Entries |
Document | Title | Date |
20080231968 | ZOOM OPTICAL SYSTEM, IMAGE SENSING DEVICE, AND DIGITAL APPARATUS - A zoom optical system includes first through fourth lens groups having negative-positive-negative-positive optical powers. Assuming that a curvature radius of an object-side lens surface of a negative lens element in the first lens group is r1, a curvature radius of an image-side lens surface of the negative lens element in the first lens group is r2, a focal length of the third lens group is f3, a focal length of the entirety of the optical system at the wide angle end is fw, a focal length of the entirety of the optical system at the telephoto end is ft, and an average refractive index of positive lens elements in the second lens group is nd2p, the zoom optical system satisfies the conditional expressions: | 09-25-2008 |
20080259464 | Zoom Lens and Image Pick-Up Apparatus - There is provided a zoom lens including broad picture angle of 60 to 100 degrees as photographic picture angle of the wide-angle end state, and having magnification ratio of about three to six times, small front gem diameter, excellent compactness and high image formation performance, which is used in video camera or digital still camera, and an image pick-up apparatus using such a zoom lens. A zoom lens ( | 10-23-2008 |
20080285146 | ZOOM LENS AND IMAGE PICKUP APPARATUS HAVING THE SAME - A zoom lens includes, from the object side, first and second lens units of negative and positive refractive power. The lens units move during zooming from the wide-angle end to the telephoto end. The first lens unit includes, from the object side, three negative lenses and a positive lens, at least one of the surfaces of these lenses being aspherical. A spherical surface whose center of curvature is on the optical axis and that includes a point of the intersection of a lens surface and the optical axis and a point on the lens surface determined by the effective aperture is referred to as reference spherical surface of the lens surface. In the first lens unit, the radiuses of curvature of the image-side reference spherical surface of the most object-side negative lens and the object-side reference spherical surface of the second most object-side negative lens are appropriately set. | 11-20-2008 |
20090002844 | ZOOM LENS SYSTEM, OPTICAL APPARATUS, AND METHOD FOR ZOOMING - Providing a zoom lens system having excellent optical performance, an optical apparatus, and a method for zooming the zoom lens system. The zoom lens system includes, in order from an object, a first lens group G | 01-01-2009 |
20090059388 | Zoom lens and imaging apparatus - The invention relates to a zoom lens and an imaging apparatus, and more particularly to a slimmed-down zoom lens well fit for imaging apparatus inclusive of video cameras and digital cameras. The zoom lens comprises, in order from its object side, a first lens group having negative refracting power, a second lens group having positive refracting power, a third lens group having negative refracting power and a fourth lens group having positive refracting power. The first lens group consists of one negative component wherein one negative lens and one positive lens are cemented together. Upon zooming from the wide-angle end to the telephoto end and the second lens group moves toward the object side with a decreasing spacing between the first lens group and the second lens group, a changing spacing between the second lens group and the third lens group and a changing spacing between the third lens group and the fourth lens group. | 03-05-2009 |
20090073573 | Zoom optical system and image taking apparatus using the same - A zoom optical system comprising, in order from an object side: a first lens unit having a negative refractive power; a second lens unit having a positive refractive power; and a third lens unit having a positive refractive power, a space between the lens units being changed to thereby perform zooming and focusing, wherein the first lens unit is constituted of a negative lens. | 03-19-2009 |
20090103186 | Zoom lens and image pickup apparatus equipped with same - A zoom lens is composed, in order from the object side thereof, of a front side lens unit having a negative refracting power at the wide angle end and a rear side lens unit having a positive refracting power at the wide angle end. The front side lens unit includes a first lens unit located closest to the object side and having a positive refracting power and a second lens unit located on the image side of the first lens unit and having a negative refracting power. The distance between the first lens unit and the second lens unit is larger at the telephoto end than at the wide angle end. The rear side lens unit includes a third lens unit located closer to the object side at the telephoto end than at the wide angle end and having a positive refracting power, the distance between the third lens unit and the second lens unit being smaller at the telephoto end than at the wide angle end. The third lens unit satisfies the following condition: 0.0104-23-2009 | |
20090116120 | ZOOM LENS AND IMAGE PICKUP APPARATUS HAVING THE ZOOM LENS - A zoom lens includes, in order from an object side to an image side, a first lens unit having a positive refractive power and configured to move along an optical axis during zooming, a second lens unit having a negative refractive power and configured to move with a locus convex towards the image side during zooming, a third lens unit having a positive refractive power, and a fourth lens unit having a negative refractive power. The first lens unit is located closer to the object side at a telephoto end than at a wide-angle end and the second lens unit is located closer to the image side at the telephoto end than at the wide-angle end. A focal length of the second lens unit (f | 05-07-2009 |
20090135499 | MACRO OBJECTIVE - A description is given of a macro objective (M) with a corrective compensation of aberrations (Continuous Aberration Suppression; CAS). The macro objective has a first positive optical subassembly (A), a second nearly afocal optical subassembly (B), a stop (APE), a third nearly afocal optical subassembly (B′) and a fourth positive optical subassembly (A′). The third optical subassembly (B′) and the fourth positive optical subassembly (A′) are designed with mirror symmetry relative to the optical subassemblies (A, B) upstream of the stop (APE). The nearly afocal optical subassemblies (B, B′) are displaced jointly inside the macro objective (M) along the optical axis (OA) with the aid of mechanical means in conjunction with linear magnifications of β′≠−1. As a result, the macro objective (M) achieves outstanding imaging properties both over a wide range of linear magnifications (β′=−2.0 to −0.5) and over a wide wavelength spectrum. | 05-28-2009 |
20090135500 | ZOOM LENS AND CAMERA DEVICE INCLUDING THE SAME - A zoom lens includes a first lens group having a positive focal length, a second lens group having a negative focal length, a third lens group having a positive focal length, a fourth lens group having a negative focal length which are arranged in order from an object side to an image side, and a diaphragm disposed between the second and third lens groups. During a change of zoom ratio from short to long focus end, the first to fourth lens groups move so that an interval between the first and second lens groups increases, an interval between the second and third lens groups decreases, and an interval between the third and fourth lens groups increases. The first lens group includes first and second negative lenses, a reflective optical element, and at least one positive lens arranged in order from the object side to the image side. | 05-28-2009 |
20090153979 | Zoom lens and electronic imaging apparatus using the same - A zoom lens includes, in order from the object side, a first lens unit with negative power, a second lens unit with positive power, a third lens unit with positive power, and a fourth lens unit. When the magnification of the zoom lens is changed in the range from a wide-angle position to a telephoto position, spacing between the first lens unit and the second lens unit is narrowed and spacing between the second lens unit and the third lens unit is widened. An aperture stop moved integrally with the second lens unit is interposed between the most image-side lens element of the first lens unit and the most image-side lens element of the second lens unit. The first lens unit has, in order from the object side, a negative lens element and a positive lens element and satisfies the following conditions: | 06-18-2009 |
20090190235 | ZOOM LENS AND IMAGE PICKUP APPARATUS INCLUDING THE SAME - A zoom lens includes first to fourth lens units which respectively have negative, positive, negative, and positive refractive powers in order from the object side to the image side. Distances between the first and second lens units, the second and third lens units, and the third and fourth lens units at the telephoto end are respectively smaller, larger, and smaller than those at the wide-angle end. An Abbe number v | 07-30-2009 |
20090303609 | High magnification compact zoom lens - The present invention is directed to high magnification compact zoom lenses that are reduced in diameter of groups of lens pieces closer to the imaging plane to provide downsized lightweight zoom lenses of magnification as high as 20 diameters, with an image stabilizer or vibration compensating mechanism being also reduced in dimensions. An exemplary improved high magnification zoom lens has four groups of lens pieces, namely, the first or leading lens group G | 12-10-2009 |
20090310227 | Zoom Lens, Digital Camera and Mobile Information Terminal Device - There are comprised a first group lens G | 12-17-2009 |
20100014169 | ZOOM LENS AND IMAGING APPARATUS - This is addressed to provide a zoom lens which has a good optical performance for imaging device having a large number of pixels even with its simple construction, and which can also be small and thin in structure, and an imaging apparatus using the zoom lens. A zoom lens | 01-21-2010 |
20100053766 | ZOOM LENS AND IMAGE PICKUP APPARATUS HAVING THE SAME - A zoom lens includes, in order from an object side to an image side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, a third lens unit having a negative refractive power, and a fourth lens unit having a positive refractive power. In the zoom lens, an interval between every adjacent ones of the first through fourth lens units varies during zooming, the second lens unit includes at least one negative lens, and the third lens unit includes at least one positive lens. An Abbe number and a relative partial dispersion of a material of the at least one negative lens (υd2N, θgF2N) and an Abbe number and a relative partial dispersion of a material of the at least one positive lens (υd3P, θgF3P) are appropriately set. | 03-04-2010 |
20100053767 | Zoom lens and image pickup apparatus - A zoom lens includes, in order from its object side, a first lens unit having a negative refracting power, a second lens unit having a positive refracting power, a third lens unit having a negative refracting power, and a fourth lens unit having a positive refracting power. The zoom lens further includes an aperture stop disposed between the first lens unit and the third lens unit. During zooming from the wide angle end to the telephoto end, distances between the lens units change, the first lens unit moves first toward the image side and thereafter toward the object side, the second lens unit moves in such a way as to be located closer to the object side at the telephoto end than at the wide angle end, the distance between the second lens unit and the third lens unit is larger at the telephoto end than at the wide angle end, and the aperture stop moves in such a way as to be located closer to the object side at the telephoto end than at the wide angle end. The second lens unit and the third lens unit satisfy certain conditions. | 03-04-2010 |
20100149655 | PROJECTION-USE ZOOM LENS - The present invention provides a zoom lens having fewer constituting lenses and capable of easily keeping telecentricity. From a projection plane side, lens groups ranging from a first lens group to a fourth lens group are disposed, sequentially. The first lens group consists of the three lenses, one negative lens, one positive lens and one negative lens arranged sequentially from the projection plane side, and has a negative power. The second lens group consists of three lenses in total, that is, one positive lens, one compound lens and one compound lens arranged sequentially from the projection plane PL side and has a positive power. The third lens group consists of one negative lens. The fourth lens group consists of one positive lens. At power varying, the first lens group and the second lens group are moved with the third lens group and the fourth lens group kept fixed. The third lens group is moved for focusing. | 06-17-2010 |
20100149656 | Zoom lens and image pickup apparatus using the same - A zoom lens includes:
| 06-17-2010 |
20100165480 | ZOOM LENS SYSTEM, IMAGING DEVICE AND CAMERA - A zoom lens system, in order from an object side to an image side, comprising a first lens unit having negative optical power, a second lens unit having positive optical power, and at least one subsequent lens unit having optical power, wherein in zooming from a wide-angle limit to a telephoto limit, the lens units are moved along an optical axis such that an air space between at least any two lens units among the lens units should vary, so that variable magnification is achieved, wherein the first lens unit includes a lens element having a reflecting surface for bending a light beam incident from the object, and wherein the condition is satisfied: 0.20<|f | 07-01-2010 |
20100172030 | Zoom lens and image capture apparatus - An image capture apparatus includes: a zoom lens; and an image pickup device converting an optical image formed by the zoom lens into an electric signal. The zoom lens includes, in order from the object side, a first lens group with a negative focal length, a second lens group with a positive focal length, a third lens group with a negative focal length, and a fourth lens group with a positive focal length. During zooming from a wide-angle end to a telephoto end, the first lens group moves along a locus having a convex shape toward an image side while decreasing an air space between the first and second lens groups, and the second and third lens groups move toward the object side while increasing an air space therebetween. | 07-08-2010 |
20100188755 | ZOOM LENS SYSTEM, IMAGING APPARATUS, AND METHOD FOR MANUFACTURING ZOOM LENS SYSTEM - A zoom lens system including, in order from an object, a first lens group G | 07-29-2010 |
20100195216 | ZOOM LENS SYSTEM, INTERCHANGEABLE LENS APPARATUS AND CAMERA SYSTEM - Provided is a zoom lens system including a compact focusing lens unit and having a suppressed change in image magnification at the time of movement of the focusing lens unit. A zoom lens system of the present invention, in order from an object side to an image side, includes, a first lens unit G | 08-05-2010 |
20100202064 | Zoom lens system and image pickup apparatus using the same - A zoom lens system includes in order from an object side to an image side, a first lens unit having a negative refracting power, a second lens unit having a positive refracting power, a third lens unit having a negative refracting power, and a fourth lens unit having a positive refracting power. At the time of zooming from a wide angle end to a telephoto end, distances between the lens units change by at least the first lens unit, the second lens unit, and the third lens unit being moved. The second lens unit includes in order from the object side, a first sub-unit having a positive refracting power, a second sub-unit having a negative refracting power, and a third sub-unit having a positive refracting power. A surface on the object side and a surface on an image side of each of the first sub-unit, the second sub-unit, and the third sub-unit are in contact with air, and (the zoom lens system) satisfies the following conditional expression (1). | 08-12-2010 |
20100259834 | Wide-angle zoom lens - The present invention is directed to wide-angle zoom lenses dedicated to single-lens reflex digital cameras, which attains zoom ratio greater than 2. Such a wide-angle zoom lens has four groups of lens pieces, namely comprising the leading or foremost 1st lens group of negative refractivity closest to an objective field, the succeeding 2nd lens group of positive refractivity, the third lens group of negative refractivity, and the trailing 4th lens group of positive refractivity arranged in this order to move each lens group to vary optical power; and the 1st lens group includes a front subset of the lens pieces of negative refractive power and a rear subset of negative refractive power. The front-end lens piece in the 1st lens group is shaped in negative meniscus lens that has its concave surface faced toward an imaging plane and has the opposite surfaces shaped aspherical. The front and rear subsets of the 1st lens group meet requirements of a focal length as expressed in the following formula: | 10-14-2010 |
20100302649 | ZOOM LENS WITH HIGH OPTICAL PERFORMANCE THROUGHOUT ENTIRE ZOOM RANGE AND IMAGE PICKUP APPARATUS HAVING THE SAME - A zoom lens comprises, 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, and a fourth lens unit having a positive refractive power. The fourth lens unit includes a forty-first lens unit having a negative refractive power and arranged at the object side with reference to the longest air gap and a forty-second lens unit having a positive refractive power and arranged at the image side with reference to the air gap. The forty-first lens unit includes a negative 411st lens, and the forty-second lens unit includes a positive 421st lens. Abbe numbers and partial dispersion ratios of materials of the 411st lens and the 421st lens υd | 12-02-2010 |
20100302650 | ZOOM LENS AND IMAGE PICKUP APPARATUS HAVING THE SAME - A zoom lens comprises 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 rear group including at least one lens unit, in order from an object side to an image side. Each of the lens units is configured to move so that a total lens length at a wide-angle end is longer than that at a telephoto end to perform a zoom operation. A movement amount M | 12-02-2010 |
20100328783 | ZOOM LENS AND IMAGE PICKUP APPARATUS WITH THE SAME - The zoom lens includes, in order from an object side, a first lens unit (positive), a second lens unit (negative), a reflective member and subsequent lens units. A distance between the second and subsequent lens units is reduced during zooming from a wide-angle end to a telephoto end. One of the subsequent lens units includes a non-shift lens unit and a shift lens unit shiftable for image stabilization. The conditions of 1<(1−βb)βr<3 and 0.7012-30-2010 |
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20110096407 | Zoom lens and image pickup device - A zoom lens includes three groups that are a negative first group, a positive second group, and a positive third group in order from an object side. The first group includes a negative cemented lens formed by joining together, from the object side, a first lens formed by a negative single lens and a second lens formed by a positive single lens. The second group includes, from the object side, a third lens formed by a positive single lens and a cemented lens formed by joining together a fourth lens formed by a positive single lens and a fifth lens formed by a negative single lens. The third group includes a sixth lens formed by a positive single lens. | 04-28-2011 |
20110134538 | 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. | 06-09-2011 |
20110222167 | COMPACT ZOOM LENS - A zoom lens includes a first lens group including an optical path change member that changes an optical path, a second lens group including at least one negative lens and at least one positive lens, and lens groups having a positive refractive power. The first lens group is closer to an object side of the zoom lens and is fixed relative to an image plane during a zooming operation. The second lens group is adapted to move during the zooming operation. Each of the lens groups includes at least one positive lens, and the lens groups are closer to an image plane side of the zoom lens. The zoom lens satisfies vdLP>71, vdL2p<40, and ndL2m>1.71, wherein “vdLP” is an Abbe number, “vdL2p” is an Abbe number, and “ndL2m” is a refractive index. | 09-15-2011 |
20110242676 | Lens Module and Camera Device Having The Same - The present disclosure relates to a lens module, the module including a first lens having a positive (+) refractive power and capable of moving for zooming operation; a second lens having a negative (−) refractive power; a third lens having a positive (+) refractive power and having an inflection point at an image surface; and a fourth lens having a negative (−) refractive power. | 10-06-2011 |
20110261468 | LIGHT MODULATION PANEL AND IMAGING LENS - A light modulation panel is inserted into an optical path of an imaging lens composed of an image-forming optical system to make the imaging lens function as a depth-of-field-extended optical system. The light modulation panel has power that makes a peak position of defocus MTF when the imaging lens is used alone to function as the image-forming optical system and a peak position of defocus MTF when the imaging lens functions as the depth-of-field-extended optical system by insertion of the light modulation panel into the optical path of the imaging lens coincide with each other. | 10-27-2011 |
20110279908 | Image forming optical system and image pick up apparatus using the same - An image forming optical system includes in order from an object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power, which includes an aperture stop, a third lens group having a negative refractive power, and a fourth lens group having a positive refractive power. The first lens group, in order from the object side, includes a negative sub-group and a positive sub-group. The third lens group is a focusing group which includes only a cemented lens having a convex surface directed toward the object side, of a negative lens and a positive meniscus lens, in order from the object side. | 11-17-2011 |
20120008214 | Image pickup apparatus having optical path reflecting zoom lens - An image pickup apparatus includes a zoom lens, and an image pickup element having an image pickup surface which receives an image which has been formed by the zoom lens, and converts to an electric signal. When an object having a uniform brightness is captured, at any state from the wide angle end to the telephoto end, the zoom lens satisfies conditional expression (A). The image pickup apparatus includes a shading correction parameter storage section which stores a shading correction parameter which differs at a front-surface side and a rear-surface side with respect to a center of an image, which is for correcting asymmetric shading at the front-surface side and the rear-surface side of the zoom lens, and
| 01-12-2012 |
20120008215 | Zoom Lens and Image Pickup Apparatus Equipped with Same - A zoom lens has a plurality of lens units including, in order from its object side to image side, a first lens unit having a negative refracting power composed of two lens elements including a biconcave negative lens and a positive lens, and a second lens unit having a positive refracting power composed of four lens elements including a positive lens and a negative lens. During zooming from the wide angle end to the telephoto end, a distance between the lens units changes, and the second lens unit moves toward the object side. The zoom lens has an aperture stop that moves integrally with the second lens during the zooming and satisfies a specific condition. | 01-12-2012 |
20120013994 | ZOOM LENS AND IMAGE PICKUP APPARATUS EQUIPPED WITH ZOOM LENS - A zoom lens includes, in order from an object side to an image side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, a third lens unit having a negative refractive power, and a fourth lens unit having a positive refractive power. A distance between consecutive lens units of the first through fourth lens units varies for zooming. The first lens unit includes, in order from the object side to the image side, a negative lens and a positive lens whose surface on the object side has a convex shape. In the zoom lens, a focal length f | 01-19-2012 |
20120026603 | ZOOM LENS - A zoom lens disposed between an object side and an image side and including a first, second, third, and fourth lens group is provided. The first lens group has a negative refractive power and includes a first lens and a prism arranged in sequence from the object side to the image side. The first lens is an aspheric lens. A distance between the first lens and the prism is L, an effective focal length of the zoom lens at a wide-end is fw, and 1.5802-02-2012 | |
20120044576 | ZOOM LENS AND IMAGE PICKUP APPARATUS INCLUDING THE SAME - A zoom lens includes in order from an object side to an image side and arranged along an optical axis thereof, a first lens unit having a negative refractive power, and a second lens unit having a positive refractive power. A distance between each lens unit changes when zooming from a wide-angle end to a telephoto end. The first lens unit includes a first lens sub-unit including a positive lens element and a negative lens element, and having a negative refractive power, and a second lens sub-unit including a single negative lens element. Focusing is performed by moving the second lens sub-unit in an optical axis direction, a focal length of the second lens sub-unit f | 02-23-2012 |
20120057247 | Zoom lens system and image pickup device having the same - A zoom lens system according to the present invention includes a first lens group with negative refractive power, a second lens group with positive refractive power, a third lens group with positive refractive power, and a fourth lens group with negative refractive power which are arranged in turn from the object side toward the image side, and the zoom lens system is formed so that, in performing a zooming operation from the wide angle end position to the telephoto end position, the first lens group keeps still, the distance between the first and second lens groups becomes small, the distance between the second and third lens groups becomes wide, and the distance between the third and fourth lens groups to becomes small. | 03-08-2012 |
20120063002 | ZOOM LENS AND IMAGE PICKUP APPARATUS INCLUDING THE SAME - A zoom lens, including in order from an object side to an image side: a first lens unit; a second lens unit; a third lens unit; and a fourth lens unit, in which the second lens unit includes four lenses as a whole, in which a first lens and a second lens are disposed successively in order from the object side to the image side, and the following conditional expressions are satisfied: 7.803-15-2012 | |
20120120501 | Zoom Lens Having Optical Path Bending Member and Image Pickup Apparatus Equipped with Same - A zoom lens includes, in order from the object side to the image side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a third lens unit including a lens. The distance between the first lens unit and the second lens unit is smaller at the telephoto end than at the wide angle end, and the distance between the second lens unit and the third lens unit changes during zooming from the wide angle end to the telephoto end. The first lens unit consists, in order from the object side, of a front sub lens unit having a negative refractive power, an optical path bending member, and a rear sub lens unit having a positive refractive power. The front sub lens unit includes a biconcave single lens, and the rear sub lens unit includes one or two single lenses. | 05-17-2012 |
20120127584 | IMAGING LENS - An imaging lens includes a first lens having positive refractive power; a second lens having negative refractive power; a third lens having negative refractive power; and a fourth lens having negative refractive power, arranged from an object side to an image plane side. In the first lens, a curvature radius on an object-side surface is positive and a curvature radius of an image-side surface is negative. In the third lens, curvature radii of an object-side surface and an image-side surface are both negative. In the fourth lens, curvature radii of an object-side surface and an image-side surface thereof are both positive. When the whole lens system has a focal length f and a distance from the object-side surface of the first lens to an image-side surface of the fourth lens is L | 05-24-2012 |
20120134031 | ZOOM LENS AND IMAGE PICKUP APPARATUS INCLUDING THE SAME - A zoom lens includes, in order from an object side to an image side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a third lens unit having positive or negative refractive power, and a rear lens group including one or more lens units, an aperture stop is provided on the image side of the second lens unit. A sum of relative anomalous partial dispersion ΔθgF of materials of negative lenses included in the second lens unit, a sum of power of a negative lens formed of a material having relative anomalous partial dispersion that is equal to or more than an average value of relative anomalous partial dispersion of the materials of the negative lenses included in the second lens unit, and a refractive power of the second lens unit are appropriately set. | 05-31-2012 |
20120170135 | LENS SYSTEM, WIDE-ANGLE LENS, OPTICAL APPARATUS EQUIPPED WITH LENS SYSTEM, AND METHOD FOR MANUFACTURING LENS SYSTEM - With comprising, in order from an object side: a first lens L | 07-05-2012 |
20120218645 | ZOOM LENS AND IMAGE PICKUP APPARATUS HAVING THE SAME - A zoom lens includes a first lens unit with positive refraction that is stationary for zooming, a second unit with negative refraction that moves during zooming, a third unit that moves on the optical axis along with movement of the second unit, and a fourth unit with positive refraction that is stationary during zooming, arranged in order from the object to image planes. The first unit includes a negative meniscus element G | 08-30-2012 |
20120257285 | Zoom Lens System, Imaging Device and Camera - A zoom lens system, in order from an object side to an image side, comprising: a first lens unit having negative optical power; a second lens unit having positive optical power; a third lens unit having negative optical power; and a fourth lens unit having positive optical power, wherein the third lens unit is composed of two or less lens elements, the fourth lens unit is composed of two or less lens elements, the first lens unit has at least one air space between lens elements constituting the first lens unit, and the condition: D | 10-11-2012 |
20120268831 | WIDE ANGLE ZOOM LENS - Embodiments of a zoom lens system may comprise at least four lens groups having a NPNP power sequence. The first lens group may include a stationary lens element. The second through fourth lens groups may be movable during zooming. An additional movable N or P lens group on the image side of the system may correct field curvatures or astigmatism. The first lens group may include a stationary, N first lens subgroup and an N second lens subgroup having a movable lens element for focusing. The first lens group may contribute to low focus breathing. Multiple lens groups may have matching movement plans. Some embodiments may be high speed and have a first lens group that can be stationary during zoom. Some embodiments may have only one aspheric surface. | 10-25-2012 |
20120268832 | ZOOM LENS SYSTEM WITH WIDE ANGLE OF VIEW - A high zoom ratio wide-angle zoom lens system includes a first lens group comprising a first lens of biconcave, a second lens of positive meniscus, a third lens of biconvex, and a fourth lens of biconvex wherein the first lens and the second lens are lenses not cemented together by adhesive; a second lens group comprising a fifth lens of positive meniscus, a sixth lens of biconcave, a seventh lens of biconvex, and an eighth lens of plano-concave; a third lens group comprising a ninth lens of biconvex; and a fourth lens group comprising a tenth lens of biconvex, an eleventh lens of plano-concave, a twelfth lens of biconvex, and a thirteenth lens of biconcave. The zoom lens system has a wide angle of view of at least 70-degree, high zoom ratio, and other advantages. | 10-25-2012 |
20130003189 | ZOOM LENS AND IMAGE PICKUP APPARATUS INCLUDING THE SAME - A zoom lens includes, in order from an object side, a positive first lens unit which does not move for zooming, a negative second lens unit which moves in an optical axis direction for zooming, a negative third lens unit which moves in the optical axis direction for zooming so as to correct image plane variation due to zooming, and a positive fourth lens unit which does not move for zooming. The fourth lens unit includes, in an order from the object side, a positive first sub lens unit and a positive second sub lens unit, which are separated by a largest air interval in the fourth lens unit. Abbe constants, partial dispersion ratios, and coefficients of the refractive index variation due to the temperature variation are appropriately set for lens materials forming the third lens unit, the first sub lens unit, and the second sub lens unit. | 01-03-2013 |
20130021677 | ZOOM LENS - A zoom lens includes a first lens group that has a lens having negative refractive power and a light path changing member; a second lens group that includes a lens having positive refractive power and a lens having negative refractive power, and has negative refractive power as a whole; a third lens group that includes a stop, a front group lens having positive refractive power, and a rear group lens having negative refractive power, and has positive refractive power as a whole; and a fourth lens group having positive or negative refractive power. Upon changing magnification from a wide-angle end to a telephoto end, the first lens group and the fourth lens group are fixed. The second lens group moves to the object side after the second lens group moves to an image side, and the third lens group linearly moves to the object side. | 01-24-2013 |
20130155524 | ZOOM LENS AND IMAGE PROJECTION APPARATUS INCLUDING THE SAME - Provided is a zoom lens, including in order from a magnification conjugate side to a reduction conjugate side: a first lens unit having a negative refractive power; a second lens unit having a positive refractive power; a third lens unit having a positive refractive power; a fourth lens unit having a negative refractive power; a fifth lens unit having a negative refractive power; and a sixth lens unit having a positive refractive power. The first and sixth lens units do not move for zooming, while the second to fifth lens units move to the magnification conjugate side during zooming from a wide-angle end to a telephoto end. Each of the second and third lens units is composed of a single positive lens. Movement amounts of the second, third and fourth lens units during zooming from the wide-angle end to the telephoto end satisfy appropriate relationships. | 06-20-2013 |
20130222924 | ZOOM LENS AND IMAGE PICKUP APPARATUS - Disposing from an object side in the order of a positive first lens group which is fixed at the time of zooming, a negative second lens group which is moved at the time of zooming, an aperture stop, a positive third lens group which is fixed at the time of zooming, and a fourth lens group which is moved along the optical axis at the time of zooming to correct a change in image plane position arising from the zooming for focusing. When a refractive index of the third group first lens with respect to d-line, a focal length of the third group, and focal lengths of the overall lens system at a wide angle end and a telephoto end are taken as Nd31, f3, fw, and ft respectively, conditional expressions (1): 1.7708-29-2013 | |
20130314801 | OPTICAL ZOOM LENS SYSTEM - According to various aspects, an optical zoom lens system and a method magnifying an image using an optical zoom lens system are disclosed. In one example, the optical zoom lens system comprises a first lens group including a first focus-tunable lens and a first negative lens, a second lens group, positioned after the first lens group in an optical path, a third lens group, positioned after the second lens group in the optical path, and a fourth lens group, positioned after the third lens group in the optical path, including a second focus-tunable lens and a second negative lens. | 11-28-2013 |
20140029110 | ZOOM LENS AND IMAGE PICKUP APPARATUS INCLUDING THE SAME - A zoom lens includes, in order from an object side to an image side, first to fourth lens units having negative, positive, negative, and positive refractive power, respectively. During zooming from a wide-angle end to a telephoto end, at least the first, second, and third lens units move. The focal lengths of the first, second, and third lens units, the amount of movement of the second lens unit during zooming from the wide-angle end to the telephoto end, a lateral magnification at the wide-angle end of the second lens unit, a lateral magnification at the wide-angle end of the third lens unit, a lateral magnification at the telephoto end of the second lens unit, and the lateral magnification at the telephoto end of the third lens unit are appropriately set. | 01-30-2014 |
20140029111 | OPTICAL SYSTEM, IMAGING APPARATUS AND METHOD FOR MANUFACTURING THE OPTICAL SYSTEM - An optical system comprises a first lens element and a second lens element which are respectively shiftable to have a component in a direction perpendicular to the optical axis, the second lens element being composed of the first lens element and other lens element, and the first lens element or the second lens element being shifted to have a component in a direction perpendicular to the optical axis, thereby carrying out a correction of the image plane. Thus, there are provided an optical system having a suitable vibration reduction property, an image apparatus equipped with the optical system and a method for manufacturing the optical system. | 01-30-2014 |
20140043693 | OPTICAL SYSTEM FOR IMAGING AN OBJECT - An optical system for imaging an object on an image acquisition unit. The optical system, from the object, comprises a first lens unit, a second lens unit, a third lens unit and a fourth lens unit in the direction of the image acquisition unit. The first lens unit comprises at least one lens group with negative refractive power. The second lens unit comprises at least one lens group with positive refractive power and the third lens unit comprises at least one lens group with negative refractive power. The second lens unit and the third lens unit overall comprise at least three lens groups. From the first lens unit in the direction of an image acquisition unit, the first lens group, the second lens group and then the third lens group are arranged. The three lens groups have a movable design for adjusting the focal length of the optical system. | 02-13-2014 |
20140104698 | ZOOM LENS AND IMAGING APPARATUS - A zoom lens includes: a first lens group having a positive power; a second lens group having a negative power; a third lens group having a positive power; and a fourth lens group having a negative power, in this order from an object side. All of the groups move along an optical axis such that the distance between the first group and the second group gradually becomes greater, the distance between the second group and the third group gradually becomes smaller, and the distance between the third group and the fourth group gradually becomes greater, when changing magnification from a wide angle to a telephoto end. The zoom lens satisfies the conditional formulae: −2.004-17-2014 | |
20140104699 | ZOOM LENS AND IMAGING APPARATUS - A zoom lens includes: a first lens group having a positive refractive power; a second lens group having a negative refractive power; a third lens group having a positive refractive power; and a fourth lens group having a negative refractive power provided in this order from an object side. All of the lens groups move along an optical axis such that the distance between the first lens group and the second group gradually becomes greater, the distance between the second lens group and the third lens group gradually becomes smaller, and the distance between the third lens group and the fourth lens group gradually becomes greater when changing magnification from a wide angle end to a telephoto end. The fourth lens group practically includes a lens having a positive refractive power, a lens having a negative refractive power, and a lens having a positive refractive power. | 04-17-2014 |
20140177067 | ZOOM LENS SYSTEM - A zoom lens system includes a negative first lens group, a positive second lens group, a negative third lens group, and a positive fourth lens group. Upon zooming from the short to the long focal length extremities, the distance between the first and second lens groups decreases, the distance between the second and third lens groups increases, and the distance between the third and fourth lens groups decreases. The following conditions (1) and (2) are satisfied: | 06-26-2014 |
20140198394 | ZOOM LENS AND IMAGING APPARATUS - A zoom lens includes a positive first lens group fixed during zooming, a negative second lens moved to the image side upon zooming from the wide angle end to the telephoto end, a negative third lens group for image plane correction during zooming, and a positive fourth lens group fixed during zooming. The first lens group is composed of a negative first lens group front group, a positive first lens group middle group, and a positive first lens group rear group, disposed in order from the object side. The first lens group front group is composed of two negative lenses and one positive lens, disposed in order from the object side. Focusing is performed by moving only the first lens group middle group in an optical axis direction. The zoom lens satisfies a predetermined conditional expression. | 07-17-2014 |
20140320977 | ZOOM LENS AND IMAGE PICKUP APPARATUS INCLUDING THE SAME - A zoom lens includes in order from an object side: a positive first lens unit; a negative second lens unit which moves during zooming; a third lens unit; a stop; and a positive fourth lens unit. The first lens unit includes, in order from the object side, a negative first lens subunit which does not move, a positive second lens subunit which moves during focusing, and a positive third lens subunit which does not move. The first lens subunit is composed of one or more negative lenses, and the second lens subunit includes a positive lens and a negative lens. An average value of Abbe constants of the first lens subunit, an average value of Abbe constants of the positive lenses of the second lens subunit, and an average value of Abbe constants of the negative lenses of the second lens subunit are appropriately set. | 10-30-2014 |
20150043086 | ZOOMING OPTICAL SYSTEM, OPTICAL APPARATUS AND METHOD FOR MANUFACTURING ZOOMING OPTICAL SYSTEM - A compact zooming optical system, an optical apparatus and a method for manufacturing the zooming optical system having a vibration reduction function, a high zooming ratio, a wide-angle view and superb optical performance are provided, the system including, in order from an object side: a first lens group G | 02-12-2015 |
20150370053 | ZOOM LENS - In a zoom lens of a fixed total length, at the time of changing the magnification from the wide-angle end toward the telephoto end, the first lens group is anchored while the second lens group is moved, and the third and fourth lens groups are moved so as to be located at the object side of the telephoto end relative to the wide-angle end, such that: the interval between the second and third lens groups is decreased at the telephoto end relative to the wide-angle end; the interval between the third and fourth lens groups is increased at the telephoto end relative to the wide-angle end; and the interval between the fourth and fifth lens groups is increased at the telephoto end relative to the wide-angle end, and at the time of focusing a near object point from a remote object point, the second lens group is moved. | 12-24-2015 |
20160041367 | Image Pickup Apparatus Equipped with Zoom Lens with Bent Optical Path - A zoom lens with a bent optical path includes, in order from the object side to the image side, a first lens unit including the reflecting member and having a negative refractive power, a second lens unit having a positive refractive power, a third lens unit having a negative refractive power, and a fourth lens unit having a positive refractive power. During zooming from the wide angle end to the telephoto end, the second lens unit moves closer to the first lens unit only toward the object side, the third lens unit moves in such a way that it becomes closest to the second lens unit at an intermediate focal length position in the course of zooming as compared to the state at the wide angle end and the state at the telephoto end, and the fourth lens unit moves. The zoom lens satisfies a certain condition. | 02-11-2016 |
20160062090 | ZOOM LENS AND IMAGING APPARATUS - A zoom lens consists of, in order from the object side, a positive first group, a negative second group, one or two middle groups including a positive mp group, and a positive rearmost group disposed at the most image-side position of the entire system. Zooming is effected by changing all distances between the adjacent groups. An A cemented lens formed by a positive lens and a negative lens which are cemented together in this order from the object side is disposed at the most object-side position of the second group, a B cemented lens formed by one positive lens and one negative lens is disposed on the image side of the A cemented lens and on the object side of the mp group, and a C cemented lens formed by one positive lens and one negative lens is disposed in the mp group. The zoom lens satisfies given condition expressions. | 03-03-2016 |
20160077318 | Zoom Lens and Image Pickup Apparatus Using the Same - A zoom lens includes in order from an object side to an image side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a third lens unit having a negative refractive power. At the time of zooming, distances between the lens units change, and a distance between the first lens unit and the second lens unit at a telephoto end is shorter than a distance between the first lens unit and the second lens unit at a wide angle end, and an aperture stop is disposed on an image side of an image-side surface of the first lens unit, and on an object side of an image-side surface of the second lens unit, and the zoom lens satisfies the conditional expressions. | 03-17-2016 |
20160131879 | ZOOM LENS AND IMAGE PICKUP APPARATUS INCLUDING THE SAME - A zoom lens, includes, in order from an object side: a positive first lens unit; a negative second lens unit; and a rear lens group that includes at least two lens units and is positive as a whole over an entire zoom range, intervals between adjacent lens units changing during zooming. The second lens unit includes at least two negative lenses successively arranged including a first negative lens arranged closest to the object side and a second negative lens, an object-side surface of the first negative lens includes an aspherical surface having a positive aspherical surface amount; and an image-side surface of the first negative lens and surfaces of the second negative lens include a surface having an aspherical surface having a positive aspherical surface amount and a surface having an aspherical surface having a negative aspherical surface amount. | 05-12-2016 |
20170235112 | ZOOM LENS UNIT, IMAGING DEVICE, AND MONITORING VIDEO CAMERA | 08-17-2017 |