JP6700801B2 - Lens barrel and imaging device - Google Patents

Description

  The present invention relates to a lens barrel having an image blur correction mechanism, and an imaging device such as a silver halide camera, a digital camera, a digital video camera, etc., in which the lens barrel is mounted.

  In a lens barrel mounted on an image pickup device such as a digital camera, in order to prevent image deterioration due to camera shake or the like, by shifting a part of the lenses of the photographing lens group, a blur of a subject image formed on the image pickup surface can be prevented. Some have an image blur correction mechanism for correction.

  Further, as a mechanism for guiding the lens of the photographing lens group straight in the direction of the optical axis in a state where the rotation of the lens is restricted, there are provided two straight-moving mechanisms of a first straight-moving groove and a first straight-moving key, and a second straight-moving groove and second straight-moving key. A lens barrel has been proposed (Patent Document 1). In this proposal, the two rectilinear mechanisms are provided with a region where the rectilinear key and the rectilinear groove engage and a region where they do not engage, and in the region where the cam groove of the cam barrel and one rectilinear groove intersect, the other rectilinear groove is formed. The straight-ahead key engages.

  In addition, when the linear movement member holding the optical element is moved linearly in the optical axis direction by the rotation of the rotary ring, it is divided into a plurality of different movement ranges to guide the linear movement member in the optical axis direction. A lens barrel including a guide member is disclosed (Patent Document 2).

JP 2012-63755 A JP, 2011-8046, A

  However, in both of Patent Documents 1 and 2 described above, a plurality of rectilinear mechanisms are engaged or disengaged depending on the area. Therefore, only by engaging a part of the straight-moving mechanisms of the plurality of straight-moving mechanisms, vibration when the lens of the image blur correction mechanism is shifted may be amplified, and an oscillation phenomenon may occur in the lens barrel. Especially when the lens is heavy, an oscillation phenomenon is likely to occur.

  Therefore, an object of the present invention is to provide a technique capable of preventing the oscillation phenomenon of the lens barrel caused by the vibration when the lens of the image blur correction mechanism is shifted.

To achieve the above object, a lens barrel of the present invention includes a first cylinder which moves the cam barrel, by Ri in the optical axis direction to the rotation of the cam barrel fitted into the cam barrel, the anti-shake the second cylinder and said second cylinder to the lens holding member that moves in a direction different from the optical axis is supported to and move the by Ri optical axis direction to the rotation of the cam barrel fitted in the cam barrel for A guide barrel for movably guiding the second barrel in the optical axis direction in a state in which the rotation of the second barrel is restricted, the second barrel with respect to the third groove formed in the guide barrel. has a straight pin is fitted so as to be movable in the optical axis direction Te, the second cylinder may have a first shake prevention pin that is movably engaged with the first cylinder with respect to the optical axis The first damping pin is fitted in the first groove formed in the first tube so as to be movable in the optical axis direction, and the first damping pin fits in the first groove. In contrast, the first cylinder is in radial contact with the first groove and is not in contact with the first groove in the circumferential direction of the first cylinder .

  According to the present invention, it is possible to prevent the oscillation phenomenon of the lens barrel caused by the vibration when the lens of the image blur correction mechanism is shifted.

It is a perspective view of a lens barrel which is an example of an embodiment of the present invention. FIG. 2 is an exploded perspective view of the lens barrel shown in FIG. 1. It is sectional drawing in the collapsed position of the lens barrel shown in FIG. FIG. 2 is a sectional view of the lens barrel shown in FIG. 1 at a photographing position (WIDE position). FIG. 2 is a sectional view of the lens barrel shown in FIG. 1 at a photographing position (TELE position). It is a perspective view of an assembly of a fixed cylinder, a 6th group base, and a sensor holder. It is a perspective view which decomposed|disassembled the fixed cylinder, the 6th group base, and the sensor holder. It is a development view of the inner peripheral side of the cam barrel. It is an exploded perspective view of a second group unit. It is a block diagram of the control part which controls a 2nd group unit. It is a perspective view of an assembly of a 3rd lens holder, a 4th lens holder, and a 5th lens holder. FIG. 7 is a partial perspective view of the lens barrel at a photographing position (WIDE position). It is a perspective view showing the relationship between the second group unit and the fixed barrel at the photographing position (WIDE position) of the lens barrel. It is sectional drawing which follows the direction orthogonal to an optical axis in the position of the 2nd rectilinear key of a 2nd group base. FIG. 15 is a partially enlarged view of FIG. 14. It is sectional drawing which follows the direction orthogonal to an optical axis in the position of the straight advance key of a fixed cylinder. FIG. 17 is a partially enlarged view of FIG. 16. It is sectional drawing which follows the direction orthogonal to an optical axis in the position of the follower pin of a 2nd group base. FIG. 19 is a partially enlarged view of FIG. 18. It is a partially expanded view in the position of the 3rd rectilinear key shown in FIG.

  Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of a lens barrel that is an example of an embodiment of the present invention. FIG. 2 is an exploded perspective view of the lens barrel shown in FIG. FIG. 3 is a sectional view of the lens barrel shown in FIG. 1 at a retracted position. FIG. 4 is a sectional view of the lens barrel shown in FIG. 1 at a photographing position (WIDE position). FIG. 5 is a sectional view of the lens barrel shown in FIG. 1 at a photographing position (TELE position). In the present embodiment, a zoom type lens barrel mounted in an image pickup device such as a silver halide camera, a digital camera, a digital video camera is taken as an example.

  As shown in FIGS. 1 to 5, the lens barrel 10 of this embodiment includes a first group lens holder 110, a second group lens holder 230 (lens holding member), and a third group lens holder 310. Further, the lens barrel 10 includes a fourth group lens holder 410, a fifth group lens holder 510, a sixth group lens holder 610, a fixed barrel 700 (guide barrel), and a cam barrel 800.

  The first group lens holder 110 holds the first group lens 100. Three follower pins 120 are provided at substantially equal intervals in the circumferential direction on the outer peripheral portion of the end portion of the first group lens holder 110 on the image plane side. The first group lens holder 110 corresponds to an example of the first cylinder of the present invention.

  The second group lens holder 230 holds the second group lens 200, which is a shift lens (anti-vibration lens), and is movably supported with respect to the second group base 210 in a plane orthogonal to the optical axis. Three follower pins 220 are provided at substantially equal intervals in the circumferential direction on the outer peripheral portion of the image-side end of the second group base 210. The second group base 210 corresponds to an example of the second cylinder of the present invention.

  The third group lens holder 310 holds the third group lens 300, and the fourth group lens holder 410 holds the fourth group lens 400. A follower pin 420 is provided on the fourth group lens holder 410.

  The fifth group lens holder 510 holds the fifth group lens 500. The fifth group lens holder 510 is provided with a follower pin 520 and a static pressure pin 530 (not shown). Further, the third group lens holder 310 and the light amount adjusting member 540 are fixed to the fifth group lens holder 510 with screws or the like.

  The 6-group lens holder 610 holds the 6-group lens 600, which is a focus lens, and is supported by two guide bars 630 and 640 fixed to the 6-group base 620 so as to be movable in the optical axis direction. Three static pressure pins 621 are integrally formed on the sixth group base 620 at substantially equal intervals in the circumferential direction.

  A yoke 660 arranged so as to surround the magnet 650 is fixed to the sixth group base 620. A coil 611 is fixed to the sixth group lens holder 610 by adhesion or the like. The coil 611 is externally inserted in the yoke 660 and is arranged so as to face the magnet 650 in the radial direction. Therefore, when the coil 611 of the sixth group lens holder 610 is energized, a Lorentz force acts on the coil 611 due to the magnetic field of the magnet 650, whereby the sixth group lens holder 610 is driven in the optical axis direction and a focusing operation is performed.

  FIG. 6 is a perspective view of an assembly of the fixed barrel 700, the sixth group base 620, and the sensor holder 910. FIG. 7 is an exploded perspective view of the fixed barrel 700, the sixth group base 620, and the sensor holder 910.

  As shown in FIGS. 6 and 7, the sensor holder 910 holds the image sensor 900. The sensor holder 910 is provided with a zoom drive unit 920. Further, the sixth group base 620 and the fixed barrel 700 are fixed to the sensor holder 910 with screws or the like.

  The fixed barrel 700 regulates rotation of the first group lens holder 110, the second group lens holder 230 (second group base 210), the fourth group lens holder 410, the fifth group lens holder 510, and the sixth group lens holder 610. Three follower pins 701 and three static pressure pins 702 are integrally formed on the outer peripheral portion of the fixed barrel 700 at substantially equal intervals in the circumferential direction.

  Further, on the outer peripheral portion of the fixed barrel 700, a straight advance key 700A and a first straight advance groove 700B (third groove) are provided at three locations at substantially equal intervals in the circumferential direction. The rectilinear key 700A and the first rectilinear groove 700B regulate the rotation of the first group lens holder 110 and the second group base 210 that move in the optical axis direction. Further, guide bars 710 and 720 (see FIG. 2) are incorporated in the fixed barrel 700, and the guide bars 710 and 720 are arranged in the optical axis direction while the rotation of the fourth group lens holder 410 and the fifth group lens holder 510 is restricted. You can move to.

  FIG. 8 is a development view of the inner peripheral side of the cam barrel 800. By rotating the cam barrel 800, the first group lens holder 110, the second group lens holder 230 (second group base 210), the fourth group lens holder 410, the fifth group lens holder 510, and the sixth group lens holder 610 are moved in the optical axis direction. Drive to.

  A first group cam groove 801 (see FIG. 2) that the follower pin 120 of the first group lens holder 110 engages and follows is formed on the outer peripheral portion of the cam barrel 800. As shown in FIG. 8, cam grooves 802, 804, 805, 807 and cam grooves 806, 808, 809 are formed on the inner peripheral portion of the cam barrel 800.

  The follower pin 220 of the second group base 210 is cam-engaged in the cam groove 802, the follower pin 420 of the fourth group lens holder 410 is cam-engaged in the cam groove 804, and the fifth group lens holder 510 is in the cam groove 805. The follower pin 520 is engaged with the cam. The follower pin 701 of the fixed barrel 700 is cam-engaged with the cam groove 807.

  The cam grooves 806, 808, and 809 have a fixed gap with respect to the static pressure pin 530 of the fifth group lens holder 510, the static pressure pin 702 of the fixed barrel 700, and the static pressure pin 621 of the sixth group base 620, respectively. It is arranged to face each other. The cam groove 805 and the cam groove 806 have the same locus, and the cam groove 807 and the cam groove 808 have the same locus.

  Further, as shown in FIG. 8, the cam grooves 807, 808 corresponding to the follower pin 701 and the static pressure pin 702 of the fixed barrel 700 are open to the subject side (upper side in FIG. 8), and the static pressure pin of the sixth group base 620. The cam groove 809 corresponding to 621 is open to the image surface side. Therefore, the fixed barrel 700 is incorporated into the cam barrel 800 from the subject side, and the sixth group base 620 is incorporated from the image plane side.

  A gear portion 810 (see FIG. 2) is provided on the outer peripheral portion of the end of the cam barrel 800 on the image side, and a gear train (not shown) of the zoom drive portion 920 meshes with the gear portion 810. As a result, the power of the zoom drive unit 920 is transmitted to the gear unit 810, and the cam barrel 800 is rotationally driven.

  Next, a zooming operation of the lens barrel 10 having the above configuration will be described. First, when energization of a zoom motor (not shown) of the zoom drive unit 920 is started, power of the zoom motor is transmitted to the cam barrel 800 via a gear unit 810 meshing with a gear train connected to the zoom motor. As a result, the cam barrel 800 is rotationally driven, and the cam engagement between the cam groove 807 and the follower pin 701 of the fixed barrel 700 fixed to the sensor holder 910 causes the cam barrel 800 to rotate and emit light along the cam groove 807. Move in the axial direction.

  Then, as the cam barrel 800 rotates, the first group lens holder 110 in which the follower pin 120 engages with the first group cam groove 801 (see FIG. 2) follows the first group cam groove 801 and moves in the optical axis direction. Further, with the rotation of the cam barrel 800, the second group base 210 in which the follower pin 220 engages in the cam groove 802 follows the cam groove 802, and the fourth group lens holder 410 in which the follower pin 420 engages in the cam groove 804, It follows the cam groove 804 and moves in the optical axis direction. Further, as the cam barrel 800 rotates, the fifth group lens holder 510, in which the follower pin 520 engages with the cam groove 805, follows the cam groove 805 and moves in the optical axis direction.

  At this time, as described above, the rotation of the first group lens holder 110 and the second group base 210 that move in the optical axis direction is restricted by the straight-movement key 700A and the first straight-movement groove 700B of the fixed barrel 700. Further, the guide bars 710 and 720 restrict the rotation of the fourth group lens holder 410 and the fifth group lens holder 510 that move in the optical axis direction.

  In this way, the amount of movement of the cam barrel 800 itself in the optical axis direction and the amount of movement of each lens holder 110, 230, 410, 510 with respect to the cam barrel 800 in the optical axis direction are combined, and the optical axis direction of each lens group is combined. The zoom operation is performed by changing the interval at. The driving of the third group lens holder 310 will be described later.

  Next, with reference to FIG. 9, the second group unit that constitutes the image blur correction mechanism will be described. FIG. 9 is an exploded perspective view of the second group unit. As shown in FIG. 9, the second group unit includes a second group lens holder 230 and a second group base 210, and four magnets 231 are integrally formed in the second group lens holder 230 by insert molding. Four coils 240 are fixed to the second group base 210 at positions radially opposed to the four magnets 231 of the second group lens holder 230.

  The second group lens holder 230 and the second group base 210 are assembled with the three ball members 260 sandwiched in the optical axis direction by the biasing forces of the four coil springs 250. The Hall element holder 270 holds two Hall elements 271 that detect the magnetic fields of the two magnets 231 that are orthogonally arranged among the four magnets 231 of the second group lens holder 230. The hall element holder 270 is fixed to the second group base 210 while being sandwiched by the second group cover 280.

  Next, image blur correction control by the second group unit will be described with reference to FIGS. 9 and 10. FIG. 10 is a block diagram of a control unit that controls the second group unit.

  As shown in FIG. 9, in the driving unit of the second group unit, the Hall element 271, the magnet 231, and the coil 240 are arranged in this order from the subject side to the image plane side. When the coil 240 is energized, a Lorentz force is generated in the coil 240 due to the magnetic field of the magnet 231, and the reaction force acts on the magnet 231. Since the coil 240 is fixed to the second group base 210, this reaction force causes the second group lens holder 230 holding the second group lens 200 to roll the three ball members 260 with respect to the second group base 210. It is possible to freely move in a plane orthogonal to the optical axis via the. The Hall element 271 detects the magnetic field of the magnet 231, and detects the position of the second group lens holder 230 in the plane orthogonal to the optical axis.

  In FIG. 10, a sensor unit 2001 in the pitch direction is composed of, for example, an angular velocity sensor, and the sensor unit 2001 in the vertical direction (pitch direction) of the lens barrel 10 in a normal attitude (an attitude in which the length direction of the image frame substantially matches the horizontal direction). Detects vibration (vibration). The yaw-direction sensor unit 2002 is composed of, for example, an angular velocity sensor, and detects horizontal (yaw-direction) vibration of the lens barrel 10 in a normal posture.

  The image stabilization control units 2003 and 2004 respectively perform image stabilization control in the pitch direction and yaw direction and position control of the second group lens 200 (second group lens holder 230) according to the situation. The image stabilization control units 2003 and 2004 determine and determine the target positions for driving the second group lens 200 so as to cancel the image blur of the subject due to the shake of the lens barrel 10 detected by the sensor units 2001 and 2002, respectively. A corrected position control signal indicating the target position is generated.

  The PID control units 2005 and 2006 obtain control amounts from the corrected position control signals in the pitch direction and yaw direction and the position signal of the second lens group 200, and output position command signals. The drive units 2007 and 2008 drive the second group lens 200 in the direction orthogonal to the optical axis based on the position command signals sent from the PID control units 2005 and 2006, respectively. In the present embodiment, the drive units 2007 and 2008 are composed of the magnet 231 and the coil 240.

  Next, position control of the second group lens 200 in the second group unit will be described. In the position control of the second group lens 200, based on the shake signal (angular velocity signal) representing the shake in the pitch direction of the lens barrel 10 and the yaw direction from the sensor unit 2001 in the pitch direction and the sensor unit 2002 in the yaw direction, The second group lens 200 is driven in each direction. Then, the Hall element 271 detects the magnetic field of the magnet 231, and the position signals of the second group lens 200 are sent to the PID control units 2005 and 2006, respectively.

  The PID control units 2005 and 2006 perform feedback control so that the position signals of the second lens group 200 converge on the corrected position control signals sent from the image stabilization control units 2003 and 2004, respectively. The PID control units 2005 and 2006 drive the drive unit 2007, so that the second group lens 200 is driven to the target position determined by the image stabilization control units 2003 and 2004 according to the detected position of the second group lens 200. The feedback control of 2008 is performed.

  At this time, the PID control units 2005 and 2006 perform PID control that combines P control (proportional control), I control (integral control), and D control (differential control). The image stabilization control units 2003 and 2004 make corrections to move the position of the second lens group 200 in the direction for correcting image blur based on the shake information from the pitch direction sensor unit 2001 and the yaw direction sensor unit 2002, respectively. Outputs a position control signal. Accordingly, even if camera shake occurs in the lens barrel 10, it is possible to prevent blurring of the subject image formed on the imaging surface.

  Next, the relationship among the third group lens holder 310, the fourth group lens holder 410, and the fifth group lens holder 510 will be described with reference to FIGS. 3 to 5 and 11. FIG. 11 is a perspective view of an assembly of the third group lens holder 310, the fourth group lens holder 410, and the fifth group lens holder 510.

  As shown in FIG. 11, the hole 411 of the fourth group lens holder 410 and the hole 511 of the fifth group lens holder 510 are fitted to the guide bar 710. A guide bar 720 is engaged with the rotation stop portion 412 of the fourth group lens holder 410 and the rotation stop portion 512 of the fifth group lens holder 510. As a result, the fourth group lens holder 410 and the fifth group lens holder 510 are movably supported in the optical axis direction while being restricted in rotation by the guide bars 710 and 720.

  The third group lens holder 310 and the light amount adjusting member 540 (see FIGS. 3 to 5) are fixed to the fifth group lens holder 510 with the fourth group lens holder 410 interposed therebetween by screws or the like. The fourth group lens holder 410 is provided with a follower pin 420 that engages with the cam groove 804, and the fifth group lens holder 510 is provided with a follower pin 520 that is engaged with the cam groove 805. As a result, the rotation of the cam barrel 800 causes the fifth group lens holder 510 to move integrally with the third group lens holder 310 and the light amount adjusting member 540 in the optical axis direction, and the fourth group lens holder 410 forms the light amount adjusting member 540. It moves in the optical axis direction with the fifth group lens holder 510.

  Further, in order to prevent the follower pin 520 from coming off the cam groove 805 and the deformation and damage of the peripheral portion of the follower pin 520 when an external force is applied to the fifth group lens holder 510 due to a drop impact or the like, a static pressure pin 530 is provided. It has been incorporated. The cam groove 806 corresponding to the static pressure pin 530 has a constant gap between the static pressure pin 530 and the cam groove 806 and the static pressure pin 530 do not come into contact with each other in a normal zoom operation. It comes into contact only when an external force is applied due to a drop impact or the like.

  Next, the relationship among the first group lens holder 110, the second group base 210, and the fixed barrel 700 will be described with reference to FIGS.

  FIG. 12 is a partial perspective view of the lens barrel 10 at the photographing position (WIDE position). The second group unit including the second group lens holder 230 and the second group base 210 is arranged inside the first group lens holder 110 and the cam barrel 800.

  FIG. 13 is a perspective view showing the relationship between the second group unit and the fixed barrel 700 at the photographing position (WIDE position) of the lens barrel 10. As shown in FIG. 13, the second rectilinear key 210A (second damping pin) of the second group base 210 and the first rectilinear key 220B (straight pin) around the follower pin 220 of the second group base 210 have the same phase as the optical axis. It is arranged to overlap in the direction. Further, the straight-movement key 700A and the first straight-movement groove 700B of the fixed barrel 700 are also arranged in the same phase so as to overlap in the optical axis direction.

  The center of gravity of the second group unit is disposed between the plane of the second group base 210 orthogonal to the optical axis direction at the first rectilinear key 220B position and the plane of the second rectilinear key 210A orthogonal to the optical axis direction. ing.

  Of the first rectilinear key 220B and the second rectilinear key 210A which are arranged apart from each other in the optical axis direction of the second group base 210, the first rectilinear key 220B arranged on the image surface side is the first rectilinear key 220B of the fixed barrel 700. It fits in the straight groove 700B and plays a role of a main guide. On the other hand, the second rectilinear key 210A arranged on the subject side is press-fitted into the second rectilinear groove 110A (second groove) (see FIG. 15) of the first group lens holder 110 to serve as a sub guide. There is.

  The fitting force between the second straight advance key 210A and the second straight advance groove 110A is set to be larger than the fit force between the first straight advance key 220B and the first straight advance groove 700B. The press-fitting fitting portion of the second straight-movement key 210A and the second straight-movement groove 110A may be set to charge the load inward in the radial direction by fitting with a spring property.

  FIG. 14 is a sectional view taken along the direction orthogonal to the optical axis at the position of the second rectilinear key 210A of the second group base 210 shown in FIG. FIG. 15 is a partially enlarged view of FIG. As shown in FIGS. 14 and 15, the second rectilinear key 210A of the second group base 210 is press-fitted in the second rectilinear groove 110A formed in the inner peripheral portion of the first group lens holder 110 in the radial direction. It As a result, the second group base 210 and the first group lens holder 110 are relatively linearly moved in the optical axis direction while the rotation is restricted. Further, as described above, the second straight-movement key 210A of the second group base 210 is arranged in the same phase as the first straight-movement groove 700B of the fixed barrel 700 in the optical axis direction so as to overlap with the first straight-movement key. The groove 700B is arranged at a position where it cannot be seen. The second rectilinear key 210A of the second group base 210 is in contact with the second rectilinear groove 110A in the circumferential direction of the first group lens holder 110, and is in the radial direction of the first group lens holder 110 with respect to the second rectilinear groove 110A. I don't contact you.

  16 is a cross-sectional view of the fixed barrel 700 shown in FIG. 13 along the direction orthogonal to the optical axis at the position of the rectilinear key 700A. FIG. 17 is a partially enlarged view of FIG. As shown in FIGS. 16 and 17, the rectilinear key 700A of the fixed barrel 700 is fitted in the second rectilinear groove 110A formed in the inner peripheral portion of the first group lens holder 110 in the radial direction. As a result, the first-group lens holder 110 moves straight in the optical axis direction with respect to the fixed barrel 700 in a state in which the rotation is restricted.

  18 is a sectional view taken along the direction orthogonal to the optical axis at the follower pin 220 position of the second group base 210 shown in FIG. FIG. 19 is a partially enlarged view of FIG. As shown in FIG. 18 and FIG. 19, the first rectilinear key 220B arranged around the follower pin 220 of the second group base 210 is different from the first rectilinear groove 700B formed in the inner peripheral portion of the fixed barrel 700. It is fitted in the radial direction. As a result, the second group base 210 is linearly moved with respect to the fixed barrel 700 in the optical axis direction in a state where the rotation is restricted.

  In this way, the second group base 210 is always fitted in the first group lens holder 110 and the fixed barrel 700 in the radial direction so as to be movable in the optical axis direction, and its rotation is restricted. That is, the second rectilinear key 210A of the second group base 210 and the rectilinear key 700A of the fixed barrel 700 are fitted into the second rectilinear groove 110A of the first lens group holder 110, and the first rectilinear groove 700B of the fixed barrel 700 is fitted into the first rectilinear groove 700B. The first rectilinear key 220B of the second group base 210 is fitted. As a result, a force that damps the vibration acts due to the frictional force or the like at these fitting portions, so that even if the second lens group holder 230 shifts with respect to the second lens group base 210 in a plane orthogonal to the optical axis, the shift occurs. It is possible to prevent the oscillation phenomenon of the lens barrel 10 due to the vibration at the time.

  FIG. 20 is a partially enlarged view of the position of the third rectilinear key 210B (first vibration suppressing pin) shown in FIG. As shown in FIG. 20, the third rectilinear key 210B of the second group base 210 is radially fitted to the third rectilinear groove 110B (first groove) formed in the inner peripheral portion of the first group lens holder 110. Has been done. Accordingly, the second group base 210 and the first group lens holder 110 are relatively linearly moved in the optical axis direction in a state where the rotation is restricted. The third rectilinear key 210B of the second group base 210 contacts the third rectilinear groove 110B in the radial direction of the first group lens holder 110. Further, the second rectilinear key 210B of the second group base 210 does not contact the third rectilinear groove 110B in the circumferential direction of the first group lens holder 110.

  The fitting portion between the third rectilinear key 210B and the third rectilinear groove 110B is set so that the first group lens holder 110 charges the load inward in the radial direction toward the optical axis center with respect to the second group base 210. ing. This makes it possible to more effectively prevent the above-described oscillation phenomenon of the lens barrel 10 due to the fact that the barycentric position of the second group unit is arranged between the first rectilinear key 220B and the second rectilinear key 210A.

Here, the mass of the first group unit including the first group lens holder 110, the first group lens 100, and the like is m1, and the mass of a portion that does not shift, represented by the second group base 210 of the second group unit, is m2. At this time, assuming that the constants when modeling the vibration of each group unit as simple vibrations are k1 and k2, the natural frequency when the constant k1 is the following formula 1, and the natural frequency when the constant k2 is Equation 2 of

If it is assumed that the unit that does not shift in the first group unit and the unit that does not shift are completely integrated, the natural frequency is given by the following equation with the constant k12.

  At this time, since the denominator of the mathematical expression becomes large by adding the masses (m1, m2) of the integrated portions in the two group units, the natural frequency is largely shifted compared with the case where each group unit vibrates individually. be able to. As a result, the oscillation phenomenon of the lens barrel 10 can be prevented by shifting the frequency when the integrated portion oscillates. If the vibration energy of the vibration generated by the movement of the second lens group, which is a shift lens, is the same, the first group unit and the non-shifting portion of the second group unit are integrated to increase the mass. As a result, the amplitude when vibrating with the same vibration energy can also be reduced.

  Since the zoom operation is actually performed, it is impossible to completely integrate the first group lens holder 110 and the second group base 210. On the other hand, as described above, the straight-movement keys of the second group base 210 that are fitted to the first-group lens holder 110 are provided, for example, before and after the center of gravity of the second-group base 210 such as the first straight-movement key 220B and the second straight-movement key 210A. Place more than before. Alternatively, the load of the first group lens holder 110 is charged radially inward of the second group base 210 toward the center of the optical axis at the fitting portion of the third straight key 210B and the third straight groove 110B. As a result, the natural frequency can be shifted and the amplitude when vibrating can be reduced by bringing the first-group unit and the non-shift-moving portion of the second-group unit close to an integrated state.

  As described above, in the present embodiment, the oscillation phenomenon of the lens barrel 10 caused by the vibration when the second lens group holder 230 holding the second lens group 200 is shifted in the plane orthogonal to the optical axis is prevented. be able to.

  The configuration of the present invention is not limited to the one illustrated in the above embodiment, and the material, shape, size, form, number, arrangement location, etc. can be appropriately changed without departing from the scope of the present invention. Is.

100 1st group lens 110 1st group lens holder 110A 2nd rectilinear groove 200 2nd group lens 210 2nd group base 210A 2nd rectilinear key 220B 1st rectilinear key 230 2nd group lens holder 700 fixed barrel 700B 1st rectilinear groove 800 cam barrel

Claims (7)

A cam barrel, a first barrel that fits in the cam barrel and moves in the optical axis direction by rotation of the cam barrel, and a lens holding member that moves in a direction different from the optical axis for image blur correction, Also, a second cylinder that fits in the cam cylinder and moves in the optical axis direction by the rotation of the cam cylinder, and a guide that allows the second cylinder to move in the optical axis direction while the rotation of the second cylinder is restricted. In the lens barrel having a guide tube for
The second cylinder has a straight-moving pin fitted to the third groove formed in the guide cylinder so as to be movable in the optical axis direction,
The second barrel has a first damping pin engaged with the first barrel so as to be movable in the optical axis direction,
The first damping pin is fitted in a first groove formed in the first cylinder so as to be movable in the optical axis direction,
The first damping pin is in contact with the first groove in a radial direction of the first cylinder, and is not in contact with the first groove in a circumferential direction of the first cylinder. A lens barrel to be used. The second cylinder is provided with a second vibration suppression pin at a different phase with respect to the first vibration suppression pin in the circumferential direction,
The second damping pin contacts the second groove formed in the first cylinder in the circumferential direction of the first cylinder, and contacts the second groove in the radial direction of the first cylinder. The lens barrel according to claim 1, wherein the lens barrel is not formed.   The lens barrel according to claim 1, wherein the guide barrel guides the first barrel so as to be movable in the optical axis direction in a state where the rotation of the first barrel is restricted. The lens barrel according to claim 2, wherein the second suppressing pin and the straight-moving pin are arranged in the same phase when viewed from the optical axis direction. In the optical axis direction, the center-of-gravity position of the image blur correction mechanism having the lens holding member, a lens barrel according to claim 2, characterized in that located between the second suppression vibration pins and the straight pin. 3. The lens mirror according to claim 2 , wherein the fitting force between the second damping pin and the second groove is set to be less than the fitting force between the rectilinear pin and the third groove. Cylinder.   An image pickup apparatus comprising: the lens barrel according to any one of claims 1 to 6; and an image pickup element.