JP4974961B2 - Lens barrel - Google Patents

Description

  The present invention relates to a lens barrel provided with a lens extension mechanism that moves and adjusts a lens group in the optical axis direction.

  In recent years, zoom lens barrels mounted on optical devices such as cameras tend to increase the amount of movement of the lens group in the optical axis direction in order to support high-magnification zoom.

  However, a camera equipped with a zoom lens barrel is required to be downsized.

  In view of this, in the conventional zoom lens barrel, a lens feeding mechanism has been proposed in which the length of the cam barrel in the optical axis direction is shortened while ensuring the amount of movement of the lens that is moved inside the barrel.

  In the lens extension mechanism of this conventional zoom lens barrel, a second group guide cam groove is formed on the inner peripheral surface of the cam ring in order to move the second group lens inside the barrel. In this cam groove, a pair of front cam grooves and rear cam grooves having the same basic locus are arranged at different positions in the optical axis direction. The pair of front cam grooves and rear cam grooves are configured to cover the entire area of the basic locus.

  In the lens payout mechanism configured as described above, when the second group lens is moved inside the lens barrel, only the rear cam follower and the rear cam groove located at the rear at the front moving end of the second group lens moving frame with respect to the cam ring. Engage. At the same time, in this lens payout mechanism, only the front cam follower and the front cam groove positioned at the front are engaged at the rear moving end.

  On the other hand, three first group guide cam grooves are formed on the outer peripheral surface of the cam ring, and three first group rollers (cam followers) projecting in the inner diameter direction of the first outer cylinder to which the first group lens is fixed. It is mated.

Thus, in the conventional lens payout mechanism, the cam ring is positioned inside the first outer cylinder. A second group guide cam groove is provided on the inner peripheral surface of the cam ring. Further, in the second group guide cam groove, the front cam groove and the rear cam groove are arranged at different positions in the optical axis direction. Thus, in the conventional lens payout mechanism, the amount of movement of the second group lens moving frame in the optical axis direction is made larger than the length of the cam ring in the same direction (for example, see Patent Document 1).
Japanese Patent No. 3863829

  However, in the conventional lens feeding mechanism described above, the cam ring is provided inside the first outer cylinder in order to provide the second group guide cam groove, which is the front cam groove and the rear cam groove, on the inner peripheral surface of the cam ring. It is arranged. For this reason, the length of the cam ring in the optical axis direction is shorter than the length of the first outer cylinder in the optical axis direction, and the second group lens moving frame guided by the second group guide cam groove formed on the inner peripheral surface. The amount of movement in the optical axis direction is also reduced.

  An object of the present invention is to provide a lens barrel in which the amount of movement in the optical axis direction of a lens group moved inside the lens barrel can be further increased.

In order to achieve the above object, a lens barrel according to claim 1 includes a first moving member that holds a lens, and a first cam that engages with a first cam follower portion of the first moving member . A first cam member provided with a groove and capable of moving the first moving member in an optical axis direction along a locus of the first cam groove in the first drive region; and the first moving member. And a second cam groove that engages with a second cam follower portion of the second moving member, and the locus of the second cam groove in the second drive region And a second cam member capable of moving the second moving member in the optical axis direction along the optical axis, wherein the first moving member is independent in the first drive region. Moveable, and in the second drive region, the first moving member and the first driving member The moving member of the first cam follower is engaged with the first cam groove when moving from the first driving region to the second driving region. The second cam follower portion that has been detached from the first cam groove and has been separated from the second cam groove is engaged with the second cam groove, and the second drive region is disengaged from the second drive region. When moving to the first drive region, the second cam follower portion engaged with the second cam groove is detached from the second cam groove and also detached from the first cam groove. Further, the first cam follower portion is engaged with the first cam groove .

  According to the lens barrel of the present invention, the movement range in the optical axis direction of the lens group moved inside the barrel is set across the cam mechanism of the first cam member and the cam mechanism of the second cam member. By doing so, there is an effect that the amount of movement of the lens group can be increased.

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

  FIG. 1 is a cross-sectional view showing a storage state of a zoom lens barrel according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing the WIDE state of the zoom lens barrel according to the embodiment of the present invention. FIG. 3 is a cross-sectional view showing a TELE state of the zoom lens barrel according to the embodiment of the present invention.

  In FIG. 1 to FIG. 3, 1 is a first group lens located closest to the object side, 2 is a second group lens located on the image plane side with respect to the first group lens 1, 3 is a focus lens, and 4 is a lens 1. 1 group cylinder. Three cam followers 4a are provided on the circumference of the first group cylinder 4 at different positions in the circumferential direction. At the same time, on the circumference of the first group cylinder 4, two convex portions 4 b for rectilinear guides are provided at different positions in the circumferential direction. A front cover member 5 and a first group cap member 6 are fixed to the first group cylinder 4.

  The second group lens 2 is held by a lens holding member 7. The lens holding member 7 is held by a second group holding member (first moving member) 8 so as to be movable in a plane perpendicular to the optical axis. The second group holding member 8 includes a light quantity switching unit, a shutter unit, and a driving unit for driving the lens holding member 7 in a plane perpendicular to the optical axis, which are configured by a known technique. (Details of each unit are not shown) The second group holding member 8 is provided with a cam pin follower portion 8a, a cam pin side surface portion 8b, and a hook portion 8c.

  The second group holding member 8 is provided with three cam pin follower portions 8a and cam pin side surface portions 8b at different positions in the circumferential direction. The second group holding member 8 is provided with three hook portions 8c at different positions in the circumferential direction.

  The moving base member (second moving member) 9 is provided with a cam pin follower portion 9a, a cam pin side surface portion 9b, and a hook portion 9c. The cam pin follower portion 9a and the cam pin side surface portion 9b are provided at three positions with different positions in the circumferential direction of the movable base member 9, respectively. Further, the hook portion 9c is provided at three positions with different positions in the circumferential direction of the moving base member 9. Further, in the first group cylinder 4, a spring member 10 is laid between the hook portion 8 c of the second group holding member 8 and the hook portion 9 c of the moving base member 9 so as to be biased in a direction to be positioned at the initial position. .

  FIG. 12 is a front view of a state in which the spring member 10 is installed on the second group holding member 8 and the movable base member 9. The second group holding member 8 can be incorporated into the movable base member 9 from the front direction of the paper surface of FIG.

  In the first group cylinder 4, the focus lens 3 is held by the lens holding member 11, and is mounted so as to be controllable in the optical axis direction by a driving mechanism (not shown).

  A first cam cylinder (first cam member) 12 is disposed on the outer peripheral side of the first group cylinder 4. The first cam cylinder (first cam member) 12 is provided with a cam follower 12a and a drive pin 12b.

  The first cam cylinder 12 is configured to have a length in the optical axis direction such that the front surface of the first cam cylinder 12 is substantially at the same position as the forefront surface of the first group cylinder 4 when mounted on the zoom lens barrel. On the inner peripheral surface side of the first cam cylinder 12, a cam part 12c for engaging the follower 4a and a cam part 12d for engaging the cam pin follower part 8a are formed.

  In the first cam cylinder 12, a cam follower 12a, a drive pin 12b, a cam portion 12c, and a cam portion 12d are provided at three positions that are different from each other in the circumferential direction.

  The cam portion 12d of the first cam cylinder (first cam member) 12 is configured as shown in FIG.

  FIG. 8 is an inner surface development view showing the cam portion formed on the inner peripheral surface of the first cam cylinder of the zoom lens barrel according to the embodiment of the present invention.

  The cam portion 12d forms a movement locus of a part of the lens barrel drive area (including the first imaging area). The cam portion 12d has a cam portion 12d-1 engaged with the cam follower portion 8a. At the same time, the cam portion 12d includes a cam portion 12d-3 provided with a gap from the cam follower portion 8a, and a cam portion 12d formed by smoothly changing between the cam portions 12d-1 and 12d-3. -2. A cap member 13 is fixed to the first cam cylinder 12.

  As shown in FIGS. 1 to 3, the zoom lens barrel includes a rectilinear barrel 14. The rectilinear cylinder 14 is provided with three rectilinear key portions 14a at different positions in the circumferential direction. Further, the rectilinear cylinder 14 is provided with a rectilinear groove 14 b that engages with the cam pin side surface part 8 b of the second group holding member 8 and a rectilinear groove part 14 c that engages with the convex part 4 b of the first group cylinder 4.

  In this straight cylinder 14, four convex portions 14 d provided at different positions in the circumferential direction and the concave portions 12 e of the first cam cylinder 12 can be incorporated at a predetermined phase. As shown in FIG. 6, the rectilinear cylinder 14 is configured to be rotatable relative to the first cam cylinder 12 and to be movable in the optical axis direction integrally with the first cam cylinder 12 in the drive region.

  This zoom lens barrel includes a second cam barrel 15. The second cam cylinder 15 includes a cam portion 15a for engaging the cam follower 12a, a through cam portion 15b for penetrating the drive pin 12b, and a rectilinear groove 15c for engaging the rectilinear key portion 14a of the rectilinear cylinder 14. Is provided. Further, the second cam cylinder 15 is provided with a rectilinear groove 15 d that engages with the cam pin side surface portion 9 b of the moving base member 9.

  FIG. 9 is an inner surface development view showing the cam portion formed on the inner peripheral surface of the second cam cylinder of the zoom lens barrel according to the embodiment of the present invention.

  The second cam cylinder 15 is provided with three claw portions 15e at different positions in the circumferential direction. The second cam cylinder 15 includes a rectilinear member 16. The rectilinear member 16 is provided with three rectilinear key portions 16a at different positions in the circumferential direction. As shown in FIG. 7, the rectilinear member 16 is provided with three claw portions 16 b at different positions in the circumferential direction, and engages with the hole 15 f of the second cam cylinder 15 to engage the second cam cylinder. 15 and unity.

  This zoom lens barrel includes a third cam barrel (second cam member) 17. The third cam cylinder (second cam member) 17 is provided with three cam followers 17a and drive pins 17b at different positions in the circumferential direction. The third cam cylinder 17 is formed with a cam portion 17c that engages the cam pin follower portion 9a on the inner peripheral surface side.

  FIG. 10 is an inner surface development view showing the cam portion formed on the inner peripheral surface of the third cam barrel of the zoom lens barrel according to the embodiment of the present invention.

  The cam portion 17c forms a movement locus of a part of the lens barrel drive area (including the second imaging area).

  Moreover, the cam part 17c has the cam part 17c-1 engaged with the cam follower part 9a. The cam portion 17c includes a cam portion 17c-3 provided with a gap from the cam follower portion 9a, and a cam portion 17c-2 formed by smoothly changing between the cam portions 17c-1 and 17c-3. Is provided.

  Further, the third cam cylinder 17 is provided with a rectilinear groove 17d for engaging the drive pin 12b of the first cam cylinder 12. The third cam cylinder 17 can be incorporated when the second cam cylinder 15 and the claw portion 15e are deformed. The third cam cylinder 17 is mounted so as to be rotatable relative to the second cam cylinder 15 and is driven integrally with the second cam cylinder 15 in the optical axis direction. A cap member 18 is fixed to the third cam cylinder 17.

  The zoom lens barrel includes a fixed barrel 19. As shown in FIG. 11, the fixed cylinder 19 has a cam portion 19a for engaging the cam follower 17a, a penetrating cam portion 19b for penetrating the drive pin 17b, and a rectilinear key for engaging the rectilinear key portion 16a of the rectilinear member 16. A groove 19c is provided.

  FIG. 11 is an inner surface development view showing the cam portion formed on the inner peripheral surface of the fixed barrel of the zoom lens barrel according to the embodiment of the present invention.

  This zoom lens barrel includes a drive cylinder 20. The drive cylinder 20 is provided with a groove portion 20a that engages with the drive pin 17b and a gear portion 20b.

  This zoom lens barrel includes a base member 21. The base member 21 is a member fixed to a camera body (not shown). A fixed cylinder 19 is fixed to the base member 21. An imaging element 23 is attached to the base member 21.

  A cover member 22 that restricts the optical axis direction of the drive cylinder 20 is fixed to the fixed cylinder 19.

  Next, the operation of the zoom lens barrel configured as described above according to the present embodiment will be described.

  First, the operation of the first group cylinder 4 provided with the first group lens 1 will be described. In this zoom lens barrel, in order to drive the first group cylinder 4, driving of a driving mechanism (not shown) is started. As a result, the driving force of the driving mechanism is transmitted to the gear portion 20b of the driving cylinder 20, and the driving cylinder 20 rotates in the lens barrel extending direction.

  Then, since the drive pin 17b of the third cam cylinder 17 is engaged with the drive cylinder 20, the third cam cylinder 17 also rotates in the same direction. At the same time, the third cam cylinder 17 moves in the optical axis direction because the cam follower 17a is engaged with the cam portion 19a of the fixed cylinder 19.

  At this time, since the rectilinear key portion 16a of the rectilinear member 16 is engaged with the rectilinear groove 19c of the fixed cylinder 19, the second cam cylinder 15 is integrated with the rectilinear member 16 in the optical axis direction without rotating. Moving.

  Further, at this time, since the drive pin 12b of the first cam cylinder 12 is engaged with the second cam cylinder 15, the first cam cylinder 12 also rotates in the same direction.

  The first cam cylinder 12 moves in the optical axis direction because the cam follower 12a of the first cam cylinder 12 is engaged with the cam portion 15a of the second cam cylinder 15. At this time, since the rectilinear key portion 14a is engaged with the rectilinear groove 15c of the second cam cylinder 15, the rectilinear cylinder 14 moves integrally with the second cam cylinder 12 in the optical axis direction without rotating. .

  In the first group cylinder 4, the follower 4a is engaged with the cam portion 12c of the first cam cylinder 12, and is guided by the convex portion 4b of the first group cylinder 4 and the rectilinear groove portion 14c. Moves straight in the direction of the optical axis.

  In this way, the first group cylinder 4 moves from the state shown in FIG. 1 to the state shown in FIG. 2, and further moves to the state shown in FIG. 3 along the cam locus shown in FIG.

  FIG. 4 shows the movement trajectory of the first lens group and first lens barrel, the second lens group and the second lens holding member of the zoom lens barrel according to the embodiment of the present invention. It is explanatory drawing showing the synthesis | combination of.

  Next, the operation of the second group holding member 8 will be described.

In the retracted state of FIG. 1, the second group holding member 8 is moved in a direction (positioning to an initial position) adjacent to the moving base member 9 by the spring member 10 installed between the hook portion 8c and the hook portion 9c. It is urged and abuts against the moving base member 9. Further, the movable base member 9, the inner diameter portion 9d, and the outer diameter portion 8d are substantially fitted and can be moved integrally.
Moreover, since the cam follower part 8a of the 2nd group holding member 8 is located in the cam part 12d-3, the clearance gap is provided and it is not engaging.

  As described above, the second group holding member 8 is engaged with the cam portion 17c-1 of the third cam cylinder 17 by engaging the cam follower portion 9a of the movable base member 9 with the initial position (in FIG. 1). (Stored state).

  In this zoom lens barrel, when the movement starts from the zoom lens barrel retracted state, the third cam barrel 17 rotates when the drive barrel 20 rotates in the barrel extension direction as described above. Thereby, since the cam pin side surface portion 9b is guided by the rectilinear groove 15c of the second cam cylinder 15, the moving base member 9 moves straight in the optical axis direction along the locus of the cam portion 17c-1 (shown in FIG. 10). Moving.

  As described above, the second group holding member 8 has the cam pin follower portion 9a of the movable base member 9 and the cam portion 17c of the third cam cylinder 17 in the housed state of FIG. 1 to the WIDE state of FIG. -1 engages and moves along the movement trajectory.

  Then, the second group holding member 8 is driven along the trajectory of the cam portion 17c-1, and enters the state shown in FIG. 5 at the boundary between the cam portions 17c-1 and 17c-2.

  FIG. 5 is a cross-sectional view showing the state of the zoom lens barrel according to the embodiment of the present invention in the vicinity of the boundary between the first imaging region a and the second imaging region b.

At the boundary between the cam portions 17c-1 and 17c-2, the cam pin follower portion 8a engages with the cam portion 12d-1, and is guided by the rectilinear groove 14b that engages with the cam pin side surface portion 8b. It moves straight in the direction of the optical axis along the trajectory. In this way, the second group holding member 8 is driven along the locus of the cam portion 12d-1 in the first drive region a.
At this time, the second group holding member 8 and the moving base member 9 are in a position where they are separated from each other against the urging force of the spring member 10, and the state shown in FIG.

  Before and after the boundary between the first imaging region a and the second imaging region b, cam portions 12d-2 and 12d-3 (shown in FIG. 8) and cam portion 17c-2 that do not engage with the follower portions 8a and 9a. 17c-3 (shown in FIG. 10).

  In the region of the cam portions 17c-2 and 17c-3, the engagement is released in a state where the cam follower portion 9a is in contact with the cam portions 17c-2 and 17c-3. Further, in the region of the cam portions 12d-2 and 12d-3, the engagement is released while the cam follower portion 8a is in contact with the cam portions 12d-2 and 12d-3.

  In this manner, only one of the cam followers 8a and 9a is engaged with the cam portions 17c-1 and 12d-1.

  As described above, in this zoom lens barrel, the cam follower portion 9a of the moving base member 9 engages with the cam portion 17c-1 of the third cam barrel 17 in the second imaging region b. In the first imaging region a, the cam follower portion 8a engages with the cam portion 12d-1 of the first cam cylinder 12.

  Thereby, the second group holding member 8 is driven along the movement locus shown in FIG. That is, in this zoom lens barrel, the movement area in the optical axis direction in the imaging area of the second group lens is divided into the first cam cylinder 12 and the third cam cylinder 17, so that the second group holding member 8 moves in the optical axis direction. A larger amount can be secured.

  Further, the first cam cylinder 12 is arranged on the outer peripheral side of the first group cylinder 4, and the optical axis direction is such that the forefront surface of the first cam cylinder 12 is substantially the same position as the forefront surface of the first group cylinder 4. The length of is set. Therefore, in the zoom lens barrel configured in this way, the movement locus of the cam portion 12d in the optical axis direction can be lengthened, and a larger amount of movement of the second group lens in the optical axis direction can be secured.

  Further, in this zoom lens barrel, the cam portion 12c of the first group cylinder 4 and the cam portion 12d of the second group holding member 8 are formed on the inner peripheral surface side of the first cam cylinder 12, and the radial thickness of the cam cylinder is formed. To reduce the outer diameter of the lens barrel, thereby reducing the size of the lens barrel.

  That is, in the configuration of this zoom lens barrel, the cam portion of the second group holding member 8 is formed on the inner peripheral side of the first cam barrel 12, and the cam portion of the first group barrel is formed on the outer peripheral surface side of the first cam barrel 12. The lens barrel can be downsized as compared with the configuration to be performed.

  Further, in this zoom lens barrel, the cam portions 12d-2, 12d-3 and the cam portion 17c-2 which do not engage with the follower portions 8a, 9a before and after the boundary between the first imaging region a and the second imaging region b. 17c-3. Thereby, in this zoom lens barrel, the follower portion 8a and the cam portion 12d-1 can be smoothly engaged with the follower portion 9a and the cam portion 17c-1.

  In short, in the zoom lens barrel shown in FIGS. 1 to 3 and 5 according to the embodiment of the present invention, the mechanism for moving the first group lens 1 is mainly the first group cylinder 4 and the first cam. The cylinder 12, the third cam cylinder 17 and the fixed cylinder 19 are configured.

  For this reason, in this zoom lens barrel, the fixed cylinder 19 is fixedly disposed on the base member 21 fixed to the camera body.

  A third cam cylinder (second cam member) 17 is attached to the fixed cylinder 19 by a cam feed mechanism so as to be capable of being extended and retracted in the optical axis direction.

  A first cam cylinder (first cam member) 12 is mounted on the third cam cylinder (second cam member) 17 so that the first cam cylinder (first cam member) 12 can be extended and retracted in the optical axis direction by a cam feed mechanism.

  A first group cylinder 4 provided with a first group lens 1 is attached to the first cam cylinder (first cam member) 12 by a cam feed mechanism so as to be extended and retracted in the optical axis direction.

  Therefore, the first group lens 1 is moved in the optical axis direction by the drawing / retracting operation of the first group cylinder 4, the first cam cylinder (first cam member) 12, and the third cam cylinder (second cam member) 17.

  Next, a mechanism for continuously moving the second group lens 2 in the zoom lens barrel over the first imaging area a and the second imaging area b connected in series will be described.

  In this zoom lens barrel, in order to move the second group lens 2, a first grouping member (first moving member) 8 and a first cam cylinder (first cam member) 12 are provided with a first A cam feed mechanism for the imaging area a (first area) is configured.

  At the same time, between the moving base member (second moving member) 9 and the third cam cylinder (second cam member) 17 that detachably holds the second group holding member (first moving member) 8, A cam feed mechanism for the second imaging region (second region) is configured.

  The mechanism for moving the second group lens 2 performs an operation of shifting from the first imaging region a (the first region cam feed mechanism side) to the second imaging region b. At this time, in the mechanism for moving the second group lens 2, the cam follower (follower portion 8a) is detached from the cam groove (cam portion 12d-1) in the cam feeding mechanism for the first imaging region a. At the same time, in the mechanism for moving the second group lens 2, the cam follower (follower portion 9a) engages with the cam groove (cam portion 17c-1) in the cam feeding mechanism for the second imaging region b.

  Further, in the mechanism for moving the second group lens 2, the cam groove (cam portion 17c) in the cam feeding mechanism for the second imaging region b when moving from the second imaging region b to the first imaging region a. -1), the cam follower (follower portion 9a) is detached. At the same time, in the mechanism for moving the second group lens 2, the cam follower (follower portion 8a) is engaged with the cam groove (cam portion 12d-1) in the cam feeding mechanism for the first imaging region a.

  As a result, the second group lens 2 can move smoothly between the cam feeding mechanism for the first imaging area a and the cam feeding mechanism for the second imaging area b.

  Further, the second group lens 2 has a second shooting corresponding to the length of the third cam cylinder 17 at the feeding distance of the cam feeding mechanism for the first imaging area a corresponding to the length of the first cam cylinder 12. It becomes possible to move a long distance by adding the feeding distance of the cam feeding mechanism for the region b. That is, the second lens group 2 has a long distance corresponding to the length of two cam cylinders, the first cam cylinder (first cam member) 12 and the third cam cylinder (second cam member) 17. (About twice as much as conventional) can be moved.

It is sectional drawing which shows the accommodation state of the zoom lens barrel concerning embodiment of this invention. It is sectional drawing which shows the WIDE state of the zoom lens-barrel concerning embodiment of this invention. It is sectional drawing which shows the TELE state of the zoom lens-barrel concerning embodiment of this invention. FIG. 5 shows the movement trajectories of the first lens group and the first lens barrel, the second lens group and the second lens holding member of the zoom lens barrel according to the embodiment of the present invention, and shows the synthesis of the trajectory of each cam. FIG. It is sectional drawing which shows the state of the vicinity of the boundary of the 1st imaging | photography area | region and the 2nd imaging | photography area | region of the zoom lens barrel concerning embodiment of this invention. It is explanatory drawing which takes out and shows the state which assembled | attached the cam cylinder and the rectilinear advance cylinder of the zoom lens barrel concerning embodiment of this invention. It is explanatory drawing which takes out and shows the state to which the 2nd cam cylinder and the rectilinear advance member are united of the zoom lens barrel concerning embodiment of this invention. FIG. 3 is an inner surface development view showing a cam portion formed on an inner peripheral surface of a first cam cylinder of a zoom lens barrel according to an embodiment of the present invention. It is an inner surface development view which expands and shows the cam part formed in the inner peripheral surface of the 2nd cam cylinder of the zoom lens barrel concerning an embodiment of the invention. It is an inner surface development view which expands and shows the cam part formed in the inner peripheral surface of the 3rd cam cylinder of the zoom lens barrel concerning an embodiment of the invention. It is an inner surface development view which expands and shows the cam part formed in the inner peripheral surface of the fixed cylinder of the zoom lens barrel concerning an embodiment of the invention. FIG. 2 is a front view of a zoom lens barrel according to an embodiment of the present invention in a state where a spring member 10 is installed on a second group holding member 8 and a moving base member 9.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st group lens 2 2nd group lens 3 Focus lens 4 1st group cylinder 5 Front cover member 6 1st group cap member 7 Lens holding member 8 2nd group holding member 9 Moving base member 10 Spring member 11 Lens holding member 12 1st cam cylinder 13 Cap member 14 Straight cylinder 15 Second cam cylinder 16 Linear member 17 Third cam cylinder 18 Cap member 19 Fixed cylinder 20 Drive cylinder 21 Base member 22 Cover member 23 Imaging element

Claims (4)

A first moving member holding the lens;
A first cam groove that engages with the first cam follower portion of the first moving member ; and the first moving member is moved along a locus of the first cam groove in a first drive region. A first cam member movable in the optical axis direction;
A second moving member that holds the first moving member; a second cam groove that engages with a second cam follower portion of the second moving member; A second cam member capable of moving the second moving member in the optical axis direction along the locus of the two cam grooves,
In the first drive region, the first moving member can be moved independently,
In the second drive region, the first moving member and the second moving member can be moved together,
When shifting from the first drive region to the second drive region, the first cam follower part that has been engaged with the first cam groove is detached from the first cam groove, and The second cam follower part that has been detached from the second cam groove engages with the second cam groove;
When shifting from the second drive region to the first drive region, the second cam follower part engaged with the second cam groove is detached from the second cam groove, and A lens barrel characterized in that the first cam follower part that has been detached from the first cam groove engages with the first cam groove . A first group cylinder that holds a lens that is housed in the barrel main body in the housed state and that is positioned closer to the object side than the lens held by the first moving member ;
The lens barrel according to claim 1, wherein the first cam member has a third cam groove that engages with a cam follower portion of the first group cylinder.   A spring member is installed between the first moving member and the second moving member so as to bias the first moving member in a direction in which the first moving member is positioned at an initial position of the second moving member. The lens barrel according to claim 1 or 2, characterized in that   The first moving member and the second moving member are attached in a direction approaching each other by a spring member provided between the hook portion of the first moving member and the hook portion of the second moving member. The lens barrel according to any one of claims 1 to 3, wherein the lens barrel is biased.

Images