| Entries |
| Document | Title | Date |
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| 20080198479 | OPTICAL APPARATUS - An optical apparatus includes an optical system including first and second movable lens units independently movable in an optical axis direction, and a controller causing the first movable lens unit to wobble in the optical axis direction based on contrast information. The optical system satisfies |tk/L|<15, where tk represents a distance from an image plane position to an exit pupil position when the exit pupil position is closest to the image plane position, L represents an effective diagonal length of an image at the image plane position. The controller causes the second movable lens unit to wobble in the optical axis direction to reduce variation of the position of the exit pupil in association with the wobbling of the first movable lens unit. The apparatus is capable of suppressing image twitching while obtaining a high focusing performance. | 08-21-2008 |
| 20080225406 | CLOSE-UP LENS, IMAGING APPARATUS, AND METHOD FOR FOCUSING CLOSE-UP LENS - Providing a close-up lens with superb optical performance capable of focusing from infinity to a close distance allowing a life-size magnification by an internal focusing system with small moving amounts of focusing lens groups, an imaging apparatus, and a method for focusing a close-up lens. The close-up lens includes four lens groups, and is able to focus an object with an imaging magnification from β=0 through at least β=−0.5, wherein upon focusing, a first lens group and a fourth lens group are fixed with respect to an image plane, and a second lens group and a third lens group are moved along an optical axis. | 09-18-2008 |
| 20090034094 | DRIVING MECHANISM, DRIVING DEVICE, AND LENS DRIVING DEVICE - A driving mechanism, a driving device, and a lens driving device includes a lever member. The lever member includes an arm portion for surrounding a part of a driven member in a side direction. The arm portion has a plurality of displacement output portions to be engaged with the driven member. The lever member is constructed in such a manner that a displacement amount of the displacement output portions in a predetermined first axis direction is set larger than a displacement amount of a displacement input portion to be generated by input of a moving force to be applied by a shape memory alloy actuator. The driving mechanism, the driving device, and the lens driving device enable to obtain a large displacement amount with a reduced size and a reduced weight, and stably move the driven member. | 02-05-2009 |
| 20090097133 | LENS CONTROL APPARATUS - A lens control apparatus for controlling a lens apparatus having an extender is provided. When an operation of storing a shot is performed in a shot box connected to the lens apparatus having an extender, a memory stores data including a position of a zoom lens group at that time, a position of a focus lens group at that time, and a magnification of the extender at that time. When an operation of reproducing the shot is performed, a CPU transmits a control signal for moving the zoom lens group and the focus lens group to positions represented by the shot. In addition, the CPU transmits to the lens apparatus a control signal for setting the magnification of the extender at a value of the magnification thereof represented by the stored shot. | 04-16-2009 |
| 20090122419 | LENS DRIVE DEVICE AND COIL WINDING METHOD - A lens drive device may include a movable body, a support body supporting the movable body through a spring member, and a magnetic drive mechanism provided with a coil. The movable body includes a coil winding part, end parts for restricting a range of the coil winding part, and a changing part for changing a drawing direction of the coil. The spring member is disposed near the other end part of the movable body and electrically connected with winding start and winding end of the coil. A coil winding method for the lens drive device may include a drawing step in which a coil is drawn between end parts, a changing step in which a drawing direction of the coil is changed by the changing part, and a winding step in which the coil is wound around the coil winding part. | 05-14-2009 |
| 20090147377 | Optical lens displacement systems - The present invention provides optical systems, devices and methods which utilize one or more electroactive polymer actuators to adjust an optical parameter of the optical device or system. | 06-11-2009 |
| 20090168198 | ZOOM LENS ASSEMBLY CONTROLLED BY SHAPE MEMORY MATERIAL - A zoom lens assembly comprises a first optical component, a second optical component, and an actuator. The actuator comprises a shape memory material that changes its shape in response to electrical or thermal fields to change the distance between the first and second optical components. | 07-02-2009 |
| 20090185284 | LENS MODULE AND CAMERA MODULE UTILIZING THE SAME - A lens module includes a barrel defining a first through hole, two or more lenses received in the first through hole of the barrel including at least one movable lens, and at least one driving device moving the movable lens. The driving device includes a fixed portion, a movable portion, hydraulic fluid, and an adjustment pole. The fixed portion is secured on the inner surface of the barrel and defines a trough with an opening facing along the axis of the lens module. The movable portion has a first end and an opposite second end, the first end inserted into the trough and sealing the space between the first end and the bottom wall of the trough, and the second end secured to a movable lens. The hydraulic fluid fills the space. The adjustment pole is inserted into the trough from a second through hole running through the barrel and a wall of the trough adjacent to the barrel, and is movable in the second through hole. | 07-23-2009 |
| 20090185285 | LENS BARREL AND IMAGING DEVICE - A lens barrel including: an imaging optical system; a tube configured to contain the imaging optical system; a holder configured to hold a lens included in the imaging optical system in the tube in such a way that the lens is movable along a direction of an optical axis of the imaging optical system; a sensor unit configured to output a cyclic detection signal whose peak value changes depending on a movement amount of the holder; a memory unit configured to store a relationship between peak values of the detection signal and a position of the holder in the direction of the optical axis in advance; and an arithmetic processor configured to calculate a position of the holder in the direction of the optical axis from a peak value of a detection signal detected by the sensor unit in movement of the holder based on the relationship stored in the memory unit. | 07-23-2009 |
| 20090195889 | IMAGING DEVICE CAPABLE OF RETRACTING LENS UNIT THEREOF AND LENS UNIT PROTECTING METHOD THEREOF - An imaging device includes a housing, a lens unit, a detection unit, a central processing unit and a driving unit. The lens unit is configured for moving between a first position where the lens unit is received in the housing, and a second position where the lens unit extends from the housing. The detection unit is configured for detecting a current acceleration of the imaging device. The central processing unit is configured for receiving the current acceleration and generating a low driving voltage value if the current acceleration is smaller than a predetermined value and a high driving voltage value if the current acceleration is equal to or greater than the predetermined value. The driving unit is configured for receiving the generated driving voltage value from the central processing unit and retracting the lens unit from the second position to the first position based on the driving voltage. | 08-06-2009 |
| 20090207503 | LENS TUBE, OPTICAL DEVICE HAVING THE LENS TUBE, AND METHOD FOR PRODUCING THE LENS TUBE - A lens tube includes a standard member, a lens, a guide, and a pushing member. The standard member has a standard surface via which the standard member is to be mounted to a camera main body. The lens retainer retains at least one lens and is connected to the standard member movably along an optical axis of the at least one lens. The guide is provided facing the lens retainer in a radial direction of the at least one lens to guide the lens retainer along the optical axis. The pushing member pushes the lens retainer and the guide in opposite directions. | 08-20-2009 |
| 20090219628 | Variable power optical system and image-recording device - A variable power optical system composed of a first optical part, a second optical part, and a third optical part, with the first optical part being movable with respect to the second and third optical parts to change the focal length of the entire system. The first optical part is movably held between the second optical part and the third optical part. The first optical part moves in the direction perpendicular to the optical axis over a distance between the position on the optical system of the entire system and the position of retraction from the optical axis of the entire system. | 09-03-2009 |
| 20090225438 | REFLEX, MAGNIFYING OPTICAL SYSTEM - A first lens group in a reflex, magnifying optical system includes sequentially from the side of an object, a first lens that has a negative refractive power and is a meniscus lens having a concave aspect facing toward an image, an optical element (prism) that refracts an optical path, a second lens having a negative refractive power and a concave aspect facing toward the object, and a third lens having a positive refractive power. A portion of an image-side aspect of the first lens abuts a plane of incidence of the optical element. A portion of an object-side aspect of the second lens abuts a plane of transmission of the optical element. | 09-10-2009 |
| 20090244721 | CAMERA MODULE - A camera module includes a lens unit, a magnet mounted around the lens unit, a stator receiving the lens unit and the magnet therein and an elastic element. The stator includes a coil seat and a coil wound therearound. The coil establishes a magnetic field when an electric current is applied thereto. The magnetic field interacts with a magnetic field of the magnet to generate a magnetic force driving the lens unit into telescopic movement. The elastic element includes at least one rib which has a fixed end connected with the stator and an opposite movable end. The moveable end moves together with the lens unit with respect to the fixed end to generate an elastic force during the telescopic movement of the lens unit. The lens unit stops at a focal position when the magnetic force and the elastic force come to a balance. | 10-01-2009 |
| 20090244722 | TURNING MECHANISM - A turning mechanism is adapted to a projector including a base and a zoom lens set in a base for turning a zoom bar of the zoom lens. The turning mechanism includes a fixed element and a movable element. The fixed element is suitable to be fastened to the base and has a pair of slide tracks. The movable element has a pair of slide edges, a pair of slide hooks, and a turn portion. The slide hooks lock the slide tracks respectively, and the slide edges are supported by the slide tracks respectively. Therefore, the movable element substantially slides around a light axis of the zoom lens relative to the fixed element, so as to move the turn portion to turn the zoom bar. | 10-01-2009 |
| 20090251798 | LENS ACTUATOR AND CAMERA MODULE WITH SAME - A lens actuator for driving a lens received in a lens barrel includes a plate shaped body comprising a through hole defined in the center thereof, an inner portion surrounding the through hole, an outer portion for mounting the lens barrel thereon, and a plurality of resilient portions connected between the inner portion and the outer portion. A plurality of piezoelectric structures formed on the respective resilient portions. The piezoelectric structures are configured for mounting the lens thereon and driving the lens to move relative to the lens barrel. | 10-08-2009 |
| 20090251799 | LENS BARREL - A lens barrel includes a support ring movable in an optical axis direction; a displaceable optical element supported by the support ring movable between a photographing position and a radially-displaced position in which the displaceable optical element is eccentrically displaced from the optical axis; and an advancing/retracting optical element supported by the support ring. When the lens barrel is in a ready-to-photograph state, the displaceable optical element is held at the photographing position, and the displaceable optical element and the advancing/retracting optical element are aligned in the optical axis direction. When the lens barrel moves from the ready-to-photograph state to an accommodated state, the displaceable optical element is held at the radially-displaced position, and the displaceable optical element and the advancing/retracting optical element are relatively moved so as to at least partially coincide with each other in a direction orthogonal to the optical axis. | 10-08-2009 |
| 20090284844 | Position sensing device and lens driving module using the same - Provided is a position sensing device including a sensing unit that is mounted on one side of a lens barrel, which is inserted into a lens housing portion of a base so as to be vertically driven, and includes a light receiving section and a light emitting section which are provided to face each other; a driven grid that has a plurality of slits formed therein and is mounted on the lens barrel; and a fixed grid that has a plurality of slits formed therein and is fixed and coupled to the inside of the sensing unit. | 11-19-2009 |
| 20090303613 | Variable Focal Length Lens, And Focal Length Adjusting Device, And Imaging Apparatus That Use The Same - A variable focal length lens having a simple structure and capable of being used for applications requiring small size is provided, as well as a focal length adjusting device and an imaging device using the same. A variable focal length lens | 12-10-2009 |
| 20090310229 | SYSTEM FOR PROVIDING ZOOM, FOCUS AND APERTURE CONTROL IN A VIDEO INSPECTION DEVICE - An optical system for a remote video inspection device including an elongated probe for inspection of target objects, comprising: an imager located distally within the probe, wherein the imager receives an image of the target object; a focus lens group located within the probe, the focus lens group comprising a variable aperture and at least one focus lens; a zoom lens group located within the probe, the zoom lens group comprising at least one zoom lens, wherein the movement of the zoom lens group in relation to the imager changes the magnification of the image; a tip lens located further from the imager than the focus lens group and the zoom lens group, wherein the distance between the tip lens and the imager is fixed; wherein a first movement of the focus lens group proportional to the movement of the zoom lens group provides an initial image focus, and a second movement of the focus lens group independent of the movement of the zoom lens provides a final image focus and proportional changes to the size of the variable aperture. | 12-17-2009 |
| 20100067120 | LENS BARREL - The present invention provides a lens barrel that has a first barrel member and a second barrel member, and arranges the first barrel member on an outer circumference of the second barrel member to enable the first barrel member to move in an optical axis direction. The lens barrel includes a plurality of engaging members configured to be held by the first barrel member and engaged with an engagement groove formed in the second barrel member, and to move in the optical axis direction along the engagement groove when the second barrel member rotates, and an annular urging member provided in an outer circumferential portion of the first barrel member and configured to urge the plurality of engaging members to the engagement groove formed in the second barrel member. | 03-18-2010 |
| 20100128365 | RETRACTABLE ZOOM LENS - A retractable zoom lens includes a holder, at least one movable barrel assembly received in the holder, a holding frame received in the movable barrel assembly, and a slide barrel engaged with the holding frame. The holding frame can move along the optical axis along with the movement of the movable barrel assembly. The movable barrel assembly is movable along an optical axis of the retractable zoom lens, and the slide barrel is slidable along a direction substantially perpendicular to the optical axis during an object image captured by an image pickup device of the retractable zoom lens. | 05-27-2010 |
| 20100188756 | Zoom dial mechanism - A zoom dial mechanism includes a zoom dial mounted on a base plate so as to extend through a central hole of the base plate and so as to be turnable, a coil spring mounted on the base plate to urge the zoom dial toward a neutral position, and a push knob mounted in a central hole of the dial. The base plate has a groove concentric with the central hole. The coil spring is mounted in the groove. The mechanism further includes a first rib fixed to the dial so as to abut one end of the coil spring and a second rib fixed to the dial so as to abut the other end of the spring. The spring is compressed by the first rib when the dial is turned clockwise, and the coil spring is compressed by the second rib when the dial is turned counterclockwise. | 07-29-2010 |
| 20100208360 | WATERPROOF AND EXTERNALLY MODULATED ZOOM STRUCTURE - The present invention provides a waterproof and externally modulated zoom structure, which comprises a module, on which there are a first adjusting section and a second adjusting section; the first adjusting section and second adjusting section are covered and affixed inside a housing; several adjusting shafts, which are installed on the first adjusting section and second adjusting section, so as to adjust the zoom of the first adjusting section and second adjusting section; several knobs, which are installed outside of the housing, and connected to a revolving axle that passes through the housing; a driving linkage is affixed on the revolving axle, so that the driving linkage can sleeve over the adjusting shaft; when the knob is turned, it can indirectly drive the adjusting shaft, thus adjusting the zoom of the first adjusting section and second adjusting section, in order to make the images more clear; the structure has advantages of simple structure, few components, low production, and feasibility for mass production. | 08-19-2010 |
| 20100232034 | OPTICAL LENS DISPLACEMENT SYSTEMS - The present invention provides optical systems, devices and methods which utilize one or more electroactive polymer actuators to adjust an optical parameter of the optical device or system. | 09-16-2010 |
| 20100271711 | OPTICAL POSITION DETECTING APPARATUS AND OPTICAL APPARATUS - The present apparatus includes: a light emitting portion for emitting a detection-receiving light; a light emitting portion arranged parallel to the light emitting portion for emitting a detection-receiving light; a reflecting plate which is moved relative to the light emitting portions along their parallel arranged direction and also includes an optical pattern where a white area and a black area having a reflectance different from the white area with respect to the detection-receiving lights and are arranged alternately; and a light receiving portion which, according to the light intensities of the detection-receiving lights to be reflected by the reflecting plate, outputs output voltage signals. A controller selects one of the output voltage signals as a position detecting signal and obtains information about the position of a moving lens movable in linking with the reflecting plate. | 10-28-2010 |
| 20110038057 | Optical Imaging Lens Systems - Optical imaging lens systems are disclosed in which a lens assembly ( | 02-17-2011 |
| 20110043928 | Method and Apparatus for Moving a Component in an Optical Sight - A method and apparatus relate to an optical sight having a first section, and having a second section that is movable relative to the first section, and that has optics thereon. One aspect involves: preventing movement of the second section away from a first position past a second position; responding to movement of a member relative to the first section from a third position to a fourth position by moving the second section from the first position to the second position; resiliently urging the second section away from the first position and past the second position when the member is on a side of the fourth position remote from the third position; and releasably retaining the member in a position on a side of the fourth position remote from the third position. | 02-24-2011 |
| 20110051258 | OPTICAL SIGHT FOR MAINTAINING DIOPTER ADJUSTMENT - An optical sight includes a main barrel unit, an objective lens unit, an ocular lens unit, and a magnification unit. The main barrel unit extends about an axis. The objective lens unit is mounted to a front end of the main barrel unit. The ocular lens unit is mounted to a rear end of the main barrel unit, and includes an outer barrel securely connected to the main barrel unit, an inner barrel coupled threadedly with the outer barrel, a lens disposed in the inner barrel, an adjusting barrel disposed on the inner barrel and movable in a direction along the axis, and a release device disposed between the inner barrel and the adjusting barrel. The magnification unit is rotatably disposed in the main barrel unit between the objective lens unit and the ocular lens unit. | 03-03-2011 |
| 20110085252 | OPTICAL SYSTEM AND IMAGING DEVICE - An optical system includes: a main mirror ( | 04-14-2011 |
| 20110096411 | FLEXIBLE LENS ASSEMBLY WITH VARIABLE FOCAL LENGTH - The present invention is related to a lens assembly comprising a flexible lens body ( | 04-28-2011 |
| 20110235187 | LENS BARREL AND IMAGING DEVICE - An interchangeable lens unit comprises a second lens group unit, a focus lens unit, a fourth lens group unit, a zoom ring unit, and a focus motor. The zoom ring unit mechanically transmits operational force inputted to a zoom ring to the second lens group unit and the fourth lens group unit. The focus motor electrically drives the focus lens unit in the Z axis direction with respect to the second lens group unit. When the zoom ring is operated in a state in which no power is being supplied to the focus motor, a gap is always ensured in the Z axis direction between the focus lens unit and the second lens group unit. | 09-29-2011 |
| 20110286110 | LENS BARREL AND IMAGING DEVICE - The lens barrel has a first lens unit that is disposed at the object side and changeable between a first state, a spacing of the lenses is a predetermined spacing, and a second state, the spacing of the lenses is narrower than in the first state; a second lens unit that is disposed at the image side and capable of changing a focusing state by moving along the optical axis; a restricting member that restricts the change of the first lens unit from the first state to the second state; and driving unit that, in a state in which the change to the second state is restricted by the restricting member, moves the second lens unit toward the image side, wherein the restricting member releases the restriction in association with a completion of the movement of the second lens unit by the driving means. | 11-24-2011 |
| 20120019932 | LENS BARREL AND OPTICAL APPARATUS - A lens barrel showing a satisfactory property in assembly and a high dust-proof and drip-proof performance includes: a first member; a lens holding frame configured to hold lens units moving in an optical axis direction to either zoom or focus the lens units; and an elastic member held between respective optical-axis-orthogonal surfaces of the first member and the lens holding frame, wherein the elastic member can be compressed in the optical axis direction during a zooming or focusing operation. | 01-26-2012 |
| 20120044578 | LENS BARREL - A lens barrel capable of increasing the degree of freedom of installation of a detection unit and capable of making the lens barrel compact in size. The lens barrel includes third and fourth lens groups disposed adjacent to each other and movable in a common optical axis direction. In a first movement section, the third lens group moves in unison with the fourth lens group. In a second movement section adjacent to the first movement section, only the third lens group moves. When a photointerrupter fixed to a cover of the third lens group is light-shielded by a light shield plate formed on a lens holder of the fourth lens group, it is detected that a distance between the third and fourth lens groups becomes a predetermined distance. | 02-23-2012 |
| 20120127591 | INTERCHANGEABLE LENS, CAMERA BODY, AND CAMERA SYSTEM - An interchangeable lens has a zoom lens, a zoom driver operable to drive the zoom lens along an optical axis, a focus lens, a focus driver operable to drive the focus lens along the optical axis, and a storage unit operable to store link information which links position information indicating a position of the zoom lens on the optical axis with information about a variation in magnification caused by the focus lens advancing and retreating on the optical axis with the zoom lens located at the position indicated by the position information. | 05-24-2012 |
| 20120293873 | LENS STRUCTURE - The invention discloses a lens structure, which includes a first lens barrel, a second lens barrel and a third lens barrel. The first lens barrel has at least one guide groove. The second lens barrel is disposed within the first lens barrel, and has at least one opening having at least one concave groove. The third lens barrel is disposed within the second lens barrel, and includes at least one guide pin and at least one subsidiary structure. The guide pin moves along the guide groove, and the subsidiary structure moves along the concave groove of the opening. | 11-22-2012 |
| 20130242409 | Zoom Lens Unit and Imaging Apparatus Incorporating the Same - A zoom lens unit | 09-19-2013 |
| 20130342916 | Zoom Lens and Zoom Control Method Thereof - A zoom lens and a zoom control method are disclosed. The zoom lens comprises an image sensing module, a plurality of lens sets, a plurality of reflecting mirrors, a plurality of rotation shafts. The image sensing module senses light beams to generate image signals. The plurality of lens sets respectively have different optical power. The plurality of reflecting minors comprise a movable reflecting mirror and a fixed reflecting minor. The plurality of rotation shafts are coupled the movable reflecting mirror. Therein, the movable reflecting minor is controlled by the plurality of rotation shafts to rotate to a first or a second position, such that the optical paths may be generated when the light beam passes through the lens sets having different optical power and each reflecting minor, and the light beam irradiates into the image sensing module through one of the optical paths. | 12-26-2013 |
| 20140177074 | ZOOM LENS AND IMAGING APPARATUS - A zoom lens includes: a first lens group having a negative refractive power; and a second lens group having a positive refractive power, provided in this order from an object side. Magnification is changed by moving the first lens group and the second lens group. The first lens group includes a first lens having a negative refractive power, a second lens, a third lens having a negative refractive power, and a fourth lens having a positive refractive power, provided in this order from the object side. The zoom lens satisfies predetermined conditional formulae. | 06-26-2014 |
| 20140177075 | ZOOM LENS AND IMAGING APPARATUS - In a zoom lens in which a first lens group having a negative refractive power and a second lens group having a positive refractive power are disposed in order from the object side and zooming is performed by moving the first lens group and the second lens group, the first lens group is formed of a first lens having a negative refractive power, a second lens having a positive refractive power, a third lens having a negative refractive power, and a fourth lens having a positive refractive power, disposed in order from the object side. Then, when the focal length of the entire system at the wide angle end is taken as fw and the focal length of the second lens group are taken as f | 06-26-2014 |
| 20150062719 | SHAPE-VARIABLE OPTICAL ELEMENT - Disclosed herein is a shape-variable optical element including: a shape-variable lens; a first electrode unit configured to be connected to the shape-variable lens; a second electrode unit configured to face the first electrode unit; and a deformation part configured to be disposed between the first electrode unit and the second electrode unit. | 03-05-2015 |
| 20150103413 | Optical System and Optical Instrument, Image Pickup Apparatus, and Image Pickup System Using the Same - An optical system which forms an optical image on an image pickup element, comprising in order from an object side,
| 04-16-2015 |
| 20150131165 | ZOOM LENS AND IMAGE PICKUP APPARATUS INCLUDING THE SAME - Provided is a zoom lens, including, in order from an object side to an image side: a positive first lens unit that does not move for zooming; a negative second lens unit that moves during zooming; and a positive N-th lens unit that does not move for zooming and is arranged closest to the image side. Among lenses constructing the second lens unit, two lenses closest to the image side are a positive lens and a negative lens, and partial dispersion ratios for g-line and F-line and Abbe numbers for a d-line of the positive and negative lenses, and an average value of refractive indices of all the lenses of the second lens unit are appropriately set. | 05-14-2015 |
| 20150293329 | OPTICAL IMAGING SYSTEM - An optical imaging system, including a fixed lens group, a movable lens group, a first reflective optical element, a second reflective optical element, and an imaging surface. The movable lens group is driven to move by a driving mechanism. The first reflective optical element is disposed at one end of an object space and the second reflective optical element is disposed at one end of an image space. The imaging surface is disposed at one side of the second reflective optical element to receive emergent rays from the second reflective optical element. | 10-15-2015 |
| 20150316748 | MINIATURE OPTICAL ZOOM LENS - Miniature zoom lens systems and methods of manufacturing thereof are described. An exemplary system includes a first prism positioned to receive incident light from an entrance to the miniature lens system, at least a first varifocal lens positioned to receive the light that exits the prism, at least one base lens positioned to receive the light after passing through the first varifocal lens, a detector positioned to receive the light after passing through the base lens, and a first actuator configured to move the first varifocal lens in at least a direction perpendicular to propagation axis of the light passing through the first varifocal lens. The miniature lens system has a small z-height and can be implemented in mobile devices such as mobile phones. | 11-05-2015 |
| 20160004052 | ZOOM LENS AND IMAGING APPARATUS - A zoom lens consists of, in order from the object-side, a first lens-group having positive refractive power, and which is fixed during magnification change, a second lens-group having negative refractive power, and which moves during magnification change, a third lens-group having positive refractive power, and which is fixed during magnification change, a fourth lens-group having positive refractive power, and which moves during magnification change, and a fifth lens-group having negative refractive power, and which moves during magnification change. The first lens-group consists of, in order from the object-side, a front group having negative refractive power, a reflection member that bends an optical path and a rear group having positive refractive power. The fourth lens-group includes at least a cemented lens of a positive lens and a negative lens, and the following conditional expression (1) is satisfied: | 01-07-2016 |
