| Entries |
| Document | Title | Date |
|---|
| 20080239507 | IMAGE PROJECTION OPTICAL SYSTEM AND IMAGE PROJECTION APPARATUS - An image projection optical system introduces light from an image-forming element by a zoom lens via an optical element. The optical element satisfies Σ(Di×Ndi)/fw>4.0. The zoom lens includes, in order from a magnification side, first and second lens units, and lens units disposed closer to a reduction side than the second lens unit. The first lens unit is a negative lens unit. The lens units disposed closer to the reduction side than the second lens unit satisfy |dn/dt|<1.0×10 | 10-02-2008 |
| 20090097130 | Zoom lens and electronic imaging device having the same - A zoom lens includes a most object-side lens unit remaining fixed on the optical axis when the magnification of the zoom lens is changed and a focusing operation is performed; a most image-side lens unit remaining fixed when the focusing operation is performed; and a plurality of moving lens units lying between the most object-side lens unit and the most image-side lens unit, moved along the optical axis when the magnification is changed. The most object-side lens unit includes, in order from the object side, a negative lens component, a reflective optical component having a reflecting surface for bending the optical path, and a positive lens component. The most image-side lens unit has at least one aspherical surface. An electronic imaging device includes an electronic image sensor located on the image side of the zoom lens. | 04-16-2009 |
| 20090168192 | OPTICAL SYSTEM AND OPTICAL APPARATUS INCLUDING THE SAME - An optical system includes a first negative lens element disposed nearest a front side and a first positive lens element whose front surface resides within a distance 0.4 L from the surface nearest the front side toward a rear side of the optical system having a total lens length L. By appropriately determining the materials for the two lens elements, the optical system realizes a wide angle of view while correcting lateral chromatic aberration well. | 07-02-2009 |
| 20090201590 | OPTICAL SYSTEM AND OPTICAL APPARATUS INCLUDING OPTICAL SYSTEM - An optical system used for an image pickup apparatus including an image pickup element is provided. The optical system includes a negative lens disposed furthest away on the enlargement conjugation side and satisfies the following condition: 80 degrees<2ω, where 2ω (degrees) denotes an angle of view of the optical system. In addition, the following parameters of the optical system are optimally determined: a lens open angle θ of a surface of the negative lens on the reduction conjugation side, an index of refraction Ndn and an Abbe number vdn of a material of the negative lens for a d-line, and a relative partial dispersion θgFn of the material of the negative lens for a g-line and an F-line. | 08-13-2009 |
| 20100165476 | OPTICAL SYSTEM AND OPTICAL APPARATUS INCLUDING OPTICAL SYSTEM - Provided are an imaging optical system in which chromatic aberrations are excellently corrected across the entire screen to realize high optical performance, and an optical apparatus including the imaging optical system. In an imaging optical system of which a back focus is longer than a focal length, a lens unit located in a reduction-conjugate side of an aperture stop includes at least one positive lens. A partial dispersion ratio and an Abbe number of the positive lens are set such that a refractive index, a position, and a power satisfy a suitable relationship. | 07-01-2010 |
| 20110134537 | ZOOM LENS SYSTEM, OPTICAL APPARATUS EQUIPPED THEREWITH, AND METHOD FOR ZOOMING ZOOM LENS SYSTEM - A zoom lens system ZL installed in an electronic still camera | 06-09-2011 |
| 20110141574 | ZOOM LENS, OPTICAL APPARATUS AND METHOD FOR MANUFACTURING ZOOM LENS - A zoom lens includes, in order from an object side along an optical axis: a first lens group G1 having negative refractive power; a second lens group G2 having positive refractive power; and a third lens group G3 having positive refractive power. Upon zooming from a wide-angle end state to a telephoto end state, a distance between the first lens group G1 and the second lens group G2 varies, and a distance between the second lens group G2 and the third lens group G3 varies, and a given conditional expression is satisfied. | 06-16-2011 |
| 20110141575 | ZOOM LENS SYSTEM, OPTICAL APPARATUS EQUIPPED WITH ZOOM LENS SYSTEM AND METHOD FOR ZOOMING ZOOM LENS SYSTEM - A zoom lens system ZL mounted in an electronic still camera | 06-16-2011 |
| 20110149411 | ZOOM LENS - A zoom lens having less distortion and exhibiting good imaging performance is provided. A zoom lens includes a first lens unit provided at the extremity of an enlargement conjugate side and having a negative refractive power, and a final lens unit provided at the extremity of a reduction conjugate side and having a positive refractive power. The final lens unit includes a cemented lens at the extremity of the reduction conjugate side. The cemented lens has a positive refractive power. The zoom lens satisfies specific conditional expressions. | 06-23-2011 |
| 20110194190 | ZOOM LENS SYSTEM AND ELECTRONIC IMAGING APPARATUS THAT USES THE SAME - A zoom lens system includes a negative first lens group, a positive second lens group, and a positive third lens group, in this order from the object. | 08-11-2011 |
| 20110194191 | ZOOM LENS SYSTEM, IMAGING APPARATUS, AND METHOD FOR ZOOMING THE ZOOM LENS SYSTEM - Providing a zoom lens system having excellent optical performance with a high zoom ratio, an imaging apparatus, and a method for zooming the zoom lens system. The system including, in order from an object, a first group G | 08-11-2011 |
| 20110211263 | IMAGING LENS, OPTICAL APPARATUS INCLUDING IMAGING LENS AND METHOD FOR MANUFACTURING IMAGING LENS - An imaging lens SL mounted in a digital single lens reflex camera | 09-01-2011 |
| 20110267704 | ZOOM LENS FOR PROJECTION AND PROJECTION-TYPE DISPLAY APPARATUS - A zoom lens for projection includes a negative first lens group, a positive second lens group, a positive third lens group, and a positive fourth lens group, which are arranged from the magnification side of the zoom lens in the order mentioned above. The first lens group and the fourth lens group are fixed during zooming, but the second lens group and the third lens group move on optical axis Z of the zoom lens toward the magnification side, based on an operation for operating the zoom lens from wide end to tele end, in such a manner that a distance between the second lens group and the third lens group changes. Further, the following formula (1) is satisfied: | 11-03-2011 |
| 20110279906 | VARIABLE MAGNIFICATION OPTICAL SYSTEM AND IMAGING APPARATUS - A variable magnification optical system includes a negative first lens group, a stop and a positive second lens group, arranged from the object side in the order mentioned above. The magnification of the variable magnification optical system is changed by changing a distance between the first lens group and the second lens group in the direction of an optical axis. The first lens group includes a negative plastic lens, and the second lens group includes a positive plastic lens. Further, the following formulas (1) and (2) are satisfied: | 11-17-2011 |
| 20110304921 | ZOOM LENS FOR PROJECTION AND PROJECTION-TYPE DISPLAY APPARATUS - A zoom lens for projection includes a negative magnification-side lens group fixed while magnification is changed, a plurality of lens groups that move while magnification is changed, and a positive reduction-side lens group fixed while magnification is changed which are arranged in this order from the magnification side. The magnification-side lens group is composed of a negative front-group and a positive rear-group, arranged in this order from the magnification side. The rear-group is composed of a positive lens, a negative lens and a positive lens, arranged in this order from the magnification side, and focusing is performed by moving the rear-group. Further, the following formulas (1) and (2) are satisfied: | 12-15-2011 |
| 20120019926 | ZOOM LENS SYSTEM, OPTICAL APPARATUS AND METHOD FOR MANUFACTURING ZOOM LENS SYSTEM - A zoom lens system comprising, in order from an object side: a first lens group G | 01-26-2012 |
| 20120026601 | 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 and at least one subsequent lens unit, wherein a second lens unit is located closest to the object side in the subsequent lens units, an interval between the first lens unit and a lens unit which is one of the at least one subsequent lens unit varies in zooming, the condition: L | 02-02-2012 |
| 20120044575 | RETROFOCUS WIDE-ANGLE LENS SYSTEM AND OPTICAL INSTRUMENT PROVIDED WITH THE SAME - A retrofocus wide-angle lens system is provided, wherein the entire the wide-angle lens system is divided at a position that satisfies the following condition (1) between a theoretical front lens group having a negative refractive power, and a theoretical rear lens group having a positive refractive power including the diaphragm, at a minimum focal length, and wherein a flat parallel plate is disposed at the position that satisfies the following condition (1): | 02-23-2012 |
| 20120057246 | COMPACT ZOOM LENS - A zoom lens including, in a sequence from an object side to an image plane side: a first lens group having a negative refractive power; a second lens group having a positive refractive power; a third lens group having a negative refractive power; and a fourth lens group having a positive refractive power. During zooming from a wide angle position to a telephoto position, an interval between the first lens group and the second lens group decreases, an interval between the second lens group and the third lens group increases, and an interval between the third lens group and the fourth lens group decreases. When the location of an object changes from ∞ to a close location, the first lens group is moved toward the object to perform focusing. | 03-08-2012 |
| 20120063001 | ZOOM LENS SYSTEM - A zoom lens system includes a negative first lens group, a positive second lens group, and a positive third lens group, in that order from the object side. Upon zooming from the short to long focal length extremities, the first through third lens groups move along an optical axis direction so that the distance between the first and second lens groups decreases, and the distance between the second and third lens groups increases. The first lens group includes a negative glass lens element and at least two plastic lens elements, in that order from the object side, and wherein the following condition (1) is satisfied:
| 03-15-2012 |
| 20120229912 | ZOOM LENS SYSTEM - A zoom lens system includes a negative first lens group, a positive second lens group, and a positive third lens group, in that order from the object side, wherein upon zooming from the short focal length extremity to the long focal length extremity, the distance between the first lens group and the second lens group decreases, and the distance between the second lens group and the third lens group increases. The second lens group includes a positive first sub-lens group and a negative second sub-lens group, in that order from the object side. The second sub-lens group is a negative single lens element serving as an image-stabilizer lens group which moves in directions orthogonal to the optical axis to change the imaging position to correct image shake. | 09-13-2012 |
| 20120243107 | ZOOM LENS SYSTEM - A zoom lens system includes a negative first lens group, a positive second lens group, and a positive third lens group, in that order from the object side, wherein upon zooming from the short to long focal length extremities, the distance between the first lens group and the second lens group decreases, and the distance between the second lens group and the third lens group increases. The second lens group includes a positive first sub-lens group and a negative second sub-lens group, in that order from the object side. In at least part of the zooming range of the zoom lens system, the second sub-lens group and the third lens group each serves as a focusing lens group that is moved along the optical axis during a focusing operation. | 09-27-2012 |
| 20120275032 | ZOOM LENS SYSTEM, IMAGING APPARATUS, AND METHOD FOR ZOOMING THE ZOOM LENS SYSTEM - Providing a zoom lens system having excellent optical performance with a high zoom ratio, an imaging apparatus, and a method for zooming the zoom lens system. The system including, in order from an object, a first group G | 11-01-2012 |
| 20120293871 | ZOOM LENS - A zoom lens includes a first lens group, a second lens group, a third lens group, and a fourth lens group. The first lens group includes a first lens that has positive refractive power, a second lens that has negative refractive power, and a prism. The second lens group includes a third lens that has positive refractive power and a fourth lens that has negative refractive power. The third lens group includes a stop, a fifth lens that has positive refractive power, and a sixth lens that has negative refractive power. The fourth lens group includes a seventh lens that has positive refractive power. Upon changing magnification from a wide-angle end to a telephoto end, the first and fourth lens groups are fixed, the second lens group first moves toward an image plane side and then moves toward an object side, and the third lens group linearly moves toward the object side. | 11-22-2012 |
| 20120307372 | ZOOM LENS, AND IMAGING APPARATUS INCORPORATING THE SAME - The zoom lens comprises, from an object side, a first lens group, a second lens group that includes an aperture stop moving integrally therewith, a third lens group, and a fourth lens group having, respectively, negative, positive, negative, and positive refracting power, and during zooming from a wide-angle end to a telephoto end, a spacing between the first and second lens groups becomes narrow, between the second and third lens groups changes, and between the third and fourth lens groups grows wide, and the first lens group includes a first lens having negative refracting power, a second lens having a reflective surface for bending a light ray coming out of an object and a third lens having positive refracting power, and in said second lens group, a most image-plane-side surface of a lens having negative refracting power is configured in a concave shape on an image plane side. | 12-06-2012 |
| 20130027785 | ZOOM LENS AND PHOTOGRAPHING DEVICE HAVING THE SAME - A zoom lens and a photographing device including the zoom lens, the zoom lens including a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having a positive refractive power, which are sequentially arranged in the direction from an object side to an image side. During zooming from a wide angle position to a telephoto position, an interval between the first lens group and the second lens group decreases, and an interval between the second lens group and the third lens group increases. The first lens group comprises a first lens, a second lens being a negative lens formed of plastic, and a third lens being a positive lens formed of plastic. Therefore, the zoom lens is compact and low-priced and has a high magnification. | 01-31-2013 |
| 20130057964 | ZOOM LENS - An embodiment of this invention provides a zoom lens that primarily comprises, in order from an object side to an image-forming side, a first lens group having negative refractive power, a second lens group having positive refractive power, and a third lens group having positive refractive power. The second lens group comprises several lenses, in which the focal length of the first lens from the object side is efl3, the focal length of the second lens from the object side is efl4, and efl3 and efl4 satisfy: 0| 03-07-2013 | |
| 20130094095 | PROJECTION ZOOM LENS - When at least two resin lenses having oppositely signed power factors are disposed in positions that are not relatively far away from each other in a lens group disposed on a high magnification side with respect to an aperture stop, the difference in temperature between the two resin lenses can be reduced, whereby the amount of change in the focal point of an overall projection zoom lens can be reduced. The lens groups on the high magnification side with respect to the aperture stop, which are close to the atmosphere, experience a relatively small increase in temperature when in use. The focus shift due to variation in temperature can therefore be reliably reduced by disposing the resin lenses, which are readily affected by an increase in temperature, on the high magnification side with respect to the aperture stop. | 04-18-2013 |
| 20130094096 | PROJECTION ZOOM LENS - A projection zoom lens is formed of the following lens groups sequentially arranged from the high magnification side: a first lens group fixed at the time of zooming and having negative power; a second lens group moved along the optical axis at the time of zooming and having negative power; a third lens group moved at the time of zooming and having positive power; a fourth lens group moved at the time of zooming; and a fifth lens group fixed at the time of zooming and having positive power. When the total lens system operating at the wide angle end has a focal length Fw, and the first lens group has a focal length F | 04-18-2013 |
| 20130235465 | ZOOM LENS AND PHOTOGRAPHING APPARATUS INCLUDING THE SAME - A zoom lens and a photographing apparatus including the same. The zoom lens includes, in an order from an object side: a first lens group having negative refractive power; a second lens group having positive refractive power; a third lens group having positive refractive power; and a fourth lens group having an iris on a side of the fourth lens group closest to the object side and positive refractive power, wherein, while zooming from a wide angle position to a telephoto position, the first through fourth lens groups are moved such that the interval between the first and second lens groups increases, the interval between the second and third lens groups decreases, and the interval between the third and fourth lens groups decreases, and focusing is performed by moving the third lens group. | 09-12-2013 |
| 20130314799 | OPTICAL ZOOM LENS ASSEMBLY - This invention discloses an optical zoom lens assembly, sequentially arranged from an object side to an image side along an optical axis comprising: a first lens-group, a second lens-group and a third lens-group. The first lens-group with negative refractive power comprises at least one positive lens, and at least one negative lens. The second lens-group with positive refractive power comprises at least one positive lens, and at least one negative lens. The third lens-group with a positive refractive power comprises at least one aspheric lens. Therein, refractive indexes of the first lens-group, the second lens-group and the third lens-group are small than 1.69. Therefore, the present invention can reduce manufacturing costs and provide good image quality to be applied to cameras, cell phone cameras and other devices. | 11-28-2013 |
| 20130321930 | PROJECTION ZOOM LENS - A projection zoom lens includes a front lens group, a rear lens group, and an aperture stop. The front lens group has negative refractive power and is disposed adjacent to an object side of the projection zoom lens. The front lens group includes a first lens group, a second lens group, and a third lens group. The rear lens group has positive refractive power and is disposed adjacent to an image side of the projection zoom lens. The rear lens group includes a fourth lens group, a fifth lens group, and a sixth lens group. The aperture stop is disposed between the front lens group and the rear lens group. The third lens group, the fourth lens group, and the fifth lens group move along an optical axis of the projection zoom lens to change an effective focal length of the projection zoom lens when the projection zoom lens zooms. | 12-05-2013 |
| 20140022647 | ZOOM LENS, AND IMAGING APPARATUS INCORPORATING THE SAME - The invention provides a zoom lens, characterized by comprising, a zoom lens, which comprises, in order from an object side thereof: a first lens group of negative refracting power, a second lens group of positive refracting power, a third lens group of negative refracting power, and a fourth lens group of positive refracting power, wherein: upon zooming from a wide-angle end to a telephoto end of the zoom lens, a separation between the respective lens groups changes, upon focusing from a focusing-on-infinity state to a close-range focusing state, the third lens group moves in an optical axis direction, and the conditions (1) and (2) are satisfied at the wide-angle end. | 01-23-2014 |
| 20140036376 | ZOOM LENS SYSTEM, IMAGING APPARATUS, AND METHOD FOR MANUFACTURING ZOOM LENS SYSTEM - A zoom lens system includes, in order from an object, a front group G1 having negative refractive power, a rear group G2 having positive refractive power, zooming being conducted by varying a distance between the front group G1 and the rear group G2, the front group G1 including at least a negative lens and a positive lens, and the rear group G2 including, in order from an object side, a first partial group LA having positive refractive power, a second partial group LB having negative refractive power, a third partial group LC having positive refractive power and a negative lens LD, and predetermined conditions being satisfied, thereby providing a zoom lens system which is compact in size, and has small back focus and excellent optical property. | 02-06-2014 |
| 20140043691 | VARIABLE MAGNIFICATION OPTICAL SYSTEM AND IMAGING APPARATUS - A variable magnification optical system includes, in order from the object side, a negative first lens group and a positive second lens group, wherein the interval between these lens groups in the optical axis direction is changed during magnification change. The most image-side lens and the second most image-side lens of the first lens group are a negative single lens with a concave surface facing the object side and a positive single lens, respectively. The second lens group includes, in order from the object side, a positive lens disposed at the most object-side position with at least one surface thereof being an aspherical surface, a first cemented lens formed by a negative lens and a positive lens, and a second cemented lens formed by a negative lens and a positive lens. | 02-13-2014 |
| 20140063612 | PROJECTOR ZOOM LENS AND PROJECTOR - A projector zoom lens includes a first lens group having a negative refractive power and a second lens group having a positive refractive power. The first lens group includes a first front group having a negative refractive power and a first rear group having a positive refractive power, including a positive meniscus lens with a convex surface on an enlargement side. The second lens group includes a second front group having a positive refractive power, including two continuously arranged positive lenses made from a same glass material and having a same surface profile and a second rear group having a negative refractive power, including a biconcave lens and a biconvex lens, the lenses of the first and second lens groups being arranged in order from an enlargement side to a reduction side. | 03-06-2014 |
| 20140085732 | ZOOM LENS SYSTEM, IMAGING APPARATUS, AND METHOD FOR ZOOMING THE ZOOM LENS SYSTEM - Providing a zoom lens system having excellent optical performance with a high zoom ratio, an imaging apparatus, and a method for zooming the zoom lens system. The system including, in order from an object, a first group G | 03-27-2014 |
| 20140111868 | VARIABLE-MAGNIFICATION PROJECTION OPTICAL SYSTEM AND PROJECTION DISPLAY DEVICE - A variable-magnification projection optical system substantially consists of a negative first lens group that is disposed at the most enlargement-side position and is fixed during magnification change, a positive last lens group that is disposed at the most reduction-side position and is fixed during magnification change, and a plurality of lens groups that are disposed between the first lens group and last lens group and are moved during magnification change. The lens groups that are moved during magnification change substantially consist of three lens groups, wherein the most enlargement-side lens group is a negative lens group. Predetermined conditional expressions relating to a back focus of the entire system on the reduction side at the wide-angle end, a focal length of the entire system at the wide-angle end, a focal length of the last lens group, and a focal length of the first lens group are satisfied. | 04-24-2014 |
| 20140111869 | ZOOM LENS AND IMAGING APPARATUS - A zoom lens includes: a first lens group having a negative power; and a second lens group having a positive power, in this order from an object side. The first lens group includes a first lens having a negative power and a second lens having a positive power. The zoom lens satisfies conditional formulae 1.6<|f1|/fw<2.5 (1); 1.6| 04-24-2014 | |
| 20140139930 | ZOOM LENS AND IMAGE PROJECTION APPARATUS INCLUDING ZOOM LENS - A zoom lens includes a front group, an aperture stop, and a rear group. The front group includes a lens unit configured not to move during zooming and a front variable power lens unit including one or more lens units and configured not to move during zooming. The rear group includes, in order from a magnification conjugate side to a reduction conjugate side, a rear variable power lens unit having one or more lens units and configured to move during zooming, and a lens unit configured not to move during zooming. The aperture stop moves during zooming, and the front group has an auxiliary stop which moves during zooming. A length from a focal point position of the front group to the aperture stop, and imaging magnifications of the rear group, at a wide angle end and a telephoto end, are set to adequate values. | 05-22-2014 |
| 20140153105 | 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 four lenses and the object side surface of the second lens in the first lens group is made concave on the object side in the paraxial region. When the paraxial radii of curvature of the object side surface and the image side surface of the second lens are taken as r | 06-05-2014 |
| 20140153106 | 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 and the second lens groups, the first lens group is formed of 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. Then, when the focal length of the second lens, the focal length of the entire system at the wide angle end, the focal length of the first lens group, and the focal length of the second lens group are taken as f | 06-05-2014 |
| 20140153107 | 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. | 06-05-2014 |
| 20140168788 | 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. | 06-19-2014 |
| 20140185143 | PROJECTION ZOOM LENS - Disclosed is a projection zoom lens used in an image display device configured to project an image onto a target projection surface and display a magnified image of the image, in which the projection zoom lens has a five-lens-group configuration in which first to fifth lens groups G | 07-03-2014 |
| 20140185144 | IMAGE DISPLAY DEVICE - An image display device includes a high-performance projection zoom lens with a very wide field angle and an image display device including a projection zoom lens of a five-lens-group type, which achieves high performance across the entire zoom area. The image display device is configured to project an image onto a target projection surface and display a magnified image of the image, which uses a projection zoom lens having a five-lens-group configuration in which first to fifth lens groups G | 07-03-2014 |
| 20140192421 | WIDE-ANGLE LENS, IMAGING APPARATUS, AND METHOD FOR MANUFACTURING WIDE-ANGLE LENS - Including: a front lens group Gf disposed to an object side of an aperture stop; and a rear lens group Gr disposed to an image side of the aperture stop; the front lens group including a sub-lens group Ga having negative refractive power, the sub-lens group Ga including, in order from the most object side, at least three negative lenses, at least one of the three negative lens being an aspherical negative meniscus lens, the aspherical negative meniscus lens having a shape that negative refractive power is getting smaller from the center to the periphery, a cemented lens constructed by a positive lens, a negative lens, and a positive lens being disposed to the image side of the sub-lens group Ga, and given conditional expressions being satisfied, thereby providing a wide-angle lens having high optical performance with a wide angle of view. | 07-10-2014 |
| 20140198392 | ZOOM LENS SYSTEM - A zoom lens system that includes a first lens group including at least one lens and having a negative refractive power, and a second lens group including at least one lens and having a positive refractive power in an order from an object side to an image side, wherein the zoom lens system is configured to perform zooming by changing a distance between the first lens group and the second lens group and satisfies: 2<|f1/fw|<2.5 and 0.60<|f1/f2|<0.85, wherein f1 indicates a synthetic focal length of the first lens group, fw indicates an overall focal length at a wide angle end, and f2 indicates a synthetic focal length of the second lens group. | 07-17-2014 |
| 20140198393 | ZOOM LENS AND IMAGE PICKUP APPARATUS INCLUDING THE SAME - A zoom lens including a plurality of lens units, and two variable stops having an aperture diameter changing for zooming, the lens units being configured to change intervals between the respective neighboring lens units for zooming, the zoom lens having an F-number which is constant over an entire zoom range, the two variable stops including a first variable stop disposed on an object side, and a second variable stop disposed on an image side. A distance (Sw1) from the first variable stop to an image plane at a wide-angle end, a distance (Sw2) from the second variable stop to the image plane at the wide-angle end, and a distance (Tkw) from an exit pupil position to the image plane at the wide-angle end are each set appropriately. | 07-17-2014 |
| 20140247504 | ZOOM LENS FOR PROJECTION AND PROJECTION-TYPE DISPLAY APPARATS - A zoom lens for projection substantially consists of a first lens-group having negative refractive-power, and which is arranged on a most magnification-side, and which is fixed during magnification change, a second lens-group having negative refractive-power, and which is arranged on a reduction-side of the first lens-group, and which is fixed during magnification change, a last lens-group having positive refractive-power, and which is arranged on a most reduction-side, and which is fixed during magnification change, and three lens-groups arranged between the last lens-group and the second lens-group, and which move during magnification change. The zoom lens is configured to be telecentric on a reduction-side, and focusing is performed by moving only the second lens-group. The lens-groups that move during magnification change are substantially a third lens-group having positive refractive-power, a fourth lens-group having positive refractive-power and a fifth lens-group having positive refractive-power, which are arranged in this order form a magnification-side. | 09-04-2014 |
| 20140268363 | ZOOM OPTICAL SYSTEM - Provided is a zoom optical system which includes, in order from an object, a first lens group having negative refractive power and other lens groups, and in which an interval between each lens group changes upon zooming, wherein the first lens group includes a first negative lens which is disposed closest to the object and has a diffractive optical element on an image side lens surface, and a positive lens disposed closer to the image than the first negative lens, and the glass material used for the positive lens satisfies the following conditions expressions: ν1p≦35 and Δ(θg, F)≧0.007, where ν1p denotes an Abbe number, based on the d-line, of the glass material used for the positive lens of the first lens group, and Δ(θg, F) denotes a deviation of the partial dispersion ratio of the glass material, which is used for the positive lens, from a standard line that connects a glass type A and a glass type B in a graph of which abscissa is an Abbe number νd based on the d-line, and the ordinate is the partial dispersion ratio (θg, F)=(ng−nF)/(nF−nC), with the Abbe number νd and the partial dispersion ratio (θg, F) of the glass type A and the glass type B being as follows: Glass type A: νd=60.49, (θg, F)=0.5436; glass type B: νd=36.26, (θg, F)=0.5828. | 09-18-2014 |
| 20140285901 | ZOOM LENS AND IMAGING APPARATUS - A zoom lens includes, in order from the object side, a negative first lens group, a positive second lens group and a positive third lens group, wherein, during magnification change from the wide-angle end to the telephoto end, at least the first and second lens groups are moved such that the interval between the first and second lens groups decreases and the interval between the second and third lens groups increases. The first lens group includes a negative meniscus first-group first lens with a convex object-side surface, a negative meniscus first-group second lens with a convex object-side surface, and a positive first-group third lens with a convex object-side surface, and the second lens group includes a positive lens, a cemented lens formed by a positive lens and a negative lens, a positive lens and a negative lens, in order from the object side. The zoom lens satisfies given conditional expressions. | 09-25-2014 |
| 20140293437 | ZOOM LENS AND IMAGING APPARATUS - A zoom lens includes, in order from the object side, a first lens group having a negative refractive power, a second lens group having a positive refractive power and a third lens group having a positive refractive power, wherein, during magnification change from the wide-angle end to the telephoto end, at least the first lens group and the second lens group are moved along the optical axis such that the interval between the first lens group and the second lens group is decreased and the interval between the second lens group and the third lens group is increased. The second lens group includes, in order from the object side, a positive lens, a cemented lens formed by a positive lens and a negative lens, a positive lens and a negative lens. The zoom lens satisfies given conditional expressions. | 10-02-2014 |
| 20140320976 | ZOOM LENS AND IMAGE PICKUP DEVICE INCLUDING THE SAME - A zoom lens includes, in order from an object side to an image side: first and second lens units having negative and positive refractive powers, respectively; a middle lens group; and a final lens unit having a positive refractive power, wherein the middle lens group comprises a focus lens unit that has a negative refractive power and moves toward the image side during focusing from infinity to a short distance, the intervals between adjacent lens units vary during at least one of zooming and focusing, and wherein the focal length f | 10-30-2014 |
| 20140340763 | IMAGING LENS AND IMAGING APPARATUS INCLUDING THE SAME - The imaging lens substantially consists of a negative first lens group in which a biconvex lens, a cemented lens, a plurality of lenses including a positive lens and a negative lens are arranged; a positive second lens group including a cemented lens; a negative third lens group in which a single lens forming a meniscus lens with a convex surface toward the object side or a plurality of lenses constituted in such a manner that the absolute value of the radius of curvature of a lens surface disposed on the most image side is smaller than the absolute value of the radius of curvature of a lens surface disposed on the most object side; and a positive fourth lens group including a positive lens in this order from the object side. This imaging lens is configured in such a manner that conditional expression (1) is satisfied: | 11-20-2014 |
| 20140355129 | ZOOM LENS, IMAGING APPARATUS, AND METHOD FOR MANUFACTURING ZOOM LENS - A zoom lens including, from an object: a front group having negative power; and a rear group having positive power, the rear group including, from the object, a positive lens, a negative lens having a concave surface facing the object, a cemented positive lens constructed by a negative lens and a positive lens, and a cemented lens constructed by a positive lens and a negative lens, the rear group further including a focusing group disposed to the object side of the positive lens La for focusing from infinity to a close object by moving from the object side to an image side, a distance between the front group and the rear group being varied thereby zooming from a wide-angle end state to a telephoto end state, and given condition being satisfied, thereby providing a downsized zoom lens having wide angle of view and excellent optical performance with fewer lenses. | 12-04-2014 |
| 20140376101 | ZOOM LENS FOR PROJECTION AND PROJECTION-TYPE DISPLAY APPARATUS - A zoom lens for projection substantially consists of a negative first lens group, a positive second lens group, a positive third lens group, a negative fourth lens group, a positive fifth lens group, and a positive sixth lens in this order from a magnification side. The first lens group and the sixth lens group are fixed and the second lens group through the fifth lens group move during magnification change. A reduction side is telecentric. First through fourth lenses from the magnification side in the fifth lens group are a negative meniscus-shaped single lens with its convex surface facing the magnification side, a positive single lens, a biconcave lens and a biconvex lens, respectively, and the biconcave lens and the biconvex lens are cemented together. | 12-25-2014 |
| 20150009577 | Zoom Lens and Image Pickup Apparatus Equipped with Same - A zoom lens includes, in order from the 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. The first lens unit includes a negative lens and a positive lens. The zoom lens satisfies the following conditional expression (1): | 01-08-2015 |
| 20150015966 | ZOOM LENS AND OPTICAL APPARATUS INCLUDING THE SAME - Provided is a zoom lens in which a variation in aberration with respect to a temperature change is small and excellent optical characteristics can be easily obtained. The zoom lens includes multiple lens units in which a distance between adjacent ones of the multiple lens units changes for zooming. When an average value of a change in refractive index with respect to a temperature change within a temperature range of from 0° C. to 40° C. is ΔNav, at least one lens unit L of the multiple lens units includes multiple optical elements A made of materials satisfying a conditional expression: |ΔNav|>5.0×10 | 01-15-2015 |
| 20150015967 | PROJECTION ZOOM LENS AND PROJECTION TYPE DISPLAY DEVICE - A projection zoom lens in which a magnification change operation is performed by moving three to four lens groups as moving groups, wherein a first lens group, which is a lens group on the most-magnification side, substantially consists of a moving group having a negative refractive power; a lens group on the most-reduction side is composed of a moving group having a positive refractive power; and the first lens group which is the lens group the most-magnification side substantially consists of two lenses. In this case, conditional formula (1) below is satisfied, where fw is the focal length of the entire system at the wide angle end and fm is the focal length of the lens group on the most-magnification side: | 01-15-2015 |
| 20150055225 | ZOOM LENS AND IMAGE PROJECTION APPARATUS INCLUDING THE SAME - A zoom lens includes, sequentially from an enlargement conjugate side to a reduction conjugate side: a 1st lens unit having negative refractive power not moved during zooming; plural lens units that are moved during zooming; and a final lens unit having positive refractive power that is not moved during zooming. A final moving lens unit having positive refractive power and disposed nearest to the reduction conjugate side among the plural lens units that are moved during zooming is moved toward the enlargement conjugate side during zooming from a wide angle end to a telephoto end, and the final moving lens unit includes one or more cemented lenses, and the final moving lens unit includes one or more negative lenses and one or more positive lenses. Predetermined conditional expressions are satisfied to maintain wide angle of view and high image quality along the entire zoom range. | 02-26-2015 |
| 20150085374 | VARIABLE POWER OPTICAL SYSTEM AND IMAGE PICKUP APPARATUS HAVING THE SAME - Provided are a variable power optical system in which the value of the entire length with respect to the image height is reduced and the aberration is well corrected, and an image pickup device comprising the same. Specifically provided is a variable power optical system comprising, in order from the object side, at least a first lens group having negative refractive power, a variable power group having positive refractive power, and a final lens group having positive refractive power, wherein the variable power group is provided with, in order from the object side, a first lens element having positive refractive power, a second lens element, and a third lens element, the second lens element has a convex shape on the object side, and the final lens group comprises a positive lens, the variable power optical system satisfying the following conditional expression: | 03-26-2015 |
| 20150131162 | ZOOM LENS AND IMAGING APPARATUS - A zoom lens substantially consists of a negative first lens group, a stop, a positive second lens group, a negative third lens group, a positive fourth lens group, and a positive fifth lens group in this order from the object side; wherein
| 05-14-2015 |
| 20150131163 | ZOOM LENS AND IMAGING APPARATUS - A zoom lens substantially consists of a negative first lens group, a positive second lens group, a negative third lens group, a positive fourth lens group, and a positive fifth lens group in this order from the object side; wherein
| 05-14-2015 |
| 20150293335 | ZOOM LENS SYSTEM, OPTICAL APPARATUS AND METHOD FOR MANUFACTURING ZOOM LENS SYSTEM - A zoom lens system comprising, in order from an object side: a first lens group G | 10-15-2015 |
| 20150301320 | PROJECTION LENS AND PROJECTION DEVICE THEREOF - A projection device of projecting an image on a screen is disclosed. A projection lens of the projection device is disposed between the screen and an imaging unit of the projection device, to project light from a light source of the projection device on the screen. The projection lens includes a first lens group and a second lens group. The first lens group adjacent to the screen includes a first lens, a second lens and a third lens having negative diopter. The first lens is an aspheric lens adjacent to the screen. The second lens group adjacent to the imaging unit has positive diopter. An effective focal length of the projection lens represents f, a focal length of the first lends group represents f | 10-22-2015 |
| 20160041373 | PROJECTION OPTICAL SYSTEM AND IMAGE PROJECTION APPARATUS INCLUDING THE SAME - A projection optical system including a plurality of positive lenses and a plurality of negative lenses is provided. Values for an Abbe number and anomalous dispersion of materials for a positive lens and a negative lens arranged in a predetermined range from an enlargement conjugate side and values for the Abbe number and the anomalous dispersion of materials for a positive lens and a negative lens arranged in a predetermined range from a reduction conjugate side are appropriately set. | 02-11-2016 |
| 20160062093 | PROJECTION ZOOM LENS AND PROJECTION TYPE DISPLAY DEVICE - A projection zoom lens is essentially constituted by, in order from the magnification side: a negative first lens group, which is fixed when changing magnification; a positive second lens group, which moves when changing magnification; a plurality of other lens groups; and a final lens group, which is fixed when changing magnification. The distances among all adjacent lens groups change when changing magnification. The first through third lenses from the magnification side within the first lens group are a first single lens having an aspherical surface with a concave surface toward the magnification side and a negative refractive power in the paraxial region, a second single lens having an aspherical surface, and a third lens. A first lens group front group constituted by the first through third lenses has a negative refractive power. Predetermined conditional formulae are satisfied. | 03-03-2016 |
| 20160091699 | ZOOM LENS - A zoom lens includes a first lens group having negative refractive power, a second lens group having positive refractive power and a third lens group having positive refractive power. The second lens group is disposed between the first lens group and the third lens group. The second lens group includes at least an aspheric glass lens. Through using the aspheric glass lens, the imaging quality of the disclosed zoom lens is not sensitive to temperatures changes. | 03-31-2016 |
| 20160097919 | ZOOM LENS - A zoom lens is provided. The zoom lens includes a first lens group, a second lens group, a third lens group and an aperture stop. The second lens group is disposed between the first lens group and the third lens group. The aperture stop is disposed between the first lens group and the second lens group. When the zoom lens zooms, the aperture stop is fixed without moving and the first lens group correspondingly moves. | 04-07-2016 |
| 20160116734 | OPTICAL SYSTEM, IMAGE PICKUP APPARATUS, AND OPTICAL DEVICE - An optical system includes an aperture stop, a unit A configured to move during a distortion adjustment, and a unit B disposed at an image side relative to the unit A and configured to move with a locus different from a locus of the unit A during the distortion adjustment, the optical system changes from a first optical state having a first distortion to a second optical state having a second distortion larger than the first distortion, and focal lengths of the units A and B, moving amounts of the units A and B during a change from the first to second optical states, distances from the aperture stop to the units A and B, distances from a lens surface of the unit A closest to the object side to an image plane, and a total optical length of the optical system satisfy a predetermined condition. | 04-28-2016 |
| 20160124181 | WIDE ANGLE ZOOM LENS - A wide angle zoom lens includes sequentially from the object side, a first lens group having a negative refractive power overall and three lenses, including first to third lenses, having a negative refractive power and disposed farthest on the object side; a second lens group having a positive refractive power overall and one or more sets of cemented lenses; and a third lens group having a negative refractive power. This ultra wide angle zoom lens varies intervals between the first lens group, the second lens group, and the third lens group on the optical axis to zoom from the wide angle end to the telephoto end and satisfies given conditions to thereby enable a high zoom ratio, large diameter, and high resolution. | 05-05-2016 |
| 20160139382 | IMAGING OPTICAL SYSTEM FOR FORMING HIGH-DEFINITION IMAGE AND IMAGE PROJECTION APPARATUS HAVING THE SAME - An imaging optical system includes a first lens unit (B | 05-19-2016 |
| 20160139383 | ZOOM LENS FOR FORMING HIGH-DEFINITION IMAGE AND IMAGE PROJECTION APPARATUS HAVING THE SAME - A zoom lens includes, in order from an enlargement conjugate side to a reduction conjugate side, a first lens unit (B | 05-19-2016 |
| 20160139385 | OPTICAL SYSTEM, AND OPTICAL APPARATUS INCLUDING THE SAME - Provided is an optical system including, in order from an object side to an image side, a first lens unit and a second lens unit with a positive refractive power. One of lenses of the first lens unit is the closest to the object side and has a negative refractive power. The second lens unit includes an aperture diaphragm. One of lenses that is included in the second lens unit, located on the object side or the image side of the aperture diaphragm and the closest to the aperture diaphragm has a concave lens surface that faces the aperture diaphragm. Conditions are satisfied whose values are set by using refractive indexes of a negative lens and a positive lens of the first lens unit that respectively have the smallest Abbe number. | 05-19-2016 |
| 20160154224 | Projection Lens and Projector With Magnifying Function | 06-02-2016 |
| 20160170187 | ZOOM LENS | 06-16-2016 |
