JP2012103298A - Lens barrel and optical equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small sized lens barrel and an optical equipment with reduced magnetic interference between magnets respectively driving a vibration damping lens and a focus lens.SOLUTION: The lens barrel includes: a focus movement frame capable of being moved in the optical axis direction for retaining a first lens; a vibration damping unit capable of being moved in the optical axis direction and in the direction orthogonal to the optical axis direction for retaining a second lens; first driving means equipped with a first magnet provided on a first fixed member for driving the first lens; and second driving means equipped with a second magnet provided on the vibration damping unit for driving the second lens. In this case, the first magnet is arranged so as to have the same magnetic pole in the optical axis direction. The second magnet is arranged so as to have two different magnetic poles in the direction orthogonal to the optical axis direction. The first magnet and the second magnet are arranged so that a first magnetic line formed by the first magnet and a second magnetic line formed by the second magnet repulse with each other viewed from the optical axis direction.

Description

  The present invention relates to a lens barrel having a plurality of movable groups, and an optical apparatus such as a digital still camera or a video camera provided with such a lens barrel.

  2. Description of the Related Art Conventionally, there has been known a lens barrel (optical device) configured such that an optical element such as a lens or a diaphragm can be moved in an optical axis direction by an actuator such as a voice coil motor or a stepping motor. Such lens barrels include a focus lens group movable in the optical axis direction and an anti-vibration lens group capable of correcting camera shake. For example, an anti-vibration lens group and a focus lens group include Adjacent to each other, both are driven by a VCM (voice coil). In Patent Document 1, in order to prevent an increase in the size of a lens barrel, a lens mirror in which a VCM that is a driving mechanism for an anti-vibration lens group and a focus lens group is arranged so that a part thereof overlaps when viewed from the lateral direction of the optical axis. A cylinder is disclosed.

JP 2007-171299 A

  The VCM arrangement of the anti-vibration lens group and the focus lens group as in Patent Document 1 is effective for reducing the size of the lens barrel, but the influence of magnetic interference becomes stronger because the distance between the VCMs becomes closer. In the case of an optical system in which the anti-vibration lens group is movable in the optical axis direction, the influence of magnetic interference changes according to the position in the optical axis direction. For this reason, problems such as unexpected roll behavior and image skipping of the image stabilizing lens group accompanying movement in the optical axis direction are likely to occur. In addition, when a shield structure or the like is employed to prevent magnetic interference, the lens barrel is increased in size and cost.

  Therefore, the present invention provides a small lens barrel and an optical apparatus that reduce magnetic interference between magnets that drive the vibration-proof lens and the focus lens.

  A lens barrel according to one aspect of the present invention includes a focus moving frame that holds a first lens that is movable in the optical axis direction, and a second lens that is movable in the optical axis direction and a direction orthogonal to the optical axis direction. An anti-vibration unit for holding the first lens, a first coil provided on the focus moving frame, and a first magnet provided on the first fixing member, and a first driving means for driving the first lens, and a second fixing. A second coil provided on the member and a second magnet provided on the vibration isolation unit, and a second driving means for driving the second lens, wherein the first magnet is disposed in the optical axis direction. The second magnet is disposed so as to have two different magnetic poles in a direction orthogonal to the optical axis direction, and the first magnet and the second magnet are disposed on the optical axis. Direction Look, a second magnetic flux line formed by the first magnetic flux lines and the second magnet is formed by the first magnet is disposed so as to repel each other.

  An optical device including the lens barrel also constitutes another aspect of the present invention.

  Other objects and features of the present invention are illustrated in the following examples.

  According to the present invention, it is possible to provide a small lens barrel and an optical apparatus that reduce magnetic interference between magnets that drive the vibration-proof lens and the focus lens.

It is a perspective view of the optical apparatus in a present Example. It is a disassembled perspective view of the lens barrel in a present Example. It is sectional drawing of the lens-barrel in a present Example. It is a block diagram of the lens barrel in a present Example. In the lens barrel of the present embodiment, it is a schematic diagram showing respective movable ranges of the image stabilizing unit 3 and the focus moving frame 4 and the interference area between them. In the lens barrel of the present embodiment, the fourth lens unit L4 is viewed from the imaging surface side with the CCD holder removed. FIG. 5 is an exploded perspective view of the lens barrel of the present embodiment in a state where the image stabilization unit 3 and the focus movement frame 4 are inserted into a guide bar. FIG. 7 is a cross-sectional view (a diagram when the third lens unit L3 and the fourth lens unit L4 are respectively located closest to the object side) cut along the AA plane in FIG. 6 in the lens barrel of the present embodiment. FIG. 7 is a cross-sectional view (a diagram when the third lens unit L3 and the fourth lens unit L4 are each located closest to the imaging surface) taken along the AA plane in FIG. 6 in the lens barrel of the present embodiment. . FIG. 7 is a cross-sectional view (a diagram when the third lens unit L3 and the fourth lens unit L4 are respectively located closest to the object side) cut along the BB plane in FIG. 6 in the lens barrel of the present embodiment. In the lens barrel of the present embodiment, it is an arrangement diagram of a vibration-proof drive magnet and a focus drive magnet.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In each figure, the same members are denoted by the same reference numerals, and redundant description is omitted.

  First, an optical apparatus (video camera) in an embodiment of the present invention will be described with reference to FIG. FIG. 1 is an external view of a video camera in the present embodiment. L represents a lens barrel capable of zooming, and B represents a camera body. Inside the camera body B, an image sensor for recording a subject image formed by a photographing optical system provided inside the lens barrel L is housed. This embodiment can be applied not only to a video camera but also to an optical device such as a digital still camera or a silver halide photography camera. In the case of a silver salt photographic camera, a silver salt film is housed in the camera body B instead of an image sensor.

  Next, the lens barrel L in the present embodiment will be described with reference to FIGS. FIG. 2 is an exploded perspective view of a lens barrel provided in the optical apparatus according to the present embodiment. FIG. 3 is a cross-sectional view of the lens barrel. In FIG. 2, arrows X and -X indicate the optical axis direction, and the photographing optical system is a variable magnification optical system (zoom lens system) constituted by four lens units.

  2 and 3, L1 is a first lens unit, and L2 is a second lens unit that performs a zooming action by moving in the optical axis direction. L3 is a third lens unit (second lens) that shifts in a direction orthogonal to the optical axis of the photographing optical system (optical axis orthogonal direction) to reduce image blur and is movable in the optical axis direction. is there. L4 is a fourth lens unit (first lens) that performs focus adjustment by moving in the optical axis direction. Reference numeral 1 denotes a first lens frame that holds the first lens unit L1, and 2 denotes a variator moving frame that holds the second lens unit L2 and is movable in the optical axis direction. 3 is an anti-vibration unit that holds the third lens unit L3 and can move in the optical axis direction and a direction perpendicular to the optical axis direction, and 4 is a focus movement that holds the fourth lens unit L4 and can move in the optical axis direction. It is a frame. Reference numeral 5 denotes a fixed barrel, and 6 denotes a rear barrel. The fixed lens barrel 5 has a rear end coupled to the rear lens barrel 6 and a front end fixed to the first lens frame 1 in order to fix the first lens unit L1 at a predetermined position. A CCD holder 7 holds an image pickup device (photoelectric conversion device) such as a CCD sensor or a CMOS sensor (not shown), and is fixed to the rear barrel 6.

  Reference numerals 8a and 8b denote guide bars (first guide bar and second guide bar), both ends of which are held by the fixed barrel 5 and the rear barrel 6, respectively. Further, the guide bars 9 a and 9 b (third guide bar and fourth guide bar) and the guide bars 10 a and 10 b (fifth guide bar and sixth guide bar) are arranged at both ends by the rear barrel 6 and the CCD holder 7. Is held. The variator moving frame 2 is supported by guide bars 8a and 8b so as to be movable in the optical axis direction. The vibration isolation unit 3 is supported by the guide bars 9 a and 9 b so as to be movable in the optical axis direction, and is fixed to the rear barrel 6. A light amount adjustment unit (not shown) that changes the amount of light incident on the photographing optical system is fixed to the rear barrel 6. The light quantity adjustment unit changes the aperture diameter by moving two or more diaphragm blades in the direction perpendicular to the optical axis. Further, the light quantity adjustment unit is configured such that a gradation ND filter (not shown) can advance and retreat with respect to the optical path independently of the diaphragm blades. The focus moving frame 4 is supported by the guide bars 10a and 10b so as to be movable in the optical axis direction.

  Next, the configuration of the drive unit that moves the variator moving frame 2 (second lens unit L2) will be described. Reference numeral 201 denotes a stepping motor that drives the variator moving frame 2 in the optical axis direction. A lead screw 202 is formed on the output shaft of the stepping motor 201. The stepping motor 201 is fixed to the rear barrel 6 via the support member 203. A rack 204 attached to the variator moving frame 2 is engaged with the lead screw 202. Therefore, when the stepping motor 201 is energized and the lead screw 202 rotates, the variator moving frame 2 is driven in the optical axis direction. The rack 204 and the variator moving frame 2 are prevented from rattling by the biasing force of the torsion coil spring 205.

  A zoom reset 206 detects the reference position of the variator moving frame 2. The zoom reset 206 is configured by a photo interrupter that detects switching between the light shielding state and the light transmitting state due to the movement of the light shielding unit 207 formed in the variator moving frame 2 in the optical axis direction. The zoom reset 206 is fixed to the rear barrel 6 via the substrate. The variator moving frame 2 holds the sensor magnet 208 magnetized in the multi-axis direction in the optical axis direction, and reads changes in the lines of magnetic force accompanying the movement of the sensor magnet 208 at a position facing the sensor magnet 208 in the rear barrel 6. The MR sensor 209 is fixed. By using the signal from the MR sensor 209, the amount of movement of the variator moving frame 2, that is, the second lens unit L2, from the predetermined reference position can be detected.

  Next, the configuration of the drive unit that moves the image stabilization unit 3 (third lens unit L3) will be described. Reference numeral 301 denotes a stepping motor that drives the image stabilization unit 3 in the optical axis direction. A lead screw 302 is formed on the output shaft of the stepping motor 301. The stepping motor 301 is fixed to the rear barrel 6 via a support member 303. A rack 304 attached to the vibration isolation unit 3 is engaged with the lead screw 302. For this reason, when the stepping motor 301 is energized and the lead screw 302 rotates, the image stabilization unit 3 is driven in the optical axis direction. Note that the rack 304 and the vibration isolation unit 3 are prevented from rattling by the biasing force of the torsion coil spring 305. Reference numeral 306 denotes a zoom reset that detects the reference position of the image stabilization unit 3. The zoom reset 306 is configured by a photo interrupter that detects switching between a light shielding state and a light transmitting state due to movement of the light shielding unit 307 formed in the image stabilizing unit 3 in the optical axis direction. The zoom reset 306 is fixed to the rear barrel 6 via the substrate. The zoom reset 306 configured by a photo interrupter detects the switching between the light shielding state and the light transmitting state of the light shielding unit 307 within the movable range of the image stabilizing unit 3 and outside the movable range of the focus moving frame 4. Is set.

  Next, the configuration of the focus driving unit (first driving unit) that moves the focus moving frame 4 (fourth lens unit L4) will be described. Reference numerals 401, 402, and 403 respectively close a coil (first coil), a magnet (first magnet), and a magnetic flux that constitute a focus motor (voice coil motor) that drives the fourth lens unit L4 in the optical axis direction. This is a yoke member. The coil 401 is provided in the focus movement frame 4. The magnet 402 is provided inside the yoke member 403, and the yoke member 403 is attached to the CCD holder 7 (first fixing member). Here, when a current is passed through the coil 401, a Lorentz force is generated by repulsion between the magnetic lines generated between the magnet 402 and the coil 401, and the fourth lens unit L4 is driven in the optical axis direction together with the focus moving frame 4. The The focus moving frame 4 holds a sensor magnet 404 magnetized in a multipolar manner in the optical axis direction, and changes in the lines of magnetic force accompanying the movement of the sensor magnet 404 are located at positions facing the sensor magnet 404 in the rear barrel 6. The MR sensor 405 for reading is fixed. By using the signal from the MR sensor 405, it is possible to detect the amount of movement of the focus movement frame 4, that is, the fourth lens unit L4 from a predetermined reference position. The focus moving frame 4 is energized to the coil, moves in the direction of an arrow -X parallel to the object side, that is, the optical axis, and detects a state in contact with the mechanical end as a reference position.

  As described above, in the configuration of the focus drive unit, when the coil 401 is energized (energized state), Lorentz force is generated, and the focus moving frame 4 is driven in the optical axis direction. However, in a state where the coil 401 is not energized (non-energized state), the driving force to the focus moving frame 4 is not generated, and the focus moving frame 4 itself has no self-holding force. The self-holding force is a force capable of stopping the movable coil 401 and the focus moving frame 4 provided with the coil 401 in place in a non-energized state.

  Next, driving methods of the second lens unit L2, the third lens unit L3, and the fourth lens unit L4 will be described with reference to FIG. FIG. 4 is a block diagram of the lens barrel in the present embodiment. In FIG. 4, reference numeral 11 denotes a control unit that outputs control signals to the stepping motors 201 and 301 and the coil 401 in accordance with the zoom reset output signal and the mode of the optical apparatus main body. The control means 11 includes a microcomputer or the like. Reference numeral 12 denotes storage means for storing mode information of the control means 11.

  The lens barrel of the present embodiment can bring the focal length of the lens closer to the wide-angle side when compared with the conventional lens with the same lens size. In the conventional lens barrel, the third lens unit L3 is fixed regardless of the focal length and does not move in the optical axis direction. On the other hand, in the present embodiment, the third lens unit L3 follows a trajectory that moves in the optical axis direction from the TELE state to the WIDE state when the focal length is varied. In the WIDE state, the third lens unit L3 is located on the imaging surface side. On the other hand, in the TELE state, the third lens unit L3 is located on the object side. Further, the fourth lens unit L4 adjacent to the third lens unit L3 and having a function of focusing and focusing is also moved in the optical axis direction during the focusing operation. When the subject distance is on the close side, it is possible to focus by moving the fourth lens unit L4 to the object side. On the other hand, when the subject distance is on the infinity side, the fourth lens unit L4 can be brought into focus by moving to the imaging surface side.

  FIG. 5 is a schematic diagram showing the mechanical movable ranges of the image stabilizing unit 3 and the focus moving frame 4 and the interference areas between them in the present embodiment. In FIG. 5, X1 to X4 represent the movable range of the image stabilizing unit 3 (third lens unit L3), X1 represents the TELE position of the third lens unit L3, and X4 represents the WIDE position of the third lens unit L3. . X3 indicates a detection position where the zoom reset 306 described above detects the light shielding and light projection state in order to detect the initial position of the third lens unit L3. X2 to X5 represent the movable range of the focus movement frame 4 (fourth lens unit L4), X2 represents the closest position of the fourth lens unit L4, and X5 represents the infinite position of the fourth lens unit L4. As shown in FIG. 5, the lens barrel of the present embodiment has a region where the mechanical movable ranges of the third lens unit L3 and the fourth lens unit L4 overlap each other, and the range is X2. ~ X4.

  As described above, the closest position of the fourth lens unit L4 is X2. For this reason, if the movable range of the fourth lens unit L4 is movable to the object side relative to the position X2, this means that the lens unit can focus on a closer subject. Since the movable range of the third lens unit L3 is a movable range determined when the optical specification is determined, it is a predetermined movable range. Therefore, if the mechanical movable range of the fourth lens unit L4 can be configured to be more overlapable with the third lens unit L3, it is possible to focus on a closer subject.

  Next, the details of the image stabilization unit 3 and the focus movement frame 4 that are configured to be able to overlap will be described with reference to FIGS. FIG. 6 is a configuration diagram of the lens barrel when the fourth lens unit L4 is viewed from the imaging surface side with the CCD holder removed. FIG. 7 is an exploded perspective view of the lens barrel in a state where the image stabilizing unit 3 and the focus moving frame 4 are inserted into the guide bar. 8 and 9 are cross-sectional views taken along the plane AA in FIG. 6, and FIG. 8 is a diagram when the third lens unit L3 and the fourth lens unit L4 are respectively located closest to the object side. 9 is a view when it is located closest to the imaging surface side. FIG. 10 is a cross-sectional view taken along the plane B-B in FIG. 6, and the third lens unit L3 and the fourth lens unit L4 are each located closest to the object side.

  First, the configuration of the image stabilization unit 3 will be described. As described above, the image stabilization unit 3 is configured to be movable in the optical axis direction by the stepping motor 301. At the same time, the image stabilization unit 3 is configured to be able to move the third lens unit L3 also in the direction perpendicular to the optical axis, and this configuration enables so-called camera shake correction.

  Reference numeral 313 denotes a third lens holding frame that holds the third lens unit L3. The third lens holding frame 313 is provided with two anti-vibration driving magnets 310 (second magnets) and a first yoke 311 for closing the magnetic path of the magnets 310. Reference numeral 314 denotes an anti-vibration base (second fixing member) serving as a base member of the anti-vibration unit 3. The anti-vibration base 314 is provided with a coil 309 (second coil) for anti-vibration driving and a second yoke 312 for closing the magnetic path of the magnet 310. When the coil 309 is energized, a driving force is generated in the magnet 310, and the third lens unit L3 is driven relative to the third lens holding frame 313 in the direction perpendicular to the optical axis.

  Two sets of the magnet 310, the first yoke 311, the second yoke 312, and the coil 309 are provided, and this portion constitutes a vibration-proof drive actuator section (second drive means). In FIG. 6, a pitch direction anti-vibration drive actuator unit is provided below the optical axis center LX, and a yaw direction anti-vibration drive actuator unit is provided on the right side. Thus, since two sets of anti-vibration drive actuator units are provided, the third lens unit L3 can be driven in any direction within a plane orthogonal to the optical axis.

  In addition, the coil 309 is soldered to the vibration-proof flexible cable 308 so as to be electrically conductive. The anti-vibration flexible cable 308 is fixed to a stopper provided in the rear barrel 6 and is connected to the anti-vibration unit 3 through a U-turn shape 308a provided in the lens barrel. The U-turn shape 308a is a shape for preventing the reaction force of the anti-vibration flex 308 from being applied to the anti-vibration unit 3 when the anti-vibration unit 3 moves in the optical axis direction.

  Next, the configuration of the focus movement frame 4 will be described. As described above, the focus moving frame 4 is configured to be movable in the optical axis direction by the voice coil motor. The coil 401 is soldered to the focus flex 406 so as to be electrically conductive. The focus flex 406 is fixed to the focus flex stop portion 601 provided in the rear lens barrel 6 and fixed to the focus moving frame 4 through a U-turn shape 406a provided in the lens barrel. The coil 401 is connected.

  The anti-vibration flex 308 and the focus flex 406 are provided at target positions with respect to the yaw direction anti-vibration drive actuator when the lens barrel is viewed from the optical axis direction. Further, the voice coil motor (focus movement frame driving unit) for driving the focus movement frame 4 has an optical axis for the pitch direction anti-vibration driving actuator unit when the lens barrel is viewed from the optical axis direction. It is provided at a target position with respect to the center. With such a configuration, the fourth lens unit L4 can be mechanically moved with respect to the third lens unit L3 without optimally arranging the actuator and the flex around the optical axis and without increasing the size of the lens barrel in the radial direction. The range is configured to allow more overlap. In particular, the pitch direction anti-vibration drive actuator unit overlaps with the voice coil motor for driving the focus moving frame in a plane orthogonal to the optical axis when the anti-vibration unit 3 is moved to the most imaging surface side (the overlap amount is , Represented by L3L4α in FIG. 9).

  Next, the arrangement of the vibration-proof drive magnet 310 and the focus drive magnet 402 in this embodiment will be described with reference to FIG. FIG. 11 is a view of the arrangement of the magnet 310 and the magnet 402 as viewed from the rear front of the lens barrel. The magnets 310 (pitch direction anti-vibration drive magnet 310P, yaw direction anti-vibration drive magnet 310Y) are arranged so as to have two different magnetic poles in the direction perpendicular to the optical axis (the direction of the paper in FIG. 11). The magnet 402 is disposed so as to have the same magnetic pole (the same magnetized surface) in the optical axis direction (direction orthogonal to the paper surface in FIG. 11).

  FIGS. 11A and 11B show the influence of magnetism on the image stabilization unit 3 when the magnet 310 has the same magnetizing specification and the magnet 402 is magnetized in the N or S pole. FIG. 11A shows a case where different magnetic poles are arranged on the side where the distance between the magnet 310 and the magnet 402 is short. At this time, forces FPa and FYa act between the pitch direction anti-vibration drive magnet 310P and the yaw direction anti-vibration drive magnet 310Y in the direction in which they are attracted to each other.

  On the other hand, FIG. 11B shows a case where the same magnetic pole (N pole in FIG. 11B) is arranged on the side where the distance between the magnet 310 and the magnet 402 is short. As described above, the magnet 402 and the magnet 310 are arranged such that the first magnetic flux line formed by the magnet 402 and the second magnetic flux line formed by the magnet 310 repel each other when viewed from the optical axis direction. At this time, the forces FPb and FYb act between the pitch direction anti-vibration drive magnet 310P and the yaw direction anti-vibration drive magnet 310Y in directions that repel each other.

  In the lens barrel of this embodiment, the image stabilization unit 3 is configured to be movable in the optical axis direction. For this reason, the focus driving magnet 402 is fixed to the CCD holder 7, but the position of the anti-vibration driving magnet 310 changes in the optical axis direction, and the influence of the mutual magnetism on the magnet 310 in the optical axis direction changes. It changes according to the position. For this reason, when the image stabilization unit 3 moves in the optical axis direction during zoom shooting, the magnetic force formed with the magnet 402 changes to cause a roll behavior, which causes problems such as displacement of the zoom center and image skipping. Arise.

  In the arrangement shown in FIG. 11A, the vibration-proof drive magnet 310 and the focus drive magnet 402 are in a magnetically attracting relationship. At this time, since the distance between the magnet 310 and the magnet 402 becomes closer as the image stabilization unit 3 moves to the imaging surface side, the attractive force is accelerated in an accelerated manner. On the other hand, in the arrangement shown in FIG. 11B, the magnet 310 and the magnet 402 are magnetically repulsive.

  As described above, when the second driving unit (the coil 309 and the magnet 310) drives the third lens unit L3 from the telephoto side (TELE side) to the wide angle side (WIDE side), the magnet 310 approaches the magnet 402. Rotates with roll behavior. In this embodiment, in order to suppress such an operation, the magnet 402 and the magnet 310 are arranged such that the first magnetic flux line and the second magnetic flux line repel each other in the rotation direction of the magnet 310. Thus, in the case of the arrangement shown in FIG. 11B, the influence of the magnetic force generated during the image stabilization drive is smaller than that in the case of the arrangement shown in FIG. This is because, in the case of repulsive force, generally, the magnetic field lines are greatly distorted and leaked compared to the adsorption (suction) between different poles, and the efficiency is reduced. The repulsive force is about 50 to 70% of the attractive force. It is because it becomes the power of.

  As described above, by arranging the magnetic poles in the direction in which the anti-vibration driving magnet and the focus driving magnet are repelled, magnetic interference can be reduced while suppressing an increase in the size of the lens barrel and the optical device. For this reason, it is possible to provide a small lens barrel and an optical device that reduce magnetic interference between magnets that drive the vibration-proof lens and the focus lens.

  Although preferable embodiment of this invention was described, this invention is not limited to these embodiment, A various deformation | transformation and change are possible within the range of the summary.

3 Anti-Vibration Unit 4 Focus Movement Frame 310, 402 Magnet L3 Third Lens Unit L4 Fourth Lens Unit

Claims (4)

A focus moving frame for holding a first lens movable in the optical axis direction;
An anti-vibration unit holding a second lens movable in the optical axis direction and a direction orthogonal to the optical axis direction;
First driving means for driving the first lens, comprising a first coil provided on the focus moving frame and a first magnet provided on a first fixing member;
A second coil provided on the second fixing member and a second magnet provided on the image stabilization unit, and having a second driving means for driving the second lens,
The first magnet is arranged to have the same magnetic pole in the optical axis direction,
The second magnet is arranged to have two different magnetic poles in a direction orthogonal to the optical axis direction,
The first magnet and the second magnet have a first magnetic flux line formed by the first magnet and a second magnetic flux line formed by the second magnet repel each other when viewed from the optical axis direction. A lens barrel characterized by being arranged. When the second driving means drives the second lens from the telephoto side to the wide angle side, the second magnet rotates by causing a roll behavior by approaching the first magnet,
The first magnet and the second magnet are arranged such that the first magnetic flux line and the second magnetic flux line repel each other in the rotation direction of the second magnet. The lens barrel described.   The lens barrel according to claim 1, wherein the first lens and the second lens are arranged adjacent to each other in the optical axis direction.   An optical apparatus comprising the lens barrel according to any one of claims 1 to 3.