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| Number | Title | Issue Date |
| 4348081 | Projection lens A projection lens for a cathode ray tube comprises three groups. The overall positive power of the lens is provided by the first and second groups. The third group of negative power primarily corrects for Petzval curvature. In one form, the second group c... | 09/07/1982 |
| 4310222 | Retro-focus type wide angle lens The present invention relates to a retro-focus type wide angle lens which is compact despite its remarkably large field of view and well compensated for various aberrations. This lens system consists of the first divergent lens group and the second conver... | 01/12/1982 |
| 4300817 | Projection lens A projection lens for cathode ray tube display comprising from the image end an element of relatively weak optical power a bi-convex element of positive power providing substantially all the positive power of the overall lens and a third group comprising ... | 11/17/1981 |
| 4293186 | Restricted off-axis field optical system This invention provides, in a restricted off-axis field optical system having a broad spectral range, which includes refracting elements, the improvement comprising: an optical system constructed and arranged so that the Petzval sum is substantially zero,... | 10/06/1981 |
| 4245891 | Zoom lens system with a movable distortion-correcting element A zoom lens system having a wide angle of view, a large diameter and a large zooming ratio in which the distortion is well corrected. The zoom lens system includes a movable lens group and a fixed lens group for zooming. A relay lens is provided behind th... | 01/20/1981 |
| 4241981 | Compact wide angle zoom lens A compact wide angle zoom lens in order from the object side, of a divergent front lens group and a convergent rear lens group, the overall focal length being variable by mechanical movement of the front and rear lens groups. The divergent front lens grou... | 12/30/1980 |
| 4204191 | Lighting system for bicycles A lighting system for bicycles and the like which incorporates forwardly and rearwardly mounted lighting assemblies. Each of these assemblies includes right and left turn indicator lamps mounted within housings each having an outwardly directed lenticulat... | 05/20/1980 |
| 4196968 | Wide angle zoom lens system A miniaturized, super-wide angle zoom lens system of the two lens group type wherein barrel shaped distortion aberration in the wide angle position is compensated for by providing one of the lenses with an aspherical surface.... | 04/08/1980 |
| 4171872 | Compact four element afocal lens A compact substantially afocal lens comprising two components each including two elements adapted for use as a magnifying attachment for an objective with an internal stop. Compactness in an afocal lens of good performance is obtained by the use of a stro... | 10/23/1979 |
| 4163604 | Projection lens A three element lens particularly adapted to project an image appearing on a cathode ray tube.... | 08/07/1979 |
| 4159865 | Zoom lens system A zoom lens system comprising from front to rear a first lens group of negative power and a second lens group of positive power with the axial separation therebetween being variable for zooming purposes. The first lens group is provided with a non-spheric... | 07/03/1979 |
| 4153339 | Zoom lens In a zoom lens consisting of a first lens group having a negative refractive power and a second lens group having a positive refractive power with the air separation between the first and second groups being variable for zooming, there are provided two no... | 05/08/1979 |
| 4151752 | Device for the excitation of waves and especially ultrasonic waves including a cell The device comprises a lens and a source for emitting a beam of parallel light rays or ultrasonic rays at right angles to a flat dioptric element. The lens surface which is located opposite to the radiation-emitting source is flat and the lens surface loc... | 05/01/1979 |
| 4133600 | Method of manufacturing and utilizing holographic lens means Holographic lenses are formed on a substantially transparent scanning disc wherein a line focus is the object for each hologram. Such hologram is then used to reconstruct the line focus at the location of the record to be scanned, thereby alleviating tole... | 01/09/1979 |
| 4111558 | Retrofocus type wide angle objective lens A retrofocus type wide angle objective lens comprising from front to rear a diverging first lens component having a non-spherical surface formed therein, a converging second lens component, a diaphragm, and a converging third lens component, whereby the s... | 09/05/1978 |
| 4099846 | Variable magnification lens system In a variable focus objective an axial air space between a negative front lens and a positive rear lens component is variable for zooming. The first component is movable for focusing independently of the rear component and provided with a variable air spa... | 07/11/1978 |
| 4094585 | Loupe A magnifier or loupe of high magnifying power comprising a positive singlet followed by a cemented doublet in the overall form of a meniscus having bi-convex and bi-concave elements. The cemented surfaces, the outer surfaces of the doublet, or both may be... | 06/13/1978 |
| 4086000 | Viewfinder optics with zero power doublet A chromatically neutral viewfinder optical system of positive forward and rearward elements and including therebetween a substantially zero power doublet which neutralizes chromatic errors generated by the positive elements.... | 04/25/1978 |
| 4027944 | Illuminated system for vertical fluorescent microscopy A vertical illuminator for imaging a light source at the back aperture of a microscope objective for use in fluorescent microscopy has a light source, an axially-movable positive meniscus lens which has an aspheric convex surface, a positive biconvex lens... | 06/07/1977 |
| 3999840 | Wide angle objective having a non-spherical surface A retrofocus wide angle objective with the backfocal length being at least two times the overall focal length, comprising in optical alignment, a plurality of negative meniscus lenses of forward convexities, a positive lens, a negative meniscus lens of fo... | 12/28/1976 |
| 3992085 | Large aperture wide angle lens system employing an aspherical surface A large aperture wide angle lens which employs such aspheric surfaces as satisfying the condition of wherein one plane out of the lens group at rear of the diaphragm of a retro-focus type objective lens is made aspheric surface, and the paraxial curvature... | 11/16/1976 |
| 3967884 | Three element objective lens An objective lens comprising a front positive meniscus element, a middle negative biconcave element and a rear positive biconvex element. Improved optical performance at a relative aperture of f/1.70 is achieved by the incorporation of an asphere on the r... | 07/06/1976 |
| 3958864 | High power photographic objective with large angular field A high power lens for photograhic purposes, having a relatively large angular field. The lens has at least seven air spaced members, at least three of which are behind a central vertex space, those members in front of such space being divided into two gro... | 05/25/1976 |
| 3936154 | Short focal length large aperture optical system This invention relates to a short focal length, large aperture optical system primarily designed to efficiently transmit light rays to an image plane with an extraordinarily high degree of correction over a prescribed field.... | 02/03/1976 |
| 3932148 | Method and apparatus for making complex aspheric optical surfaces Complex aspheric optical surfaces may be made reliably and relatively rapidly by a method in which one surface of a relatively thick glass block is ground and polished to the desired aspheric surface, which may be tested in a system including master optic... | 01/13/1976 |
