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| Number | Title | Issue Date |
| 5991090 | Afocal zoom system The invention is directed to an afocal zoom system for a surgical microscope. The zoom system has an even number of members and is symmetrically configured.... | 11/23/1999 |
| 5978149 | Zoom lens system A zoom lens system includes two lens components, and zooming is performed by moving a first lens component. The zooming is performed along a zoom curve such that the first lens component is moved out so that in-focus condition is obtained at a subject dis... | 11/02/1999 |
| 5872658 | Zoom lens system A zoom lens system includes, from the object to image side, a first lens unit of a positive refractive power having a first lens element with a power to both diffract and refract light. A second lens unit has a negative refractive power and may include a ... | 02/16/1999 |
| 5841588 | Zoom lens system with vibration reduction means A zoom lens system with vibration-reduction function, comprising, in order from an object side: a first lens group having a positive refractive power; a second lens group having a negative refractive power; a third lens group having a negative refractive power; a f... | 11/24/1998 |
| 5805348 | Lens system with reduced sensitivities and a method of manufacturing A lens system has nominal focal length and aberrations and includes a plurality of lens components defined by design parameter values and a special airspace distance. The lens system is characterized in design such that manufacturing deviations from the d... | 09/08/1998 |
| 5760957 | Zoom lens having the vibration-reduction function A zoom lens having the vibration-reduction function includes, in succession from the object side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a third lens unit having negative refractive power, ... | 06/02/1998 |
| 5751496 | Zoom lens of rear focus type A zoom lens of the rear focus type is disclosed, comprising, 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, a third lens unit of positive refractive power, a ... | 05/12/1998 |
| 5717525 | Zoom lenses In order to reduce complexity and cost of fabrication of zoom lenses, the real image forming lens group module at the front of the zoom lens is replaced with a two-element group where one of the elements has a diffractive lens on a curved surface thereof ... | 02/10/1998 |
| 5619381 | Offset zoom lens for reflective light modulators A projection optical system. The system (10) contains two movable lens groups, a zoom lens group (20) and a compensator group (18). The compensator group (18) includes a movable aperture stop (21), thereby eliminating the need for a variable aperture stop... | 04/08/1997 |
| 5572365 | Zoom lens system A zoom lens system has at least three lens groups in which two lens groups are moved together during the zooming operation. One of the two lens groups moved has a small degree of contribution to the variation of magnification and is referred to as lens gr... | 11/05/1996 |
| 5548445 | Zoom lens system A zoom lens system consists of a positive first lens group G1, a negative second lens group G2, a stop, a positive third lens group G3, a positive fourth lens group G4 and a positive fifth lens group G5 arranged in this order from the object side. The sec... | 08/20/1996 |
| 5502594 | Zoom lens incorporating vibration-proofing function A zoom lens incorporating a vibration-proofing function comprises, sequentially from an object side, a first lens group G1 having a positive refracting power; a second lens group G2 having a negative refracting power; a third lens gr... | 03/26/1996 |
| 5329402 | Wide-angle zoom lens A small-sized and bright wide-angle zoom lens having a variable power ratio on the order of 2 at a field angle of approximately 84° and constructed of a small number of constructional lens. The wide-angle zoom lens, sequentially from an object, comprises... | 07/12/1994 |
| 5321553 | Zoom lens In a zoom lens having a lens unit of negative refractive power most adjacent to the object side, distortion can be corrected better and an excellent imaging performance is maintained. In a zoom lens having a lens unit of negative refractive power most adj... | 06/14/1994 |
| 5268790 | Zoom lens employing refractive and diffractive optical elements A zoom lens (10) has a first lens group (12), a second lens group (14) and a third lens group (16). The first lens group relays an outside scene to an intermediate plane. The second lens group varies magnification of the relayed image from the first lens ... | 12/07/1993 |
| 4978205 | Vibration-isolating optical system A vibration-isolating optical system having an image stabilizing function, comprising: a fixed lens optical system having a plurality of lens groups which are arranged to be stationary in the vertical direction with respect to the optical axis; and a vibr... | 12/18/1990 |
| 4971428 | Catadioptric zoom lens A catadioptric zoom lens comprising from the object end a first catadioptric group including a relay subgroup for forming an intermediate image, zoom relay, the zoom relay including a positive variator group and a negative power compensator group, the var... | 11/20/1990 |
| 4630899 | Zoom lens having movable diaphragm In the disclosed zoom lens, a varifocal lens system includes a positive first component at the object end of the system and is movable closer to the object in a telephoto position than in a wide angle position. A diaphragm on the image end of the varifoca... | 12/23/1986 |
| 4624536 | Four component zoom lens A zoom lens in which two pairs of optical elements of the lens are each movable simultaneously relative to each other to attain desired magnification while maintaining the image surface of the lens system substantially fixed. A common body supporting both... | 11/25/1986 |
| 4564267 | Variable-focal-length lens Disclosed is a variable-focal-length lens whose focal length can be electrically controlled by applying an electric field of uniform intensity distribution to a compound lens including at least one lens formed of electrooptic crystal and varying the inten... | 01/14/1986 |
| 4377325 | Bright and compact optical-compensation type zoom lens system A bright and compact optical-compensation type zoom lens system comprising a first lens group I having positive refractive power, a second lens group II having negative refractive power, a third lens group III having positive refractive power, and a fourt... | 03/22/1983 |
| 4348082 | Zoom lens having high zoom ratio including wide angle range A compact zoom lens having a high zoom ratio including a wide angle range is composed of a first positive lens group, a second negative lens group and a positive third lens group arranged in that order from the object side of the lens. The first and third... | 09/07/1982 |
| 4240700 | Wide angle zoom lens having a high variation ratio The present invention relates to a wide angle zoom lens system having a high variation ratio and a zooming range between a wide angle and a semi-telescopic angle, with the zoom ratio being approximately 2.3 to 3.0 times. The present invention provides the... | 12/23/1980 |
| 4232942 | Optically compensated zoom lens An optically compensated zoom lens particularly suited for use in a still camera. This lens system comprises positive first, negative second and positive third lens groups counting from the front of which the first and third ones are axially movable in fi... | 11/11/1980 |
| 4126377 | Zoom optical system for microscopes An optical compensation type zoom optical system for microscopes comprising a first through fourth lens groups, and is so adapted as to displace said first and third lens groups for zooming while said second and fourth lens groups are kept fixed, said opt... | 11/21/1978 |
| 4094587 | Afocal front attachment for zoom objective A substantially afocal front attachment of variable magnification ratio, to be combined with a fixed-focus rear lens group in order to form a zoom objective, consists of two fixedly interconnected outer lens members and an axially shiftable biconvex inter... | 06/13/1978 |
