Abstract: There is provided a lens module, including: a first lens having positive refractive power, an object-sided surface thereof being convex; a second lens having negative refractive power, an image-sided surface thereof being concave; a third lens having positive refractive power; a fourth lens having negative refractive power, an image-sided surface thereof being convex; and a fifth lens having negative refractive power, an image-sided surface thereof being concave, wherein the fourth lens satisfies Conditional Expression 1, f ? ? 4 f < - 3.0 [ Conditional ? ? Expression ? ? 1 ] where f is an overall focal distance of an optical system and f4 is a focal distance of the fourth lens.

Abstract: The invention relates to a method for improving the imaging properties of a micro lithography projection objective, wherein the projection objective has a plurality of lenses between an object plane and an image plane, a first lens of the plurality of lenses being assigned a first manipulator (ml, Mn) for actively deforming the lens, the first lens being deformed for at least partially correcting an aberration, at least one second lens of the plurality of lenses furthermore being assigned at least one second manipulator, and the second lens being deformed in addition to the first lens. Furthermore, a method is described for selecting at least one lens of a plurality of lenses of a projection objective as actively deformable element, and a projection objective.

Abstract: An imaging lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. The imaging lens assembly has five non-cemented lens elements with refractive power and further includes a stop located between an imaged object and the first lens element. The first lens element with positive refractive power has a convex object-side surface. The second through fifth lens elements all have refractive power. The third lens element has a convex image-side surface. The fifth lens element has a concave image-side surface at a paraxial region thereof, wherein the image-side surface of the fifth lens element has a convex shape at a peripheral region thereof, and both of an object-side surface and the image-side surface of the fifth lens element are aspheric.

Abstract: Provided is a lens barrel including: a guide shaft in an axial form supported by a reference member; a holding member holding an optical system, and movable in an axial direction of the guide shaft with respect to the reference member; and an interlocking member including an engaging section engaging with the holding member, the interlocking member moving in the axial direction while rotating around an optical axis of the optical system, and moving along the guide shaft without rotating the holding member. The lens barrel may include a driving cylinder including a cam groove engaging with the interlocking member, where when rotated around the optical axis, the driving cylinder drives the interlocking member by means of the cam groove, to cause the interlocking member to move linearly in the direction of the guide shaft.

Abstract: Aspects of the present invention provide a lens comprising a non-rotationally symmetric aspheric optical element, surface or feature and a rotationally symmetric aspheric optical element, surface or feature. The non-rotationally symmetric aspheric optical feature can be a progressive power region. The non-rotationally symmetric aspheric optical feature and rotationally symmetric aspheric optical feature can be in optical communication when located on different surfaces of a lens or can be collapsed to occupy a single surface of a lens. The non-rotationally symmetric aspheric optical feature and rotationally symmetric aspheric optical feature can each contribute to the add power of a lens. Distortion (e.g., astigmatism) of a lens of the present invention can be reduced (e.g., globally and/or locally) by optically combing the non-rotationally symmetric aspheric optical feature with the rotationally symmetric aspheric optical feature.

Abstract: 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.

Abstract: An imaging lens includes a first lens group having negative refractive power; a stop; and a second lens group having positive refractive power, arranged in the order from the object side to the image plane side. The first lens group includes a first lens having a strong concave surface facing the image plane side and negative refractive power; and a second lens having negative refractive power and a biconcave lens shape near the optical axis. The second lens group includes a third lens having a biconvex shape; and a lens group that is composed of a lens having positive refractive power and a lens having negative refractive power, and has negative refractive power as a whole. The first lens group has a focal length F1 and the second lens group has a focal length F2 so that the following conditional expression is satisfied: ?1.0<F1/F2<?0.5.

Abstract: An optical lens assembly for image pickup, sequentially arranged from an object side to an image side along the optical axis, comprising: the first lens element with negative refractive power has a convex object-side surface and a concave image-side surface; the second lens element with positive refractive power has bi-convex surfaces; and the third lens element with negative refractive power, made of plastic, and which has a convex object-side surface and a concave image-side surface with at least one thereof is aspheric. By such arrangements, the optical lens assembly for image pickup satisfies conditions related to shorten the total length and to reduce the sensitivity for use in compact cameras and mobile phones with camera functionalities.

Abstract: An apparatus to modify an incident free space electromagnetic wave includes a block of an artificially structured material having an adjustable spatial distribution of electromagnetic parameters (e.g., ?, ?, ?, ?, and n). A controller applies control signals to dynamically adjust the spatial distribution of electromagnetic parameters in the material to introduce a time-varying path delay d(t) in the modified electromagnetic wave relative to the incident electromagnetic wave.

Abstract: The present invention provides an electrolyte for electrochromic devices, the substance comprising ?-butyrolactone (gamma-butyrolactone or GBL). The electrolyte may include polymethylmethacrylate. The electrolyte may further include a salt, such as a salt that includes lithium perchlorate or trifluorosulfonimide. In accordance with further aspects to the invention, the electrolyte may include propylene carbonate.

Abstract: Contact lens designs are provided with improved stabilization wherein the moments of momentum are balanced.

Abstract: An imaging optical system smaller than conventional systems yet with well-corrected aberrations, comprises five lenses L1-L5 having refractive powers, in order from the object side: positive, negative, positive, positive, and negative, with an aperture at an endmost object-side position. In one embodiment, L1 is biconvex, L2's object-side surface is convex, L5's object-side surface is convex, and 1.0?f3/f1?4.9, f1 and f3 being the focal lengths of L1 and L3, respectively. In a variant thereof, L2 is a meniscus lens and L5's object-side surface is concave. In another embodiment, L1 is glass, and ?4.0<(r6+r7)/(r6?r7)<?0.51, r6 and r7 being paraxial curvature radii of L3's object-and image-side surfaces, respectively. In another embodiment, L1 is glass, and ?1.5<f2 /f<?0.73, f2 being the focal length of L2 and f the focal length of the whole optical system. In yet another embodiment, L1 is glass, and ?11.2<r3/f1<?0.9, r3 being the paraxial curvature radius of L1's image-side surface.

Abstract: Adjustable focus eyeglasses where the range of adjustment can be moved. That is, if a pair of adjustable focus eyeglasses have a range of 0 diopters to 2.75 diopters (to provide a 2.75 D ADD for reading for an emmetrope), this invention could, for example, permit the user to move the range from 0 D to 2.75 D to 2.00 D to 4.75 D so as to accommodate a short term change in the user's distance vision requirement. Each eye can be adjusted independently.

Abstract: A progressive-power lens has one surface which satisfies the following expressions CY(DP)=CT(DP) CY(P)>CT(P) where CT(DP) denotes a vertical direction curvature at the distance reference point, CY(DP) denotes a horizontal direction curvature, CY(P) denotes a horizontal direction curvature at a point on the principal meridian which is located further on the near portion than the progressive start point, and CT(P) denotes a vertical direction curvature at the point.

Abstract: A method and apparatus for producing a first spectacle lens of a pair of spectacle lenses to be used with a second spectacle lens for a specific situation of wear, in which optical parameters for the spectacle lens are calculated to minimize the value of a target function that corresponds to the pair of spectacle lenses. The target function is the sum of a first monocular function, with a weighting factor, that depends on the values of a first monocular optical property at a plurality of monocular evaluation points, a the binocular function, with a weighting factor, that depends on the values of a second monocular optical property at the plurality of pairs of binocular evaluation points, and a remainder term.

Abstract: Light from an exit pupil of an illumination unit is directed to a beam splitter which directs the light to an objective. The retina is illuminated, if a real image of the exit pupil of the illumination unit and a real image of an entrance pupil of a camera unit are formable. The objective forms a real intermediate image of the retina between the objective and the camera unit. The beam splitter directs the light from the retina to the camera unit, while causing the path of the illumination and the path of the imaging to deviate for non-overlapping images of the exit pupil and the entrance pupil in the crystalline lens. A relay lens system forms a real image of the intermediate image on a detecting component with the light reflected from the retina for transforming the image into an electric form to be shown on a screen.

Abstract: A system for performing at least one of quasi-elastic light scattering and fluorescent ligand scanning on a subject's eye includes a light source configured to transmit light toward the subject's eye, a lens configured to focus light sent from the source and received from the subject's eye, a measurement reflector disposed to receive at least a portion of the focused light and configured to reflect a first portion of the received light, a camera configured and disposed to receive the first portion of the received light and configured to provide indicia of an image corresponding to the first portion of the received light, and a processor coupled to the camera and configured to analyze intensities of light in the image to determine a location of a reference point corresponding to an interface of a portion of the eye.

Abstract: An axially symmetric, bifocal, non-progressive ophthalmic lens which, in a smooth pathway between a distant vision field and a near vision field, has no perceptible progression of power, dividing line, image jump, nor other optical distortion.

Abstract: Disclosed is a motor for driving lenses. The motor includes a case, a yoke fixed in the case, a magnet fixed in the yoke, a carrier equipped with lenses and installed in the magnet such that the carrier moves up and down within the magnet, a coil coupled with the carrier, a spring unit including first and second springs having arc shapes and being separated from each other while forming a ring shape as a whole, a spacer supporting an outer peripheral surface of the spring unit, and a terminal provided on the spacer, in which one side of the terminal protrudes downward by passing through a bottom of the case to make connection with the spring unit and a main PCB of a product.

Abstract: An arrangement for fluorescence microscopic examination of specimens includes: a fluorescence microscope; an illumination device that includes: a housing including an interface configured to optically couple the housing and the fluorescence microscope; a plurality of light-emitting diodes disposed in the housing; a respective collector disposed downstream of each of the light emitting diodes and configured to generate a directed light flux; and at least one dichroic splitter disposed in the housing, the at least one splitter and the light-emitting diodes being spatially disposed with respect to one another so that the directed light fluxes are combinable via the at least one splitter into a common illumination beam path directed onto the interface; and a logical control device common to the fluorescence microscope and the illumination device.