Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 7982978 | Imaging lens An imaging lens includes a first lens group that includes sequentially from an object side, a first lens formed of resin and having a positive refractive power and a second lens formed of resin and having a negative refractive power, the first lens and the second le... | 07/19/2011 |
| 7808724 | Spectroscopy lens for telecentric sensor A lens system with a first group having a positive meniscus lens and a sensor. The optical distance between the front surface of the first group and the sensor can be not greater than the height of the sensor times the image F-number, which may alternatively be refe... | 10/05/2010 |
| 7715122 | Wide-angle zoom optic system A wide-angle zoom optic system includes: in an order from an object, a first lens group having a negative refractive power; a second lens group having a positive refractive power; and a third lens group having a positive refractive power, wherein the first lens grou... | 05/11/2010 |
| 7411745 | Large-aperture-ratio internal focusing telephoto lens The purpose is to provide a large-aperture-ratio internal focusing telephoto lens applicable to a wider photographing area by equipping a vibration reduction function capable to satisfactorily correct a camera shake and the like with securing superb optical performa... | 08/12/2008 |
| 7196855 | Image-capturing lens, image-capturing device and image capturing unit An image capturing lens to capture an image of an object is provided with an aperture diaphragm having an aperture through which an image is captured; a first lens having a positive refracting power, wherein both surfaces of the first lens are shaped in a convex for... | 03/27/2007 |
| 7173774 | Objective lens The compact imaging assembly has an electronic imager and an objective lens with a focal length fo. The objective lens receives light and forms an image of the object on the imager's image plane. The image plane has a maximum effective dimension DI. The objective le... | 02/06/2007 |
| 7154683 | Five-element optical device An optical device with five air-spaced optical elements. An optical device in the form of an eyepiece is disclosed with a center negative lens and two outer positive lenses on each side of the intermediate negative lens. The eyepiece transmits light from an object t... | 12/26/2006 |
| 7035023 | Lens system This application discloses a lens system comprising in order from an object side to an image side: an aperture stop; a first lens element, having a positive optical power; and a second lens element, having a negative optical power. By setting the shapes of the respe... | 04/25/2006 |
| 6977779 | Imaging lens An imaging lens for an image pickup device is formed of only three lens components of positive, negative, and positive refractive power, in order from the object side. A diaphragm stop is positioned on the object side of the lens component nearest the object side. S... | 12/20/2005 |
| 6912095 | Projection lens system A compact and light-weighted projection lens system that is capable of projecting an image at an angle as wide as 75 degrees with sufficient field angle and brightness as represented by F number of approximately 2.4, that is capable of effectively correcting chroic ... | 06/28/2005 |
| 6809878 | Zoom lens The present invention provides a compact, thin zoom lens. The zoom lens according to the present invention includes, from an object side to an image plane side, a first lens group having an overall negative overall refractive power, a second lens group having an ove... | 10/26/2004 |
| 6728033 | Image stabilizing optical lens device with decentering of lens sub-unit An image stabilizing optical lens device including, in order from an object side to an image side of the image stabilizing optical lens device, a first lens unit having positive refractive power, a second lens unit having negative refractive power and being movable ... | 04/27/2004 |
| 6728047 | Compact photographing lens This invention is related to a compact photographing lens wherein an aperture stop is arranged at a position closest to an object, a first lens group, a second lens group, and a third lens group are arranged sequentially from the object side, the first lens group is... | 04/27/2004 |
| 6490096 | Achromatic lens and zoom lens using the same In a zoom lens comprising first to fourth lens groups, the second lens group comprises two meniscus lenses and an achromatic lens. The achromatic lens comprises a cemented lens having a negative refracting power as a whole, and a lens having a positive re... | 12/03/2002 |
| 6384975 | Image stabilizing optical lens device with decentering of lens sub-unit An image stabilizing optical lens device including, in order from an object side to an image side of the image stabilizing optical lens device, a first lens unit having positive refractive power, a second lens unit having negative refractive power and bei... | 05/07/2002 |
| 6252723 | Objective optical system An objective optical system comprising, in order from the object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power and a third lens unit having a positive refractive power, wherein the second... | 06/26/2001 |
| 5835286 | Standard lens system having a large aperture ratio A standard lens system composed, in order from the object side, of a first lens unit having a positive refractive power, an aperture stop, a second lens unit having a positive refractive power and a third lens unit having a negative refractive power: the ... | 11/10/1998 |
| 5568325 | Achromatic lens system An achromatic lens system includes in order, from the object side, a front lens group, a chromatic aberration correcting lens group, and a rear lens group. Aberrations, including spherical aberration, coma, astigmatism, curvature of image, as well as axia... | 10/22/1996 |
| 5526191 | Fourier transform lens assembly A Fourier transform lens assembly suited for use in an optical information processor includes a first lens group having a positive power, a second lens group having a negative power disposed on one side of the first lens group, and a third lens group havi... | 06/11/1996 |
| 5483382 | Projection lens and method of using same A new and improved projector lens arrangement which can automatically adjusted for focusing purposes in an easily and convenient manner according to a novel focusing method of the present invention. The projection lens arrangement generally includes three... | 01/09/1996 |
| 5371626 | Wide angle binocular system with variable power capability Binoculars designed to provide a large aided static field of view are provided. The binoculars are characterized by S/D ratios of above 2.8, where S is the binoculars' aided static field of view calculated by multiplying the binoculars' magnifying power b... | 12/06/1994 |
| 5321555 | Compact photographic objective of the triplet type having improved chromatic and monochromatic characteristics An objective for use in photographic compact cameras has a relative aperture of 3.5 and a focal length of 35 mm, and is of the triplet type. The lens element on the object side is a cemented element. In order to achieve an extremely compact structural sha... | 06/14/1994 |
| 5257134 | Zoom lens A zoom lens for the projector includes, in order from a screen, a first lens unit of positive refractive power, a second lens unit of negative refractive power and a third lens unit of positive refractive power, zooming from the wide-angle end to the tele... | 10/26/1993 |
| 5247393 | Zoom lens A zoom lens comprises a first lens unit having a positive refractive power, a second lens group having a negative refractive power, an iris and a third lens unit having a positive refractive power, arranged in this sequence as viewed from an object. The t... | 09/21/1993 |
| 5204782 | Color-corrected optical 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... | 04/20/1993 |
| 5202795 | Eyepieces The invention relates to an eyepiece that has an improved image surface flatness even at a wider field angle, is well corrected for various aberrations inclusive chromatic aberration of pupil and is usable with inexpensive microscopes (esp., stereoscopic ... | 04/13/1993 |
| 4948236 | Soft-focus lens system A soft-focus lens system can be composed of, in order from the object side, a front group having a one-group-two-element or two-group-two-element composition of a positive and negative lens element with a positive overall power and a rear group having a o... | 08/14/1990 |
| 4898457 | Optical system of television camera An optical system of a television camera comprises, according to the invention, arranged in the direction of the light flux on one optical axis, an objective composed of n elements and a faceplate of a television tube, a light-sensitive layer being locate... | 02/06/1990 |
| 4852984 | Telephoto lens of large aperture ratio A telephoto lens comprising, from front to rear, a first lens unit including a lens of negative power with its rear surface concave toward the rear and whose overall power is positive, a second lens unit of negative power axially movable for focusing, and... | 08/01/1989 |
| 4836665 | Objective lens An objective lens having a stop provided most adjacent to the image side comprises, in succession from the object side, a first lens which is a positive meniscus lens having its convex surface facing the object side, a second lens which is a biconcave len... | 06/06/1989 |
| 4487484 | Behind-stop Tesser type lens system A behind-stop Tesser type lens system comprising a first lens component of a positive meniscus lens of which a convex surface is faced to the object-side, a second lens component of biconcave lens, and a third lens component of a cemented doublet comprisi... | 12/11/1984 |
| 4478497 | Attachment lens system An attachment lens system arranged to be used by attaching on the image side of a master lens system and comprising a front lens group and a rear lens group wherein the front lens group comprises first and second lens components and the rear lens group co... | 10/23/1984 |
| 4273424 | Variable aberration lens system A variable aberration lens system usable not only as a general photographic lens but also a soft focus lens is provided. The variable aberration lens system includes at least a variable meniscus-shaped air space and cementing surface which are respectivel... | 06/16/1981 |
