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| Number | Title | Issue Date |
| 5069542 | Contact lens A contact lens has an elliptical inside surface with a numerical eccentricity of 0.2 to 0.5 and a zenith radius of curvature of 8.0 to 8.4 mm. The inside surface preferably has a peripheral, circularly cross sectioned bevelled zone. As a soft contact lens... | 12/03/1991 |
| 5009497 | Contact lenses utilizing keel orientation The invention relates to a variety of contact lens designs which attempt to achieve a stable lens orientation by providing such contact lenses with approximately circular profiled grooves or channels. These profiled tracks act as circular keels inhibiting... | 04/23/1991 |
| 4865435 | Optical system for rangefinding devices An optical lens system for a rangefinding device consists of from the object end a first lens with a convex surface directed to the other end and a second meniscus lens with a convex surface directed to the object end. The optical lens system has at least... | 09/12/1989 |
| 4863248 | Single collimator lens A collimator lens of a single lens type having a convex aspherical surface on the collimated light side and a plane surface on the condensed light side fulfills the following conditions: ##EQU1## wherein f represents a focal length of the collimator ... | 09/05/1989 |
| 4861145 | Small-size zoom lens of widely variable magnification A zoom lens comprises successively in order from an object toward an image, a first lens group having positive refracting power, a second lens group having negative refracting power, a third lens group having positive refracting power, a fourth lens group... | 08/29/1989 |
| 4861153 | Progressive addition spectacle lens In the embodiments of the bipolar progressive power ophthalmic lens described in the specification, the constant power distance portion and reading portion regions of the progressive power surface are reduced to mathemtical points and the surface astigmat... | 08/29/1989 |
| 4859041 | Variable focus optical device A variable focus optical device comprises a plurality of elastic bodies laminated in the optical axis direction and a driving member having an opening provided on said elastic bodies and being capable of deforming the surfaces of said elastic bodies by ap... | 08/22/1989 |
| 4859049 | Contact lens for oriented optical corrections The contact lens comprises a central optical zone and a peripheral zone for fastening the lens. For centering said lens the peripheral zone comprises two stabilizing bosses which are disposed on the horizontal stabilization axis of the lens. For large pal... | 08/22/1989 |
| 4859040 | Optical system having gradient-index lens and method for correcting aberrations An optical system comprising a plurality of lens components, wherein at least one of the components is a convex lens and has a radial gradient of refractive index in such a cross section that the refractive index increases toward the margin, so that it be... | 08/22/1989 |
| 4856889 | Uniform strength ophthalmic lens having a gradient refractive index changing rotation-symmetrically about the optical axis and method of making it A uniform strength ophthalmic lens having a gradient refractive index changing rotational-symmetrically about the optical axis in which the curvature course of at least one of the two surfaces of the ophthalmic lens is selected without consideration of co... | 08/15/1989 |
| 4856881 | Photographic lens of long back focal length A photographic lens of long back focal length comprising, from front to rear, a first lens unit of negative refractive power, the first lens unit including a first lens of positive refractive power whose front surface is convex toward the front, a meniscu... | 08/15/1989 |
| 4854682 | Compact high vari-focal ratio zoom lens system A compact high vari-focal lens system permitting simplifying the lens barrel structure and having favorable performance; comprising a first lens group having positive refractive power, a second lens group having positive refractive power and a third lens ... | 08/08/1989 |
| 4854680 | Zoom view finder A zoom view finder comprising a plural number of lens units and so adapted as to perform zooming by displacing some of said lens units, said zoom view finder satisfying the following conditions: ##EQU1## wherein the reference symbol z represents zoom... | 08/08/1989 |
| 4850689 | Near vision contact lens and methods of making and using it A near vision contact lens has a generally elliptical body of concavo-convex cross-sectional configuration with interior and exterior curvatures providing the desired power from the bottom to the extreme upper edge. The rounded ends of the body are so pos... | 07/25/1989 |
| 4848894 | Contact lens with laser protection A contact lens is made either with a laser-reflecting or absorbing layer edded in a transparent optical lens material, or formed as a layer on the convex side of such a material. The layer may be a Fabry-Perot reflector or a thin-film or holographically ... | 07/18/1989 |
| 4848883 | Telephoto zoom lens system having four lens groups A four-group type telephoto lens system including a super-telephoto range having a viewing angle (2ω) of less than 8° and which includes a focusing lens in a first lens group. The lens system includes for lens groups. The first group is composed of a fi... | 07/18/1989 |
| 4844600 | Zoom lens system A zoom lens system with a focusing system other than a front group focusing system is provided. The lens system comprises a first lens group including at least two sub-groups with a variable air space therebetween to be varied during zooming, and a focusi... | 07/04/1989 |
| 4844598 | Light focusing lens with centrally disposed light intercepting member A lens for collecting solar rays or artificial light rays having light rays' component near to that of the solar rays. In particular, the lens capable of effectively separating and focusing only the light component of a desired wave length among the solar... | 07/04/1989 |
| 4842393 | Cuspated lens A cuspate lens is disclosed having a slope magnitude which decreases from a maximum at a central cusp to a minimum at the periphery. A radially symmetric version of the lens can focus light into a ring, or produce an annular beam. Also disclosed are a fib... | 06/27/1989 |
| 4842388 | Single optical lense with diffraction limit converging capability and wide field angle A single lens having first and second aspherical surfaces each having a positive power is usable for, an objective lens of an optical pickup for an optical recording medium. The lens satisfies the following conditions: where m denotes magnification; d denotes ... | 06/27/1989 |
| 4840455 | 3-dimensional optical viewing system An optical viewing system for producing a 3-dimensional effect is arranged to project two different and separated views of an object simultaneously along different optical paths onto opposite halves of a retina of a viewer's eye, or onto both eyes of a vi... | 06/20/1989 |
| 4840465 | Device for correcting distortion Device for correcting the differential distortion resulting from simultaneous observation of a field of view at two distinct locations through a shield transparent in a given spectral band, which shield has a shape generating the distortion when a receive... | 06/20/1989 |
| 4840467 | Compact zoom lens system with a high zooming ratio A compact zoom lens system with a high zooming ratio comprises, in order from the object side, a first lens group having a positive refracting power, a second lens group having a positive refracting power and a third lens group having a negative refractin... | 06/20/1989 |
| 4840472 | Reflecting/refractive optical system A long focal length, super-large aperture ratio reflecting/refractive optical system employing easily workable spherical surfaces and which is suitable for use in an astrocamera or a super-telephoto lens system. The lens system includes four optical units... | 06/20/1989 |
| 4840478 | Method and article of manufacture for inserting contact lens The specification teaches a method of applying contact lenses to human eyes by sensitizing the fingers and applying the lenses to the eyes by sense of touch. Also taught are several preferred embodiments of means for sensitizing and cleaning the fingers w... | 06/20/1989 |
| 4840477 | Dyed color change contact lens A cosmetic contact lens that changes the apparent color of the eye. The lens will change a dark brown eye to light blue or green. This color change is accomplished by having a transparent dyed iris area on the convex lens surface. A light reflecting mater... | 06/20/1989 |
| 4838667 | Zoom lens system for use in microfilm projection apparatus A zoom lens system for use in microfilm projection apparatus in which the image projection is conducted in a condition of a definite object-image distance, the system comprising from the enlargement side to the reduction side, a first lens group of a posi... | 06/13/1989 |
| 4838674 | Multifocal ophthalmic lens In this lens, the curvature of the main meridian curve of power progression (MP) begins to vary from a point (A3) situated within the intermediate vision zone (VI) at a predetermined distance d1 from the point (A1) on the main meridian curve (MP) situated... | 06/13/1989 |
| 4836661 | Optical system of variable magnification power In the disclosed optical system of variable magnification power, at least one component A of two components A and B has its refractive power varied so that the focal length of the entire system can be continuously varied throughout a range while maintaini... | 06/06/1989 |
| 4836665 | Objective lens An objective lens having a stop provided most adjacent to the image side comprises, in succession from the object side, a first lens which is a positive meniscus lens having its convex surface facing the object side, a second lens which is a biconcave len... | 06/06/1989 |
| 4834512 | Three-dimensional display A three-dimensional display is disclosed which uses a variable focal length lens through which two-dimensional images of an object are viewed. In one embodiment, a sequence of different images representative of cross sections of the object along its depth... | 05/30/1989 |
| 4832470 | Inverted galilean telescope type viewfinder system capable of changing over the magnification A viewfinder system capable of changing over the magnification includes an objective lens unit having at least two negative lens elements replaceable with each other for magnification change-over, and an eyepiece unit having a positive refractive power an... | 05/23/1989 |
| 4832471 | Zoom lens A zoom lens including, from front to rear, a first lens unit of positive power for focusing, a second lens unit of negative power having the function of varying the image magnification, a third lens unit of negative power for compensating for the image sh... | 05/23/1989 |
| 4832465 | Zoom lens for use in copying A zoom lens comprising a first and a second lens component that are related to each other for zooming. The first lens component consists of four lens elements and has a positive focal length fI satisfying the condition 0.35 | 05/23/1989 |
| 4830477 | Zoom lens capable of obtaining focal lengths beyond a variable focal length range A zoom lens comprising, from front to rear, a first zoom section and a second zoom section, the first zoom section having a plurality of movable lens units which simultaneously move to effect zooming, and the second zoom section having a plurality of axia... | 05/16/1989 |
| 4830481 | Multifocal diffractive lens A multifocal ophthalmic lens has a plurality of concentric diffractive zones with adjacent zones separated by steps having predetermined heights. Each step has an outer corner and each outer corner has a radius of curvature equal to at least one half the ... | 05/16/1989 |
| 4826301 | Photographic system having soft focus function A photographic objective having a soft focus function comprising, from front to rear, a first lens component of positive power, a second lens component having a meniscus-shaped lens of forward convexity, an aperture stop, and a third lens component, the s... | 05/02/1989 |
| 4826299 | Linear deiverging lens A new type of lens is described. The lens has the appearance of a prism with a relatively sharp radius at the apex. This lens finds an application in expanding a laser beam in one direction only.... | 05/02/1989 |
| 4824223 | Projection objective with variable focal length A projection objective with variable focal length is provided, consisting of a front member (F) with negative refractive power and a multiple-lens basic objective (G) with positive refractive power, between which a multiple-lens variator (V) displaceable ... | 04/25/1989 |
| 4824227 | Optimum riser angle for fresnel lenses in projection screens a Fresnel lens for use in rear projection screens wherein said lens has a plurality of facets facing away from the light source and each of said facets has an optimal riser angle, said riser angle varying from the center to the outer edge of said lens as ... | 04/25/1989 |
