JP5173689B2 - Lens barrel - Google Patents

Description

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

  2. Description of the Related Art Conventionally, a lens barrel used for a digital camera or the like has been proposed which has a mechanism for moving a lens in the 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, refer to Patent Document 1).

  In this conventional lens barrel, when the cam pin is rotated and the cam pin that engages with the cam groove on the inner peripheral side of the cam barrel moves along the cam groove, the lens holder guided by the rectilinear key is interlocked with the cam pin. Move in the direction of the optical axis.

  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 2008-58581 A JP 05-333255 A

  However, a lens barrel configured by disposing a cam mechanism for converting a rotation operation into a straight movement operation between a cam barrel and a lens holder provided with a lens, and engaging the ball with the cam groove. Then, the manufacturing work is difficult.

  This is because the ball is easily detached from the cam groove in the process of incorporating the ball into the cam groove of the cam mechanism.

  Further, in the cam mechanism having a structure in which the ball is engaged with the cam groove, the ball in the cam groove becomes invisible when another lens barrel is assembled after the operation process of incorporating the ball into the cam groove.

  For this reason, if another lens barrel is assembled in a state where the ball has fallen out of the cam groove, a defective product will be manufactured. It has become.

  An object of the present invention is to make it possible to confirm that a ball is properly assembled after the operation of incorporating the ball into the cam groove of the cam mechanism so that the lens barrel can be manufactured easily and appropriately. The purpose is to do.

In order to achieve the above object, a lens barrel according to claim 1 is provided with a cam groove and a ball follower between a first cylinder and a second cylinder provided outside 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 gap between the first cylinder and the second cylinder A through hole for looking into the ball follower disposed on the outside from the outside is formed in the second cylindrical body .

  According to the present invention, it is possible to confirm that the ball is properly incorporated after the operation of assembling the ball into the cam groove of the cam mechanism, so that the lens barrel can be manufactured easily and appropriately.

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

  FIG. 1 is a cross-sectional perspective view of an essential part showing the configuration of a cam barrel drive cam groove 8g, a fixed barrel ball follower 9b, and a fixed barrel ball follower window 8k in the lens barrel according to the embodiment of the present invention. is there.

  FIG. 2 is an external perspective view of a camera equipped with a lens barrel according to an 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 impact receiving portion 14a provided on the CCD holder 14 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.

  As shown in FIGS. 2 and 3, a collapsible lens barrel 2 is provided in front of a digital camera 1 as an optical apparatus.

  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 is fixed between the inner circumference of the first group lens holder 3 and the outer circumference side of the second group lens holder 4 so as to function as a cam barrel 8 and a straight guide cylinder. The cylinder 9 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 FIGS. 1 and 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, through-hole-like two-group rectilinear 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 FIG. 7, 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, the cam cylinder 8 is rotatably supported on the outer periphery of the fixed cylinder 9 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. Is supported so that it can rotate.

  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). The CCD holder 14 is provided with a CCD holder stopper 14b (shown in 6). 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 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, in the barrel 2 configured as described above, the fixed barrel ball follower window 8k shown in FIGS. 1 and 17 will be described.

  The lens barrel 2 is configured such that the bottom surface of the cam cylinder drive cam groove 8g does not contact the fixed cylinder ball follower 9b. Therefore, in this cam cylinder drive cam groove 8g, even if a hole penetrating the cam cylinder 8 is provided on the bottom surface of the groove, the operation of the fixed cylinder ball follower 9b is not hindered. Therefore, as shown in FIG. 1, a fixed cylinder ball follower window 8k is formed on the bottom surface of the cam cylinder drive cam groove 8g.

  The state in which the fixed cylinder ball follower 9b can be seen from the fixed cylinder ball follower window 8k is a phase in which the first group rectilinear groove 3d of the first group lens holder 3 is fitted to the first group rectilinear key 9c as shown in FIG.

  For this reason, it becomes possible to confirm the incorporation of the fixed cylinder ball follower 9b immediately before the first group lens holder 3 covers the fixed cylinder ball follower window 8k, and the assemblability is improved.

  Further, the fixed cylinder ball follower window 8k is provided in a phase other than the use range of the cam cylinder drive cam groove 8g from the wide shooting position to the tele shooting position, and the fixed cylinder ball follower window 8k is not deteriorated in accuracy of the cam cylinder drive cam groove 8g. It becomes possible to confirm the incorporation of the follower 9b.

  That is, in the lens barrel according to the present embodiment, as shown in FIGS. 1, 17, and 18, the tube hole of the cam cylinder 8 is inserted on the outer periphery of the fixed cylinder 9 and can be rotated around the optical axis. And mounted so as to be movable in the direction of the optical axis. At the same time, in this barrel 2, the cam barrel 8 is moved in the optical axis direction in conjunction with the rotational movement of the cam barrel 8, and therefore, between the inner peripheral portion of the cam barrel 8 and the outer peripheral portion of the fixed barrel 9. A cam mechanism having a structure in which a ball is engaged with the cam groove is configured.

  In order to constitute a cam mechanism having a structure in which a ball is engaged with the cam groove, a cam curve having a lift (lift) for moving the cam cylinder 8 by a predetermined distance in the optical axis direction on the inner peripheral portion of the cam cylinder 8 The cam cylinder drive cam groove 8g formed in the above is formed. The cam cylinder driving cam groove 8g is formed as a groove having a substantially V-shaped cross section. The cam cylinder drive cam groove 8g is configured to roll so as to sandwich a fixed cylinder ball follower 9b as a follower between both side surfaces of the V-shape.

  The cam cylinder drive cam groove 8g may be formed in an inverted isosceles trapezoidal shape with a corner serving as a bottom having a V-shaped cross section. Further, the cam cylinder drive cam groove 8g may be formed in a cross-sectional shape such that a rectangular thin groove is continuous with a bottom portion having a V-shaped cross section.

  Further, in order to constitute a cam mechanism having a structure in which a ball is engaged with the cam groove, the outer periphery of the fixed cylinder 9 is in a receiving recess provided at a predetermined position corresponding to the cam cylinder driving cam groove 8g. A spherical fixed cylinder ball follower 9b is mounted to freely rotate.

  As shown in FIG. 1, the fixed cylinder ball follower 9b attached to the fixed cylinder 9 is configured such that when the cam cylinder 8 is fitted to the outer peripheral portion of the fixed cylinder 9, the fixed cylinder ball follower 9b is a cam cylinder drive cam. Set in the groove 8g.

Further, in this lens barrel, a fixed cylinder ball follower window 8k, which is a through hole communicating with the bottom of the cam cylinder drive cam groove 8g, is drilled at a predetermined position on the outer peripheral surface of the cam cylinder 8. The predetermined position for drilling the fixed cylinder ball follower window 8k is set by selecting the position where the fixed cylinder ball follower 9b is present when the cam cylinder 8 mounted on the fixed cylinder 9 is not required to have positional accuracy. .
For example, the predetermined position where the fixed cylinder ball follower window 8k is perforated avoids the range where the fixed cylinder ball follower 9b is located in the shooting area when in the wide shooting state or the tele shooting state, and is not in the retracted position or the shooting area. Set to the position of.

  Thus, when the fixed cylinder ball follower window 8k is set at a position other than the imaging area, it is possible to prevent the accuracy of the cam cylinder driving cam groove 8g in the imaging area from being deteriorated. This is because if the fixed cylinder ball follower window 8k is provided in the cam cylinder drive cam groove 8g portion of the cam cylinder 8, the strength around the fixed cylinder ball follower window 8k decreases, and the accuracy of the cam cylinder drive cam groove 8g decreases. . Therefore, in this cam cylinder 8, by providing the fixed cylinder ball follower window 8k on the drive cam groove other than the imaging area of the cam cylinder driving cam groove 8g, the accuracy within the imaging area of the cam cylinder driving cam groove 8g is improved. Can be maintained.

  Further, when the cam cylinder 8 is formed by resin molding, if the irregular shape for providing the fixed barrel ball follower window 8k is present in the mold, the flow of the resin is inhibited, so that the cam around the irregular shape at the time of molding. The dimensional accuracy of the groove decreases. Therefore, in this cam cylinder 8, the fixed cylinder ball follower window 8k is provided at a location other than the imaging area in the cam cylinder driving cam groove 8g, thereby reducing the dimensional accuracy within the imaging area of the cam cylinder driving cam groove 8g. To prevent.

  Further, the predetermined position for drilling the fixed cylindrical ball follower window 8k is set to a position where the fixed cylindrical ball follower window 8k can be seen simultaneously with the first group linear key 9c. In this case, when the first group lens holder 3 is mounted on the outer periphery of the cam cylinder 8 assembled to the fixed cylinder 9, the presence of the fixed cylinder ball follower 9b can be confirmed from the fixed cylinder ball follower window 8k. Convenient. This is because when the first group rectilinear key 9c and the first group rectilinear groove 3d of the first group lens holder 3 are visually aligned, the fixed cylindrical ball follower window 8k can be viewed at the same time.

  Further, when the fixed cylinder ball follower window 8k is provided, it is possible to confirm that the fixed cylinder ball follower 9b is not dropped immediately before the first group lens holder 3 is mounted on the outer peripheral portion of the cam cylinder 8. Assembling performance can be improved.

  Further, in this cam cylinder 8, since the fixed cylinder ball follower window 8k is opened at a position where the fixed cylinder ball follower 9b does not roll at the bottom of the cam cylinder drive cam groove 8g, the fixed cylinder ball follower 9b is fixed to the fixed cylinder ball follower. It does not fit in the window 8k.

  In the above-described embodiment, the configuration in which the cam cylinder 8 is provided with the cam cylinder drive cam groove 8g and the fixed cylinder 9 is provided with the fixed cylinder ball follower 9b has been described.

  However, the present invention is not limited to this, and a ball follower is provided on the inner periphery of the cam cylinder 8 and a drive cam groove is provided on the outer periphery of the fixed cylinder 9. At the same time, the cam cylinder 8 is formed by drilling a ball follower window for viewing the ball follower in the receiving recess provided in the cam cylinder 8. Alternatively, a ball follower window for looking into the ball follower in the cam cylinder driving cam groove provided in the fixed cylinder 9 may be formed in the fixed cylinder 9.

  That is, in the lens barrel of the present invention, the outer cylinder (cam cylinder 8) is movably assembled to the outer side of the inner cylinder (fixed cylinder 9). A cam mechanism including a drive cam groove (for example, a cam cylinder drive cam groove 8g) and a ball follower (for example, a fixed cylinder ball follower 9b) is disposed between the inner cylinder and the outer cylinder. Thus, the relative movement is guided.

  Further, in this lens barrel, the ball follower window, which is a through hole for looking into the ball follower disposed between the inner cylinder and the outer cylinder from the outside, is provided with the inner cylinder or the outer cylinder. It is constructed by drilling into at least one of the body. By comprising in this way, presence of a ball follower can be confirmed through the ball follower window from the outside of an inner cylinder body or an outer cylinder body.

FIG. 4 is a cross-sectional perspective view of an essential part showing an enlarged view of the configuration of a cam barrel drive cam groove, a fixed barrel ball follower, and a fixed barrel ball follower window in a lens barrel according to an embodiment of the present invention. 1 is an external perspective view of a camera 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 impact receiving part provided in the CCD holder in the lens-barrel concerning embodiment of this invention. It is a perspective view which takes out and shows the ball check window provided in the cam cylinder in the lens barrel concerning the embodiment of the present invention. It is a perspective view which takes out and shows the fixed cylinder ball follower and fixed cylinder ball spring part which were provided in the fixed cylinder in the lens barrel concerning an embodiment of the invention.

Explanation of symbols

L1 1st lens L2 2nd lens L3 3rd lens L4 4th lens 1 Camera 2 Camera barrel 8 Cam barrel 8g Cam barrel drive cam groove 8k Fixed barrel ball follower window 9 Fixed barrel 9b Fixed barrel ball follower

Claims (4)

The first cylinder and the second cylinder are provided by a cam mechanism including a cam groove and a ball follower between the first cylinder and a second cylinder provided outside the first cylinder. In a lens barrel that moves the body relatively in the optical axis direction ,
A lens having a through hole formed in the second cylinder for viewing the ball follower disposed between the first cylinder and the second cylinder from the outside. A lens barrel. 2. The through-hole is formed so as to open to a position where it does not contact the ball follower in the cam groove formed from the outer peripheral portion to the inner peripheral portion of the second cylindrical body . the lens barrel according to. In said cam groove is formed in a V-shaped groove, said V-shaped cam groove from the outer peripheral portion of the second tubular body forming the inner periphery of the second cylindrical body, said ball follower The lens barrel according to claim 2 , wherein the through-hole penetrating so as to open at a bottom portion not in contact with the lens barrel is formed. 4. The lens barrel according to claim 2, wherein the through hole is formed outside a range of an imaging region where the ball follower is located on the cam groove when in the imaging state . 5.

Images