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| Number | Title | Issue Date |
| 5155629 | Zoom lens system A zoom lens system comprising, in order from the object side, a first lens group that includes at least three lens elements and that has a negative overall power and a second lens group that includes at least four lens elements, with the negative lens ele... | 10/13/1992 |
| 5144480 | Keplerian zoom finder optical system A Keplerian zoom finder optical system includes an objective lens unit comprising a forward group having negative refractive power and a rearward groups having positive refractive power, the objective lens unit having positive refractive power as a whole ... | 09/01/1992 |
| 5132838 | Keplerian zoom finder optical system In a Keplerian zoom finder optical system including an objective lens unit having a magnification changing function and having positive refractive power, and an eyepiece unit having positive refractive power for enlarging and observing therethrough a real... | 07/21/1992 |
| 5087989 | Objective optical system for endoscopes An objective optical system for endoscopes consisting, in the order from the object side, of a front lens unit having negative refractive power, an aperture stop and a rear lens unit having positive refractive power and comprising at least one aspherical ... | 02/11/1992 |
| 5076677 | Zoom lens A two-group zoom lens includes a first lens group having a negative refractive power, and a second lens group having a positive refractive power, zooming being effected with the spacing between the first lens group and the second lens group being relative... | 12/31/1991 |
| 5054897 | Plastic zoom lens A plastic zoom lens has a first group of lenses having negative refracting power and arranged on an object side of the zoom lens; a second group of lenses having positive refracting power and arranged on an image side of the zoom lens; and a device for ch... | 10/08/1991 |
| 5005955 | Keplerian zoom finder optical system A Keplerian zoom finder optical system having a zoom power variable objective lens, the Keplerian zoom finder optical system comprising: a zoom objective lens including a first lens group having a negative refracting power and a second lens group includin... | 04/09/1991 |
| 5000549 | Zoom lens for stabilizing the image A zoom lens is disclosed, comprising a front lens group including a compensation lens sub-group arranged to move in a direction having a directional component transverse to the optical axis in order to stabilize the image, and a rear lens group positioned... | 03/19/1991 |
| 4993814 | Zoom lens system A zoom lens system comprises from object side to image side, a front lens unit of a negative refractive power and a rear lens unit of a positive refractive power with a variable air space, which changes in the zooming operation, formed between the front a... | 02/19/1991 |
| 4976522 | Objective lens system for endoscopes An objective lens system comprising, in the order from the object side, a first lens group having negative refractive power and a second lens group having positive refractive power, and so adapted as to perform variation of focal length and focusing by sh... | 12/11/1990 |
| 4925280 | Vari-focal lens system A compact, light-weight vari-focal lens system manufacturable at low cost comprising a negative front lens group and a positive rear lens group, said front lens group consisting of a first positive lens unit and a second lens unit having a vari-focal func... | 05/15/1990 |
| 4861147 | Zoom lens system In a focusing method for the rear focus type of zoom lens where the range in which the focusing lens should be present for focusing to different object distances varies with zooming, the focusing lens is prevented from moving to the outside of the aforesa... | 08/29/1989 |
| 4838668 | Zoom lens A zoom taking lens for a photographic single lens reflex (SLR) camera. The lens has an air space between elements of the lens, which air space is large enough to accommodate reflective means for directing rays which have passed through elements of the len... | 06/13/1989 |
| 4828372 | Wide-angle zoom lens A compact wide-angle zoom lens with short back focus comprises a forwardmost negative power lens unit movable for focusing and compensation during zooming, followed by a positive power variator lens unit comprising a forward positive power lens sub-unit m... | 05/09/1989 |
| 4822153 | One-hand zoom lens barrel A lens barrel for a zoom lens in which zooming is achieved by moving both front and rear lenses but focussing is achieved by moving only the front lens. When a sliding ring slides linearly for zooming, a cam sleeve is rotated. A pin in the cam sleeve enga... | 04/18/1989 |
| 4818082 | Compact wide-angle close-focus SLR zoom lens A wide-angle close-focus zoom lens for a single lens reflex camera, said lens having no more than a total of three independent movable lens element units or sub-units. The lens can have as few as eight lens elements without requiring any aspheric lens ele... | 04/04/1989 |
| 4775228 | Zoom lens A zoom lens whose first lens group, counting from front, has a negative refractive power and moves axially in differential relation to a following lens group to effect zooming, wherein the first lens group is constructed with a lens unit of negative power... | 10/04/1988 |
| 4750820 | Zoom lens having magnification factors in the range of 20X to 47X for micrographic applications A zoom lens system having magnification factors in the range of 20 to 47. The lens system of the present invention is particularly useful in micrographic reader/printers.... | 06/14/1988 |
| 4746204 | Zoom lens having magnification factors in the range of 14X to 32X for micrographic applications A zoom lens system having magnification factors in the range of 14 to 32. The lens system of the invention is particularly useful in micrographic reader/printers.... | 05/24/1988 |
| 4743102 | Zoom lens having magnification factors in the range of 12X to 24X for micrographic applications A zoom lens system which provides magnification factors in the range of 12 to 24. The lens system of the invention is particularly useful in micrographic reader/printers.... | 05/10/1988 |
| 4733951 | Zoom lens having magnification factors in the range of 6.5x to 14x for micrographic applications A zoom lens system having magnification factors in the range of 6.5 to 14. The lens system of the invention is particularly useful in micrographic reader/printers.... | 03/29/1988 |
| 4662723 | Flare stop for a large aperture ratio zoom lens system A flare stop for a large aperture ratio zoom lens system comprising a diverging lens group and a converging lens group and arranged to be zoomed by moving the diverging lens group and converging lens group along the optical axis so that the airspace betwe... | 05/05/1987 |
| 4445756 | Reflex zoom lens barrel A reflex zoom lens barrel comprising a front frame which carries reflex optical lens means having a positive focal length, a rear frame which carries transmission optical lens means having a negative focal length, zooming means for moving the front and re... | 05/01/1984 |
| 4185893 | Zoom lenses Compact, high performance low zoom ratio variable viewing angle lens systems are provided by constructing the lens systems of two lens groups separated by a variable aerial space and limiting the dimensions of the lens systems by various mathematical cond... | 01/29/1980 |
| 4159864 | Aperture stop control device for a zoom lens system An aperture stop control device for a zoom lens system includes a variable aperture stop, a first sensor for determining the diameter of the aperture stop and providing a first electrical signal representative of the diameter of the aperture stop means an... | 07/03/1979 |
| 4009942 | Zoom lens device A zoom lens device comprises a zooming section including a group of focusing lenses, a group of variator lenses and a group of compensator lenses, and a relay section for focusing the light beam from the zooming section. The zoom lens device permits its z... | 03/01/1977 |
| 3944324 | Image stabilized zoom lens system A zoom lens system comprising an afocal front lens assembly and an image forming rear lens assembly is provided with stabilized optical means arranged in the optical path between said front and rear lens assemblies. When zooming, the stabilized optical me... | 03/16/1976 |
