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| Number | Title | Issue Date |
| 7382548 | Variable magnification optical system A variable magnification optical system of the present invention for forming an optical image of an object on a light-receiving surface of an image sensor with variable magnification includes: from the object side, at least a first lens unit having a positive optica... | 06/03/2008 |
| 7365910 | Electronic image pickup system The invention relates to an electronic image pickup system whose depth dimension is extremely reduced, taking advantage of an optical system type that can overcome conditions imposed on the movement of a zooming movable lens group while high specifications and perfo... | 04/29/2008 |
| 6856468 | Zoom lens A zoom lens comprises in a direction of light propagation a front lens group (G1) having positive refractive power, a variator lens group (G2) having negative refractive power, a compensator lens group (G3) having positive refractive power, and ... | 02/15/2005 |
| 6178046 | Anti-aliasing diffractive aperture and method of using same An anti-aliasing aperture and method of using the same is disclosed. In one embodiment, an anti-aliasing method includes passing light through an aperture stop, and diffracting the light passing through the aperture stop for spreading an image of a point ... | 01/23/2001 |
| 6002526 | Zoom lens system A zoom lens system that is free from parallax, is compact, and offers excellent optical performance has, from the object side, a positive first lens unit, a negative second lens unit, a positive third lens unit, and a negative fourth lens unit. The zoom l... | 12/14/1999 |
| 5317451 | Albada finder An albada finder comprising an objective lens group, which includes two negative lenses, and an eyepiece lens group, which includes two positive lenses, arranged in this order from the object side. A view frame is formed on the object side surface of the ... | 05/31/1994 |
| 4744641 | Telephoto lens assembly for overhead projector The invention consists of a four-element telephoto projection lens for use in conventional overhead projectors, which lens assembly affords an extended projection distance from the lens to the projection screen while retaining the same back focus as conve... | 05/17/1988 |
| 4492440 | Finder optical system A finder optical system wherein a field mask is arranged in a position near to an eyepiece from a field lens so that a distortionless image of the field mask may be observed. The field mask can be provided directly on the peripheral side of the field lens... | 01/08/1985 |
| 4037938 | Retrofocus-type objective for endoscopes A compact retrofocus-type wide-angle objective for endoscopes comprising a front diverging lens group comprising a lens having negative power and a rear converging lens group comprising a positive lens on which absolute value of radius of curvature on the... | 07/26/1977 |
