Abstract: In the beam path of an Optical Cross Connect between the front face of a fiber block and a moveable mirror array are placed a telecentric lens and multi-surface optical element. The lens is placed adjacent the front face with a front focal plane coinciding with the front face. The substantially parallel beam path axes between the front face and the telecentric lens are converted by the lens into dispersing directions towards the optical element. Discrete optical surfaces of the optical element redirect the dispersing beam paths in a fashion such that the beam paths coincide in the following with corresponding moveable mirrors of a mirror array. Pitches of arrayed fiber ends and of the optical surfaces as well as the moveable mirrors are independently selectable. The telecentric lens simultaneously focuses the signal beams with improved beam separation and reduced signal loss.

Abstract: A zoom lens includes, in order from an object side to an image side, a first lens unit of positive refractive power, a second lens unit of negative refractive power arranged to move during variation of magnification, a third lens unit arranged to compensate for shift of an image plane due to the variation of magnification, and a fourth lens unit of positive refractive power, wherein the fourth lens unit has a first lens subunit of negative refractive power, and an image is displaced by moving the first lens subunit in such a way as to have a component perpendicular to an optical axis of the zoom lens.

Abstract: An optical apparatus is disclosed which comprises an optical system provided with a zoom lens for performing zooming by moving along the optical axis and a focus lens for performing correction and focusing at the time of zooming, an imaging device for imaging an optical image supplied from the optical system, a zoom actuator for driving the zoom lens, a focus actuator for driving the focus lens, a zoom position detecting device for detecting the position of the zoom lens, a focus position detecting device for detecting the position of the focus lens, an aperture stop member whose opening diameter changes so as to adjust the luminous energy passing through the optical system a filter member to be freely inserted into or extracted from the optical path of the optical system, an aperture stop state detecting device for detecting the opening state of the aperture stop member, a filter state detecting device for detecting the insertion state of the filter member, a memory storing the movement information on the re

Abstract: A viewing lens that is divided into at least three sections such that a wearer can see through a center section with both eyes, and can see through a lateral section only with the eye immediately adjacent to that section.

Abstract: A zoom lens system includes a positive first lens group, a negative second lens group. Zooming is performed by moving the first and second lens groups in the optical axis direction thereof. The most image-side lens element of the positive first lens group includes a positive lens element having at least one aspherical surface. The zoom lens system satisfies the following conditions: 4.5<fT/f1G<5.5 ??(1) 3.5<fT/fLasp<5.5 ??(2) wherein fT designates the focal length of the zoom lens system at the long focal length extremity; f1G designates the focal length of the positive first lens group; and fLasp designates the focal length of the positive lens element having the aspherical surface in the positive first lens group.

Abstract: A zoom lens system includes a negative first lens group, a positive second lens group, and a positive third lens group. Upon zooming from the short to long focal length extremities, the distance between the first and second lens groups decreases, and the distance between the second and third lens groups increases. The zoom lens system satisfies the following conditions: 0.4<(fw·ft)1/2/|f1|<0.8(f1<0)??(1) 0.7<(fw·ft)1/2/f2<1.4??(2) 0.4<(fw·ft)1/2/f3<0.9??(3) wherein fw and ft designate the focal lengths of the entire zoom lens system at the short and long focal length extremities, respectively; and fi designates the focal length of the ith lens group (i=1˜3).

Abstract: A zoom lens system includes a negative first lens group, a positive second lens group, and a positive third lens group. The negative first lens group includes a negative meniscus lens element having the convex surface facing toward the object, and the positive third lens group includes a positive biconvex lens element. Upon zooming, at least the negative first lens group and the positive second lens group are moved. A diaphragm is provided on the object side of the positive second lens group, and moves integrally therewith. The zoom lens system satisfies the following conditions: 0.25<R1/D1<0.55 . . . (1); 0.25<f2/TL<0.45 . . .

Abstract: An eyepiece (2) for viewing a flat image, which eyepiece (2) has a wide field of view and which eyepiece (2) comprises a cemented doublet of reflecting and refracting optical components, the reflecting and refracting optical components being such that they are each of a different refractive index whereby chromatic aberrations and spherical aberrations are reduced.

Abstract: Disclosed is a transparent polymeric film having a top and bottom surface comprising a plurality of complex lenses on at least one surface thereof and containing as its primary ingredient a polymer sufficient to impart to the film a light transmission of at least 92% based on a film thickness of 125 micrometers.

Abstract: An objective has lens units, each of which is constructed with single lenses, and a numerical aperture of 0.7 or more, comprising, in order from the image side, a first lens unit including a positive meniscus lens with a convex surface facing the image side, at least two negative lenses, and at least two positive lenses, and having negative power as a whole; a second lens unit including a negative lens and a positive lens so that the radius of curvature of the surface of the negative lens, adjacent to the positive lens, is smaller than that of the opposite surface thereof; a third lens unit including biconvex positive lenses and biconcave negative lenses which have different media, so that two of the biconvex positive lenses are arranged on the object side and the image side, and having positive power as a whole; and a fourth lens unit including a negative meniscus lens and at least one positive meniscus lens, and having positive power as a whole.

Abstract: A series of optical elements is used to produce multiple simultaneous adjoining images on a single image plane. A first, intermediate, image is produced using the first telecentric imaging lens. This intermediate image is produced at a plane coincident with an adjustable-size rectangular field stop. The rectangular field stop is mounted in a sub-housing that allows its free rotation. A second telecentric lens collimates the light from the intermediate image. This collimated light is next passed through an optical splitting means, which uses the principal of refraction to separate the light into multiple components. The optical splitting means is mounted in a sub-housing that allows its free rotation. From here, the light next passes through a third and final lens, which produces a second, final, image on a single, planar detection device. The final image consists of a plurality of identical copies of the intermediate image.

Abstract: The difference in optical performance, such as astigmatism, the radius of curvature of a first surface, etc., of left and right lenses is kept at or below a specific level, and the difference in optical performance and the radius of curvature of the first surfaces between new and old lenses when the wearer changes lenses is also kept at or below a specific level, the result being lenses that are more comfortable to wear and are more attractive.

Abstract: An autofocus system for an imaging device that includes an image detecting element for image production at a focused image plane of an adjustable focus imaging lens that also includes four image detecting elements for focus detection arranged in pairs that are equidistant in front of, and behind, planes that are conjugate with the focused image plane. One pair of image detecting elements for focus detection are farther than the other pair from the conjugate planes and may be used alone for focusing based on the stop value or focal length of the adjustable focus imaging lens. Alternatively, the other pair of image detecting elements may be used for more accurate focusing after the one pair of image detecting elements is used. The use of two pairs of image detecting elements at different distances from the focused image plane provides accurate focusing over a wide range of object distances.

Abstract: Apparatus and methods for reducing optical distortion in an optical system by thermal means are disclosed. The apparatus includes a heating/cooling system spaced apart from and in thermal communication with an internally reflecting surface of a refractive element in the optical system. The heating/cooling system is adapted to create a select temperature distribution in the refractive optical element near the internally reflecting surface to alter the refractive index and/or the surface profile in a manner that reduces residual distortion.

Abstract: An optical lens including an optically clear lens element; and a light absorbing coating on a surface of the lens that attenuates transmitted light; has a coloured or colourless reflection as seen from the front of the sunglass lens; and is anti-reflective as seen from the eye side of the lens.

Abstract: A zoom lens system includes a positive first lens group and a negative second lens group which move in an optical axis direction upon zooming. The positive first lens group includes a positive first lens element having a convex surface on the object side, a negative second lens element, and a positive third lens element. The negative second lens group includes a positive meniscus lens fourth lens element having the concave surface facing toward the object, and a negative meniscus fifth lens element having the concave surface facing toward the object. The following conditions (1), (2) and (3) are satisfied: 1.2<ft/f1<1.8  (1); 3.8<ft/f1G<4.2  (2); and  1≦SF1<6; wherein ft designates the entire focal length at the long focal length extremity; f1 designates the focal length of the positive first lens element; f1G designates the focal length of the positive first lens group, and SF1 designates the shape factor of the positive first lens element.

Abstract: A zoom lens system has, in order from an enlargement side, a first lens unit having negative optical power, a second lens unit having positive optical power, a third lens unit having positive optical power, a fourth lens unit having negative optical power, including an aperture stop, a fifth lens unit having positive or negative optical power, and a sixth lens unit having positive optical power. Zooming is achieved by varying the first to fifth variable distances between the lens units. The third and fifth lens units move from the enlargement side to the reduction side during zooming from the telephoto end to the wide-angle end. The zoom lens system is substantially telecentric toward the reduction side.

Abstract: A system and method for designing a progressive lens. Mean power is specified at points distributed over the entire surface of the lens and lens height is specified around the edge of the lens. Lens height is determined at the points consistent with the specified mean power and the lens edge height in part by solving a partial differential equation of the elliptic type subject to the lens edge height as a boundary condition. A successive over-relaxation technique may be employed to converge on the solution to the partial differential equation, and an over-relaxation factor may be determined to most efficiently relax the equation.

Abstract: The disclosed zoom lens includes a first lens unit having a negative optical power, a second lens unit having a positive optical power, and a third lens unit having a positive optical power in order from an object side to an image side. The zoom lens has a shorter interval between the first lens unit and the second lens unit and a longer interval between the second lens unit and the third lens unit on a telephoto end than an interval between the first lens unit and the second lens unit and an interval between the second lens unit and the third lens unit on a wide angle end, respectively.

Abstract: A five-group zoom lens is formed of, in order from the enlarging side of the zoom lens, a negative first lens group that is movable for focusing and that is stationary during zooming, a positive second lens group, a positive third lens group, a negative fourth lens group, and a positive fifth lens group that is stationary during zooming. The second lens group, the third lens group, and the fourth lens group move relative to one another and relative to the first and fifth lens groups during zooming. The second lens group includes a negative lens component that has a concave lens surface on the reducing side of the zoom lens. The zoom lens satisfies various conditions and may be used in a projection display device or an image pickup device such as a camera.