned above, index ring  180  is driven in the optical axis X direction and switching between the normal mode and the macro mode is performed by switching the rotation of macro ring  123 . 
         [0051]    On the other hand, index ring  180  is rotationally moved in the circumferential direction according to rotation manipulation of focus ring  122 , and position regulation of index ring  180  in the circumferential direction is realized by engaging index ring rotation regulating protrusion  180   a  with index ring rotation regulating groove  122   a  of focus ring  122 . In the present exemplary embodiment, a rotation movable range of focus ring  122 , i.e., a rotation movable range of index ring  180 , is realized by contact of a protrusion (not illustrated) provided at fixed frame  130  with a protrusion (not illustrated) provided at focus ring  122 . 
         [0052]    In the normal mode, when focus ring  122  is rotated to abut on an end on the long distance side, index ring  180  is rotated to the position indicating the auto focus “AF” ( FIG. 4B ). On the contrary, when focus ring  122  is rotated to abut on an end on the short distance side, index ring  180  is rotated to the position of “0.3” indicating 0.3 m ( FIG. 4C ). 
         [0053]    In the macro mode, when focus ring  122  is rotated to abut on an end on the long distance side, index ring  180  is rotated to the position indicating the auto focus “AF” ( FIG. 5B ). On the contrary, when focus ring  122  is rotated to abut on an end on the short distance side, index ring  180  is rotated to the position of “0.15” indicating 0.15 m ( FIG. 5C ). 
       1-5. Effects 
       [0054]    As described above, in the present exemplary embodiment, index ring  180  is displaced in the optical axis X direction during the switching between the normal mode and the macro mode by the user. Additionally, index ring  180  is rotated in the circumferential direction according to the manipulation of focus ring  122  by the user. 
         [0055]    With this configuration, only a photographable object distance range according to the mode is indicated on index ring  180 . Accordingly, the object distance can be also displayed with index ring  180  on lens barrel  120  provided with mode switching. 
       Second Exemplary Embodiment 
       [0056]      FIG. 8  is a schematic diagram illustrating a sectional configuration of lens barrel  220  in an imaging apparatus according to a second exemplary embodiment. In addition to the configuration of lens barrel  120  in the first exemplary embodiment, lens barrel  220  in the present exemplary embodiment has rectilinear guide  235  and dustproof sheets  285 ,  286 . Since the other configuration is the same as the configuration of lens barrel  120 , description is omitted. 
         [0057]    As illustrated in  FIG. 8 , in lens barrel  220 , rectilinear guide  235  is provided on an outer peripheral side of fixed frame  130  and on inner peripheral sides of focus ring  122  and index ring  180 . Rectilinear guide  235  guides index ring  180  to move between focus ring  122  and decorative ring  190  in an optical axis X direction. 
         [0058]    Further, as illustrated in  FIG. 8 , dustproof sheet  285  is provided between index ring  180  and focus ring  122  in a circumferential direction. Dustproof sheet  285  suppresses entry of foreign matter into lens barrel  220  from an opening between index ring  180  and focus ring  122  on an object side of index ring  180 . 
         [0059]    Further, as illustrated in  FIG. 8 , dustproof sheet  286  is provided between fixed frame  130  and decorative ring  190  in the circumferential direction and is provided between index ring  180  and decorative ring  190  in the optical axis X direction. Dustproof sheet  286  suppresses entry of foreign matter into lens barrel  220  from between index ring  180  and decorative ring  190  on a camera body side of index ring  180 . 
       Other Exemplary Embodiments 
       [0060]    As described above, exemplary embodiments are described as illustration of the technology disclosed in the present application. However, the technology in the present disclosure is not limited to this, and is appropriately applicable to exemplary embodiments where modifications, replacements, additions, omissions, or the like have been made. Further, a new exemplary embodiment can be made by combining the respective components described in the above-described exemplary embodiments. 
         [0061]    As described above, the exemplary embodiments have been described as illustration of the technology in the present disclosure. The accompanying drawings and detailed description have been provided for the illustration. 
         [0062]    Therefore, not only the components which are essential for solving the problem, but also the components which are not essential for solving the problem to illustrate the above-described technology can be included in the components described in the accompanying drawings and the detailed description. Accordingly, when those nonessential components are described in the accompanying drawings and the detailed description, those nonessential components should not be immediately recognized as essential components. 
         [0063]    Further, since the aforementioned exemplary embodiments illustrate the technology in the present disclosure, various modifications, replacements, additions, omissions, or the like can be made within the claims and their equivalents. 
       INDUSTRIAL APPLICABILITY 
       [0064]    The present disclosure is applicable to a lens barrel used in an imaging apparatus. Specifically, the present disclosure is applicable to a digital still camera, a single lens reflex camera, a mirrorless camera, and the like.