JP4859339B2 - Lens barrel - Google Patents

Description

  The present invention relates to a lens barrel.

  As a lens barrel that can be focused by either autofocus (AF) or manual focus (MF), a fixed ring and a concentric movement with this fixed ring, holding the focus lens, can move forward and backward in the optical axis direction. A ring, a distance adjusting ring that is concentric with the fixed ring and rotates around the axis thereof to move the moving ring back and forth in the optical axis direction, an AF motor that rotates the distance adjusting ring, and an axis around the axis And a manual focus ring that rotates the distance adjustment ring by rotating the distance adjustment ring.

Between the distance adjusting ring of the lens barrel and the AF motor, the driving force of the AF motor is transmitted to the distance adjusting ring, but the rotational force of the distance adjusting ring rotated by the manual focus ring is Some have a one-way input / output rotation transmission mechanism that does not transmit to the AF motor.
As a prior art of such a lens barrel, for example, there is Patent Document 1, and if the lens barrel has such a configuration, MF shooting is performed while the AF switch is turned on and AF shooting is possible. be able to.
JP-A-11-202181

  However, in the lens barrel of Patent Document 1, when the AF motor is rotated, the one-way input / output rotation transmission mechanism cannot reliably transmit the rotational torque from the AF motor to the distance adjustment ring. , AF may not be performed.

  An object of the present invention is to provide a lens barrel in which a moving lens can be moved in the optical axis direction by either a driving force by a motor or a manually rotating force of a manual operation ring. An object of the present invention is to provide a lens barrel that can be reliably transmitted to a moving lens.

The lens barrel of the present invention includes a manual operation ring that moves the moving lens in the optical axis direction by manual rotation operation, a motor that drives the moving lens in the optical axis direction, and the driving force when the motor is driven. And a first one-way input / output rotation transmission mechanism that does not transmit the moving force of the moving lens to the motor when the manual operation ring is rotated. The first one-way input / output rotation transmission mechanism has a first axially orthogonal plane orthogonal to an axis parallel to the optical axis, and an input rotary shaft that is rotationally driven by the motor, and the input rotation The shaft is inserted in a relatively rotatable manner and is linked to the manual operation ring, and is formed on a cylindrical output rotating shaft in which the rotational movement and movement of the moving lens in the optical axis direction are interlocked, and the input rotating shaft. Cylindrical output rotation A first circumferentially unequal width space forming portion that forms a first circumferentially unequal width space having an unequal width in the circumferential direction between the inner first rotation transmission cylindrical surface and the first circumference; Inserted into the unequal width space and always brought into contact with the first axially orthogonal plane by the first urging means, and in conjunction with the rotation of the input rotation shaft, the axis of the input rotation shaft And a plurality of first differential rotation members that revolve in the same direction while being delayed with respect to the input rotation shaft, and the first differential rotation is inserted into the first circumferentially unequal width space. A first rotational force transmission member that revolves in the same direction as the first differential rotation member by being pushed by the member; an input gear that is provided on the input rotation shaft and meshes with an output gear of the motor; The first circumferential direction unequal width space forming portion is configured such that the first rotational force transmission member rotated in the circumferential direction is connected to the input rotation shaft. The cylindrical output rotary shaft has a shape that bites between the outer peripheral surface and the first rotation transmission cylindrical surface of the cylindrical output rotary shaft and transmits the rotational force of the input rotary shaft to the cylindrical output rotary shaft. when the rotation is stopped, the motor, by the rotation direction in the immediately preceding time the rotation stop rotating in the reverse direction, without rotating the cylindrical rotary output shaft, the input rotary shaft, when the rotation is stopped It is characterized in that it rotates in the direction opposite to the rotation direction immediately before.

According to another aspect, the lens barrel of the present invention includes a manual operation ring that moves the moving lens in the optical axis direction by manual rotation operation, a motor that drives the moving lens in the optical axis direction, and the motor. A first one-way input / output rotation transmission mechanism that transmits the driving force to the moving lens when driven, and does not transmit the moving force of the moving lens to the motor when the manual operation ring is rotated; In the lens barrel provided, the first one-way input / output rotation transmission mechanism has a first axial orthogonal surface orthogonal to an axis parallel to the optical axis, and is rotationally driven by the motor. A cylindrical input rotary shaft, and a cylindrical input rotary shaft that is inserted into the cylindrical input rotary shaft so as to be relatively rotatable and linked to the manual operation ring. The outer peripheral surface of the cylindrical input rotary shaft forms a first rotation transmission cylindrical surface. Moving the optical axis of the moving lens Between the output rotation shaft coupled to the first rotation transmission cylindrical surface of the output rotation shaft formed on the inner peripheral surface of the cylindrical input rotation shaft. A first circumferential unequal width space forming portion that forms a unequal width space, and the first axial direction always inserted by the first biasing means and inserted into the first circumferential unequal width space. A plurality of second shafts which are brought into contact with the orthogonal plane and revolve in the same direction while being delayed from the cylindrical input rotating shaft around the axis of the cylindrical input rotating shaft in conjunction with the rotation of the cylindrical input rotating shaft. 1 differential rotation member and the first differential rotation member are inserted in the first circumferential unequal width space so as to be movable, and are pushed in the same direction as the first differential rotation member. A first rotational force transmission member that revolves on the cylinder, and an input gear that is provided on the cylindrical input rotary shaft and meshes with the output gear of the motor. In the first circumferentially unequal width space forming portion, the first rotational force transmitting member rotated in the circumferential direction is configured such that the inner peripheral surface of the cylindrical input rotary shaft and the first rotational transmission cylinder of the output rotary shaft. It has a shape that bites between the surfaces and transmits the rotational force of the cylindrical input rotary shaft to the output rotary shaft, and when the rotation of the output rotary shaft is stopped, the motor is rotated in the rotational direction immediately before the rotation stop. By rotating in the opposite direction, the cylindrical input rotation shaft rotates in the direction opposite to the rotation direction immediately before the rotation stop without rotating the output rotation shaft.

  In these aspects, a pair of the first rotational force transmission members are inserted in the first circumferential direction unequal width space side by side in the circumferential direction so as to sandwich the first differential rotation member. It is practical.

  Further, the first circumferential unequal width space forming portion is disposed between the cylindrical output rotation shaft or the first rotation transmission cylindrical surface of the output rotation shaft. It is preferable that a plurality of spaces be formed, and the first differential rotating member and the first rotational force transmitting member be inserted into each first circumferentially unequal width space.

  The first circumferentially unequal width space forming portion may be formed of a non-circular section having at least one surface orthogonal to the radial direction of the input rotation shaft or the cylindrical input rotation shaft.

According to another aspect, the lens barrel of the present invention includes a manual operation ring that moves the moving lens in the optical axis direction by a manual rotation operation, a motor that drives the moving lens in the optical axis direction, and the motor. A first one-way input / output rotation transmission mechanism that transmits the driving force to the moving lens when driven, and does not transmit the moving force of the moving lens to the motor when the manual operation ring is rotated; In the lens barrel provided, the first one-way input / output rotation transmission mechanism has a first axial orthogonal surface orthogonal to an axis parallel to the optical axis, and is rotationally driven by the motor. The rotating shaft and the input rotating shaft are inserted so as to be rotatable relative to each other and linked to the manual operation ring, the rotational movement and the movement of the moving lens in the optical axis direction are interlocked, and the inner peripheral surface thereof is Of the above input rotating shaft Between the cylindrical output rotation shaft forming the first rotation transmission cylindrical surface forming an annular space with the peripheral surface and the first rotation transmission cylindrical surface formed on the input rotation shaft, the annular shape is provided. The first circumferential direction unequal width space forming portion that forms a first circumferential direction unequal width space that is unequal in the circumferential direction that forms a part of the space, and the first biasing means always provides the first urging means. A plurality of first differentials that are brought into contact with an axially orthogonal plane and revolve in the same direction while being delayed with respect to the input rotation shaft about the axis of the input rotation shaft in conjunction with the rotation of the input rotation shaft A rotating member, a retainer that revolves in the same direction as the first differential rotating member by being inserted into the annular space and pressed by the first differential rotating member, and held by the retainer, A first rotational force transmitting member that rotates together with the retainer in a first circumferentially unequal width space; An input gear that meshes with the output gear of the motor, and the first circumferential width unequal space forming portion is configured such that the first rotational force transmission member rotated in the circumferential direction is connected to the input rotation shaft. Between the outer peripheral surface of the cylindrical output rotating shaft and the first rotation transmitting cylindrical surface of the cylindrical output rotating shaft, and the rotational force of the input rotating shaft is transmitted to the cylindrical output rotating shaft. during rotation axis stops, the motor, the rotation direction in the immediately preceding time the rotation stop by rotating in the reverse direction, without rotating the cylindrical rotary output shaft, the input rotary shaft, the rotation stop It is characterized by rotating in the direction opposite to the rotation direction immediately before the hour.

According to another aspect, the lens barrel of the present invention includes a manual operation ring that moves the moving lens in the optical axis direction by a manual rotation operation, a motor that drives the moving lens in the optical axis direction, and the motor. A first one-way input / output rotation transmission mechanism that transmits the driving force to the moving lens when driven, and does not transmit the moving force of the moving lens to the motor when the manual operation ring is rotated; In the lens barrel provided, the first one-way input / output rotation transmission mechanism has a first axial orthogonal surface orthogonal to an axis parallel to the optical axis, and is rotationally driven by the motor. The cylindrical input rotary shaft is inserted into the cylindrical input rotary shaft so as to be relatively rotatable. The rotational movement of the movable input lens moves in the optical axis direction, and the outer peripheral surface thereof is the cylindrical input rotary shaft. Annular between the inner peripheral surface A first rotation transmission cylindrical surface formed between the output rotation shaft linked to the manual operation ring and an inner peripheral surface of the cylindrical input rotation shaft; A first circumferentially unequal width space forming portion that forms a first circumferentially unequal width space that is unequal in the circumferential direction that forms part of the annular space, and a first attachment The cylindrical input rotary shaft is always brought into contact with the first axially orthogonal plane by the biasing means and interlocked with the rotation of the cylindrical input rotary shaft, with the axial center of the cylindrical input rotary shaft as the center. A plurality of first differential rotation members that revolve in the same direction while being delayed, and are inserted into the annular space and pressed by the first differential rotation member, thereby being the same as the first differential rotation members. A retainer that revolves in a direction, and a first that is held by the retainer and that rotates together with the retainer in the first circumferential unequal width space. A rotation force transmitting member; and an input gear that is provided on the cylindrical input rotation shaft and meshes with an output gear of the motor, wherein the first circumferentially unequal width space forming portion is rotated in the circumferential direction. The first rotational force transmission member bites between the inner peripheral surface of the cylindrical input rotary shaft and the first rotational transmission cylindrical surface of the output rotary shaft, and the rotational force of the cylindrical input rotary shaft is a shape that transmits the output rotation shaft, when the rotation stop of the output rotary shaft, the motor, the rotation direction in the immediately preceding time the rotation stop by rotating in the opposite direction, to rotate the output rotating shaft Rather, the cylindrical input rotary shaft rotates in a direction opposite to the rotation direction immediately before the rotation stop.

  Furthermore, in these aspects, the first circumferential direction unequal width space forming portion is disposed between the cylindrical output rotation shaft or the first rotation transmission cylindrical surface of the output rotation shaft. It is preferable that a plurality of circumferentially unequal width spaces are formed, and the first rotational force transmission member is inserted into each first circumferentially unequal width space.

Further, in these aspects, the first circumferential unequal width space forming portion can be a first unequal width groove having a different radial depth depending on the circumferential position .

  In any aspect, the first pressing surface that is parallel to and parallel to the first axially orthogonal surface is provided, and the first urging means always provides the first axially orthogonal surface side. Preferably, a first pressing member that sandwiches the first differential rotating member between the first axially orthogonal plane and the first axially orthogonal plane is provided.

  In any aspect, the input rotation shaft or the cylindrical input rotation shaft is provided with an input gear that meshes with the output gear of the motor, and the motor is turned off when the rotation of the cylindrical output rotation shaft or the output rotation shaft is stopped. The cylindrical output rotary shaft or the output rotary shaft is rotated by rotating the input gear and the output gear by a rotation angle smaller than the backlash of the input gear and the output gear in a direction opposite to the rotation direction immediately before the rotation stop. Instead, it is preferable to rotate the input rotation shaft or the cylindrical input rotation shaft in a direction opposite to the rotation direction immediately before the rotation stop.

  Furthermore, in any aspect, it is preferable that the first rotational force transmission member is a columnar member that faces in a direction parallel to the axis of the input rotation shaft or the cylindrical input rotation shaft.

  Furthermore, in any aspect, by receiving a rotational force from the manual operation ring, or by receiving a rotational force from the cylindrical output rotation shaft or the output rotation shaft, the rotating lens rotates around its axis, A distance adjustment ring that moves in the optical axis direction is provided, and the rotational force of the manual operation ring is transmitted to the distance adjustment ring between the distance adjustment ring and the manual operation ring. It is preferable to provide a second one-way input / output rotation transmission mechanism that does not transmit to the manual operation ring.

  When the second one-way input / output rotation transmission mechanism is provided as described above, the second one-way input / output rotation transmission mechanism is provided on the second manually-operated ring and perpendicular to the optical axis. An axially orthogonal surface, a ring-shaped overlapping portion that overlaps with the distance adjusting ring in a radial direction, and a second facing the ring-shaped overlapping portion of the manually operated ring formed on the inner peripheral surface or the outer peripheral surface of the distance adjusting ring. A second circumferentially unequal width space having an unequal width in the circumferential direction is formed between the rotation transmitting cylindrical surface and the second rotation transmitting cylindrical surface formed in the annular overlap portion of the manual operation ring. Inserted in the second circumferential unequal width space forming portion and the second circumferential unequal width space, and is always brought into contact with the second axially orthogonal plane by the second urging means. In conjunction with the rotation of the manual operation ring, the axial center of the manual operation ring is formed in the second circumferentially unequal width space forming portion. In addition, the second differential rotation member that revolves in the same direction while being delayed from the manual operation ring and the second differential rotation member inserted into the second circumferential unequal width space are pushed by the second differential rotation member. The second rotational force transmission member that revolves in the same direction as the second differential rotation member, and the second circumferential unequal width space forming portion rotates in the circumferential direction. The rotational force transmitting member of the second portion has a shape that bites between the second circumferentially unequal width space forming portion and the second rotationally transmitting cylindrical surface and transmits the rotational force of the manual operation ring to the distance adjusting ring. It is practical to do it.

  Further, it is practical to insert a pair of the second rotational force transmitting members side by side in the circumferential direction so as to sandwich the second differential rotating member in the second circumferential unequal width space. is there.

It is practical that at least a part of the second circumferentially unequal width space forming portion is constituted by a second unequal width groove having a different radial depth depending on the circumferential position .

  Furthermore, it has a second pressing surface facing and parallel to the second axial orthogonal surface, and is always urged toward the second axial orthogonal surface side by the second urging means, It is preferable to provide a second pressing member that sandwiches the second differential rotating member between the second axially orthogonal plane.

  A plurality of the second circumferential unequal width spaces are formed between the second circumferential unequal width space forming portion and the second rotation transmission cylindrical surface of the distance adjusting ring. Preferably, the second differential rotating member and the second rotational force transmitting member are inserted into each second circumferential unequal width space.

  The second rotational force transmitting member is preferably a columnar member facing in a direction parallel to the axis of the manual operation ring.

  In any aspect, the lens barrel can be a focus lens barrel by using the moving lens as a focus lens, the motor as an AF motor, and the manual operation ring as a manual focus ring.

  The lens barrel can be a zoom lens barrel by using the moving lens as a zoom lens, the motor as a zoom motor, and the manual operation ring as a zoom ring.

  According to the present invention, in a lens barrel that can move a moving lens in the optical axis direction by either a driving force by a motor or a manual rotating force of a manual operation ring, the driving force is moved when the motor is driven. It can be transmitted to the lens reliably.

FIGS. 1 to 3 show a first embodiment in which the present invention is applied to a lens barrel 100 in which the photographing state can be switched between auto focus (AF) and manual focus (MF).
First, the overall configuration of the lens barrel 100 will be described.

  A first fixed ring 102 formed with a bayonet portion 102a to be attached to a camera body (not shown) at the rear end (explained with the left side of FIG. 1 as “front” and the right side of FIG. 1 as “rear”); The rear ends of the second fixed ring 104 that are concentric with the first fixed ring 102 and located on the inner peripheral side thereof are fixed by a fixing screw 106, and the front end of the inner peripheral surface of the second fixed ring 104 The fixed lens L1 is held in the part. The longitudinal length of the second fixed ring 104 is longer than that of the first fixed ring 102, and the three fixed guide grooves 104a are provided in the second fixed ring 104 at equal angular intervals in the circumferential direction. Between the rear portions of the first fixed ring 102 and the second fixed ring 104, an annular arrangement space S is formed in a front view, and a manual concentric with the first fixed ring 102 is formed in the arrangement space S. A focus ring (manual operation ring) 108 is disposed so as to be rotatable around the optical axis O. The rotation operation portion 108 a that forms the front end portion of the manual focus ring 108 is located in an annular space formed between the front end portion of the first fixed ring 102 and the front end portion 104 b of the second fixed ring 104. A cam groove 108b that is inclined with respect to each straight guide groove 104a is formed at a position corresponding to the straight guide groove 104a of the manual focus ring 108, and an inner peripheral surface of a rear end portion of the manual focus ring 108 is further formed. An input gear 108c is formed as a whole.

On the inner peripheral side of the second fixed ring 104, a moving ring 110 that is concentric with the first fixed ring 102 is disposed so as to be movable back and forth in the direction of the optical axis O and not rotatable around the optical axis O. The ring 110 holds a focus lens (moving lens) L2. Three radial protrusions 110a are provided on the outer peripheral surface of the moving ring 110 at equal angular intervals in the circumferential direction. A roller 114 is attached to the tip of the moving ring 110 via an attachment screw 112. Yes. Each of the rollers 114 is fitted in a portion of the cam groove 108b corresponding to each of the straight guide grooves 104a that overlaps in the radial direction (of the first fixed ring 102 and the second fixed ring 104). When 108 rotates, the moving ring 110 (focus lens L2) advances and retreats in the direction of the optical axis O along the straight guide groove 104a.

An AF motor (motor) M is embedded in the rear wall 102b of the first fixed ring 102, and the rotation shaft M1 and a pinion (output gear) P fixed to the rotation shaft M1 are disposed in the arrangement space S. positioned. In the arrangement space S, a one-way input / output rotation transmission mechanism (first one-way input / output rotation transmission mechanism) U1 for linking the pinion P and the input gear 108c of the manual focus ring 108 is arranged. ing.
Next, the structure of the one-way input / output rotation transmission mechanism U1 will be described in detail with reference mainly to FIGS.

  The cylindrical housing 3 whose front end is closed and whose rear end is open has an annular flange 3a at its rear end, and this annular flange 3a is fixed to the first fixed ring 102 by a screw (not shown). ing. A circular plate 3c is fixed to the center of the rear surface of the front wall 3b of the housing 3, and a front end surface of the rotary shaft 5 coaxial with the housing 3 is fixed to the rear surface of the circular plate 3c. The rotary shaft 5 includes a front small diameter portion 5a and a rear large diameter portion 5b. The axial direction of the rotating shaft 5 is parallel to the optical axis O.

  A center hole 7a of a cylindrical input rotation shaft 7 is rotatably fitted to the large diameter portion 5b. As shown in FIG. 2, the diameter of the input rotary shaft 7 increases in three stages as it goes rearward, and the largest diameter portion 7b located at the rearmost position and the intermediate diameter portion 7c located at the middle portion. And the smallest diameter portion (first circumferential unequal width space forming portion) (non-circular cross-sectional portion) 7d positioned forward, and the front surface of the intermediate diameter portion 7c is viewed from the front (when viewed from the axial direction). ) An annular axial orthogonal surface (first axial orthogonal surface) 7c1. The cross-sectional shapes of the maximum diameter portion 7b and the intermediate diameter portion 7c are circular, but as shown in FIG. 3, the cross-sectional shape of the minimum diameter portion 7d is substantially square. An input gear 7e is formed on the outer periphery of the maximum diameter portion 7b.

The input rotary shaft 7 is housed in the housing 3 at a portion positioned in front of the input gear 7e. An annular recess 7f is formed at the center of the rear end surface of the input rotary shaft 7, and a plurality of metal bearing balls (steel balls) 9 are arranged in the annular recess 7f in a circumferential direction. Has been. A circular retaining plate 11 having a diameter substantially the same as that of the annular recess 7f is fixed to the rear end surface of the rotary shaft 5 by a fixing screw 13, and each bearing ball 9 abuts against the retaining plate 11, Further rearward movement of the input rotating shaft 7 is restricted.
Further, the above-described AF motor M is attached to the annular flange 3a of the housing 3, and the pinion P fixed to the rotation shaft M1 of the AF motor M meshes with the input gear 7e of the input rotation shaft 7. is doing.

  Inside the housing 3, a cylindrical cylindrical output rotation shaft 15 having both the front end and the rear end opened is disposed so as to be rotatable about the rotation shaft 5. The cylindrical output rotating shaft 15 has a diameter that increases in two stages as it goes rearward. The rear end portion of the large-diameter cylindrical portion 15a that forms the rear portion of the cylindrical output rotation shaft 15 is fitted between the inner peripheral surface of the housing 3 and the intermediate diameter portion 7c of the input rotation shaft 7 so as to be rotatable. The front end portion of the small-diameter cylindrical portion 15b that forms the front portion of the cylindrical output rotating shaft 15 is fitted to the circular plate 3c so as to be rotatable. An output gear 15c is provided on the entire outer peripheral surface of the small diameter cylindrical portion 15b, and this output gear 15c is exposed to the outside of the housing 3 through a window hole 3d formed in the front end portion of the housing 3. As shown in FIG. 1, the manual focus ring 108 is engaged with the input gear 108c.

  An annular member (first pressing member) 17 located in front of the input rotation shaft 7 is fitted on the large diameter portion 5 b of the rotation shaft 5. A compression coil spring (first urging means) 19 is contracted between the front surface of the annular member 17 and the rear surface of the circular plate 3c, and the annular member 17 is always rearward by the compression coil spring 19. It is energized towards.

  As shown in FIG. 3, between the inner peripheral surface (first rotation transmission cylindrical surface) 15a1 forming the circular shape of the large diameter cylindrical portion 15a and each side surface 7d1 of the minimum diameter portion 7d having a substantially square cross section, A storage space (first circumferential unequal width space) S1 having a different radial width depending on the direction position is formed. That is, the annular space RS formed between the minimum diameter portion 7d and the inner peripheral surface 15a1 of the large diameter cylindrical portion 15a and having an annular shape when viewed from the front is divided into four storage spaces S1.

  Each storage space S1 is provided with a substantially cylindrical differential roller (first differential rotating member) 21 whose central axis (rotating shaft) C1 faces the radial direction of the input rotating shaft 29. Each differential roller 21 is loosely fitted between each side surface 7d1 of the minimum diameter portion 7d and the inner peripheral surface 15a1 of the large diameter cylindrical portion 15a of the cylindrical output rotating shaft 15. On the peripheral surface, a pressing surface (first pressing surface) 17a that forms the rear surface of the annular member 17 and an axially orthogonal surface 7c1 are in contact with each other (sandwiched between the pressing surface 17a and the axially orthogonal surface 7c1). ).

Furthermore, in each storage space S1, a pair of substantially cylindrical food rollers (first rotational force transmission members) 23 whose center axis (rotation axis) C2 faces in a direction parallel to the axis of the rotation axis 5, The differential rollers 21 are stored so as to sandwich the differential rollers 21 when viewed from the front. Each eating roller 23 is movable in the circumferential direction in each storage space S1, and the front and rear lengths of these eating rollers 23 are shorter than the front and rear lengths of the differential rollers 21, and the eating rollers 23 are annular members. Since no urging force is received from 17, it can move relative to the annular member 17 and the input rotation shaft 7 in the direction of the central axis C <b> 2.
Further, although not shown, the lens barrel 100 is provided with an AF switch that enables or disables AF shooting.

Next, the operation of the lens barrel 100 having the above configuration will be described.
First, the operation of the lens barrel 100 when performing focusing by AF will be described.
First, the AF switch is turned on so that AF shooting is possible. When a control circuit (not shown) provided in the camera body sends a forward rotation signal to the AF motor M and the AF motor M rotates forward, the rotational force is input via the pinion P and the input gear 7e. 7 and the input rotary shaft 7 rotates counterclockwise in FIG. Then, each differential roller 21 sandwiched between the pressing surface 17a of the annular member 17 and the axially orthogonal surface 7c1 rotates around the central axis C1 in each storage space S1, and the axis of the input rotary shaft 7 is rotated. Revolves (rotates) in the same direction as the input rotation axis (counterclockwise). At this time, if no slip occurs between each differential roller 21 and the pressing surface 17 a and the axially orthogonal surface 7 c 1, the rotational speed of each differential roller 21 is ½ of the input rotation shaft 7. As a result, each differential roller 21 rotates relative to the input rotation shaft 7 in the clockwise direction. For this reason, each differential roller 21 comes into contact with the biting roller 23 located on the clockwise side, and gives a clockwise rotational force to the biting roller 23. The eating roller 23 to which the rotational force is applied rotates clockwise in each storage space S1, and at the end portion on the clockwise side where the radial width of each storage space S1 is narrow, the minimum diameter portion 7d. It bites with a strong force between each side surface 7d1 and the inner peripheral surface 15a1 of the large-diameter cylindrical portion 15a. As a result, since the minimum diameter portion 7d (input rotation shaft 7) and the cylindrical output rotation shaft 15 are integrated in the circumferential direction via the biting roller 23, the rotational force of the minimum diameter portion 7d is the cylindrical output rotation shaft 15. The cylindrical output rotating shaft 15 rotates counterclockwise. When the cylindrical output rotary shaft 15 rotates, the rotational force of the cylindrical output rotary shaft 15 is transmitted from the output gear 15c to the input gear 108c, and the manual focus ring 108 rotates counterclockwise when viewed from the front. The focus lens L2 moves forward along the optical axis O.

On the other hand, when the control circuit sends a reverse signal to the AF motor M to reverse the AF motor M, the rotational force is transmitted to the input rotary shaft 7 via the pinion P, and the input rotary shaft 7 is transferred to the timepiece of FIG. Rotate in the direction. Each differential roller 21 revolves (rotates) in the same direction as the input rotation shaft 7 at a rotational speed that is 1/2 that of the input rotation shaft 7 while rotating around its central axis C <b> 1. The counter rollers 23 are counterclockwise rotated and biased in the counterclockwise direction. The counter rollers 23 are rotated counterclockwise in the storage spaces S1, and the diameters of the storage spaces S1. At the end portion on the counterclockwise side where the direction width is narrow, a strong force is applied between each side surface 7d1 of the minimum diameter portion 7d and the inner peripheral surface 15a1 of the large diameter cylindrical portion 15a. As a result, the minimum diameter portion 7d (input rotation shaft 7) and the cylindrical output rotation shaft 15 are integrated in the circumferential direction via the biting roller 23, and the cylindrical output rotation shaft 15 rotates in the clockwise direction, and the manual focus ring. 108 rotates clockwise in front view, and the moving ring 110 and the focus lens L2 move rearward along the optical axis O.
Thus, AF is performed by the control circuit rotating the AF motor M in both forward and reverse directions and moving the focus lens L2 back and forth.

Further, when focusing is performed by AF in this way, a signal is sent from the control circuit to the AF motor M, and the AF motor M rotates in the direction opposite to the rotation direction immediately before focusing . Then, the input rotation shaft 7 rotates in the direction opposite to the rotation direction immediately before focusing without rotating the cylindrical output rotation shaft 15, and the minimum diameter portion 7 d of the biting roller 23 and the cylindrical output rotation shaft 15. The biting force against is reduced. Therefore, after this, the manual focus ring 108 of the lens barrel 100 can be smoothly rotated.

Next, the operation of the lens barrel 100 when performing focusing by MF will be described.
If the manual focus ring 108 is rotated clockwise or counterclockwise in front view without driving the AF motor M with the AF switch turned on, the moving ring 110 and the focus lens L2 move forward and backward. , MF is performed.
When the manual focus ring 108 is thus rotated, this rotational force is transmitted from the input gear 108 c to the output gear 15 c of the cylindrical output rotating shaft 15. Then, the cylindrical output rotation shaft 15 rotates clockwise or counterclockwise around the rotation shaft 5, but the inner peripheral surface (first rotation transmission cylindrical surface) 15a1 of the cylindrical output rotation shaft 15 has a circular shape in front view. Therefore, the rotational force is not transmitted from the cylindrical output rotating shaft 15 to the eating roller 23 and the differential roller 21. For this reason, even if the cylindrical output rotating shaft 15 rotates, the minimum diameter portion 7d (input rotating shaft 7) does not rotate, and the rotating shaft M1 of the AF motor M does not rotate.

  As described above, according to the lens barrel 100 of the present embodiment, AF can be performed by turning on the AF switch, and even if the manual focus ring 108 is rotated while the AF switch is on, Since this rotational force is not transmitted to the rotating shaft M1 of the AF motor M, the rotating shaft M1 does not become a rotational resistance for the manual focus ring 108. For this reason, it is possible to smoothly perform the MF operation without switching the AF switch to the OFF side.

  Further, the one-way input / output rotation transmission mechanism U1 revolves (rotates) the differential roller 21 in the same direction while being delayed from the input rotation shaft 7, and the differential roller 21 causes the biting roller 23 to move between the input rotation shaft 7 and the cylinder. Since the bite roller 23 functions as a rotational force transmission member, the torque output from the input rotary shaft 7 to the cylindrical output rotary shaft 15 is reliably performed. As a result, the AF operation can be performed reliably.

  In addition, the biting roller 23 that is the first rotational force transmission member is a cylindrical member having a central axis C2 parallel to the axis of the rotation shaft 5, so that the first rotational force transmission member is a spherical member. The contact area between the input rotary shaft 7 and the cylindrical output rotary shaft 15 is large. For this reason, the one-way input / output rotation transmission mechanism U1 of this embodiment transmits rotational torque from the input rotation shaft 7 to the cylindrical output rotation shaft 15 as compared with the case where the first torque transmission member is spherical. Efficiency is good.

  In addition, by changing the cross-sectional shape of the minimum diameter portion 7d to a regular polygon other than a square, such as a regular triangle or a regular pentagon, or a non-circular shape having at least one surface orthogonal to the radial direction of the input rotation shaft 7. The number of differential rollers 21 and biting rollers 23 arranged in each storage space S1 can be changed. By making such a change, the rotation from the input rotating shaft 7 to the cylindrical output rotating shaft 15 can be performed. The torque transmission efficiency can be adjusted.

Next, a second embodiment of the present invention will be described with reference to FIGS. The same members as those in the first embodiment are designated by the same reference numerals, and detailed description thereof is omitted.
The second fixed ring 202 of the lens barrel 200 of the present embodiment has a rectilinear guide groove 202a similar to the second fixed ring 104 of the first embodiment, and the longitudinal length thereof is longer than that of the second fixed ring 104. The rear end is short and is fixed to the first fixed ring 102 by a fixing screw 106. Between the first fixed ring 102 and the second fixed ring 202, an annular arrangement space S is formed in a front view.
A rear end portion of the lens holding ring 204 that holds the fixed lens L 1 is fixed to the inner peripheral surface of the front end portion of the second fixed ring 202 by a fixing screw 206.

A manual focus ring (manual operation ring) 208 concentric with the first fixed ring 102 rotates around the optical axis O in an annular space formed between the front end portion of the first fixed ring 102 and the lens holding ring 204. It is arranged so as to be freely movable in the direction of the optical axis O. Further, in the arrangement space S, a distance adjusting ring 210 is arranged so as to be rotatable around the optical axis O and not movable in the direction of the optical axis O.
An input gear 210a that meshes with the output gear 15c of the one-way input / output rotation transmission mechanism U1 is formed on the entire inner peripheral surface of the rear end portion of the distance adjusting ring 210. The distance adjusting ring 210 is formed with a cam groove 210b into which the roller 114 is fitted, and the inner peripheral surface (second rotation transmission cylindrical surface) 210c of the front end portion of the distance adjusting ring 210 has a circular shape when viewed from the front. Yes.
A radially inward annular wall 208a protrudes from the inner peripheral surface of the manual focus ring 208. An annular ridge (annular overlapping portion) facing rearward is formed from the entire inner peripheral end of the annular wall 208a. ) 208b is extended.

As shown in FIG. 5, four storage recesses 212 are formed on the outer peripheral surface of the annular ridge 208b at equal angular intervals in the circumferential direction. The storage recess 212 includes a pair of unequal width grooves (second circumferential direction unequal width space forming portions) (second unequal width grooves) 214 and 214 whose depths vary depending on the circumferential position. And a flat portion (second circumferentially unequal width space forming portion) 216 formed between the equal width grooves 214, and the front surface thereof is orthogonal to the optical axis O as shown in FIG. It is an axially orthogonal surface (second axially orthogonal surface) 212a. A storage space (second circumferential unequal width space) SS having a different shape depending on the circumferential position is formed between each unequal width groove 214 and the flat portion 216 and the inner circumferential surface 210c of the distance adjusting ring 210. Is formed.
As shown in FIGS. 5 to 8, a differential roller (with a central axis (rotary axis) CA <b> 1 facing the radial direction of the manual focus ring 208) is formed between the flat portion 216 and the inner peripheral surface 210 c of the distance adjustment ring 210. A second differential rotation member) 218 is provided. As shown in FIG. 6, an annular member (second pressing member) 220 having an annular shape in front view is formed in an annular space formed between the front end surface of the second fixed ring 202 and the annular protrusion 208 b. And an annular leaf spring (second urging means) 222 provided between the annular member 220 and the front end surface of the second fixed ring 202 in a front view. Due to the biasing force of the leaf spring 222, the pressing surface (second pressing surface) 220a of the annular member 220 is always in contact with the rear surface of each differential roller 218 and biases each differential roller 218 forward. The front surface of each differential roller 218 is in contact with the axially orthogonal surface 212a of the storage recess 212.

  Further, in each storage recess 212 (storage space SS), a pair of eating rollers (second rotation) whose center axis (rotation axis) CA2 faces the direction parallel to the optical axis O with the differential roller 218 interposed therebetween. Force transmission member) 224 is disposed. The outer peripheral surface of each eating roller 224 is in contact with each unequal width groove 214 and the inner peripheral surface 210c of the distance adjusting ring 210 so as to be freely rotatable.

As shown in FIG. 4, an annular holding member 226 is rotatable around the optical axis O in a space formed between the lens holding ring 204 and the annular wall 208 a of the manual focus ring 208 and having an annular shape when viewed from the front. It is arranged. The annular holding member 226 is provided with a plurality of holding holes 226a arranged in the circumferential direction, and bearing balls 228 are rotatably held in the holding holes 226a, and each bearing ball 228 is attached to the annular wall 208a. And the lens holding ring 204 are rotatably contacted.
Then, the annular protrusion 208b of the manual focus ring 208, the inner peripheral surface 210c of the distance adjusting ring 210, the housing recess 212 (the axial orthogonal surface 212a, the unequal width groove 214, the flat portion 216), the differential roller 218, the annular member The one-way input / output rotation transmission mechanism (second one-way input / output rotation transmission mechanism) U2 is configured by 220, the leaf spring 222, and the eating roller 224.
Further, although not shown, the lens barrel 200 is provided with an AF switch that enables or disables AF shooting.

Next, the operation of the lens barrel 200 configured as described above will be described.
First, the operation of the lens barrel 200 when performing focusing by AF will be described.

First, the AF switch is turned on so that AF shooting is possible. When a control circuit (not shown) provided in the camera body sends a forward rotation signal to the AF motor M and causes the AF motor M to rotate forward, the rotational force is input via the pinion P and the input gear 7e. As is the case with the first embodiment, the cylindrical output rotating shaft 15 rotates counterclockwise as transmitted to the shaft 7. When the cylindrical output rotating shaft 15 rotates, the rotational force of the cylindrical output rotating shaft 15 is transmitted from the output gear 15c to the input gear 210a, the distance adjusting ring 210 rotates counterclockwise when viewed from the front, and the focus lens L2 is rotated. It moves forward along the optical axis O.
Even if the distance adjusting ring 210 rotates in this way, the inner peripheral surface 210c of the front end portion of the distance adjusting ring 210 is circular in front view, so that the rotational force is applied from the distance adjusting ring 210 to the differential roller 218. As shown in FIG. 7, the biting roller 224 does not move in the circumferential direction. For this reason, the manual focus ring 208 does not rotate.

On the other hand, when a reverse signal is sent from the control circuit to the AF motor M to reverse the AF motor M, the rotational force is transmitted to the input rotary shaft 7 via the pinion P, and as in the first embodiment, The cylindrical output rotating shaft 15 rotates in the clockwise direction. When the cylindrical output rotary shaft 15 rotates, the rotational force of the cylindrical output rotary shaft 15 is transmitted from the output gear 15c to the input gear 210a, the distance adjusting ring 210 rotates clockwise in front view, and the focus lens L2 is turned on by light. Move backward along axis O.
Also in this case, even if the distance adjusting ring 210 rotates, no rotational force is transmitted from the distance adjusting ring 210 to the differential roller 218, and the biting roller 224 does not move in the circumferential direction, so the manual focus ring 208 rotates. do not do.
Thus, AF is performed by the control circuit rotating the AF motor M in both forward and reverse directions and moving the focus lens L2 back and forth.

Further, when focusing is performed by AF as described above, a signal is sent from the control circuit to the AF motor M as in the first embodiment, and the AF motor M is in a direction opposite to the rotation direction immediately before focusing. Rotate. Then, the input rotation shaft 7 rotates in the direction opposite to the rotation direction immediately before focusing without rotating the cylindrical output rotation shaft 15, and the minimum diameter portion 7 d of the biting roller 23 and the cylindrical output rotation shaft 15. The biting force against is reduced.

Next, the operation of the lens barrel 200 when focusing by MF will be described.
When the manual focus ring 208 is rotated counterclockwise in front view without driving the AF motor M with the AF switch held in the ON state, the pressing surface 220a of the annular member 220 and the axial orthogonal surface 212a Each of the differential rollers 218 sandwiched by the shaft revolves (rotates) in the same direction (counterclockwise) as the manual focus ring 208 around the optical axis O while rotating around the central axis CA1 in each housing recess 212. At this time, if no slip occurs between each differential roller 218 and the pressing surface 220a and the axially orthogonal surface 212a, the rotational speed of each differential roller 218 is ½ of the manual focus ring 208. As a result, as shown in FIG. 8, each differential roller 218 rotates relative to the manual focus ring 208 in the clockwise direction in front view. For this reason, each differential roller 218 comes into contact with the biting roller 224 positioned in the clockwise direction when viewed from the front, and applies a clockwise rotational force to the biting roller 224. The eating roller 224 to which the rotational force is applied rotates clockwise in each storage space SS, and the unequal width groove 214 is formed at the end portion on the clockwise side where the radial width of each storage space SS is narrow. And the inner peripheral surface 210c of the distance adjusting ring 210 are bitten with a strong force. As a result, the manual focus ring 208 and the distance adjustment ring 210 are integrated in the circumferential direction via the eating roller 224, so that the rotational force of the manual focus ring 208 is transmitted to the distance adjustment ring 210, and the distance adjustment ring 210 is counterclockwise. Rotate in the direction. When the distance adjustment ring 210 rotates counterclockwise, the focus lens L2 moves forward along the optical axis O.

  When the distance adjusting ring 210 rotates in this way, this rotational force is transmitted to the output gear 15c of the one-way input / output rotation transmission mechanism U1 via the input gear 210a. However, as in the first embodiment, the one-way Since the input / output rotation transmission mechanism U1 does not transmit this rotational force to the AF motor M, the rotation shaft M1 of the AF motor M does not rotate.

  On the other hand, when the manual focus ring 208 is rotated clockwise in a front view, each differential roller 218 held between the pressing surface 220a of the annular member 220 and the axially orthogonal surface 212a is centered in each storage recess 212. While rotating around the axis CA1, it revolves (rotates) around the optical axis O in the same direction (clockwise) as the manual focus ring 208. At this time, if no slip occurs between each differential roller 218 and the pressing surface 220a and the axially orthogonal surface 212a, the rotational speed of each differential roller 218 is ½ of the manual focus ring 208. As a result, each differential roller 218 rotates relative to the manual focus ring 208 counterclockwise in front view. For this reason, each differential roller 218 comes into contact with the biting roller 224 located on the counterclockwise side when viewed from the front, and applies a counterclockwise rotational force to the biting roller 224. The eating roller 224 given the rotational force rotates counterclockwise in each storage space SS, and has an unequal width at the counterclockwise end where the radial width of each storage space SS is narrow. It bites in with a strong force between the groove 214 and the inner peripheral surface 210c of the distance adjusting ring 210. As a result, the manual focus ring 208 and the distance adjustment ring 210 are integrated in the circumferential direction via the eating roller 224, and the distance adjustment ring 210 rotates in the clockwise direction. When the distance adjusting ring 210 rotates in the clockwise direction, the focus lens L2 moves rearward along the optical axis O.

  When the distance adjusting ring 210 rotates in this way, this rotational force is transmitted to the output gear 15c of the one-way input / output rotation transmission mechanism U1 via the input gear 210a. In this case as well, the one-way input / output rotation transmission mechanism U1. Does not transmit this rotational force to the AF motor M, and the rotating shaft M1 does not rotate.

  According to the lens barrel 200 of the present embodiment described above, not only the same effects as in the first embodiment are obtained, but also the manual focus ring 208 does not rotate during the AF operation, so that the photographer's hand can be manually operated. An effect that the AF operation can be performed smoothly even when the focus ring 208 is touched is not obtained in the first embodiment.

  Furthermore, the one-way input / output rotation transmission mechanism U1 used in the lens barrels 100 and 200 of the first and second embodiments described above can be configured as follows.

FIG. 9 shows a first modification in which the internal / external relationship between the input rotation shaft and the output rotation shaft is reversed from that of the one-way input / output rotation transmission mechanism U1 (the same member as the one-way input / output rotation transmission mechanism U1). Are given the same reference).
This one-way input / output rotation transmission mechanism U1a has a cylindrical output rotation shaft 25 rotatably fitted on the large-diameter portion 5b of the rotation shaft 5, and a cylindrical tubular input rotation shaft 27 is rotated on the outside thereof. It is arranged as possible. On the inner peripheral surface of the cylindrical input rotary shaft 27, four unequal width grooves (first circumferential width unequal space forming portion) (first unequal width) having different radial depths depending on the circumferential position. Grooves) 27a are formed side by side at equal angular intervals in the circumferential direction. A storage space (first circumferential unequal width) having a different radial width depending on a circumferential position between each unequal width groove 27a and the outer circumferential surface (first rotation transmission cylindrical surface) 25a of the output rotary shaft 25. Space S2 is formed, and the annular space RS between the output rotation shaft 25 and the cylindrical input rotation shaft 27 is partitioned into four storage spaces S2.

The cylindrical input rotating shaft 27 includes an axially orthogonal surface (first axially orthogonal surface) 27b orthogonal to the axis of the rotating shaft 5, and a unidirectional input / output rotation transmission is provided in front of each storage space S2. Similar to the mechanism U1, an annular member 17 (not shown in FIG. 9) urged rearward by the compression coil spring 19 is disposed. As shown in the figure, a differential roller 21 is disposed in each storage space S2, and this differential roller 21 is always held between the pressing surface 17a of the annular member 17 and the axially orthogonal surface 27b. . Furthermore, in each storage space S2, a pair of eating rollers 23 are arranged so as to be movable in the circumferential direction in each storage space S2 with the differential roller 21 interposed therebetween.
Although not shown, the cylindrical input rotation shaft 27 is provided with an input gear, and this input gear meshes with the pinion P of the AF motor M. Further, the output rotation shaft 25 is provided with an output gear, and this output gear meshes with the input gears 108 c and 210 a of the manual focus ring 108 or the distance adjustment ring 210.

  When the AF switch is turned on and the AF motor M is rotated forward or backward, the cylindrical input rotary shaft 27 rotates clockwise or counterclockwise in FIG. 9, and each differential roller 21 is placed in each storage space S2. Is rotated around the central axis C1 and revolved (rotated) around the axis of the cylindrical input rotary shaft 27 in the same direction as the cylindrical input rotary shaft 27 at a rotational speed half that of the cylindrical input rotary shaft 27. Then, the biting roller 23 positioned in the direction opposite to the rotation direction of the cylindrical input rotating shaft 27 is pressed clockwise or counterclockwise. The pressed bite roller 23 moves in each storage space S <b> 2 to the end portion where the radial width is narrow, and the unequal width groove 27 a of the cylindrical input rotation shaft 27 and the outer peripheral surface 25 a of the output rotation shaft 25. I bite with a strong force in between. As a result, the rotational force of the cylindrical input rotary shaft 27 is transmitted to the output rotary shaft 25 via each biting roller 23, the output rotary shaft 25 rotates in the same direction as the cylindrical input rotary shaft 27, and the AF operation is performed. Executed.

Even in this modified example, when focusing is performed by AF, a signal is sent from the control circuit to the AF motor M, and the AF motor M rotates in a direction opposite to the rotation direction immediately before focusing , and the cylindrical input rotating shaft 27 is rotated. However, without rotating the output rotating shaft 25, it rotates in the direction opposite to the rotation direction immediately before focusing, and the biting force of the biting roller 23 on the cylindrical input rotating shaft 27 and the output rotating shaft 25 is reduced. As a result, the manual focus ring 108 of the lens barrel 100 or the manual focus ring 208 of the lens barrel 200 can be smoothly rotated.

In the state of FIG. 9, when the manual focus ring 108 of the lens barrel 100 or the manual focus ring 208 of the lens barrel 200 is rotated, the output rotation shaft 25 rotates clockwise or counterclockwise, and MF is performed. Since the outer peripheral surface 25a of the output rotary shaft 25 is circular when viewed from the front, the rotational force of the output rotary shaft 25 is not transmitted to the eating roller 23. Therefore, the cylindrical input rotating shaft 27 does not rotate, and the rotating shaft M1 of the AF motor M does not rotate.
Even if such a one-way input / output rotation transmission mechanism U1a is employed, the same effect as that obtained when the one-way input / output rotation transmission mechanism U1 is employed can be obtained.

10 to 12 show a second modification of the one-way input / output rotation transmission mechanism U1.
The input rotation shaft 32 of the one-way input / output rotation transmission mechanism U1b includes a small-diameter portion 32a that forms the front portion thereof, and a large-diameter portion 32b that forms the rear portion thereof. An annular recess 32c is formed. Further, an annular fitting recess 32d is formed on the front surface of the large-diameter portion 32b which is annular.
The cross-sectional shape of the large-diameter portion 32b is circular, and as shown in FIG. 12, the circumferential surface of the small-diameter portion 32a is parallel to the axis of the rotating shaft 5 and has six unequal depths that vary in depth depending on the circumferential position. Width grooves (first circumferentially unequal width space forming portions) (first unequal width grooves) 32e are formed at equal angular intervals in the circumferential direction. And between each non-uniform width groove | channel 32e and the internal peripheral surface (1st rotation transmission cylindrical surface) 15a1 of the large diameter cylindrical part 15a, the storage space (1st rotation width) from which the radial direction width changes with circumferential positions. A circumferential unequal width space) S3 is formed. An input gear 32f that meshes with the pinion P is provided on the outer peripheral surface of the large diameter portion 32b.

Inside the cylindrical output rotating shaft 15, a cylindrical retainer 34 having a rear end opened and having an insertion hole 34b through which the rotating shaft 5 passes is provided at the center of the front wall 34a. Yes. As shown in FIG. 11, in the front wall 34a of the retainer 34, three fitting holes 34c are bored side by side at equal angular intervals in the circumferential direction, and each fitting hole 34c has a central axis thereof. A substantially cylindrical differential roller (first differential rotating member) 36 (rotating shaft) C3 facing the radial direction of the cylindrical output rotating shaft 15 is fitted so as to be rotatable around the central axis C3. The front end of the differential roller 36 protrudes forward of the front wall 34a, and the rear end portion protrudes rearward of the front wall 34a. As shown in FIG. 10, the front portion of the circumferential surface of the differential roller 36 is in contact with the pressing surface 17 a of the annular member 17, and the rear portion of the circumferential surface is formed on the front surface of the small diameter portion 32 a of the input rotation shaft 32. Further, the differential roller 36 is always held between the annular member 17 and the axial orthogonal surface 32a1 because it is in contact with the axial orthogonal surface (first axial orthogonal surface) 32a1 orthogonal to the optical axis O. .
As shown in FIG. 12, the cylindrical portion 34d of the retainer 34 is located in an annular space RS formed between the small diameter portion 32a and the large diameter cylindrical portion 15a. The cylindrical portion 34d is formed with six mounting holes 34e arranged at equal angular intervals in the circumferential direction, and the central axis (rotating shaft) C4 of each mounting hole 34e is the axis of the rotating shaft 5. Are fitted so as to be rotatable about the central axis C4 and movable in the direction of the central axis C4.

  When the AF switch is turned on, a forward rotation signal is sent from the control circuit provided in the camera body to the AF motor M, and the AF motor M is rotated forward, the rotational force is transmitted via the pinion P and the input gear 32f. Is transmitted to the input rotary shaft 32, and the input rotary shaft 32 rotates counterclockwise in FIG. Then, each differential roller 36 sandwiched between the pressing surface 17a of the annular member 17 and the axially orthogonal surface 32a1 rotates around the central axis C3, and at a rotational speed that is 1/2 of the input rotational shaft 32, It revolves (rotates) around the axis of the input rotation shaft 32 in the same direction as the input rotation shaft 32. As a result, the retainer 34 and the biting rollers 38 that rotate together with the differential roller 36 around the rotation shaft 5 rotate relative to the input rotation shaft 32 in the clockwise direction. Then, the bite roller 38 has an end portion on the clockwise side of the unequal width portion 32e and an inner portion of the large-diameter cylindrical portion 15a at the end portion on the clockwise side where the radial width of each storage space S3 is narrow. It bites in with strong force between the peripheral surface 15a1. As a result, the small diameter portion 32a (input rotation shaft 32) and the cylindrical output rotation shaft 15 are integrated in the circumferential direction via the biting roller 38, the retainer 34, and the differential roller 36, so that the rotation of the small diameter portion 32a. The force is transmitted to the cylindrical output rotating shaft 15, and the cylindrical output rotating shaft 15 rotates counterclockwise. Then, the output gear 15 c formed on the cylindrical output rotating shaft 15 rotates, and this rotational force causes the input gear 108 c of the manual focus ring 108 of the lens barrel 100 or the input gear of the distance adjusting ring 210 of the lens barrel 200. The focus lens L2 moves forward along the optical axis O.

On the other hand, when a reverse signal is sent from the control circuit to the AF motor M to reverse the AF motor M, the rotational force is transmitted to the input rotary shaft 32 via the pinion P and the input gear 32f, and the input rotary shaft 32 is It rotates clockwise in FIG. Then, each differential roller 36 revolves (rotates) in the clockwise direction at a rotational speed that is 1/2 of the input rotation shaft 32, and the retainer 34 and each biting roller 38 counterclockwise with respect to the input rotation shaft 32. Rotate relative to As a result, each eating roller 38 rotates counterclockwise in each storage space S3, and the non-equal width groove 32e is formed at the counterclockwise end where the radial width of each storage space S3 is narrow. Between the end portion on the counterclockwise direction and the inner peripheral surface 15a1 of the large-diameter cylindrical portion 15a with a strong force. Then, the small-diameter portion 32a (input rotation shaft 32) and the cylindrical output rotation shaft 15 are integrated in the circumferential direction via the biting roller 38, the retainer 34, and the differential roller 36, and the cylindrical output rotation shaft 15 is clockwise. The focus lens L2 moves backward along the optical axis O.
Thus, AF is performed by the control circuit rotating the AF motor M in both forward and reverse directions.

Further, even in the lens barrels 100 and 200 to which this modification is applied, when focusing is performed by AF, a signal is sent from the control circuit to the AF motor M, and the AF motor M is in a direction opposite to the rotation direction immediately before focusing. Rotate to. Then, the input rotation shaft 32 rotates in the direction opposite to the rotation direction immediately before focusing without rotating the cylindrical output rotation shaft 15, and the cylindrical output rotation shaft 15 and the input rotation shaft 32 of the biting roller 38. Therefore, the manual focus ring 108 or the manual focus ring 208 can be smoothly rotated thereafter.

  In the state of FIG. 12, when the manual focus ring 108 of the lens barrel 100 or the manual focus ring 208 of the lens barrel 200 is rotated, the cylindrical output rotating shaft 15 rotates clockwise or counterclockwise. Since the inner peripheral surface 15a1 of the large-diameter cylindrical portion 15a of the output rotating shaft 15 is circular when viewed from the front, the rotational force of the cylindrical output rotating shaft 15 is not transmitted to the biting roller 38, and the input rotating shaft 32 does not rotate. For this reason, the rotation shaft M1 of the AF motor M does not rotate.

Even if such a one-way input / output rotation transmission mechanism U1b is employed, the same effect as that obtained when the one-way input / output rotation transmission mechanism U1 is employed can be obtained.
Furthermore, by using the retainer 34, the annular space RS formed between the small-diameter portion 32a of the input rotation shaft 32 and the cylindrical output rotation shaft 15 can be effectively used in terms of space. As a result, it is possible to increase the number of biting rollers 38. If the number of biting rollers 38 is increased, it is possible to improve the transmission efficiency of rotational torque from the input rotary shaft 32 to the cylindrical output rotary shaft 15. It becomes.

FIG. 13 shows a third modification of the one-way input / output rotation transmission mechanism U1 in which the internal / external relationship between the input rotation shaft and the output rotation shaft is reversed from that of the second modification (one-way input / output rotation). The same members as those of the transmission mechanism U1b are denoted by the same reference numerals).
In this one-way input / output rotation transmission mechanism U1c, a cylindrical output rotary shaft 40 is rotatably fitted on the large-diameter portion 5b of the rotary shaft 5, and a cylindrical input rotary shaft 42 is rotatably arranged on the outside thereof. It has been made. On the inner peripheral surface of the cylindrical input rotation shaft 42, six unequal width grooves (first circumferential width unequal space forming portions) (first unequal width) having different radial depths depending on the circumferential position. Grooves) 42a are formed side by side at equal angular intervals in the circumferential direction. Between each unequal width groove 42a and the outer peripheral surface (first rotation transmission cylindrical surface) 40a of the output rotating shaft 40, a storage space (first circumferential unequal width) having a different radial width depending on a circumferential position. Space) S4 is formed.

Similar to the one-way input / output rotation transmission mechanism U1b, in front of the annular space RS (housing space S4) formed between the cylindrical input rotation shaft 42 and the output rotation shaft 40, the compression coil spring 19 is used to move backward. A biased annular member 17 (none of which is shown in FIG. 13) is disposed, and a cylindrical portion 34d of the retainer 34 is rotatably disposed in the annular space RS. Although not shown in FIG. 13, a differential roller 36 is fitted in a fitting hole 34c provided in the front wall 34a of the retainer 34 so as to be rotatable about the central axis C3. Each differential roller 36 is axially orthogonal to the pressing surface 17a of the annular member 17 and the axial line of the cylindrical input rotary shaft 42 formed on the cylindrical input rotary shaft 42 by the urging force of the compression coil spring 19. It is always held between a surface (first axially orthogonal surface) (not shown in FIG. 13). Furthermore, six mounting holes 34e are formed in the cylindrical portion 34d of the retainer 34 so as to be arranged in the circumferential direction, and the central axis C4 of each mounting hole 34e is parallel to the axis of the rotary shaft 5. 38 is supported so as to be rotatable around the central axis C4 and movable in the direction of the central axis C4, and each eating roller 38 is located in each storage space S4.
Although not shown, the cylindrical input rotary shaft 42 is provided with an input gear, and this input gear meshes with the pinion P of the AF motor M. Further, the output rotation shaft 40 is provided with an output gear, and this output gear meshes with the input gear 108 c of the manual focus ring 108 or the input gear 210 a of the distance adjustment ring 210.

  When the AF motor M is rotated forward or backward after the AF switch is turned on, the cylindrical input rotation shaft 42 rotates in the clockwise direction or the counterclockwise direction of FIG. 13, and each differential roller 36, the retainer 34, The biting roller 38 revolves (rotates) in the same direction as the cylindrical input rotary shaft 42 at a half speed of the cylindrical input rotary shaft 42. Then, each eating roller 38 relatively rotates in the opposite direction with respect to the cylindrical input rotation shaft 42 in each storage space S4 and moves to the end side where the radial width of each storage space S4 is narrow. In addition, it bites in between the unequal width groove 42a of the cylindrical input rotating shaft 42 and the outer peripheral surface 40a of the output rotating shaft 40 with a strong force. As a result, the rotational force of the cylindrical input rotating shaft 42 is transmitted to the output rotating shaft 40 via each biting roller 38, and the output rotating shaft 40 rotates in the same direction as the cylindrical input rotating shaft 42 and is focused.

Even in this modified example, when focusing is performed by AF, a signal is sent from the control circuit to the AF motor M. The AF motor M rotates in the direction opposite to the rotation direction immediately before focusing , and the cylindrical input rotating shaft 42 is rotated. However, without rotating the output rotating shaft 40, it rotates in the direction opposite to the rotation direction immediately before focusing, and the biting force on the output rotating shaft 40 and the cylindrical input rotating shaft 42 of the biting roller 38 is reduced. As a result, thereafter, the manual focus ring 108 of the lens barrel 100 or the manual focus ring 208 of the lens barrel 200 can be smoothly rotated.

In the state of FIG. 13, when the manual focus ring 108 of the lens barrel 100 or the manual focus ring 208 of the lens barrel 200 is rotated, the output rotation shaft 40 rotates clockwise or counterclockwise. Since the outer peripheral surface 40a is circular when viewed from the front, the rotational force of the output rotary shaft 40 is not transmitted to the biting roller 38, and the cylindrical input rotary shaft 42 does not rotate.
Also by such a modification, the same effect as the second modification can be obtained.

In the first and second embodiments and modifications thereof, rotational torque from the input rotary shafts 7 and 32 and the cylindrical input rotary shafts 27 and 42 to the cylindrical output rotary shaft 15 and the output rotary shafts 25 and 40 is reduced. If the transmission efficiency is ignored, the differential rollers 21 and 36 and the eating rollers 23 and 38 can be replaced with simple spherical members.
Further, instead of the differential rollers 21 and 36, it is possible to use a differential roller 50 as shown in FIG. The differential roller 50 has a central axis (rotary axis) C5 that faces the radial direction of the input rotary shafts 7 and 32 or the cylindrical input rotary shafts 27 and 42, and has a cross-sectional shape perpendicular to the central axis C5. The shape shown in FIG. 14 is obtained at any position on the central axis C5. In this case, the input rotation shafts 7 and 32, the cylindrical input rotation shaft 27, and the like so long as the pair of arc portions 50a and 50b maintain a contact relationship with the pressing surface 17a of the annular member 17 and the axially orthogonal surfaces 7c1 and 32a1. 42, and within this rotation range, the eating rollers 23 and 38 are moved between the input rotary shafts 7 and 32 and the cylindrical output rotary shaft 15, or the cylindrical input rotary shafts 27 and 42 and the output rotary shaft 25, Invite between 40.
Furthermore, if the reduction in rotational torque transmission efficiency is ignored, the differential rollers 21, 36, 50 and the eating rollers 23, 38 are arranged only in one storage space S 1, S 2, S 3, S 4. Is also possible.

  Further, the wedge angle of the wedge-shaped space formed by the inner peripheral surface 15a1 of the large-diameter cylindrical portion 15a and the end portions of the side surfaces 7d1 or the unequal width grooves 32e, the outer peripheral surfaces 25a of the output rotary shafts 25 and 40, 40a and the wedge angle of the wedge-shaped space formed by the unequal width grooves 27a and 42a of the cylindrical input rotary shafts 27 and 42, the strength of the compression coil spring 19, the axial orthogonal surfaces 7c1, 27b, 32a1 and the annular member Rotational torque transmission efficiency from the input rotary shafts 7 and 32 and the cylindrical input rotary shafts 27 and 42 to the cylindrical output rotary shaft 15 and the output rotary shafts 25 and 40 by changing the surface roughness of the 17 pressing surfaces 17a. Can be changed.

  Furthermore, the one-way input / output rotation transmission mechanism U2 of the second embodiment is arranged such that the annular protrusion 208b of the manual focus ring 208 is positioned on the outer peripheral side of the front end portion of the distance adjustment ring 210, and the inner peripheral surface of the annular protrusion 208b And the outer peripheral surface of the front end portion of the distance adjusting ring 210 is a second rotation transmission cylindrical surface having a circular shape when viewed from the front, and the unequal width groove 214 and the flat portion 216 formed in the storage recess 212 are formed. And a second rotation transmission cylindrical surface, a second circumferential unequal width space is formed, and the differential roller 218 and the eating roller 224 are disposed between the storage recess and the second rotation transmission cylindrical surface. May be configured.

In the first and second embodiments and the modifications thereof, the one-way input / output rotation transmission mechanisms U1, U1a, U1b, U1c are applied to the focus lens barrel, but may be applied to a zoom lens barrel. Good. That is, the power zoom is performed by the distance adjusting ring for moving the lens barrel 100, 200 in the optical axis direction of the moving ring holding the zoom lens, and the zoom ring (manual operation ring) when the power zoom switch is OFF. When the switch is ON, it is configured to be rotated by a zoom motor (motor) that is driven in conjunction with the rotation of the zoom ring, and one-way input / output rotation is transmitted between the zoom motor and the distance adjustment ring. Mechanisms U1, U1a, U1b, U1c are provided.
If the lens barrels 100 and 200 are configured as described above, if the zoom ring is rotated after turning on the power zoom switch, the distance adjusting ring is rotated by the driving force of the zoom motor to perform zooming. . On the other hand, if the power zoom switch is turned off and the zoom ring is rotated, manual zooming is performed. At this time, the distance that the one-way input / output rotation transmission mechanism U1, U1a, U1b, U1c is rotated by the zoom ring. Since the rotating force of the adjusting ring is not transmitted to the zoom motor, the manual zoom operation can be performed smoothly without receiving resistance from the zoom motor.

It is a vertical side view of the upper half part of the lens barrel of the first embodiment of the present invention. It is a vertical side view of the 1st one way input / output rotation transmission mechanism. FIG. 3 is a longitudinal front view taken along line III-III in FIG. 2. It is a vertical side view of the upper half part of the lens barrel of the second embodiment of the present invention. FIG. 5 is an enlarged longitudinal sectional front view taken along line V-V in FIG. 4, omitting a lens holding ring, a moving ring, and a focus lens. It is the enlarged view which looked at the 2nd one-way input / output rotation transmission mechanism from the outer peripheral side of the annular ridge. It is an enlarged vertical front view of a second one-way input / output rotation transmission mechanism. It is an enlarged vertical front view of the second one-way input / output rotation transmission mechanism when the manual focus ring is rotated. It is an expansion longitudinal section front view of the 1st modification of the 1st one way input / output rotation transmission mechanism. It is a vertical side view of the 2nd modification of the 1st one way input / output rotation transmission mechanism. It is a vertical front view which follows the XI-XI line of FIG. It is a vertical front view which follows the XII-XII line | wire of FIG. It is a vertical front view of the 3rd modification of the 1st one way input / output rotation transmission mechanism. It is sectional drawing orthogonal to the center axis | shaft of the modification of a differential roller.

Explanation of symbols

3 housing 3a annular flange 3b front wall 3c circular plate 3d window hole 5 rotation shaft 5a small diameter portion 5b large diameter portion 7 input rotation shaft 7a center hole 7b maximum diameter portion 7c intermediate diameter portion 7c1 axially orthogonal surface 7d minimum diameter portion (first 1 circumferentially unequal width space forming part) (cross-sectional non-circular part)
7d1 Side surface 7e Input gear 7f Annular recess 9 Bearing ball 11 Retaining plate 13 Fixing screw 15 Cylindrical output rotating shaft 15a Large diameter cylindrical portion 15a1 Inner peripheral surface (first rotational transmission cylindrical surface)
15b Small diameter cylindrical portion 15c Output gear 17 Annular member (first pressing member)
17a Press surface (first press surface)
19 Compression coil spring (first biasing means)
21 Differential roller (first differential rotating member)
23 Eating roller (first rotational force transmission member)
25 Output rotating shaft 25a Outer peripheral surface (first rotation transmission cylindrical surface)
27 Cylindrical input rotation shaft 27a Unequal width groove (first circumferential width uneven space forming portion) (first uneven width groove)
27b Axial orthogonal plane (first axial orthogonal plane)
32 Input rotation shaft 32a Small diameter portion 32a1 Axial direction orthogonal surface (first axial direction orthogonal surface)
32b Large diameter portion 32c Annular recess 32d Fitting recess 32e Unequal width groove (first circumferential width unequal space forming portion) (first unequal width groove)
32f Input gear 34 Retainer 34a Front wall 34b Insertion hole 34c Fitting hole 34d Cylindrical portion 34e Mounting hole 36 Differential roller (first differential rotation member)
38 Eating roller (first rotational force transmission member)
40 Output rotating shaft 40a Outer peripheral surface (first rotation transmission cylindrical surface)
42 cylindrical input rotation shaft 42a unequal width groove (first circumferential width unequal space forming portion) (first unequal width groove)
50 Differential roller (first differential rotating member)
50a 50b Arc portion 100 Lens barrel 102 First fixed ring 102a Bayonet portion 104 Second fixed ring 104a Straight guide groove 104b Front end portion 106 Fixing screw 108 Manual focus ring (manual operation ring)
108a Rotating operation portion 108b Cam groove 108c Input gear 110 Moving ring 110a Radial protrusion 112 Mounting screw 114 Roller 200 Lens barrel 202 Second fixed ring 202a Straight guide groove 204 Lens holding ring 206 Fixed screw 208 Manual focus ring (manual operation) ring)
208a Annular wall 208b Annular ridge (annular overlapping portion) (second one-way input / output rotation transmission mechanism)
210 Distance adjustment ring 210a Input gear 210b Cam groove 210c Inner peripheral surface (second rotation transmission cylindrical surface) (second one-way input / output rotation transmission mechanism)
212 Storage recess (second one-way input / output rotation transmission mechanism)
212a Axial orthogonal plane (second axial orthogonal plane) (second one-way input / output rotation transmission mechanism)
214 Non-uniform width groove (second circumferential direction non-uniform width space forming portion) (second non-uniform width groove) (second one-way input / output rotation transmission mechanism)
216 flat part (second circumferentially unequal width space forming part)
218 Differential roller (second differential rotation member) (second one-way input / output rotation transmission mechanism)
220 annular member (second pressing member) (second one-way input / output rotation transmission mechanism)
220a pressing surface (second pressing surface)
222 Leaf spring (second biasing means) (second one-way input / output rotation transmission mechanism)
224 Eating roller (second rotational force transmission member) (second one-way input / output rotation transmission mechanism)
226 annular holding member 228 bearing ball C1 C2 C3 C4 C5 CA1 CA2 central axis L1 fixed lens L2 focus lens (moving lens)
M AF motor (motor)
M1 Rotating shaft P Pinion (Output gear)
RS annular space S installation space S1, S2, S3, S4 storage space (first circumferentially unequal width space)
SS storage space (second circumferential non-uniform width space)
U1 U1a U1b U1c One-way input / output rotation transmission mechanism (first one-way input / output rotation transmission mechanism)
U2 one-way input / output rotation transmission mechanism (second one-way input / output rotation transmission mechanism)

Claims (20)

A manual operation ring that moves the moving lens in the optical axis direction by manual rotation operation;
A motor for driving the moving lens in the optical axis direction;
A first one-way input / output rotation transmission mechanism that transmits the driving force to the moving lens when the motor is driven and does not transmit the moving force of the moving lens to the motor when the manual operation ring is rotated. When,
In a lens barrel comprising:
The first one-way input / output rotation transmission mechanism is
An input rotary shaft having a first axially orthogonal plane orthogonal to an axis parallel to the optical axis and driven to rotate by the motor;
A cylindrical output rotation shaft in which the input rotation shaft is inserted so as to be relatively rotatable and linked to the manual operation ring, and the rotational movement and movement of the moving lens in the optical axis direction are linked,
A first circumference that forms a first circumferentially unequal width space having an unequal width in the circumferential direction between the input rotation shaft and a first rotation transmission cylindrical surface inside the cylindrical output rotation shaft. Direction unequal width space forming part,
Inserted in the first circumferentially unequal width space and always brought into contact with the first axially orthogonal plane by the first biasing means, and in conjunction with the rotation of the input rotary shaft, the input A plurality of first differential rotating members that revolve in the same direction while being delayed from the input rotating shaft about the axis of the rotating shaft;
A first rotational force that is movably inserted into the first circumferentially unequal width space and revolves in the same direction as the first differential rotating member by being pushed by the first differential rotating member. A transmission member;
An input gear provided on the input rotating shaft and meshing with an output gear of the motor;
In the first circumferential unequal width space forming portion, the first rotational force transmitting member rotated in the circumferential direction is configured such that the first rotational transmission of the outer peripheral surface of the input rotary shaft and the cylindrical output rotary shaft is performed. A shape that bites between the cylindrical surfaces and transmits the rotational force of the input rotary shaft to the cylindrical output rotary shaft,
During rotation stop of the tubular output rotary shaft, the motor, the rotation direction in the immediately preceding time the rotation stop by rotating in the reverse direction, without rotating the cylindrical rotary output shaft, the input rotary shaft However, the lens barrel rotates in a direction opposite to the rotation direction immediately before the rotation stop. A manual operation ring that moves the moving lens in the optical axis direction by manual rotation operation;
A motor for driving the moving lens in the optical axis direction;
A first one-way input / output rotation transmission mechanism that transmits the driving force to the moving lens when the motor is driven and does not transmit the moving force of the moving lens to the motor when the manual operation ring is rotated. When,
In a lens barrel comprising:
The first one-way input / output rotation transmission mechanism is
A cylindrical input rotary shaft having a first axially orthogonal plane orthogonal to an axis parallel to the optical axis, and driven to rotate by the motor;
The cylindrical input rotary shaft is inserted in a relatively rotatable manner and is linked to the manual operation ring. The outer peripheral surface of the cylindrical input rotary shaft forms a first rotation transmission cylindrical surface, and the rotational motion and the optical axis direction of the moving lens. An output rotation axis that is linked to movement,
A first circumferentially unequal width space having an unequal width in the circumferential direction is formed between the output rotation shaft and the first rotation transmission cylindrical surface formed on the inner circumferential surface of the cylindrical input rotation shaft. A first circumferentially unequal width space forming part;
Inserted into the first circumferentially unequal width space, and always brought into contact with the first axially orthogonal plane by the first biasing means, in conjunction with the rotation of the cylindrical input rotary shaft, A plurality of first differential rotating members that revolve in the same direction while being delayed from the cylindrical input rotating shaft about the axis of the cylindrical input rotating shaft;
A first rotational force that is movably inserted into the first circumferentially unequal width space and revolves in the same direction as the first differential rotating member by being pushed by the first differential rotating member. A transmission member;
An input gear provided on the cylindrical input rotating shaft and meshing with an output gear of the motor;
In the first circumferential unequal width space forming portion, the first rotational force transmitting member rotated in the circumferential direction is configured such that the first rotational transmission of the inner peripheral surface of the cylindrical input rotary shaft and the output rotary shaft is performed. A shape that bites between the cylindrical surfaces and transmits the rotational force of the cylindrical input rotary shaft to the output rotary shaft,
During rotation stop of the output rotary shaft, the motor, the rotation direction in the immediately preceding time the rotation stop by rotating in the reverse direction, without rotating the output rotary shaft, the cylindrical rotary input shaft is, A lens barrel that rotates in a direction opposite to the rotation direction immediately before the rotation is stopped. The lens barrel according to claim 1 or 2,
A lens barrel in which a pair of the first rotational force transmission members are inserted side by side in the circumferential direction so as to sandwich the first differential rotation member in the first circumferential unequal width space. In the lens barrel according to any one of claims 1 to 3,
The first circumferential unequal width space forming portion forms the first circumferential unequal width space between the cylindrical output rotation shaft or the first rotation transmission cylindrical surface of the output rotation shaft. To form multiple,
A lens barrel in which the first differential rotating member and the first rotational force transmitting member are inserted into each first circumferentially unequal width space. In the lens barrel according to any one of claims 1 to 4,
The lens barrel in which the first circumferentially unequal width space forming portion is a cross-sectional non-circular portion having at least one surface perpendicular to the radial direction of the input rotation shaft or the cylindrical input rotation shaft. A manual operation ring that moves the moving lens in the optical axis direction by manual rotation operation;
A motor for driving the moving lens in the optical axis direction;
A first one-way input / output rotation transmission mechanism that transmits the driving force to the moving lens when the motor is driven and does not transmit the moving force of the moving lens to the motor when the manual operation ring is rotated. When,
In a lens barrel comprising:
The first one-way input / output rotation transmission mechanism is
An input rotary shaft having a first axially orthogonal plane orthogonal to an axis parallel to the optical axis and driven to rotate by the motor;
The input rotation shaft is inserted in a relatively rotatable manner and linked with the manual operation ring. The rotational movement and the movement of the moving lens in the optical axis direction are interlocked, and the inner peripheral surface thereof is the input rotation shaft. A cylindrical output rotating shaft forming a first rotation transmitting cylindrical surface that forms an annular space with the outer peripheral surface of
A first circumferentially unequal width space having a nonuniform width in the circumferential direction forming a part of the annular space is formed between the first rotation transmission cylindrical surface formed on the input rotation shaft. A circumferentially unequal width space forming part,
The first urging means is always brought into contact with the first axially orthogonal plane and is delayed with respect to the input rotation shaft around the axis of the input rotation shaft in conjunction with the rotation of the input rotation shaft. A plurality of first differential rotating members revolving in the same direction;
A retainer that revolves in the same direction as the first differential rotation member by being inserted into the annular space and being pressed by the first differential rotation member;
A first rotational force transmission member held by the retainer and rotating together with the retainer in the first circumferential unequal width space;
An input gear provided on the input rotating shaft and meshing with an output gear of the motor;
In the first circumferential unequal width space forming portion, the first rotational force transmitting member rotated in the circumferential direction is configured such that the first rotational transmission of the outer peripheral surface of the input rotary shaft and the cylindrical output rotary shaft is performed. A shape that bites between the cylindrical surfaces and transmits the rotational force of the input rotary shaft to the cylindrical output rotary shaft,
During rotation stop of the tubular output rotary shaft, the motor, the rotation direction in the immediately preceding time the rotation stop by rotating in the reverse direction, without rotating the cylindrical rotary output shaft, the input rotary shaft However, the lens barrel rotates in a direction opposite to the rotation direction immediately before the rotation stop. A manual operation ring that moves the moving lens in the optical axis direction by manual rotation operation;
A motor for driving the moving lens in the optical axis direction;
A first one-way input / output rotation transmission mechanism that transmits the driving force to the moving lens when the motor is driven and does not transmit the moving force of the moving lens to the motor when the manual operation ring is rotated. When,
In a lens barrel comprising:
The first one-way input / output rotation transmission mechanism is
A cylindrical input rotary shaft having a first axially orthogonal plane orthogonal to an axis parallel to the optical axis, and driven to rotate by the motor;
The cylindrical input rotary shaft is inserted so as to be relatively rotatable, the rotational movement and the movement of the moving lens in the optical axis direction are interlocked, and the outer peripheral surface of the cylindrical input rotary shaft is in contact with the inner peripheral surface of the cylindrical input rotary shaft. An output rotation shaft that forms a first rotation transmission cylindrical surface that forms an annular space therebetween, and is linked to the manual operation ring;
A first circumferentially unequal width in the circumferential direction that forms a part of the annular space between the cylindrical rotation surface and the first rotation transmission cylindrical surface formed on the inner circumferential surface of the cylindrical input rotation shaft. A first circumferentially unequal width space forming portion that forms a space;
It is always brought into contact with the first axially orthogonal plane by the first urging means, and is linked to the rotation of the cylindrical input rotation shaft, and the cylindrical shape about the axis of the cylindrical input rotation shaft. A plurality of first differential rotating members revolving in the same direction while being delayed from the input rotating shaft;
A retainer that revolves in the same direction as the first differential rotation member by being inserted into the annular space and being pressed by the first differential rotation member;
A first rotational force transmission member held by the retainer and rotating together with the retainer in the first circumferential unequal width space;
An input gear provided on the cylindrical input rotating shaft and meshing with an output gear of the motor;
In the first circumferential unequal width space forming portion, the first rotational force transmitting member rotated in the circumferential direction is configured such that the first rotation of the inner peripheral surface of the cylindrical input rotation shaft and the output rotation shaft is performed. A shape that bites between the transmission cylindrical surfaces and transmits the rotational force of the cylindrical input rotary shaft to the output rotary shaft,
During rotation stop of the output rotary shaft, the motor, the rotation direction in the immediately preceding time the rotation stop by rotating in the reverse direction, without rotating the output rotary shaft, the cylindrical rotary input shaft is, A lens barrel that rotates in a direction opposite to the rotation direction immediately before the rotation is stopped. The lens barrel according to claim 6 or 7,
The first circumferential unequal width space forming portion forms the first circumferential unequal width space between the cylindrical output rotation shaft or the first rotation transmission cylindrical surface of the output rotation shaft. To form multiple,
A lens barrel in which the first rotational force transmitting member is inserted into each first circumferentially unequal width space. The lens barrel according to any one of claims 6 to 8,
A lens barrel in which the first circumferentially unequal width space forming portion is a first unequal width groove having a radial depth that varies depending on a circumferential position . The lens barrel according to any one of claims 1 to 9,
A first pressing surface facing and parallel to the first axially orthogonal surface, and constantly urged toward the first axially orthogonal surface by the first urging means; A lens barrel including a first pressing member that sandwiches the first differential rotating member between the first axially orthogonal plane and the first differential rotating member. The lens barrel according to any one of claims 1 to 10,
A lens barrel in which the first rotational force transmitting member is a columnar member facing a direction parallel to the input rotation shaft or the axis of the cylindrical input rotation shaft. The lens barrel according to any one of claims 1 to 11,
The distance by which the movable lens is rotated in the optical axis direction by receiving rotational force from the manual operation ring or by receiving rotational force from the cylindrical output rotational shaft or the output rotational shaft. With an adjustment ring,
Between the distance adjustment ring and the manual operation ring, the rotational force of the manual operation ring is transmitted to the distance adjustment ring, but the rotational force of the distance adjustment ring is not transmitted to the manual operation ring. Lens barrel with input / output rotation transmission mechanism. The lens barrel according to claim 12, wherein
The second one-way input / output rotation transmission mechanism is
A second axially orthogonal surface orthogonal to the optical axis, and a circular polymerization portion that is polymerized in the radial direction with the distance adjusting ring, provided in the manual operation ring;
A second rotation transmission cylindrical surface that is formed on an inner peripheral surface or an outer peripheral surface of the distance adjusting ring and that faces the annular overlapping portion of the manually operated ring;
A second circumferentially non-uniform width forming a second circumferentially unequal width space having an unequal width in the circumferential direction is formed between the circular rotation portion of the manual operation ring and the second rotation transmission cylindrical surface. An equal width space forming section;
It is inserted into the second circumferential unequal width space, and is always brought into contact with the second axially orthogonal plane by the second biasing means, and in conjunction with the rotation of the manual operation ring, A second differential rotation member that revolves in the circumferential direction unequal width space forming portion around the axis of the manual operation ring in the same direction while being delayed from the manual operation ring;
A second rotational force transmitting member inserted into the second circumferentially unequal width space and revolved in the same direction as the second differential rotating member by being pushed by the second differential rotating member; With
In the second circumferential width unequal width space forming portion, the second rotational force transmitting member rotated in the circumferential direction includes the second circumferential width unequal width space forming portion and the second rotation transmission cylindrical surface. A lens barrel having a shape that bites in between and transmits the rotational force of the manual operation ring to the distance adjustment ring. The lens barrel according to claim 13,
A lens barrel in which a pair of the second rotational force transmitting members are inserted side by side in the circumferential direction so as to sandwich the second differential rotating member in the second circumferentially unequal width space. The lens barrel according to claim 13 or 14,
A lens barrel in which at least a part of the second circumferentially unequal width space forming portion is constituted by a second unequal width groove having a radial depth that varies depending on a circumferential position . The lens barrel according to any one of claims 13 to 15,
The second pressing surface is opposite to and parallel to the second axially orthogonal surface, and is always urged toward the second axially orthogonal surface by the second urging means, A lens barrel comprising a second pressing member that sandwiches the second differential rotating member between two axially orthogonal surfaces. The lens barrel according to any one of claims 13 to 16,
The second circumferential unequal width space forming portion forms a plurality of the second circumferential unequal width spaces between the second rotation transmission cylindrical surface of the distance adjustment ring,
A lens barrel in which the second differential rotating member and the second rotational force transmitting member are inserted into each second circumferentially unequal width space. The lens barrel according to any one of claims 13 to 17,
A lens barrel in which the second rotational force transmitting member is a columnar member facing a direction parallel to the axis of the manual operation ring. The lens barrel according to any one of claims 1 to 18,
The moving lens is a focus lens,
The motor is an AF motor,
A lens barrel in which the manual operation ring is a manual focus ring. The lens barrel according to any one of claims 1 to 18,
The moving lens is a zoom lens,
The motor is a zoom motor,
A lens barrel in which the manual operation ring is a zoom ring.

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