JP5213600B2 - Lens barrel and optical apparatus equipped with the same - Google Patents

Description

  The present invention relates to a lens barrel mounted on an optical device such as a camera and an optical device including the lens barrel.

  2. Description of the Related Art Conventionally, a lens barrel used in an optical device such as a camera has been proposed in which a lens is moved in an optical axis direction by a cam barrel provided with a cam groove and a lens holder provided with a lens and a cam pin ( For example, see Patent Document 1).

  In this conventional lens barrel, when the cam cylinder is rotated and the cam pin engaged with the cam groove on the inner peripheral side of the cam cylinder moves along the cam groove, the lens holder is guided by the linear key in conjunction with the cam pin. Moves in the direction of the optical axis.

  In such a conventional lens barrel, when an external force such as dropping is applied to the lens barrel, the cam groove and the cam pin may be disengaged and dislocation may occur. For this reason, in this conventional lens barrel, the projection provided so as to receive an external force in the pushing direction when in the photographing state receives an external force such as a drop to prevent dislocation.

  In addition, a lens barrel configured to perform a zooming operation using a ball screw mechanism has been proposed (for example, see Patent Document 2).

In a lens barrel using this ball screw mechanism, an n-phase armature coil is arranged around the barrel to constitute a stator. Inside the barrel as the stator, a plurality of pairs of permanent magnets are arranged on the outer peripheral surface, and a rotor holding a variator lens is arranged. A ball screw mechanism for inserting and circulating a ball is provided between a screw groove provided on the inner periphery of the lens barrel as the stator and a screw groove provided on the outer periphery of the rotor. In the lens barrel configured as described above, the rotating motion of the rotor is reduced by the ball screw mechanism to reduce the friction loss and efficiently converted into the motion in the optical axis direction to perform the zooming operation.
JP 2001-324663 A JP 05-333255 A

  However, a lens barrel provided with a projection that receives an external force in the pushing direction when in the photographing state has no means for receiving an external force in the pulling direction applied to the lens barrel when the lens barrel is stored. For this reason, in this conventional lens barrel configuration, the cam follower may be dislocated from the cam groove when the lens barrel receives an external force in the pulling direction when the lens barrel is stored.

  In particular, in a lens barrel that uses a ball screw mechanism configured to be converted into motion in the optical axis direction by inserting a ball follower into the screw groove, an external force in the pulling direction is applied to the lens barrel when the lens barrel is stored. And it was easily dislocated.

  An object of the present invention is to provide a lens barrel capable of preventing the ball follower from being dislocated from the cam groove even when an external force in the pulling direction is applied when the lens barrel is stored, and an optical apparatus including the lens barrel. It is in.

In order to achieve the above object, a lens barrel according to claim 1 is configured such that a cam groove and a ball follower are provided between a first cylinder and a second cylinder provided inside the first cylinder. In the lens barrel that moves the first cylinder and the second cylinder relative to each other in the optical axis direction by the cam mechanism, the first cylinder provided in the one cylinder in the stored state The phase of the stopper overlaps with the second stopper provided on the other cylindrical body in the circumferential direction of the lens barrel, and when receiving an external force, the first stopper acts as the second stopper. By abutting, the cam groove and the ball follower are prevented from dislocation in the optical axis direction, and the one cylindrical body and the one cylindrical body and the The other cylinder is relative to the circumferential direction of the lens barrel. In that the phase shifts, and said first stopper can not overlap the phase in the circumferential direction of the lens barrel relative to the second stopper.

  According to the present invention, it is possible to prevent the ball follower from being dislocated from the cam groove when an external force in the pulling direction is applied to the lens barrel while the lens barrel is being stored.

  Hereinafter, a lens barrel according to an embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is an enlarged cross-sectional perspective view showing main parts of a cam barrel 8, a CCD holder 14, a cam barrel dislocation prevention stopper 8L, and a CCD holder stopper 14b in a retracted state in a lens barrel according to an embodiment of the present invention. FIG.

  FIG. 2 is an external perspective view of a camera as an optical apparatus equipped with the lens barrel according to the embodiment of the present invention.

  FIG. 3 is a front view of a camera equipped with a lens barrel according to an embodiment of the present invention.

  FIG. 4 is a perspective view of a lens barrel extracted from the lens barrel portion according to the embodiment of the present invention.

  FIG. 5 is a longitudinal sectional view taken along line AA of FIG. 3 showing the internal structure of the retracted lens barrel.

  6 is a cross-sectional view taken along line BB in FIG. 3 showing the internal structure of the retracted lens barrel.

  7 is a cross-sectional view taken along line CC of FIG. 3 showing the internal structure of the retracted lens barrel.

  FIG. 8 is a longitudinal sectional view taken along line AA of FIG. 3 showing the internal structure of the lens barrel in the wide photographing state.

  FIG. 9 is a longitudinal sectional view taken along line BB in FIG. 3 showing the internal structure of the lens barrel in the wide photographing state.

  FIG. 10 is a longitudinal sectional view taken along line CC of FIG. 3 showing the internal structure of the lens barrel in the wide photographing state.

  FIG. 11 is a longitudinal sectional view taken along line AA of FIG. 3 showing the internal structure of the lens barrel in the telephoto state.

  12 is a longitudinal sectional view taken along line BB in FIG. 3 showing the internal structure of the lens barrel in the telephoto state.

  FIG. 13 is a longitudinal sectional view taken along line CC of FIG. 3 showing the internal structure of the lens barrel in the telephoto state.

  14 is a longitudinal sectional view taken along the line DD of FIG. 3 showing the internal structure of the retracted lens barrel.

  FIG. 15 is a longitudinal sectional view taken along line DD of FIG. 3 showing the internal structure of the lens barrel in the wide shooting state.

  FIG. 16 is a perspective view showing the CCD holder 14 provided with the CCD holder impact receiving portion 14a in the lens barrel according to the embodiment of the present invention.

  FIG. 17 is a perspective view showing the ball confirmation window 8k provided in the cam barrel 8 in the lens barrel according to the embodiment of the present invention.

  FIG. 18 is a perspective view showing a fixed cylinder ball follower 9b and a fixed cylinder ball spring 9d provided in the fixed cylinder 9 in the lens barrel according to the embodiment of the present invention.

  FIG. 19 is an enlarged perspective view of the main part of the lens barrel according to the embodiment of the present invention, showing the main parts of the cam barrel dislocation prevention stopper 8L and the CCD holder stopper 14b in the wide shooting state.

  As shown in FIG. 5, the lens barrel 2 includes a first group lens L1, a second group lens L2, a third group lens L3, and a fourth group lens L4. The focus adjustment is performed by moving the fourth group lens L4 in the optical axis direction. Is configured to do.

  As understood from FIGS. 5, 8, 11, and 17, the first group lens L <b> 1 is held by the first group lens holder 3. The first group lens holder 3 is provided with a cam mechanism configured by engaging a ball with a cam groove for converting a rotation operation into a rectilinear operation at three locations spaced apart from each other in the circumferential direction.

  In order to constitute this cam mechanism, the first group lens holder 3 is provided with a first group ball follower 3a, a first group ball spring 3b, a first group impact pin 3c, and a first group rectilinear groove 3d. The first group ball spring 3b biases the first group ball follower 3a so as to contact the first group cam groove 8b.

  The second group lens L2 is held by a second group lens holder 4 having a second group cam pin 4a and a pair of second group bars 4b extending in the optical axis direction. The third group lens L3 is held by a third group lens holder 5 having a third group cam pin 5a, a third group sleeve 5b, and a third group steady rest 5c. The fourth group lens L4 is held by the fourth group lens holder 6.

  As shown in FIG. 7, the lens barrel 2 includes a shutter unit 7. The shutter unit 7 includes an SH cam pin 7a, an SH sleeve 7b, and an SH steady stop 7c. Further, in the lens barrel 2, the third group sleeve 5b and the SH sleeve 7b are fitted to one second group bar 4b disposed therein so as to be movable in the optical axis direction. Further, in the lens barrel 2, the third group steady rest 5c and the SH steady rest 7c are fitted to the other second group bar 4b disposed therein so as to be movable in the optical axis direction.

  As shown in FIGS. 5 and 7, the lens barrel 2 moves straight between the inner periphery of the first lens group holder 3 and the outer periphery of the second lens group holder 4 with the cam cylinder 8 (outer cylinder). A fixed cylinder 9 (inner cylinder) that functions as a guide cylinder is arranged and configured.

  The cam cylinder 8 is mounted so as to be rotatable with respect to the center of the optical axis inside the lens barrel 2. The cam cylinder 8 is provided with a gear portion 8a, a first group cam groove 8b, and a first group impact receiving groove 8h on the outer peripheral portion. In addition, a second group cam groove 8c, a third group cam groove 8d, an SH cam groove 8e, a cam cylinder drive cam groove 8g (shown in FIG. 14), and a roller guide 8i are provided on the inner peripheral portion of the cam cylinder 8. Yes.

  As shown in FIG. 12, a cam barrel impact receiving portion 8j is provided on the end surface of the cam barrel 8 on the CCD holder 14 side.

  As shown in FIG. 17, a fixed cylinder ball follower window 8k is formed at a predetermined position on the bottom surface of the cam cylinder drive cam groove 8g.

  As shown in FIG. 6, a cam cylinder dislocation prevention stopper 8 </ b> L is formed on the outer periphery of the cam cylinder 8.

  As shown in FIG. 5, the first group ball follower 3a is in contact with the first group cam groove 8b by the urging force of the first group ball spring 3b.

  In the first group impact receiving groove 8h, the first group impact pin 3c is disposed while maintaining an appropriate gap in a normal driving state.

  On the outer peripheral wall of the fixed cylinder 9, which is a linear guide cylinder, through-hole-like two-group linear grooves 9 a (shown in FIG. 7) extending in the optical axis direction are arranged at three locations spaced from each other in the circumferential direction. . Further, as shown in FIGS. 7 and 18, a first group rectilinear key 9c is formed on the upper end surface of the fixed cylinder 9 in the same phase as the second group rectilinear groove 9a. A second group cam pin 4a is fitted in the second group rectilinear groove 9a so as to be movable in the optical axis direction. The first group rectilinear key 9c is fitted so that the first group rectilinear groove 3d is movable in the optical axis direction.

  As can be understood from FIGS. 14 to 18, the fixed cylinder ball follower 9 b is attached to the outer peripheral portion of the fixed cylinder 9 at three locations that are spaced apart from each other in the circumferential direction. At least one of the fixed cylinder ball followers 9b is urged so as to be pressed against the cam cylinder drive cam groove 8g of the cam cylinder 8 by the fixed cylinder ball spring portion 9d. The remaining two fixed cylinder ball followers 9b are elastically pressed against the cam cylinder drive cam groove 8g by the reaction force of the fixed cylinder ball spring portion 9d that urges one fixed cylinder ball follower 9b.

  As shown in FIG. 7, on the outer periphery of the fixed cylinder 9 (inner cylinder), a cam cylinder 8 (outer cylinder) is rotatably supported via a roller 9i. The roller 9i is a roller made of an elastic material such as polyacetal. The roller 9i is configured by arranging a pair of shaft portions 9ia at both ends of a thick shaft drum portion 9ib. The roller 9 i is rotatably supported at both ends of the shaft portion 9 ia by the bearing of the fixed cylinder 9, the drum portion 9 ib is in rolling contact with the roller guide 8 i of the roller cam cylinder 8, and the cam cylinder 8 is on the outer periphery of the fixed cylinder 9. Are supported so as to be relatively rotatable.

  As shown in FIGS. 4 and 5, the lens barrel 2 is a four-group driving device using a driving gear 10, a zoom driving device 11, a main substrate 12, a lens barrel flexible 13, a CCD holder 14, and a voice coil 15. Prepare.

  The CCD holder 14 is provided with a CCD holder impact receiving portion 14a (shown in FIGS. 12 and 16) for preventing dislocation. The CCD holder 14 for preventing dislocation is provided with a CCD holder stopper 14b (shown in FIG. 6) as a member on the cylinder side of the fixed cylinder 9 so as to be integrated with the fixed cylinder 9. The CCD holder 14 is fixed to the main body side of the digital camera 1 and is configured to hold the fixed cylinder 9, the driving gear 10, the zoom driving device 11, and the fourth group driving device 15.

  Further, in the camera 1 which is the digital camera (electronic camera), the main board 12 is built in the camera body. The main substrate 12 is connected to a CCD 26 on the CCD plate 25 via a wiring (not shown). The digital camera 1 is configured to shoot a subject image formed on the CCD 26 by the lens barrel 2.

  Next, the operation of the retractable barrel 2 configured as described above will be described.

  In the camera 1, when the lens barrel 2 is moved in the optical axis direction, the zoom driving device 11 is energized from the main substrate 12 through the lens barrel flex 13 by a control unit (not shown) to control driving. Then, the rotational driving force of the zoom driving device 11 is transmitted to the cam cylinder 8 via the drive gear 10 meshing with the gear portion 8 a, and the cam cylinder 8 rotates relatively around the fixed cylinder 9.

  Then, in this barrel 2, as the cam barrel 8 rotates, the first group ball follower 3 a that engages with the first group cam groove 8 b on the inner peripheral side of the cam barrel 8 is provided with the first group cam groove 8 b (spiral cam Move along the groove). At this time, the first group lens holder 3 provided with the first group ball follower 3a is guided by the first group rectilinear key 9c fitted in the first group rectilinear groove 3d. Moves in the direction of the optical axis.

  Similarly, in the lens barrel 2, when the cam cylinder 8 rotates, the second group cam pin 4a engaged with the second group cam groove 8c on the inner peripheral side of the cam cylinder 8 extends along the cam groove of the second group cam groove 8c. Moving. Then, in conjunction with this, the second group lens holder 4 and the accompanying lens group holder 4 are guided by the second group rectilinear groove 9a and moved in the optical axis direction.

  Similarly, when the cam cylinder 8 rotates, the third group cam pin 5a engaged with the third group cam groove 8d on the inner peripheral side of the cam cylinder 8 moves along the cam groove of the third group cam groove 8d. Then, in conjunction with this, the third group lens holder 5 and the one attached thereto are guided by the second group bar 4b and moved in the optical axis direction.

  When the cam cylinder 8 rotates, the SH cam pin 7a engaged with the SH cam groove 8e on the inner peripheral side of the cam cylinder 8 moves along the cam groove of the SH cam groove 8e. Then, in conjunction with this, the shutter unit 7 is guided by the second group bar 4b and moves in the optical axis direction.

  Further, the cam cylinder 8 in which the cam cylinder drive cam groove 8g engages with the fixed cylinder ball follower 9b on the outer periphery of the fixed cylinder 9 rotates while the roller guide 8i is guided by the drum portion 9ib. Then, the cam cylinder 8, the first group lens holder 3, the second group lens holder 4, the third group lens holder 5, the fourth group lens holder 6, and the shutter unit 7 are arranged along the cam groove of the cam cylinder drive cam groove 8g as shown in FIG. As shown in FIG. 15, it moves in the optical axis direction.

  Further, in the lens barrel 2, a focusing operation is performed by moving the fourth group lens L4 forward and backward in the optical axis direction by the fourth group driving device 15.

  The lens barrel 2 moves from the retracted state shown in FIGS. 5 to 7 and 14 to the wide imaging state shown in FIGS. 8 to 10 and FIG. At this time, in the lens barrel 2, the first group lens holder 3, the second group lens holder 4, the third group lens holder 5, the fourth group lens holder 6, the shutter unit 7, and the cam barrel 8 are moved in the optical axis direction.

  Further, in the lens barrel 2, the cam barrel 8 is rotated to move to a tele photographing state shown in FIGS.

  Next, means for preventing dislocation of the cam barrel in the lens barrel 2 configured as described above will be described with reference to FIGS. 1, 16, 17, 18, and 19. FIG.

  Means for preventing the dislocation of the cam barrel includes a CCD holder stopper 14b, a cam barrel dislocation prevention stopper 8L, a cam barrel impact receiving portion 8j, a first group linear movement key 9c, and a CCD holder impact receiving portion 14a.

  As shown in FIG. 1, when the lens barrel 2 is retracted (stored), the cam barrel dislocation prevention stopper 8L is moved toward the subject in the optical axis direction by the CCD holder stopper 14b overlapping the subject side in the optical axis direction. Be regulated. Thereby, in the lens barrel 2, it is possible to prevent the fixed cylinder ball follower 9b from being dislocated from the cam cylinder drive cam groove 8g due to the urging force of the fixed cylinder ball spring portion 9d being lost when receiving an external force in the pulling direction. It becomes possible.

  In the lens barrel 2, a CCD holder 14 is disposed adjacent to the image forming surface side of the cam barrel 8 in the optical axis direction. The CCD holder 14 is integrally disposed on the fixed cylinder 9 side, and is attached in a state where the positions of the CCD holder 14 and the fixed cylinder 9 are immovable.

  In this barrel 2, the CCD holder 14 restricts the movement of the cam barrel 8 toward the image plane in the optical axis direction when an external force in the pushing direction is applied to the barrel 2 during retraction. As a result, the fixed cylinder ball follower 9b and the cam cylinder drive cam groove 8g shown in FIG. 14 are prevented from being disengaged.

  That is, in the means for preventing the dislocation of the cam tube provided in the lens barrel 2, the cam tube dislocation prevention stopper 8L is formed at the base end portion (the end portion adjacent to the CCD holder 14) of the cam tube 8. .

  The cam cylinder 8 is formed with a large-diameter edge 80 whose outer diameter is increased by one step at the base end. Further, on the outer peripheral surface of the large-diameter edge portion 80 of the cam cylinder 8, a gear portion 8a, which is an external gear, is formed over a predetermined arc-shaped range.

  The cam cylinder 8 is formed with a cam cylinder dislocation prevention stopper 8L, which is a convex portion for locking, arranged so as to be continuous with the end of the gear portion 8a. The cam barrel dislocation prevention stopper 8L protrudes from the outer peripheral surface of the large-diameter edge 80 by the height of the teeth of the gear portion 8a, and has a small rectangular trapezoidal shape having a width about twice the tooth width of the gear portion 8a. Form.

  Further, in the means for preventing the dislocation of the cam tube provided in the lens barrel 2, the cam tube dislocation prevention stopper 8L, which is a convexly formed portion for locking, is detachably locked to the CCD holder 14. A CCD holder stopper 14b is formed.

  The CCD holder stopper 14b is disposed at a position adjacent to the gear portion 8a in the CCD holder 14 and corresponding to a position where the cam cylinder dislocation prevention stopper 8L of the cam cylinder 8 in the retracted state (stored state) is placed. . The CCD holder stopper 14b is formed in an arc shape, and has an inverted L-shaped cross section so that the free end thereof faces the stop end face of the cam cylinder dislocation prevention stopper 8L (the end face opposite to the CCD holder 14 and facing the subject). It is equipped with a restraining head that bends and extends like a bowl.

  Next, the operation of the means for preventing the dislocation of the cam cylinder provided in the lens barrel 2 will be described. In the lens barrel 2, when the rotational phase of the cam barrel 8 transitions between the retracted state and the wide photographing state, a means for attaching and detaching means for preventing the dislocation of the cam barrel 8 is performed.

  When the cam cylinder 8 is rotated from the retracted state to the transition state, the cam cylinder dislocation prevention stopper 8L does not overlap the object side in the optical axis direction by the CCD holder stopper 14b, so the cam cylinder 8 moves toward the object side in the optical axis direction. It becomes possible. In this transition state, the cam cylinder 8 is moved in the optical axis direction to shift to the position of the wide photographing state shown in FIGS.

  That is, in this lens barrel 2, the cam barrel dislocation prevention stopper 8L is provided with the CCD holder stopper in accordance with the operation in which the cam barrel 8 rotates by a predetermined angle on the CCD holder 14 when the cam barrel 8 is shifted from the photographing state to the retracted state. 14b. In this retracted state (stored state), the CCD holder stopper 14b is detachably locked with the cam barrel dislocation prevention stopper 8L sandwiched between the upper surface of the CCD holder 14 and the restraining head of the CCD holder stopper 14b. Thus, the cam cylinder 8 integrated with the cam cylinder dislocation prevention stopper 8L is supported by the CCD holder 14 so as not to move in the optical axis direction. In this barrel 2, when an external force in the pushing direction is applied to the first group lens holder 3 in the retracted state, the first group impact pin 3 c comes into contact with the first group impact receiving groove 8 h and the external force in the pushing direction of the first group lens holder 3 is reached. Is transmitted to the cam barrel 8, and the cam barrel 8 is moved to the optical axis direction imaging plane side.

  However, before the movement amount of the cam cylinder 8 reaches the state where the fixed cylinder ball follower 9b dislocates from the cam cylinder drive cam groove 8g, the cam cylinder dislocation prevention stopper 8L comes into contact with the restraining head of the CCD holder stopper 14b and is fixed. The cylindrical ball follower 9b can be prevented from dislocation from the cam cylinder driving cam groove 8g.

  Further, when the cam cylinder 8 is shifted from the retracted state to a transition state between the retracted state and the wide photographing state in the rotational phase of the cam cylinder 8, the cam cylinder 8 rotates on the CCD holder 14 by a predetermined angle. To do. Then, as the cam cylinder 8 rotates, the cam cylinder dislocation prevention stopper 8L rotates and separates from the CCD holder stopper 14b. As a result, the cam barrel 8 integrated with the cam barrel dislocation prevention stopper 8 </ b> L can move in the optical axis direction with respect to the CCD holder 14.

  Next, when the rotational phase of the cam barrel 8 of the lens barrel 2 is in the wide photographing state or the tele photographing state, an external force is applied and the fixed cylindrical ball follower 9b dislodges from the cam barrel driving cam groove 8g. Means for preventing this will be described.

  As can be understood from FIGS. 10 and 17, in the lens barrel 2, the first-group rectilinear key 9 c is located adjacent to the end of the cam cylinder 8 on the subject side when in the wide shooting state. It is configured as follows. That is, the first-group linear key 9c protrudes in the radial direction from the outer periphery of the fixed cylinder 9 and comes into contact with the subject side end of the cam cylinder 8 mounted on the outer periphery of the fixed cylinder 9 so as to be relatively movable. Configure to be able to stop movement.

  When the lens barrel 2 receives an external force in the pulling direction from the first group lens holder 3 in the photographing state, the first group impact pin 3c comes into contact with the first group impact receiving groove 8h, and the external force in the pulling direction of the first group lens holder 3 is applied. It is transmitted to the cam cylinder 8 and moves the cam cylinder 8 toward the subject side in the optical axis direction.

  However, before the movement amount of the cam cylinder 8 reaches the state where the fixed cylinder ball follower 9b is dislocated from the cam cylinder drive cam groove 8g, the first group rectilinear key 9c as a dislocation prevention member hits the end of the cam cylinder 8. Restricts movement to the subject side in the optical axis direction. Thereby, in the lens barrel 2, it is possible to prevent the fixed cylinder ball follower 9b illustrated in FIG. 14 from being dislocated from the cam cylinder drive cam groove 8g.

  Also, as shown in FIGS. 12 and 16, in this lens barrel 2, when in the tele photographing state, the CCD holder impact receiving portion 14a is positioned adjacent to the imaging surface side of the cam barrel impact receiving portion 8j. Is configured to do. When the lens barrel 2 receives an external force in the pushing direction to the first group lens holder 3 in the photographing state, the first group impact pin 3c comes into contact with the first group impact receiving groove 8h, and the external force in the pushing direction of the first group lens holder 3 is increased. It is transmitted to the cam cylinder 8 to move the cam cylinder 8 toward the optical axis direction image plane.

  However, before the movement amount of the cam cylinder 8 reaches a state where the fixed cylinder ball follower 9b disengages from the cam cylinder drive cam groove 8g, the CCD holder impact receiving portion 14a hits the cam cylinder impact receiving portion 8j and the optical axis of the cam cylinder 8 is reached. Restricts movement toward the directional image plane. Thereby, in the lens barrel 2, it is possible to prevent the fixed cylinder ball follower 9b illustrated in FIG. 14 from being dislocated from the cam cylinder drive cam groove 8g.

FIG. 3 is an enlarged cross-sectional perspective view showing a main part of a cam barrel in a retracted state, a CCD holder, a cam barrel dislocation prevention stopper, and a CCD holder stopper in a lens barrel according to an embodiment of the present invention. 1 is an external perspective view of a camera as an optical apparatus equipped with a lens barrel according to an embodiment of the present invention. 1 is a front view of a camera equipped with a lens barrel according to an embodiment of the present invention. 1 is a perspective view of a lens barrel that shows a lens barrel portion according to an embodiment of the present invention. FIG. It is a longitudinal cross-sectional view by the AA line of FIG. 3 which shows the internal structure of the lens-barrel of a retracted state. FIG. 4 is a cross-sectional view taken along line BB in FIG. 3 showing the internal structure of the retracted lens barrel. It is sectional drawing by CC line of FIG. 3 which shows the internal structure of the lens-barrel of a retracted state. It is a longitudinal cross-sectional view by the AA line of FIG. 3 which shows the internal structure of the lens-barrel of a wide imaging | photography state. FIG. 4 is a longitudinal sectional view taken along line BB of FIG. 3 showing the internal structure of the lens barrel in the wide shooting state. FIG. 4 is a longitudinal sectional view taken along line CC of FIG. 3 showing the internal structure of the lens barrel in a wide shooting state. It is a longitudinal cross-sectional view by the AA line of FIG. 3 which shows the internal structure of the lens-barrel of a tele imaging | photography state. FIG. 4 is a longitudinal sectional view taken along line BB in FIG. 3 showing the internal structure of the lens barrel in a telephoto state. It is a longitudinal cross-sectional view by CC line of FIG. 3 which shows the internal structure of the lens-barrel of a tele imaging | photography state. It is a longitudinal cross-sectional view by the DD line of FIG. 3 which shows the internal structure of the lens-barrel of a retracted state. FIG. 4 is a longitudinal sectional view taken along line DD of FIG. 3 showing the internal structure of the lens barrel in a wide shooting state. It is a perspective view which takes out and shows the CCD holder in which the CCD holder impact receiving part was provided in the lens-barrel concerning embodiment of this invention. It is a perspective view which takes out and shows the ball | bowl confirmation window 8k provided in the cam cylinder 8 in the lens barrel concerning Embodiment of this invention. It is a perspective view which takes out and shows the fixed cylinder ball follower 9b and the fixed cylinder ball spring 9d part which were provided in the fixed cylinder 9 in the lens barrel concerning Embodiment of this invention. FIG. 3 is an enlarged perspective view of a main part of a lens barrel according to an embodiment of the present invention, showing main parts of a cam cylinder dislocation prevention stopper and a CCD holder stopper in a wide shooting state.

Explanation of symbols

L1 1st group lens L2 2nd group lens L3 3rd group lens L4 4th group lens 1 Camera 2 Lens barrel 8 Cam barrel 8g Cam barrel drive cam groove 8j Cam barrel impact receiving portion 8L Cam barrel dislocation prevention stopper 9 Fixed barrel 9b Fixed barrel ball follower 14a CCD holder impact receiving portion 14b CCD holder stopper

Claims (3)

The first cylinder and the second cylinder by a cam mechanism including a cam groove and a ball follower between the first cylinder and the second cylinder provided inside the first cylinder. In a lens barrel that moves the body relatively in the optical axis direction ,
In the retracted state, the first stopper provided in the one cylinder overlaps the second stopper provided in the other cylinder in the circumferential direction of the lens barrel, and external force is applied. When received, the first stopper is in contact with the second stopper to prevent the cam groove and the ball follower from dislocation in the optical axis direction.
The first cylindrical body and the other cylindrical body are relatively out of phase with each other in the circumferential direction of the lens barrel due to the movement of the one cylindrical body from the housed state to the shooting state. A lens barrel, wherein a phase of the stopper does not overlap with the second stopper in the circumferential direction of the lens barrel. In the photographing state, the first impact receiving portion provided on the one cylindrical body has a phase overlapping with the second impact receiving portion provided on the other cylindrical body in the circumferential direction of the lens barrel. the lens barrel according to claim 1, characterized in that there.   An optical apparatus comprising the lens barrel according to claim 1.

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