JP2011191379A - Lens barrel and optical equipment having lens barrel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the influence of tension generated from a U-turn portion of a flexible printed circuit board even if the distance between the lens holding frame and the U-turn portion of the flexible printed circuit board is changed by movement of a lens holding frame for holding the flexible printed circuit board. To obtain a lens barrel capable of smoothly moving a lens holding frame.
A moving unit that integrally moves a lens holding frame that holds a lens and an electronic unit on which an electronic component is mounted in the optical axis direction, and a control board that controls driving of the electronic unit and the electronic unit are electrically connected. A flexible printed circuit board to be connected, and the flexible printed circuit board includes a U-turn section that moves relatively when the moving unit moves in the optical axis direction. A flexible printed circuit board holding member that guides the flexible printed circuit board so that the curvature of the U-turn portion decreases as the distance from the center of gravity of the moving unit increases.
[Selection] Figure 3

Description

  The present invention relates to a lens barrel and an optical apparatus having the same, and is suitable for, for example, a digital camera or a video camera having a flexible printed wiring board.

  In a lens barrel used for a digital camera, a video camera, etc., an electronic unit including electronic parts such as an image stabilization unit and an aperture unit is provided on a lens holding frame that holds a lens group, thereby constituting a moving unit. There are many cases. This moving unit moves back and forth in the optical axis direction during zoom operation or focusing, for example.

  The electronic unit is connected via a flexible printed board to an electric circuit board (control board) on which electronic components such as a CPU for controlling the driving of the electronic unit are mounted. In particular, when an electronic unit provided on a lens holding frame moving in the optical axis direction and an electric circuit board are connected via a flexible printed circuit board, the flexible printed wiring board has U-turn portions formed at one or a plurality of positions. The At this time, when the moving unit moves in the optical axis direction, the position of the U-turn portion changes in the optical axis direction, and the electrical connection is ensured while allowing the moving unit to move freely.

  Generally, when tension is generated from the U-turn portion of the flexible printed circuit board, it is difficult to smoothly move the lens holding frame. There is known a lens barrel including a flexible printed wiring board in which a resistance generated in a U-turn portion of a flexible printed board is reduced and a lens holding frame is smoothly moved (Patent Document 1).

Japanese Patent Laid-Open No. 07-181576

  When the lens holding frame on which the flexible printed board is mounted moves in the optical axis direction, the distance between the lens holding frame and the U-turn portion of the flexible printed board changes. In the flexible printed circuit board structure of Patent Document 1, when the distance between the lens holding frame (lens) and the U-turn portion of the flexible printed wiring board is increased during zoom operation, the lens frame is tilted from the U-turn portion in proportion to the distance. The power to do so increases. Therefore, at this time, the lens holding frame may fall down due to the force generated from the U-turn portion, and the optical performance may deteriorate. For this reason, it becomes important to reduce the influence of the tension generated from the U-turn portion of the flexible printed circuit board.

  The present invention provides a lens barrel that can smoothly move a lens holding frame even if the distance between the lens holding frame and the U-turn portion of the flexible printed board changes due to movement of the lens holding frame that holds the flexible printed board. With the goal.

The lens barrel of the present invention includes a lens holding frame that holds a lens and a moving unit that integrally moves an electronic unit on which an electronic component is mounted in the optical axis direction, and a control that controls driving of the electronic unit and the electronic unit. A lens barrel including a U-turn portion that has a flexible printed circuit board that is electrically connected to the circuit board, and the flexible printed circuit board moves relatively when the moving unit moves in the optical axis direction;
A flexible printed circuit board holding member that guides the flexible printed circuit board is provided so that the curvature of the U turn section decreases as the U turn section moves away from the center of gravity of the moving unit.

  According to the present invention, a lens mirror that can smoothly move the lens holding frame even when the distance between the lens holding frame and the U-turn portion of the flexible printed board changes due to the movement of the lens holding frame that holds the flexible printed board. A tube is obtained.

It is sectional drawing when the lens barrel of Example 1 of this invention is applied to the interchangeable lens barrel for single-lens reflex cameras. FIG. 2 is a part of an exploded perspective view of the interchangeable lens barrel shown in FIG. 1. 2A and 2B are cross-sectional views of the main part of the interchangeable lens barrel shown in FIG. 1, in which FIG. 1A shows a wide angle and FIG. Schematic diagram of essential parts of the optical apparatus of the present invention

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the lens barrel of the present invention, a lens holding frame (third lens barrel) 103 that holds a lens group that moves in the optical axis direction and an electronic unit (electric diaphragm unit) 1B on which electronic components are mounted are integrated with the optical axis. And a moving unit 1D that moves in the direction. Furthermore, it has the flexible printed circuit board 301 which electrically connects with the control board 126 which controls the drive of the electronic unit 1B. The flexible printed circuit board 301 has a U-turn portion (folding portion) 302 that relatively moves when the moving unit 1D moves in the optical axis direction. Further, a flexible printed circuit board holding member 127 is provided for guiding the flexible printed circuit board 301 so that the curvature (reciprocal of the radius of curvature) of the U turn section 302 becomes smaller as the U turn section 302 moves away from the center of gravity P ₀ of the moving unit 1D. . The flexible printed board holding member 127 is provided in the lens holding frame 103 or the electronic unit 1B. The flexible printed board holding member 127 has an inclined portion 127A that is inclined with respect to the optical axis. In accordance with this inclined portion 127A is a distance between the center of gravity P ₀ and the U-turn portion 302 of the mobile unit 1D leaves, shaped like the curvature becomes small U-turn portion 302, for example, a flat surface portion which is inclined with respect to the optical axis ing.

  FIG. 1 shows a cross-sectional structure when the interchangeable lens 100 having the lens barrel of Embodiment 1 of the present invention is cut along a plane passing through the optical axis AX. FIG. 2 shows a part of an exploded perspective view of the interchangeable lens 100 of FIG. The interchangeable lens 100 has a six-group photographic lens having first to sixth lens groups L1 to L6 in order from the object side (left side of the drawing). The second lens unit L2 and the fifth lens unit L5 are fixed lens units that do not move during zooming. The second lens group L2 is a correction lens group (shift lens group) movable in the direction perpendicular to the optical axis for image blur correction. Further, the fourth lens group L4 and the sixth lens group L6 move in the optical axis direction by the focusing operation.

  Further, during the zoom operation, the first lens unit L1, the third lens unit L3, the fourth lens unit L4, and the sixth lens unit L6 move in the optical axis direction. The first to sixth lens groups L1 to L6 include a first lens barrel 101, a second lens barrel 102, a third lens barrel 103, a fourth lens barrel 104, a fifth lens barrel 105, and Each is held by a six-lens barrel 106.

  The interchangeable lens 100 has a mount 107 for detachably mounting on a camera body (not shown). The mount 107 is provided with a connector 108 for communication between the camera body and the interchangeable lens 100. The mount 107 is attached to the base cylinder 109 with screws. The base cylinder 109 is fixed to the guide cylinder 110 with screws. The guide tube 110 corresponds to a fixed tube that does not move during zooming and focus adjustment.

  The guide tube 110 holds a stationary second lens barrel 102 and a fifth lens barrel 105, respectively. Rollers are attached to the second lens barrel 102 and the fifth lens barrel 105 by screws. By engaging these rollers with holes provided in the guide tube 110, the second lens barrel 102 and the fifth lens barrel 105 are held at fixed positions in the optical axis direction with respect to the guide tube 110, respectively. The A main cam cylinder (rotating cylinder) 111 is rotatably disposed outside the guide cylinder 110. The main cam cylinder 111 is bayonet-coupled to the guide cylinder 110 through a concave groove 111A. The main cam cylinder 111 does not move in the optical axis direction with respect to the guide cylinder 110 (that is, at a fixed position in the optical axis direction) and can rotate around the optical axis.

  The main cam cylinder 111 is formed with a first cam groove 111B, a second cam groove 111C, and a third cam groove 111D. The first cam groove portion 111B, the second cam groove portion 111C, and the third cam groove portion 111D move the first lens barrel 101, the third lens barrel 103, and the fourth lens barrel 104, respectively, in the optical axis direction during the zoom operation. It is for making it happen. A rectilinear cylinder 112 that holds the first lens barrel 101 and moves straight along the optical axis is provided outside the main cam cylinder 111, and a zoom operation ring 113 is provided outside the rectilinear cylinder 112. ing.

  In order to fix the first lens barrel 101 to the rectilinear barrel 112, a cam follower 114 and a shaft 115 are used. When the first lens barrel 101 is inserted into the rectilinear barrel 112, the groove portion 101A of the first lens barrel 101 and the shaft 115 are assembled together.

  Next, the cam follower 114 is attached to the hole of the first lens barrel 101 with a screw. The cam follower 114 is fitted in the hole of the first lens barrel 101 and the position adjusting cam groove (adjusting groove) 112A of the rectilinear cylinder 112. Therefore, when the interchangeable lens 100 is assembled, the position of the first lens barrel 101 in the optical axis direction can be adjusted using the position adjusting cam groove 112A.

  The rectilinear cylinder 112 holding the first lens barrel 101 is fitted into a first cam groove 111B formed in the main cam cylinder 111 and a first rectilinear groove 110A provided in the guide cylinder 110 so as to extend in the optical axis direction. The cam follower is attached with screws. Further, a cam follower that is fitted to a cam groove 113A provided on the inner periphery of the zoom operation ring 113 is attached to the rectilinear cylinder 112 with a screw. The zoom operation ring 113 is bayonet-coupled to the guide tube 110 through the concave groove 113B, and the zoom operation ring 113 does not move in the optical axis direction with respect to the guide tube 110 (that is, at a fixed position in the optical axis direction). It can be rotated around the optical axis.

  A cam follower is attached to the third lens barrel 103 with a screw, and the cam follower is provided in the second cam groove portion 111 </ b> C formed in the main cam barrel 111 and in the second straight advancement provided in the guide barrel 110 so as to extend in the optical axis direction. It fits into the groove 110B. A fourth lens barrel base 116 is disposed outside the fourth lens barrel 104. A cam follower is attached to the fourth lens barrel base 116 with screws, and the cam follower is provided in a third cam groove portion 111D formed in the main cam barrel 111 and in the guide barrel 110 so as to extend in the optical axis direction. It is fitted in the straight groove part 110C.

  A zoom key 117 is attached to the main cam cylinder (rotating cylinder) 111 with screws. The zoom key 117 is engaged with a sub-cam barrel (cam barrel) 118 that rotates and feeds the sixth lens barrel 106 in the optical axis direction according to a cam groove 110D formed in the guide barrel 110 during a zoom operation. The sub cam cylinder 118 is disposed inside the guide cylinder 110, and a cam follower that fits in a cam groove portion 110 </ b> D formed in the guide cylinder 110 is attached to the outer periphery of the sub cam cylinder 118 with a screw. Therefore, when the main cam cylinder 111 rotates, the sub cam cylinder 118 rotates around the optical axis together with the main cam cylinder 111 and moves in the optical axis direction with respect to the main cam cylinder 111.

  The sub cam barrel 118 is provided with a cam groove 118A that engages with the cam follower 122 provided on the sixth lens barrel 106. A rectilinear guide cylinder 119 is disposed inside the sub cam cylinder 118. The rectilinear guide cylinder 119 is bayonet-coupled with the guide cylinder 110 through the concave groove 119A, and the rectilinear guide cylinder 119 does not move in the optical axis direction with respect to the guide cylinder 110 (that is, at a fixed position in the optical axis direction). It can be rotated around the optical axis. The rectilinear guide tube 119 is provided with a first rectilinear groove portion 119B and a second rectilinear groove portion 119C extending in the optical axis direction, respectively, and a focus roller 120 is attached by screws. A focus key 201 of a focus drive unit (focus drive mechanism) 1A described later is engaged with the focus roller 120 in the direction around the optical axis. Inside the rectilinear guide tube 119, a fourth lens barrel 104, a fourth lens barrel base 116, and a sixth lens barrel 106 are arranged.

  A cam follower 121 is attached to the outer periphery of the fourth lens barrel 104 with screws. The cam follower 121 is engaged with a focus cam groove 116A provided on the fourth lens barrel base 116 and a first rectilinear groove 119B provided on the rectilinear guide cylinder 119. A cam follower 122 is attached to the outer periphery of the sixth lens barrel 106 with screws. The cam follower 122 is engaged with a focus cam groove 118A provided in the sub cam cylinder 118 and a second rectilinear groove 119C provided in the rectilinear guide cylinder 119. A focus drive unit 1 </ b> A is arranged outside the guide tube 110. The focus base cylinder 202 in the focus drive unit 1A is attached to the base cylinder 109 with screws, and the exterior ring 123 is attached to the focus base cylinder 202 with screws.

  A focus operation ring 124 is disposed outside the outer ring 123, and a cam follower attached to the outer periphery of the outer ring 123 with a screw is engaged with a groove 124 </ b> A provided on the inner periphery of the focus operation ring 124. . For this reason, the focus operation ring 124 can be rotated around the optical axis at a fixed position in the optical axis direction outside the exterior ring 123.

  The focus operation ring 124 is coupled to the fixed position rotation ring 203 in the focus drive unit 1A. For this reason, the rotational force of the focus operation ring 124 can be transmitted to the focus drive unit 1A. The differential drive mechanism 204 is built in the focus drive unit 1A. The rotational force output from the differential operation mechanism 204 is transmitted to the rectilinear guide cylinder 119 via the focus key 201 engaged with the focus roller 120 attached to the rectilinear guide cylinder 119, and rotates it.

  An electric diaphragm unit (electronic unit) 1B is attached to the image side of the third lens barrel (lens holding frame) 103 with a screw, and moves in the optical axis direction integrally with the third lens barrel 103 during zoom operation. To do. The third lens barrel 103 and the electric diaphragm unit 1B constitute an element of the moving unit 1D.

  As described above, the second lens unit L2 is a correction lens unit that can move in the direction perpendicular to the optical axis. The anti-vibration unit 1C includes a second lens barrel 102 that holds the second lens unit L2, and two sets for moving the second lens barrel 102 in two directions perpendicular to the optical axis and perpendicular to each other. It has anti-vibration actuators (magnets and coils). Further, the image stabilization unit 1C includes a position detection element that detects the position of the second lens barrel 102, and a drive control board that controls the image stabilization actuator using a signal from the position detection element. The anti-vibration drive unit is configured by the anti-vibration actuator, the position detection element, and the drive control board. An angular velocity sensor (gyro sensor) 125 is attached to the guide tube 110. A control board 126 on which a lens system control circuit is configured is attached to the base cylinder 109.

  Next, an operation when the zoom operation ring 113 is operated during zooming in the interchangeable lens 100 configured as described above will be described. In the following description, rotating around the optical axis is simply referred to as “rotating”, and moving in the optical axis direction is referred to as “going straight”. When the zoom operation ring 113 is operated to rotate, the rotational force is transmitted to the main cam cylinder 111 via the rectilinear cylinder 112, and the main cam cylinder 111 is rotated. As described above, the main cam cylinder 111 rotates at a fixed position in the optical axis direction with respect to the guide cylinder (fixed cylinder) 110.

  When the main cam cylinder 111 rotates, the zoom key 117 attached to the main cam cylinder 111 rotates integrally with the main cam cylinder 111, and the sub cam cylinder 118 engaged with the zoom key 117 also rotates integrally with the main cam cylinder 111 by the same amount. Since the cam follower attached to the sub cam cylinder 118 is engaged with a cam groove 110D formed in the guide cylinder 110, the sub cam cylinder 118 moves straight in the optical axis direction with respect to the main cam cylinder 111. That is, the sub cam cylinder 118 advances straight relative to the main cam cylinder 111 while rotating.

  A rotational force acts on the straight guide cylinder 119 that is bayonet-coupled to the guide cylinder 110 due to the friction of the bayonet-coupled portion. However, the focus key 201 of the focus drive unit 1A is engaged with the focus roller 120 attached to the rectilinear guide tube 119. The focus key 201 is held so as not to rotate by a friction holding force (a friction holding force larger than the friction of the bayonet coupling portion) in the differential operation mechanism of the focus drive unit 1A. For this reason, the rotation of the straight guide cylinder 119 is prevented. When the sub cam barrel 118 rotates and advances straight, the sixth lens barrel 106 having the cam follower 122 that engages with the cam groove 118A of the sub cam barrel 118 and the second rectilinear groove 119C of the rectilinear guide barrel 119 does not rotate, and does not rotate. Go straight to 119.

  Cam followers are engaged with the first, second, and third cam groove portions 111B to 111D provided in the main cam cylinder 111 and the first, second, and third rectilinear groove portions 110A to 110C provided in the guide cylinder 110, respectively. Therefore, when the main cam barrel 111 rotates, the rectilinear barrel 112 holding the first lens barrel 101 having the cam follower, the third lens barrel 103, and the fourth lens barrel 104 do not rotate with respect to the main cam barrel 111. Go straight. As described above, when the zoom operation ring 113 is rotated, the first lens barrel 101, the third lens barrel 103, the fourth lens barrel 104, and the sixth lens barrel 106 go straight, and the interchangeable lens ( The zoom optical system) 100 is zoomed (focal length is changed).

  Next, an operation when the focus operation ring 124 is operated during focus adjustment will be described. When the focus operation ring 124 is rotated, the rotational force rotates the rectilinear guide cylinder 119 via the differential operation mechanism 204 and the focus key 201 of the focus drive unit 1A. At this time, the main cam cylinder 111 and the sub cam cylinder 118 do not rotate. When the rectilinear guide cylinder 119 rotates, the sixth lens barrel 106 having the cam follower 122 engaged with the cam groove 118A of the sub cam cylinder 118 and the second rectilinear groove 119C of the rectilinear guide cylinder 119 advances while rotating. At the same time, the fourth lens barrel 104 having the cam follower 121 engaged with the focus cam groove portion 116A of the fourth lens barrel base 116 and the rectilinear groove portion 119B of the rectilinear guide barrel 119 advances straight while rotating. As described above, when the focus operation ring 124 is rotated, the fourth lens barrel 104 and the sixth lens barrel 106 go straight while rotating, and the focus of the interchangeable lens (zoom optical system) can be adjusted. .

  Next, an autofocus operation when the focus drive unit 1A operates according to an autofocus signal from a camera body (not shown) will be described. The focus drive unit 1A includes a vibration type motor (drive means). When receiving an autofocus signal from the camera body side, the control board 126 drives the vibration type motor. The rotational force of the vibration type motor rotates the focus key 201 via the differential operation mechanism 204 and rotates the rectilinear guide cylinder 119 via the focus key 201. At this time, the main cam cylinder 111 and the sub cam cylinder 118 do not rotate.

  When the rectilinear guide cylinder 119 rotates, the sixth lens barrel 106 having the cam follower 122 engaged with the cam groove 118A of the sub cam cylinder 118 and the second rectilinear groove 119C of the rectilinear guide cylinder 119 advances while rotating. At the same time, the fourth lens barrel 104 having the cam follower 121 engaged with the cam groove portion 116A of the fourth lens barrel base 116 and the rectilinear groove portion 119B of the rectilinear guide barrel 119 advances straight while rotating. As described above, when the focus driving unit 1A is operated by the driving force from the vibration type motor, the fourth lens barrel 104 and the sixth lens barrel 106 move straight while rotating, and the interchangeable lens (zoom optical system) is rotated. Auto focus is possible.

  3 is an enlarged view of a part of the cross-sectional view of the interchangeable lens 100 shown in FIG. 1. FIG. 3A shows the zoom position at the wide-angle end, and FIG. 3B shows the zoom position at the telephoto end. Yes. As described above, the electric diaphragm unit 1B is attached to the third lens barrel 103, and moves straight in the optical axis direction integrally with the third lens barrel 103 during zooming. The electric diaphragm unit 1 </ b> B has a flexible printed circuit board 301, and the flexible printed circuit board 301 is connected to the control board 126.

  A flexible printed board holding member 127 that holds (guides) the flexible printed board 301 is attached to the third lens barrel 103 with screws. Reference numeral 127 </ b> A denotes an inclined portion that extends from the flexible printed circuit board holding member 127. The guide tube 110 and the inclined portion 127A become narrower toward the first lens unit L1. The flexible printed circuit board 301 is sandwiched between the inclined portion 127A of the flexible printed circuit board holding member 127 and the guide tube 110, and the U-turn section 302 of the flexible printed circuit board 301 advances and retreats in the optical axis direction during zooming. A moving unit 1D that integrally moves, which includes the third group lens L3, the third lens barrel 103, the electric diaphragm unit 1B, and the like, receives a reaction force generated in the U-turn portion 302 of the flexible printed circuit board 301. If this reaction force is large, the moving unit 1D may fall with respect to the optical axis. That is, the third group lens L3 may fall with respect to the optical axis.

The reaction force generated in the U-turn portion 302 of the flexible printed circuit board 301 is determined by the curvature of the U-turn portion 302, and the reaction force increases as the curvature of the U-turn portion 302 increases. The reaction force in FIG. 3A is larger than that in FIG. 3B. Moreover, the force applied to the mobile unit 1D (moment) is determined by the distance in the optical axis direction between the center of gravity P ₀ and the U-turn portion 302 of the mobile unit 1D, the force distance in the optical axis direction is applied to the mobile unit 1D longer Will grow. The moment in FIG. 3B is larger than that in FIG. As shown in FIGS. 3A and 3B, the distance in the optical axis direction between the center of gravity P ₀ and the U-turn portion 302 is longer in FIG. 3B than in FIG. The moment applied to 1D increases. However, the curvature of the U-turn portion 302 of the flexible printed circuit board 301 decreases as the distance from the center of gravity P ₀ increases along the inclined portion 127A of the flexible printed circuit board holding member 127, and the reaction force decreases.

  Accordingly, the force applied to the moving unit 1D can be reduced even in the zoom position at the telephoto end in FIG. 3B, that is, the tilt of the third lens unit L3 can be suppressed. Thereby, a lens barrel having good optical performance is obtained.

  In the above embodiment, the flexible printed circuit board holding member 127 may be disposed anywhere in the lens barrel as long as it moves with the movement of the moving unit 1D and the curvature of the U-turn portion changes.

The distance between the U-turn portion 302 of the mobile unit 1D of the gravity center P ₀ and the flexible printed circuit board 301 as described above when the telephoto is longer than the wide angle. At this time, the curvature of the U-turn portion 302 decreases as the distance from the center of gravity P ₀ increases along the shape of the flexible printed circuit board holding member 127. Therefore, it is possible to reduce the force applied to the moving unit 1D even during telephoto, that is, it is possible to suppress the third group lens L3 from falling. Thereby, a lens with good optical performance can be provided.

Next, an embodiment in which the lens barrel shown in the above-described embodiment is applied to a single-lens reflex camera as an optical apparatus will be described. FIG. 4 is a schematic diagram of a main part of a single-lens reflex camera (optical apparatus). In FIG. 4, LK is the lens barrel of the above-described embodiment, and has an imaging optical system _Lo . CB is a camera body, and reflects the light beam from the imaging optical system _Lo upward. The quick return mirror CM, penta prism CP which converts the imaging optical system L _o focusing plate CP which is disposed on the image forming position of a reverse image formed on the focusing plate CP into an erect image, for observing the erect image It is composed of an eyepiece lens CS and the like. CI is a photosensitive surface on which a solid-state imaging device (photoelectric conversion device) such as a CCD sensor or a CMOS sensor or a silver salt film is disposed. At the time of shooting, the quick return mirror CM is retracted from the optical path, and an image is formed on the photosensitive surface CI by the imaging optical system _Lo .

  As mentioned above, although the Example of this invention was described, this invention is not limited only to an Example, A change etc. are possible within the scope of the present invention. The dimensions, materials, shapes, relative arrangements, and the like of the components described in the above embodiments are not intended to limit the scope of the present invention unless otherwise specified, and are merely illustrative examples. Absent. For example, although the interchangeable lens has been described in the above embodiment, the present invention can also be applied to an optical apparatus such as a digital still camera or a video camera that has a zoom optical system integrally.

103 Third lens barrel 126 Control board 127 Flexible printed board holding member 1A Focus drive unit 1B Electric diaphragm unit 301 Flexible printed board 302 U-turn part 1D Moving unit

Claims (5)

A lens holding frame for holding a lens and a moving unit that integrally moves an electronic unit on which an electronic component is mounted in the optical axis direction are electrically connected to a control board that controls driving of the electronic unit. In a lens barrel that includes a flexible printed circuit board, and the flexible printed circuit board includes a U-turn portion that relatively moves when the moving unit moves in the optical axis direction,
A lens barrel comprising: a flexible printed circuit board holding member that guides the flexible printed circuit board so that the curvature of the U turn section decreases as the U turn section moves away from the center of gravity of the moving unit. The flexible printed circuit board holding member is
2. The lens barrel according to claim 1, further comprising an inclined portion inclined with respect to the optical axis.   The inclined portion of the flexible printed circuit board holding member is inclined with respect to the optical axis so that the curvature of the U-turn portion decreases as the distance between the center of gravity of the moving unit and the U-turn portion increases. The lens barrel according to claim 2. The lens barrel according to claim 1, wherein the flexible printed board holding member is provided in the lens holding frame or the electronic unit.   An optical apparatus comprising the lens barrel according to any one of claims 1 to 4.