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| Number | Title | Issue Date |
| 5042929 | Projection lens and projection system A projection lens enlarges and projects optical images in a matrix type light valve onto a screen. The projection lens includes a front lens group of the retrofocusing type; a rear lens with aspherical surfaces whose radii of curvature in the peripheral p... | 08/27/1991 |
| 5039212 | Zoom lens for variable magnification copying machine A zoom lens for a variable magnification copying machine has a first lens composed of a concave lens; a second lens composed of a convex lens; a third lens composed of a meniscus concave lens and having a concave face on an object side; a diaphragm; a fou... | 08/13/1991 |
| 4989961 | Projection lens systems for use in projection television A projection lens system including seven lens elements for use in a projection television which comprises, in order from the screen side, a first lens unit composed of a positive lens element, a second lens unit composed of an aspherical lens element made... | 02/05/1991 |
| 4812027 | Gauss type near focus lens A Gauss type rear focus lens includes a forward group having, in succession from the object side, a first lens component having its convex surface facing the object side and having a positive refractive power, a second lens component comprised of at least... | 03/14/1989 |
| 4776681 | Projection lens A projection lens for a cathode ray tube consisting from the image end of a first lens unit including an element of overall meniscus shape and of positive power at the optical axis, a second lens unit which includes of a biconvex element and supplies the ... | 10/11/1988 |
| 4765727 | Color-corrected lens systems A method is described for selecting optical materials to use in designing color-corrected optical systems. Various dioptric, catadioptric and anamorphic optical systems are described, which use only two different types of optical materials to obtain preci... | 08/23/1988 |
| 4747675 | Ultra wide-angle eyepiece Ultra wide-angle eyepieces with relatively long focal lengths and minimal spherical aberration of the exit pupil and field curvature. The eyepieces use six elements in a positive power lens group and two elements in a negative power lens group.... | 05/31/1988 |
| 4705364 | Wide angle lens A wide angle lens having a long back focus substantially equal to the rear focal length of the total lens system comprising six lens components with a stop between the third and fourth components from the object side satisfies the conditions: wherein f is... | 11/10/1987 |
| 4682862 | Projection lens A projection lens system adapted to project an image from a cathode ray tube and consisting from the image end of a first lens unit of weak optical power, a second lens unit of strong optical power including a biconvex glass element, a third lens unit of ... | 07/28/1987 |
| 4553823 | Large relative aperture objective lens A large relative aperture objective lens having three lens groups of positive power with said three lens groups being all moved forward to effect focusing from an infinitely distant object to close objects. The three lens groups, being named from front to... | 11/19/1985 |
| 4542954 | Wide angle lens for the infrared dedicatory clause This rotationally symmetric optical sensor consists of six lens elements e selectively of the alkali halide materials KBr, C I, and KI. It has a wide field-of-view coverage of 60 degrees and operates in the middle infrared through the far infrared bands ... | 09/24/1985 |
| 4537472 | Objective lens system for microscopes An objective lens system for microscopes designed for a magnification level of 60X and NA of 1.4, excellent in contrast and resolution, and comprising a first cemented doublet component comprising a plano-convex lens element and a meniscus lens element ha... | 08/27/1985 |
| 4494829 | Curved field photographic objective The invention provides a highly corrected optical system comprising six groups consisting of ten elements, the indicies of refraction of which range from 1.654 to 1.807, the image surface being generally shallowly concave to the object.... | 01/22/1985 |
| 4426136 | Projection lens with long working distance A projection lens with a long working distance for projecting a magnified image of an object comprises, in the order from the image side, a diverging first lens group containing a positive lens element and a negative lens element, a diverging second lens ... | 01/17/1984 |
| 4364644 | Gauss type large aperture photographic objective In the device disclosed, eight elements form a Gauss type wide or large aperture objective. The first element counting from the front is a positive meniscus lens of forward convexity, the second is a positive lens of convex curvature toward the front, the... | 12/21/1982 |
| 4266252 | Lens system for document scanning A lens system for scanning a document positioned on a flat support. The lens system operates in cooperation with apparatus which scans a beam of illuminating light across the document and a scanning mirror, which directs reflected light from the illuminat... | 05/05/1981 |
| 4256373 | Fish eye lens system An improved high speed fish eye lens system is provided capable of compensating for lateral chromatic aberration, field curvature and astigmatism while providing an aperture ratio of F/2.8. The fish eye lens system includes a first lens group of a negativ... | 03/17/1981 |
| 4206974 | High resolution objective lens system A high resolution objective lens system for ultra microfiche designed for a magnification of 1/150x~1/120x and comprising a first cemented lens component consisting of a positive lens element and a negative lens element, a second positive lens component, ... | 06/10/1980 |
| 4073575 | Objective for video disks An objective for video disks comprising six lens components of single lenses for which the numerical aperture on the recording surface side is large, working distance is large and aberrations especially spherical aberration and coma are corrected favorabl... | 02/14/1978 |
| 4057328 | Enlarging lens system An enlarging lens system comprising a first lens component which is a positive meniscus lens, a second lens component which comprises a positive meniscus lens and negative meniscus lens, a third and fourth lens components which are respectively positive m... | 11/08/1977 |
| 4013349 | Wide-angle objective A wide-angle objective composed of six components separated by air spaces and located three at the object side and three at the image side of a diaphragm, said six lens components taken in consecutive order from the side of the object comprising: a first ... | 03/22/1977 |
