Abstract: A lens drive device includes a lens movable body provided with a lens and a drive mechanism for moving the lens movable body from a home position in an optical axis direction of the lens. The drive mechanism includes a magnet and a plurality of coils which is disposed so that the magnet is interposed in the optical axis direction of the lens. An electric current is supplied to the plurality of the coils in a reverse direction to a direction of an electric current, which is supplied to the plurality of the coils for moving the lens movable body, for restricting movement from the home position of the lens movable body. Therefore, swinging and rattling are hard to occur in the lens movable body and thus its impact resistance can be enhanced.

Abstract: In a lens holder included in an objective lens actuator, a first holding hole to hold a first objective lens and a second holding hole to hold a second objective lens are arranged. In the first holding hole, two supporting portions to support the first objective lens are arranged and they are disposed oppositely in a radial direction to sandwich an optical axis of the first objective lens. In the second holding hole, two supporting portions to support the second objective lens are arranged and they are disposed oppositely in a tangential direction to sandwich an optical axis of the second objective lens.

Abstract: A device for adjusting optical elements, in particular, for X-ray analysis, comprising a holding device (2) for receiving the optical element and at least two adjusting units at least one of the two longitudinal ends of the holding device (2), wherein the adjusting units each comprise one plunger (6, 6a, 6b, 6c, 6d), characterized in that each adjusting unit comprises a rotatably disposed adjusting ring (4, 4a, 4b, 4c, 4d) with an eccentric recess, and the optical element is mechanically coupled to the inner surfaces (7) of the adjusting rings (4, 4a, 4b, 4c, 4d) via the plungers (6, 6a, 6b, 6c, 6d). The adjusting device is compact, can be flexibly used and provides simple adjustment of the optical element.

Abstract: Disclosed herein is a lens shift mechanism which enables vertical movement of a lens attached to a first member by attaching the first member to a second stationary member so as to be vertically movable with respect to the second member, including: N (an integer of three or more) attachment shafts having a plurality of ball bearings and attached to the first member; and the second member bored with N longitudinal holes located at respective positions corresponding to attachment positions of the N attachment shafts on the first member, each of the N longitudinal holes having a vertical length not shorter than a vertical travel range of the first member.

Abstract: A method for aligning the upper and lower centering bells of a lens doublet assembly machine is provided. In one example of the method, the method includes positioning an alignment tool with respect to a base plate of the lens doublet aligning apparatus; positioning an upper bell shaft with respect to the alignment tool, wherein the upper bell shaft includes an upper bell chuck at a lower end of the upper bell shaft; and tightening flexural bearings around an outer radial edge of the upper bell shaft, wherein the flexural bearings precisely hold the upper bell shaft into perpendicular alignment in the lens doublet aligning apparatus.

Abstract: There is provided a zoom lens unit excellent in shock resistance and space-saving. Second, third lens holders 29, 30 have shaft holes, into which shafts 27, 28 are inserted, so as to be movable in an optical axis direction. By first, second helical springs 31, 32 fitted to the shafts 27, 28, the second lens holder 29 is biased to a wall member 18 provided on a subject side, and the third lens holder 30 is biased to a wall member 19 provided on an image pickup element 12 side. As the power is turned off, the second lens holder 29 moves toward the subject side and, upon contact with the wall member 18, is stopped, while the third lens holder 30 moves toward the image pickup element 12 side and, upon contact with the wall member 19, is stopped.

Abstract: Disclosed herein is a camera module including: a camera body including a lens-barrel holding a shooting optical system, a substrate attached to the lens-barrel, an image pickup device incorporated in the lens-barrel and operative to pick up an image of an object focused by the shooting optical system and to output an image pickup signal, and a signal processing unit provided on the substrate and operative to receive the image pickup signal outputted from the image pickup device and to perform a predetermined signal processing; and a shield case covering the lens-barrel and the substrate and operative to provide electromagnetic shielding for the image pickup device and the signal processing unit.

Abstract: In a lens barrel in which an imaging optical system can be retracted and protruded, a retaining member to retain an optical element nearest to the imaging element among the imaging optical system is provided, the optical element moves in a receding direction from the imaging element when the imaging optical system is protruded, and moves in an approaching direction to the imaging element when the imaging optical system is retracted by deforming the retaining member.

Abstract: The present invention relates to a lens barrel device including supporting means for supporting at least two optical parts holding frames holding optical parts so that the at least two optical parts holding frames can linearly move in the optical axis directions, respectively, and an image capture device.

Abstract: A method and system for aligning a spatial light modulator with respect to an imaging device is disclosed. An image of the spatial light modulator can be formed upon the imaging device and a controller can be used to position optical elements in a manner that effects translation, rotation, and scaling of the image so as to provide desired alignment. Such alignment can, for example, facilitate enhanced wavefront correction so as to at least partially compensate for the detrimental effects of atmospheric distortion in such applications as optical communications, imaging, and weaponry.

Abstract: There is provided a lens barrel including a lens barrel body for fixably and/or movably supporting a plurality of lenses, lens holding members for holding one of the plurality of lenses, and an alignment device for aligning the lens holding members such that optical axes approximately agree with an optical axis of one of the lenses. In this lens barrel, the alignment device includes at least three supporting portions such that the attitudes of the lens holding members may be changed, at least one of the three supporting portions includes a spherical convex portion provided on one of the lens holding members and the lens barrel body, and a spherical concave portion provided on the other of the lens holding members and the lens barrel body, and at least one of the remaining supporting portions can adjust a distance between the lens holding members and the lens barrel body.

Abstract: An apparatus for manipulating a camera lens includes a frame (32), a driving rod (34), a linking rod (36), and a driven rod (38). A guiding member (40) is formed on a side surface of the frame including a through hole (400) defined therein. One end of the driving rod pivotedly connected to the frame. One end of the linking rod is pivotedly connected to the other end of the driving rod. The driven rod extends through the through hole of the guiding member. One end of the driven rod is pivotedly connected to the other end of the linking rod, and the other end includes a lens-holder configured for holding the lens.

Abstract: A focus adjusting mechanism (50) for use in a portable electronic device (100) with a lens module (40) is provided. The lens module includes a lens barrel (42) and a lens barrel holder (44). The lens barrel is threaded into the barrel holder. The focus adjusting mechanism includes a driving member (52), a follower (54) and a transmission rod (56). The driving member has a plurality of circumferential teeth (5242) formed thereon. The follower has a plurality of linear teeth (5472) formed thereon. The linear teeth engage with the circumferential teeth for transforming the rotation of the driving member to the linear movement of the follower. The transmission rod is disposed between the follower and the lens barrel to transform the linear movement of the follower into the rotation movement of the lens barrel relative to the lens barrel holder.

Abstract: A focus driving apparatus with impact resistance is provided, including a lens carrier seat, a fixed base, a hanging element set, and a shake-resistant element set. The lens carrier seat is for carrying a lens. The hanging element set further includes a plurality of metal wires. The shake-resistant element set includes at least a soft resilient plate. One end of the metal wires of hanging element set is fixed to the lens carrier seat, and the other end penetrates the holes on the soft and resilient plate on the fixed base and is fixed to the shake-resistant element set. The shake-resistant element set can absorb the external impact force by deformation to provide protection to the hanging element set and lens carrier seat.

Abstract: A driving system for driving an optical element in a first direction includes a linear actuator for producing a displacement in a second direction perpendicular to the first direction, a displacement picking unit being extendable in a third direction, perpendicular to both of the first and second directions, for picking out a displacement of the linear actuator, and a direction converting unit disposed at the third-direction side of the linear actuator, for converting a direction of the displacement picked out by the displacement picking unit.

Abstract: A piezoelectric-driving optical lens module is disclosed, including a lens body a piezoelectric actuator for providing a driving force, and a position sensor for detecting position variations. The lens body includes at least a hollow base body, a lens barrel exhibiting axial freedom of movement positioned inside the hollow base body, and a lens set disposed inside the lens barrel. The lens barrel is driven by a piezoelectric actuator to move the lens set along the optical axis to achieve the optical functions of zooming and focusing. The position sensor is configured to detect the axial position of the lens barrel with respect to the hollow base body, thereby providing a simple structure to improve on the drawbacks of prior techniques.

Abstract: A lens body tube comprising: a projection lens; a rotary cam tube that moves a variable power lens within the projection lens in an optical axis direction in accordance with a rotation of the rotary cam tube; a supporting tube, provided at an outside of the rotary cam tube, that rotatably supports the rotary cam tube; a zooming tube, rotatably provided at an outside of the supporting tube, that rotatably supports the supporting tube and rotates the rotary cam tube in accordance with a rotation of the zooming tube; a cam gear provided at an outer peripheral surface of the rotary cam tube; a zoom gear provided at an inner peripheral surface of the zooming tube; a relay gear that is rotatably provided between the rotary cam tube and the zooming tube, and meshes with the cam gear and the zoom gear to transmit a rotation movement of the zooming tube to the rotary cam tube; an insertion hole which is formed at the supporting tube and in which the relay gear is inserted; and a supporting portion, provided at the sup

Abstract: A lens frame is contained in a lower lens barrel and moves in a direction of an optical axis as guided by a guide shaft. An adjusting lever is provided with a lever body having a bearing for supporting the lower end of the guide shaft and an opening into which an adjusting pin is inserted, and a holding portion extended from near the opening of the lever body to outside the lower lens barrel. A length between an edge of the holding portion and a center of the opening is longer than the length between the center of the opening and a center of the bearing. The lever moves around the adjusting pin in a plane orthogonal to the optical axis to adjust the position of the guide shaft.

Abstract: In an apparatus for mounting two or more optical elements that are each held in an individual mount or in a support structure, said optical elements are mounted in a common mount. The relative positioning of the optical elements (10, 11) in the common mount (18) can be set.

Abstract: An auto-focus lens module that uses electromagnetic force as well as spring force as driving force to control movement of the lens for auto-focusing consists of a rectangular base, two copper plates, an insulation spacer, four magnets, a lens holder, a lens, a coil, a spring, and a rectangular top cover. The lens holder, the lens and the coil form a lens set. The spring is sleeved outside the coil and is elastically supporting between the outer circular flange and the top cover while the four magnets are respectively located outside the spring, on four corners of the rectangular case. Thus the components of the lens module according to the present invention are simplified, the volume of the device is minimized, and the lens holder moves stably for focusing.

Abstract: A sight includes a housing with first and second openings, and includes an optics section that is disposed within the housing, that has image erecting optics and eyepiece optics, and that optically influences radiation received through the first opening from a scene, so as to deliver through the second opening a viewable image that is a function of the radiation. An adjusting section facilitates adjustment of the position of the image erecting optics and the eyepiece optics within the housing.

Abstract: A fine adjustment mechanism includes a first frame, a carrying portion and a first connecting portion. The first frame has a first opening. The carrying portion is adapted to assemble outside an optical element for fixing it. The carrying portion has a carrying plate disposed in the first opening and extends from the first opening towards a side of the first frame. The first connecting portion is located in the first opening and connected between the carrying plate and the first frame. The first connecting portion is capable of generating an elastic torsion around the axis in a first direction. By using the theorem of elastic torsion, the present invention makes the carrying portion rotate around the axis of the first connecting portion only and is able to avoid the offset problem occurred at the intersection of the axes of the carrying portion and the first connecting portion during adjusting.

Abstract: A refractive optical unit is provided and has a regulator mechanism that can easily align between a lens of a lens group to be fixed in a housing and a lens of a lens group freely moving along the optical axis at their lens centers, by operation. In a lens holder for the lens group to be fixed in the housing, an operation piece is provided that protrudes outward through an opening of the housing. Furthermore, an elongate hole is provided in a position opposite to the operation piece with reference to a third lens group as viewed from the operation piece side. A guide rod is inserted through the elongate hole so that the lens holder can be parallel moved along the lengthwise of the elongate hole or rotated about the guide rod on a plane orthogonal to the optical axis, thereby aligning a lens of the lens group with a lens of another lens group at its centers.

Abstract: In a lens system assembling method, the spacing between two mutually opposing lenses are set more accurately. The method includes the steps of: holding a first lens with a lens holding member, with the opposing lens face of the first lens being brought into close contact with a first receiving face of a spacing jig, and a lens receiving face of the lens holding member being brought into close contact with a second receiving face of the spacing jig; removing the spacing jig from the first lens and the lens holding member holding the first lens; and setting the spacing between the mutually opposing first and second lenses at a predetermined distance by abutting the second lens to the lens receiving face of the lens holding member such that the opposing lens face of the second lens is brought into close contact with the lens receiving face.

Abstract: A lens barrel in which a plurality of movable units, each including a group of lenses, are moved in the optical axis direction when a cam ring is rotated relative to a stationary ring around the optical axis, is disclosed. The lens barrel includes a first movable unit including a first group of lenses and a first moving frame having a roller support hole formed therein; a second movable unit including a second group of lenses and a second moving frame disposed inside the first moving frame; a pressing roller supported in the roller support hole in the first moving frame; a biasing spring attached to the outer surface of the first moving frame; and a receive roller supported by the first or second moving frame.

Abstract: A lens actuating apparatus includes a fixed part, a moving part and at least one flexible part. The moving part is movably located on the fixed part. The flexible part has four contacting portions that form a hollow enclosed body. Two contacting portions that are located at the diagonal direction fasten the fixing part, and the other two contacting portions that are located at another diagonal direction contact the moving part. When the moving part has a movement related to the fixed part, the contacting portions of the flexible part contacted the moving part move far away from the fixed part. Thereby, the moved contacting portions exert a flexible recovery force to the moving part. The flexible part can be fully utilized in a limited space and does not affect the allocation of the other elements.

Abstract: An optical axis tilting device of a laser optical system, includes a lens barrel inside of which provided with a laser optical system; a tilt frame supported at the lens barrel; a tilt sensor which is provided at the tilt frame and is configured to detect a preset reference position of the tilt frame; a fixed frame fixed to the lens barrel and provided with a tilting mechanism which tilts the tilt frame relative to a horizontal plane; a leveling mechanism which supports the lens barrel tiltably, and tilts the lens barrel so as to detect the reference position by the tilt sensor and then levels the tilt frame; a feed screw which is rotatably driven by a driving motor; a feed piece which is reciprocated by the feed screw and engages with the tilt frame and tilts the tilt frame relative to the reference position; a piece position detection device configured to detect a position of the feed piece; and a computing device configured to calculate a tilting angle based on the position of the feed piece detected by th

Abstract: A arrangement serves for the adjustment of an optical element (1), in particular of a lens in an optical system, in particular in a projection lens system for semiconductor lithography. The optical element (1) is mounted in a mount (3) by means of a number of bearing feet (2) distributed over the circumference of the optical element (1) and is selectively deformable by actuators (5). At least some of the bearing feet (2) are engaged by the actuators (5) in a region of the respective bearing foot (2) in such a way that the respective bearing foot (2) can be displaced in the direction of the optical axis (7).

Abstract: An optical unit is transitional between a first mode for shooting and a second mode for non-shooting, and a supporting unit and a driving unit are located within a cylinder for substantially containing a tilting unit to be disposed about an optical axis as a center while are arranged so as to move together with a movable group and to avoid an imager and the retaining unit viewed from the optical axial direction.

Abstract: The optical scanning apparatus has a first light source, a second light source disposed in a side-by-side relationship with the first light source in a sub-scanning direction, a deflector deflecting respectively a first light beam outgoing from the first light source and a second light beam outgoing from the second light source, and scanning over different scanned surfaces with the light beams, a first optical member provided in a first optical path between the first light source and the deflector, wherein the first light beam outgoing from the first light source passes through, a second optical member provided in a second optical path between the second light source and the deflector, wherein the second light beam outgoing from the second light source passes through, disposed beside the first optical member in the sub-scanning direction, the second optical member having the same optical characteristic as the first optical member, a holding member that holds a side face of the optical member and a side face o

Abstract: A camera system incorporating a seamless lens-drive switching mechanism includes a lens drive ring, a manual operation ring, a motor, a first one-way rotational transfer mechanism preventing the manual operation ring and the lens drive ring from being connected with each other in a first neutral state, and maintains the first neutral state even if the lens drive ring is rotated by the motor; a second one-way rotational transfer mechanism which prevents the motor and the lens drive ring connecting with each other in a second neutral state, connects the motor with the lens drive ring when the motor rotates from the second neutral state, and maintains the second neutral state even if the lens drive ring is rotated by the manual operation ring; and a controller which stops and reverses the motor to bring the second one-way rotational transfer mechanism into the second neutral state.

Abstract: An optical subassembly with an optical element, for example a mirror element (7), has an optical surface (9) and bearing points (12) arranged on the circumference. The optical element (7) is connected to a mount (13) at the bearing points (12) via connecting elements (14, 15, 16, 17, 18). Stress-decoupling cutouts, for example curved slots (11), are provided between the optical surface (9) and the bearing points (12).

Abstract: A camera having a lens barrel housed therein includes a reflection optical member for reflecting a light beam incident along a first optical axis (O1) from a subject so as to reflect the light beam toward a second optical axis (O2) intersecting the first optical axis; a light-quantity adjusting member for adjusting the quantity of incident light from the subject; and a drive source for displacing the light-quantity adjusting member, in which by displacing the light-quantity adjusting member, the quantity of the incident light from the subject can be adjusted, and the light-quantity adjusting member is displaced in a direction substantially perpendicular to an optical axial plane inclusive of the first optical axis and the second optical axis so as to adjust the light-quantity.

Abstract: An objective lens comprises a housing, an iris diaphragm and a plurality of lens groups. For focusing the objective lens while minimizing the variation of the image angle at least two lens groups are adapted to be moved relative to the housing. The one lens group is arranged in front of the iris diaphragm. The other lens group is arranged at least partially behind the iris diaphragm.

Abstract: A lens driving device which can improve the positional accuracy of a moving lens while realizing a low component count and saving space. In the lens driving device provided in a lens barrel, a lens moves along the optical axis. A guide shaft is fixed to a lens barrel case and has a male thread portion formed along the optical axis. A rotor, which is driven by a motor, has a female thread portion that is to be threadably engaged with the male thread portion. A lens holder holds the lens and moves the lens along the optical axis in response to rotation of the rotor. An urging spring urges the lens holding member onto the rotary member.

Abstract: A motor structure with a built-in lens includes a lens mount (10), a motor (30) received in the lens mount, and a lens unit (50) received in the lens mount. The lens unit is drove by the motor to telescopically move along an axial thereof when a rotor (34) of the motor is rotated. A guiding member (70) arranged on an end of the motor for preventing an axial movement of the motor. The guiding member includes at least a leg (78) extending along an axial direction therefrom for guiding the axial movement of the lens unit.

Abstract: There are provided a lens barrel unit and an imaging apparatus in which a plurality of constituent elements can be driven using a linear driving mechanism.

Abstract: A lens driving device includes a moving body having a lens and a drive magnet that is moveable with the lens in an optical axis direction of the lens, and a fixed body that moveably supports the moving body in the optical axis direction. The fixed body includes a first drive coil and a second drive coil that are disposed in the optical axis direction and form magnetic circuits with the drive magnet, and a first magnetic member and a second magnetic member that are disposed opposite the first drive coil and the second drive coil, respectively. The moving body is retained at a first position by magnetic attraction working between the drive magnet and the first magnetic member when energization of the first drive coil is stopped. The moving body is also retained at a second position by magnetic attraction working between the drive magnet and the second magnetic member when energization of the second drive coil is stopped.

Abstract: A lens barrel includes a) a plurality of lens groups each having at least one lens, b) a plurality of lens retaining frames, including a retractable lens retaining frame, c) lens retaining frame driving devices, d) a main-guide shaft member in parallel to the optical axis to support the retractable lens retaining frame rotatably in longitudinal and circumferential directions of the main-guide shaft member, and e) a sub-guide shaft member to guide the retractable lens retaining frame along the optical axis and to allow the retractable lens retaining frame to be retracted toward the retracted position at a retracting point on the main-guide shaft member and to guide the retractable lens retaining frame on the main-guide shaft member along the optical axis at other than the retracting point.

Abstract: A lens barrel capable of forming high-accuracy barrel body and simply adjusting a tilt and a position in an optical axis direction without using dedicated portions is provided. The lens barrel includes a front barrel and a rear barrel. An inner diameter of a portion, containing a focus lens of the front barrel, is 1.15 times or more as large as an inner diameter of a portion containing a zoom lens of the rear barrel. The rear barrel and the front barrel are coupled by a coupling screw. A convex portion has an adjustment face for adjusting a distance between the focus lens and the zoom lens and is formed on a coupling face of the front barrel. A convex portion includes a reference face serving as a reception portion and is formed on the rear barrel.

Abstract: A camera module of the present invention includes a plurality of projections 61b on a bottom base of a driving section 61 of an AF/Zoom module. The projections 61b are radially extended from an aperture 63 formed on an optical path. By this, adhesive can be spread over the projections 61b when bonding a lens holder and the AF/Zoom module together. Furthermore, even if the adhesive is excessively applied, excessive adhesive can be retained between the projections 61b. As a result, it is possible to realize a solid-state imaging device which makes it possible to improve adhesive strength between the lens holder and the AF/Zoom module and easily bond the lens holder and the AF/Zoom module.

Abstract: This invention relates to a variable focal length lens system including a deformable lens and a piezoelectric device surrounding the deformable lens. The piezoelectric device is configured for exerting a radial inward or outward force to the deformable lens so as to deform the deformable lens, thereby changing a focal length thereof.

Abstract: A lens device is provided and includes: a lens barrel body; a lens frame swingably attached to the lens barrel body; and a swing mechanism being adapted to swing the lens frame so that alignment of an optical axis of the lens device can be effected, the swing mechanism including: an elastic unit interposed between the lens barrel body and the lens frame, the elastic unit biasing the lens barrel body and the lens frame in directions away from each other or in directions nearing to each other; and an advancing and retracting unit disposed at three points in a circumferential direction defined by the lens barrel body and the lens frame, the advancing and retracting unit advancing or retracting the lens frame relative to the lens barrel body against a bias force of the elastic unit to swing the lens frame.

Abstract: The invention provides a lens transfer device including at least one lens and a lens barrel. The lens barrel has a lens receiving part with the lens arranged in an inner space thereof and an extension extending radially from an outer surface of the lens receiving part. An actuator has a body and an output member at a leading end of the actuator to contact the extension, and is adapted to expand/contract and bend in response to an external supply voltage to provide a driving force necessary for transfer of the lens barrel through the output member. A pressing member has a free end contacting a rear end of the actuator to force the actuator against the extension, and a guide guides the transfer of the lens barrel along an optical axis.

Abstract: A holding apparatus that holds an optical element above a base includes three holding units provided at different positions along an outer periphery of the optical element. Each holding unit includes a first member provided on the optical element, a second member provided on the base, a columnar third member extending in a direction perpendicular to both a tangential direction and a radial direction of the optical element, and a plate-shaped fourth member having a thickness in the radial direction of the optical element. The first member and the second member are connected to each other with the third member and the fourth member disposed therebetween.

Abstract: A lens assembly includes: a lens group including a plurality of lenses; and a lens holder accommodating the lens group and having an opening in each of a front end face of the lens holder and a rear end face of the lens holder. The opening of the front end face has a smaller diameter than an outer diameter of a foremost lens accommodated in a foremost end face side of the lens holder, the lens holder includes a spacer ring disposed on a rear side of a rearmost lens accommodated in a rearmost end face side of the lens holder, the spacer ring abutting on a peripheral portion of the rearmost lens to keep a space between a rear face of the rearmost lens and the rear end face of the lens holder, and the lens holder holds a rear face of the spacer ring by thermal caulking.

Abstract: An actuator includes a holder having a movement hole, a lens barrel which moves within the movement hole, and driving means for driving the lens barrel. Each of the driving means is provided with driving members composed of an artificial muscle. The lens barrel can be suitably moved within the movement hole by making the driving members perform a predetermined operation.

Abstract: The present invention is directed to a lens barrel that is simplified in structure with the reduced number of components and is facilitated in assembly and associated adjustment. The lens barrel enables an appropriate frictional force against the rotation force caused by manipulating rotary operation rings such as a zooming ring and a focusing ring to effect the optimum operating force on the rotary operation rings.

Abstract: An optical assembly includes a first tubular member having a pitched bearing surface proximate one end; a second tubular member having a pitched bearing surface proximate one end; a coupling tubular member fixedly coupled to the second tubular member and rotatably and slideably coupled to the first tubular member; and an optical element received in at least one of the first, the second or the coupling tubular members. At least a portion of the pitched bearing surface of the first tubular member is in engaging contact with at least a portion of the pitched bearing surface of the second tubular member. Rotating the first tubular member with respect to the second tubular member smoothly varies a distance between the first and second tubular members and allows a large, smooth adjustment with little effort. Rotation in a single direction returns the distances to an initial starting point.

Abstract: In a lens barrel, a flare diaphragm is disposed on an optical path of lenses or in the vicinity thereof such that the flare diaphragm can advance into and retreat from the optical path for cutting deleterious light corresponding to the lenses moving in the direction of the optical axis. This lens barrel can reliably cut deleterious light flux in a simple structure.