Abstract: An optical unit includes a movable body, a fixed body surrounding the movable body, a turning support mechanism turnably supporting the movable body with respect to the fixed body, and a drive mechanism including a coil disposed on the movable body or the fixed body, and multiple magnets disposed on the other of the movable body and the fixed body at a position facing the coil. An end part in an optical axis direction of the coil is bent in a direction approaching a turning axis of the movable body, and the magnets are disposed side by side so that faces of the magnets facing the coil become approximately parallel to the coil when viewed in a direction of the turning axis in comparison with a case that the magnets are arranged along the optical axis direction.

Abstract: A stage light fixture with an integrated lens holder includes a light head having a light source and a light-outgoing lens assembly, light emitted from the light source being projected through the light-outgoing lens assembly; and a support arm for supporting the light head to rotate. The light head is provided with a lens mounting ring for fastening the light-outgoing lens assembly, a support plate having a light-passing hole, and a plurality of support pillars for connecting the lens mounting ring to the support plate, which are integrally form the lens holder in an integrated form to accommodate a focusing assembly and/or an amplifying assembly. Compared to the lens holder formed by splicing metal plates, such integrated structure can reduce parts for assembly and reduce geometric tolerance due to multiple process flow, thereby achieving improved assembly accuracy. Meanwhile, the integrated lens holder can strengthen the whole strength thereof.

Abstract: A lens unit includes a guided portion that includes a first bearing portion and a second bearing portion disposed to be spaced apart from each other in a direction X and is slidably supported by a guide shaft, and a lens holding member. The lens unit includes a first tilt-preventing member having a linear expansion coefficient lower than a linear expansion coefficient of the lens holding member. The first tilt-preventing member is fixed to a region of the guided portion positioned between the first bearing portion and second bearing portion.

Abstract: A lens barrel includes: a first lens; a first tube that holds the first lens and moves along an optical axis; a focusing lens; an actuator that drives the focusing lens; and a second tube that holds the focusing lens and the actuator and moves along the optical axis.

Abstract: An optical system is provided. The optical system includes a first optical module and a second optical module. The first optical module includes a movable portion, a fixed portion and a driving assembly. The movable portion is connected to a first optical member, and is movable relative to the fixed portion. The driving assembly is configured to drive the movable portion to move relative to the fixed portion. The second optical module is connected to a second optical member, wherein an optical axis passes through the first optical member and the second optical member.

Abstract: A lens apparatus includes an urging member disposed between first and second lens holding members, a first guide member including a first receiver configured to receive the urging member, and a first guide protrusion extending in an optical axis direction from the first receiver toward the second lens holding member, and a second guide member including a second receiver configured to receive the urging member; and a second guide protrusion extending in the optical axis direction from the second receiver toward the first lens holding member. The first and second guide protrusions have areas that always overlap each other in the optical axis direction in a use state. When the first and second lens holding members are closer to each other than a predetermined state, at least part of the first and second guide protrusions protrudes from the first or second receiver.

Abstract: A lens unit includes a guided portion that includes a first bearing portion and a second bearing portion disposed to be spaced apart from each other in a direction X and is slidably supported by a guide shaft, and a lens holding member. A first distance between the center of a fixing portion of the lens holding member and the center of the first bearing portion in the direction X is set to be longer than a second distance between the center of the fixing portion and the center of the second bearing portion in the direction X. A first tilt-preventing member having a linear expansion coefficient lower than that of the lens holding member is fixed to a region, which is closer to the first bearing portion than the center of the fixing portion, of a portion of the guided portion positioned between the first and second bearing portions.

Abstract: The present embodiment relates to a light output module comprising: a first lens part including at least one lens; a second lens part including at least one lens and disposed at a lower side of the first lens part; an actuator for moving the second lens part; a third lens part disposed at a lower side of the second lens part; and a light source disposed at a lower side of the third lens part, wherein the actuator comprises: a first housing receiving the second lens part and including at least one first magnet disposed therein; a second housing receiving the first housing and including at least one second magnet disposed therein; and a third housing including a first coil facing the first magnet and a second coil facing the second magnet, wherein the first housing is operated in a first direction, and the first housing and the second housing are operated in a second direction.

Abstract: A cam follower for a zoom lens is optimized for reduced damages to a zoom lens, for example if the zoom lens experiences an impact.

Abstract: A lens module includes a carrier, a framework, and an optical lens disposed on the framework. The carrier has an inner surface including a contact surface. The framework contacts the contact surface and is configured with a guiding lever disposed in a guiding recess formed across the inner surface. When the guiding lever is moved in the guiding recess, the framework is rotated on the carrier about an optical axis, and the framework and the optical are moved on the carrier along the optical axis. A projection apparatus includes an illumination system, a light valve, and a projection lens, and the illumination system includes the lens module. The lens module and the projection apparatus may be used to adjust the focusing position of the light beam passing through the optical lens to a proper position, and improve the projection quality of the projection apparatus.

Abstract: A lens barrel includes: a first lens; a first tube that holds the first lens and moves along an optical axis; a focusing lens; an actuator that drives the focusing lens; and a second tube that holds the focusing lens and the actuator and moves along the optical axis.

Abstract: A lens barrel includes a lens frame unit movable along an optical axis, a guide pole configured to guide the lens frame unit along the optical axis of the lens frame unit, a first lens frame holding one end of the guide pole, a guide cover held by the first lens frame, and a fastening member fastening the guide cover to the first lens frame. The guide cover includes a protruding part holding the other end of the guide pole, and protruding along the optical axis. The fastening member fastens the guide cover to the first lens frame through the protruding part.

Abstract: A lens barrel that prevents an oscillation phenomenon caused by vibrations occurring when a lens of an image blur correction mechanism shifts. A first cylinder is engaged in the cam cylinder and caused to move in a direction of an optical axis by rotation of a cam cylinder. A second cylinder supports a lens holding member, which moves in a direction different from a direction of an optical axis so as to correct for an image blur, and is engaged in the cam cylinder and caused to move in the direction of the optical axis by rotation of the cam cylinder. The second cylinder has a first vibration isolation pin that is engaged with the first cylinder movably in the direction of the optical axis.

Abstract: A projection lens includes a lens group holding tube including lenses on the side facing the inner circumference of the lens group holding tube, a cam tube that supports the lens group holding tube movably in the optical axis direction, and a guide tube that supports the cam tube rotatably around the optical axis. The lens group holding tube includes a guide pin that protrudes outward from the lens group holding tube. The cam tube has a cam hole which inclines with respect to the optical axis direction along the circumferential direction and through which the guide pin passes. The guide tube includes a guide groove which extends in the optical axis direction and into which the guide pin is so inserted as to pass through the inner circumference of the guide groove and a flange that protrudes outward.

Abstract: A lens barrel includes at least one lens, the optical axis of the lens; the first frame (the fixed frame 900) having the first restricting portion (901, 902) and having an approximately cylindrical shape about the optical axis; the second frame (1000) having the cam groove (1036) and having an approximately cylindrical shape about the optical axis; the third frame (510) having the guide portion (511) which restricts inclination thereof with respect to the first contact portion (514) and the optical axis and having an approximately cylindrical shape about the optical axis; the drive arm (520) having a cam follower (523), the second restricting portion (524, 525) and the second contact portion (526), and having an approximately arcuate shape constituted of a portion of a circular cylinder about the optical axis or an approximately plate shape; the guide shaft (601) for guiding the guide in a movable manner in the optical axis direction; and the spring (603).

Abstract: A blade housing assembly for a power operated rotary knife including a split blade housing and a cam mechanism for changing a blade housing diameter between blade supporting and blade changing positions. The split blade housing includes an annular blade support section, a mounting section and a split extending through the mounting section and an inner wall of the blade support section and defining a split distance between first and second circumferential ends of the inner wall. The split includes a radial split section and an angled split section adjacent the inner wall. The mounting section includes first and second body portions on opposite sides of the split. The cam mechanism includes a cam plate bridging the first and second body portions and a cam member rotatably supported by the cam plate. The cam member is rotatable between closed and open positions to change the blade housing diameter.

Abstract: A lens barrel 2 includes an optical system including a first lens unit held by a first holder and a second lens unit held by a second holder. The lens barrel 2 includes a first cam barrel 22 to be driven rotatably about an optical axis of the optical system in zooming, a second cam barrel 29 to be driven in an optical axis direction of the optical system in synchronization with the first cam barrel 22, and a third cam barrel 28 to be driven in the optical axis direction in synchronization with the first cam barrel 22 and driven rotatably about the optical axis in focusing. The second cam barrel 29 is provided with a first linear movement groove and a first cam groove. The third cam barrel 28 is provided with a second cam groove and a second linear movement groove.

Abstract: An apparatus includes an adjustment knob, an inner locking ring, and an outer locking ring threadably coupled to the inner locking ring. The adjustment knob includes at least one tooth protruding radially inward from an inner peripheral edge of the adjustment knob. The inner locking ring includes at least one tooth protruding radially outward from the inner locking ring and configured to engage the at least one tooth of the adjustment knob to prevent rotational movement of the adjustment knob. The outer locking ring is configured to move the inner locking ring in a first axial direction toward the adjustment knob when the outer locking ring is rotated in a first rotatable direction. The outer locking ring is also configured to move the inner locking ring in an opposite second axial direction away from the adjustment knob when the outer locking ring is rotated in an opposite second rotatable direction.

Abstract: A feeding mechanism is used to adjust the distance between a reduction side lens group and an object plane for back focus adjustment. A rotation angle adjustment mechanism capable of rotating action independent of rotating action performed in the back focus adjustment is used to adjust the rotation angle by which at least part of the reduction side lens group is rotated.

Abstract: In a lens barrel and an imaging apparatus, improvement in impact resistance and size reduction can be enhanced. The lens barrel includes the following elements; a guide frame including a rotation restricting rib; a first group frame; and a second group frame. The first group frame includes a first guide part engaged outside the rotation restricting rib. The relative rotation of the first frame is restricted by the rotation restricting rib and the first group frame is capable of moving along the optical axis direction. The second group frame includes a second guide part engaged inside the rotation restricting rib. The relative rotation of the second frame is restricted by the rotation restricting rib and the second group frame is capable of moving along the optical axis direction. A cam pin is formed on the outer peripheral surface of the first group frame and engages a cam cylinder disposed on the outer periphery of the first group frame.

Abstract: There is provided a zoom lens including first and second lens groups independently movable in an optical axis direction in an optical system. Before and after switching between two modes different in minimum focusing distance, a lens group to rule focusing changes between the first and second lens groups or a relative position between the first and second lens groups changes.

Abstract: A zoom lens includes in order from an object side to an image side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power, and a fourth lens unit having a negative refractive power, and includes an aperture stop which is disposed between the second lens unit and the fourth lens unit, and the first lens unit includes a negative lens and a plurality of positive lenses, and at the time of zooming from a wide angle end to a telephoto end, a distance between the first lens unit and the second lens unit widens, a distance between the second lens unit and the third lens unit narrows, and a distance between the third lens unit and the fourth lens unit changes, and the zoom lens satisfies predetermined conditional expressions.

Abstract: A lens structure is provided. The lens structure comprises a first barrel and a second barrel. The first barrel comprises a first pin and a second pin. The second barrel comprises a continuous groove. Wherein in a wide-angle end, the first pin is located in the continuous groove and the second pin is located outside of the second barrel. Wherein in a telephoto end, the first pin is located outside of the second barrel and the second pin is located in the continuous groove.

Abstract: A microscope (10) includes an objective system (30) and a zoom system (32). The microscope (10) furthermore has a manually rotatable rotary wheel (108) for adjusting the magnification of the zoom system (32), the rotary wheel (108) being rotatable within a predetermined maximum rotation range. The rotary wheel (108) includes a first engagement element (162, 164). In addition, at least one second engagement element (130 to 136) is movably mounted on a housing (100) of the microscope (10). This second engagement element (130 to 136) is movable between a deactivated and an activated position, being in engagement with the first engagement element (162, 164) in an activated position. The position of the second engagement element (130 to 136) is determined by the respective objective (44, 52) currently received in the beam path.

Abstract: A method for generating a translation image includes first and second lenses capturing first and second images toward an object respectively, an image processing device calculating a depth of field of a pixel in the first image relative to the first lens according to a first vertical viewing angle between the pixel in the first image and the first lens, a second vertical viewing angle between a corresponding pixel in the second image and the second lens, and a distance between the first and second lenses, the image processing device calculating a horizontal viewing angle between the pixel in the first image and the first lens according to the depth of field, coordinates of the pixel in the first image, and the distance, and the image processing device generating a translation image according to the coordinates of the pixel, the depth of field, the distance, and the horizontal viewing angle.

Abstract: An imaging apparatus comprises an optical system that includes a plurality of lens groups, each lens group including one or more lenses, at least one of the lens groups being independently movable with respect to the other lens groups and including a focus lens group for focusing the subject and a lens control unit that controls movement of the plurality of lens groups to bring into focus based on a feeding position of the focus lens group.

Abstract: A lens barrel includes a support frame and a retracting lens frame. The support frame includes a main body portion, a first linking portion and a second linking portion. The first region is configured to dispose the second lens in the imaging enabled state. The second region is formed continuously with the first region. The first linking portion links the second region on one side of the main body portion in the optical axis direction. The second linking portion links the second region on the other side of the main body portion in the optical axis direction. The retracting lens frame is disposed between the first linking portion and the second linking portion in a housed state.

Abstract: A lens barrel in which tilt adjustment can be made depending on the position of a lens unit in the optical axis direction. This lens barrel includes: at least three guide bars provided so as to extend along the optical axis direction; a driving unit that respectively drives the at least three guide bars in the optical axis direction; a lens frame holding unit that holds an image-capturing lens, the lens frame holding unit being attached to at least three guide bars and being driven in the optical axis direction by the at least three guide bars; and a control unit that controls said at least three linear actuators so as to adjust the respective drive amounts in the optical axis direction of the at least three guide bars and to tilt the lens frame holding unit from a direction orthogonal to the optical axis.

Abstract: An arrangement for a monitoring camera device having a camera head being movable within a movement range (MR1, MR2) is provided. The arrangement comprises an enclosure for covering the interior of the monitoring camera device and having an opening for the camera head providing a free line of sight for an arbitrary camera head position within the movement range (MR1, MR2), a shield movably arranged relative the enclosure for masking parts of the opening not being used for providing the free line of sight for the arbitrary camera head position, the shield comprising a first and a second shield portion mutually movably arranged, wherein the shield is maneuverable between a compressed state and an extended state by movement of the first shield portion relative to the second shield portion. A monitoring camera device comprising the arrangement is further provided.

Abstract: A lens barrel includes: a fixed frame; a zoom ring rotatably held around an outer periphery of the fixed frame; a contact member; and a biasing member. The zoom ring has a first sliding surface to a fourth sliding surface. When the contact member moves on the first sliding surface, a first load is applied to the biasing member; when the contact member moves on the second sliding surface, a second load greater than the first load is applied to the biasing member; and when the contact member moves on the third sliding surface, a load which varies in a range from the first load to the second load is applied to the biasing member.

Abstract: An imaging device comprises an imaging optical system with a plurality of lenses, a focusing manipulation component, an imaging state switching manipulation component, and first, second, third, and fourth restrictors. The focusing manipulation component can be turned to change the focal position formed by the imaging optical system. The imaging state switching manipulation component can be turned to move lenses and switch between the first imaging state and the second imaging state. When the imaging state switching manipulation component is turned, the range over which the focusing manipulation component can be turned is switched from a first range that is restricted by first and second restrictors, to a second range that is restricted by third and fourth restrictors and that is at least partly shifted from the first range.

Abstract: Embodiments of a lens barrel may comprise an imaging optical system with a plurality of lenses, a cylindrical focusing manipulation component, a stationary frame, and a restrictor. The focusing manipulation component changes the focal position of the imaging optical system by turning operation around the optical axis of the imaging optical system and to set the distance up to a second imaging region that is at least partially different from a first imaging region, and to move at least some of the lenses of the imaging optical system to switch between first and second imaging states. The restrictor restricts the rotatable range of the focusing manipulation component. When the focusing manipulation component is turned, its rotatable range is switched from a first rotatable range to a second rotatable range.

Abstract: An axis adjustment device, which may adjust an optical axis mismatch of an optical device at a high precision, and may perform an axis adjustment operation, includes a holding member to hold an optical device, a support member to support the holding member so that the holding member moves within a facing surface, a first rotating member to hold the holding member and rotatably supported around a first point S1 formed at a surface facing the support member, and a second rotating member to hold the holding member and to be rotatably supported around a second point formed at the surface facing the support member. The holding member moves within the surface facing the support member due to a rotation of one of the first and second rotating members and in order to adjust a relative position in a direction orthogonal to an optical axis of the optical device.

Abstract: A lens barrel includes an optical system for forming an optical image of an object, a first tube for supporting at least one lens included in the optical system, and a second tube disposed inside or outside the first tube. The first tube includes first cam grooves in the side surface thereof on which the second tube is disposed. The second tube includes first cam followers that engage with the first cam grooves.

Abstract: A lens barrel of the present invention includes a first barrel member on which a first cam groove is formed and which is provided with a first cam follower, and a second barrel member on which a second cam follower to engage with first cam groove is formed, and which is provided with a second cam groove to engage with first cam follower, the second barrel member performing relative rotation and relative movement in an axis direction of the rotation with respect to the first barrel member.

Abstract: A variable magnification projection optical system includes, in order from a magnification conjugate side to a reduction conjugate side, a first lens group, a second lens group, a third lens group, a fourth lens group, a fifth lens group, a sixth lens group, and an optical stop which is arranged at any position from a front of a lens arranged closest to the magnification conjugate side in the fourth lens group to a front of a lens arranged closest to the magnification conjugate side in the fifth lens group, wherein the fourth lens group is configured to include, in order from the magnification conjugate side, two or more negative lenses and a positive lens, and wherein the following condition expressions (1), (2) and (3) are satisfied: |Et/ft|?10??(1) |EW/fW|?15??(2) 0.87?23?T/23WT?1.15??(3).

Abstract: An auto-focus device includes: a light projection lens unit that projects light emitted from a light source unit, on a projection target surface; a light receiving unit that receives a diffusely-reflected light from the projection target surface; a light receiving lens unit that guides the diffusely-reflected light to the light receiving unit; a calculating unit that calculates a focal distance to the projection target surface from the diffusely-reflected light; a first holding unit that holds the light source unit, the light projection lens unit, and the light receiving lens unit; a second holding unit that holds the light receiving unit, and is mounted on the first holding unit; and a pressing unit that presses the second holding unit against the first holding unit. The second holding unit is configured to be displaceable on a surface of the first holding unit along a groove portion formed thereon.

Abstract: A cam frame of a zoom lens is provided. The cam frame includes an end surface, a first cam groove including a first connecting portion, a second connecting portion and a zooming-collapsing operation portion connected between the first connecting portion and the second connecting portion, an introducing groove connecting the end surface and the first connecting portion, a second cam groove, and a first connecting groove connecting the second connecting portion and the second cam groove.

Abstract: A dust-proof assembly for the lens driving device is disclosed, including at least a ring-shaped element and at least a flexible element. The at least a ring-shaped element is disposed with a tiny gap surrounding a lens assembly. The at least a flexible element fixes the at least a ring-shaped element to a bottom. The dust-proof assembly is able to prevent external foreign objects, such as particles or dusts, from falling onto a sensor element.

Abstract: Provided is a lens barrel in which tilt adjustment can be made depending on the position of a lens unit in the optical axis direction. This lens barrel is characterized by comprising: at least three guide bars provided so as to extend along the optical axis direction; drive means that respectively drive said at least three guide bars in the optical axis direction; a lens frame holding unit that holds an image-capturing lens, the lens frame holding unit being attached to at least three guide bars and being driven in the optical axis direction by said at least three guide bars; and a control unit that controls said at least three linear actuators so as to adjust the respective drive amounts in the optical axis direction of said at least three guide bars and to tilt the lens frame holding unit from a direction orthogonal to the optical axis.

Abstract: The present lens barrel is provided with a cylindrical moving frame and a cylindrical cam frame disposed on the inner periphery of the moving frame. The cylindrical moving frame has a first cam follower and a second cam follower. The first cam follower projects radially from the inner peripheral surface or the outer peripheral surface. The second cam follower projects radially further from the top of the first cam follower. The cylindrical cam frame is disposed on the inner periphery or the outer periphery of the moving frame, and has a first cam and a second cam on the outer peripheral surface side or the inner peripheral surface side. The first cam engages with the first cam follower, and has a cam surface only on the image plane side in the optical axis direction. The second cam is formed on the bottom surface of the first cam, and engages with the second cam follower.

Abstract: A lens barrel of the present invention comprises: first and second guide shafts arranged parallel to an optical axis X and provided in one of adjacent lens holding frames; first and second guide receiving holes formed in another of the adjacent lens holding frames for allowing the first and second guide shafts to be inserted therethrough and guided by the first and second guide shafts respectively; a first urging means of urging the one and the another of the adjacent lens holding frames along the direction of the optical axis; and a second urging means to rotate another of the adjacent lens holding frames in a circumferential direction of the first guide shaft. The first guide receiving hole is guided by the first guide shaft at two positions that are spaced apart from each other in the direction of the optical axis.

Abstract: A lens barrel including a subject-side lens guided by guide bars. The lens barrel has a first guide shaft disposed within a cylindrical fixed cylinder and oriented axially along the fixed cylinder; a second guide shaft disposed outside the fixed cylinder and oriented axially; a first holding member that holds a first lens and moves along the first guide shaft; and a second holding member that holds a second lens positioned on a subject side of the first lens and moves along the second guide shaft.

Abstract: A rotary actuation mechanism for variable focus spectacles is disclosed. The spectacles include two variable focus lens units and a bridge therebetween. The actuation mechanism includes a rotary cam rotatably mounted on the bridge, a fingerwheel attached to the rotary cam to rotate it, a cam follower disposed in slidable contact with the peripheral surface of the rotary cam, and two elongated couplers pivotally mounted on the bridge. The peripheral surface of the rotary cam is spiral shaped to transfer the rotation of the rotary cam into a linear, or pivoting, motion of the cam follower. Each coupler has a proximate end in contact with or attached to the cam follower and a distal end coupled to a linkage anchor of a respective lens unit, to transfer the motion of the cam follower into simultaneous pivoting motions of the linkage anchors thereby adjusting the focal lengths of the lens units.

Abstract: A lens barrel comprises a first frame, a barrier mechanism, and a second frame. The barrier mechanism is fixed to the first frame and blocks an opening. The second frame uses a cam mechanism to guide the first frame in the optical axis direction. The second frame has a cylindrical cam mechanism part that constitutes a cam mechanism. The cam mechanism part is provided with a thin-wall part that is partially thinner in the radial direction. A fixing portion of the barrier mechanism goes into spaces between the thin-wall part and the first frame.

Abstract: A lens barrel includes a cam follower, a first cam ring with a cam slide protrusion in which a cam groove engages with the cam follower, a second cam ring so supported by the first cam ring that both are unrotatable around an axis parallel to an optical axis, a rectilinear guide ring so supported by the second cam ring that the second cam and rectilinear guide rings are rotatable around the axis and unmovable in the optical axis direction, a rectilinear guide guiding the rectilinear guide ring in the optical axis direction, a rectilinear cam ring in which a cam slide groove engages the cam slide protrusion and which guides the rectilinear guide in the optical axis direction, and a rotary ring so supported by the rectilinear cam ring that the rectilinear cam and rotary rings are rotatable around the axis and unmovable in the optical axis direction.

Abstract: The optical barrel includes a first barrel member having a guiding portion to guide an optical element holding member in an optical axis direction, and a second barrel member disposed around the first barrel member and being relatively rotatable with the first barrel member. The second barrel member is provided with a cam portion to move the holding member, and with a bayonet engagement portion in an outer circumferential portion of the second barrel member. The first barrel member is provided with a flange portion, and with overhang portions and bayonet protrusion portions in plural areas of the flange portion. Each overhang portion extends along an outer circumferential surface of the second barrel member in the optical axis direction. Each bayonet protrusion portion extends inward in the radial direction and engaging with the bayonet engagement portion.

Abstract: At an inner circumferential surface of a cam frame, second cam grooves and an inner gear are formed. A second lens group frame includes a base, extensions each extending from the base in an optical axis direction, and cam pins each outwardly protruding from a tip end part of a corresponding one of the extensions in a radial direction. In the extension, a stepped part is formed. The stepped part overlaps, when each cam pin moves according to a corresponding one of the second cam grooves, with the inner gear as viewed in the radial direction, and is recessed toward the inside in the radial direction as compared to a tooth tip of the inner gear so as not to overlap with the tooth tip of the inner gear as viewed in a circumferential direction.

Abstract: A flexible lens may be actuated to change its focal length by a deployable lens actuator. The lens actuator translates a rotational motion of an outer frame into a linear radial motion of a plurality of linear elements. The linear elements have fixed pins, which may be slidably coupled to cam pockets in the outer frame. The cam pockets have a gradually varying distance from the center of the outer frame. The rotation of the outer frame thus drives the cam pockets to slide about the pins, thereby causing radial motions of the linear elements. The linear elements stretch a flexible lens, thereby changing a curvature of the flexible lens.

Abstract: A lend barrel includes a first frame having a cam follower and a second frame having a cam engaged with the cam follower. The cam includes a first section extending in a rotational direction of the second frame, a second section continued with the first section and inclined to the rotational direction of the second frame, and a third section continued with the first section on a side opposite of the second section to the first section and inclined to the rotational direction. The cam follower includes a first surface arranged to face the first section of the cam, a second surface continuously formed with the first surface and inclined to the rotational direction, and a third surface continuously formed with the first surface on a side opposite of the second surface to the first surface and inclined to the rotational direction.