Did You Know...
...that Charles Goodyear performed some of his experiments on rubber while in debtor's prison? He was there so often he referred to it as his "hotel". Chronically in debt because of poor business sense and ill health, Goodyear depended on the generosity of friends and family. Even after he unlocked the secret to vulcanizing rubber, he was unable to improve his financial situation. When he died, his estate was $200,000 in debt.
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| Number | Title | Issue Date |
| 8089698 | Wide-angle optical lens assembly A wide-angle optical lens assembly comprises, in order from an object side to an image side: a first lens element with a negative refractive power having concave image-side surface, a second lens element with a positive refractive power, a third lens element with a ... | 01/03/2012 |
| 7978417 | Eyepiece optical system and electronic view finder incorporating the same The invention relates to an eyepiece optical system that, albeit being of small size, works in favor of gaining an angle of field and optical performance, and an electronic view finder incorporating such an eyepiece optical system. Specifically, the invention is cha... | 07/12/2011 |
| 7369319 | Optical system for telescope An optical system (1) of telescope includes an objective lens (10) for collecting incident light and transmitting the incident light along a light path, and an imaging lens group (20) disposed on the light path that makes the optical system focu... | 05/06/2008 |
| 7230756 | Integrated optical system for endoscopes and the like Optical systems for endoscopes, borescopes, dental scopes, and the like which are characterized by having three groups of lenses of positive optical power and an external entrance pupil. Typically, all three groups of lenses are displaced from the pupil and focal pl... | 06/12/2007 |
| 7177087 | Compound asperic ocular for riflescope An ocular or eyepiece lens assembly for a riflescope or spotting scope or other types of telescopic optical systems which may include a three element lens assembly comprised of materials of three different refractive indices, at least one of the lens elements compos... | 02/13/2007 |
| 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 |
| 7150537 | Projection television device and screen A front projection display device is provided including an image-generating source configured to generate an image, a wide angle lens system adapted to receive the image, and a screen. The wide angle lens system may be configured to increase distortion of the image ... | 12/19/2006 |
| 7142374 | Optical system for laser riflescope An optical system for a laser riflescope includes, an objective lens group (1), an eyepiece lens element (3) defining an optical axis with the objective lens group, and an erector lens group (2) positioned between the objective lens group and th... | 11/28/2006 |
| 7023622 | Miniature microscope objective lens A miniature microscope objective for a miniature microscope array (MMA) includes preferably at least three or four lenses including from object to image a first positive lens, a second positive lens and a third negative lens. The objective has a numerical aperture (... | 04/04/2006 |
| 6922285 | Optical system for photographing stereoscopic image, and stereoscopic image photographing apparatus having the optical system A stereoscopic image photographing optical system includes a pair of front optical components of negative refractive power, a combining optical element for superposing respective optical axes of the pair of front optical components on each other, a rear optical comp... | 07/26/2005 |
| 6873640 | Laser diode collimating system A laser diode collimating system comprises a collimating lens for receiving a laser beam from a laser diode LD. First and second orthogonally arranged cylindrical lenses are provided through which the laser beam passes. The cylindrical lenses are positioned so as to... | 03/29/2005 |
| 6735019 | Zoom eyepiece optical system A zoom eyepiece optical system, which is used with an objective optical system, includes a first lens group which is stationary with respect to the objective optical system, a negative second lens group which is movable upon zooming, a positive third lens group whic... | 05/11/2004 |
| 6529334 | Eyepiece variable focal length optics Eyepiece variable focal length optics comprise, in order from the objective optics, a negative lens group, a positive lens group, a positive lens group and a positive lens group; during variable focal length from longest focal length side to shortest foca... | 03/04/2003 |
| 6414798 | Eyepiece for picture display device An eyepiece, consisting of two lens groups, is lighter in weight and more compact than known previously, yet has aberrations that are favorably corrected despite the eyepiece having a large exit pupil diameter. This is accomplished by including a predeter... | 07/02/2002 |
| 6330115 | Microscope eyepiece with 10× magnification The invention relates to a microscope eyepiece with theoretically reduced astigmatism in a compensating optical system. The inventive eyepiece has 10× magnification, a sight field (SFZ)ࣘ25 and a Petzval sum (SP) of 0.014ࣘSPࣘ0.021. Said eyepiece com... | 12/11/2001 |
| 6282030 | Eyepiece assembly using plastic aspheric element An eyepiece lens assembly including a collecting lens, glass spherical cemented doublet, a plastic singlet, and a glass spherical singlet. The assembly provides over 30 degrees extended field of view, a greater than 30 mm eye relief, under 5% distortion, ... | 08/28/2001 |
| 6166861 | Wide-angle eyepiece lens A wide-angle eyepiece lens having an angle of view greater than 60° comprises, in order from the object end, a first lens group including a positive power meniscus lens element with a concave object side surface, an overall negative power second lens gro... | 12/26/2000 |
| 6130785 | Eyepiece lens system There is provided an eyepiece lens system for viewing an image formed by an objective lens system. The eyepiece lens system includes a first refraction lens having a positive power, a second refraction lens having a positive power and at least one diffrac... | 10/10/2000 |
| 6115182 | Real-time optical finder system A real-image finder optical system includes a positive objective optical system, an image-erecting optical system and an eyepiece optical system, in this order from the object. The image-erecting optical system includes a pattern display surface having a ... | 09/05/2000 |
| 6104542 | Wide-angle eyepiece lens with large eye relief Wide-angle eyepiece lenses for a microscope are disclosed. A representative lens comprises, from the object side to the eye side, a first lens group with positive refractive power, a second lens group with a concave surface facing the object side and a su... | 08/15/2000 |
| 6104543 | Eyepiece optical system An eyepiece optical system includes the first lens group constituted by a negative single meniscus lens element having a convex surface on the side of a user's eye, and the second lens group having positive power as a whole, in this order from the object,... | 08/15/2000 |
| 6094310 | Eyepiece system having wide visual field An eyepiece system comprising, in order from the object side, a first lens unit having a negative refractive power and a second lens unit having a positive refractive power, and configured to locate an intermediate image formed by an objective lens system... | 07/25/2000 |
| 6069750 | Wide-field eyepiece A wide-field eyepiece, formed of at least four lens groups and five lens elements, is disclosed which satisfies predetermined conditional expressions, so as to provide an eyepiece having an angle of view of at least 65 degrees with less than 6% distortion... | 05/30/2000 |
| 6011655 | Eyepiece An eyepiece including a positive first lens element, a negative second lens element, a positive third lens element and a positive fourth lens element is provided. The first, second, third, and fourth lens elements are spaced from one another and arranged ... | 01/04/2000 |
| 6008949 | Eyepiece lens An eyepiece lens is disclosed, in which the total number of constituent lenses is reduced but good optical performance is obtained by setting forth proper rules of design for optical parameters.... | 12/28/1999 |
| 5986816 | Eyepiece optical system and eyepiece image display device An eyepiece optical system for projecting a plane image on a two-dimensional display element onto an eyeball as an extended virtual image, comprises a first group of lenses G1 including a positive meniscus lens L1 having a concave face toward the eyeball,... | 11/16/1999 |
| 5978145 | Viewfinder optical system A viewfinder optical system has a relay lens system and an eyepiece optical system. The relay lens system refocuses a primary image as a secondary image. The relay lens system consists of a single lens element which has a surface having optical power of d... | 11/02/1999 |
| 5973847 | Eyepiece lens An eyepiece lens is disclosed, in which the total number of constituent lenses is reduced but good optical performance is obtained by setting forth proper rules of design for optical parameters.... | 10/26/1999 |
| 5926321 | Ocular optical system and ocular image display apparatus An ocular optical system to be placed in front of a human eye forms a magnified virtual image of an original image displayed on a two-dimensional display element. The system has, in order from the eye: a positive first lens group including, in order from ... | 07/20/1999 |
| 5877900 | Eyepiece with wide field of view An eyepiece includes a biconvex lens, a bonded negative meniscus lens including a negative lens with a concave surface which faces the object, and a positive lens having a convex surface which faces an eyepoint. A biconvex lens and a positive lens having ... | 03/02/1999 |
| 5852511 | Optical system for non-flexible endoscopes In a non-flexible endoscope consisting of an insertion section and an eyepiece section which are separable from each other, an optical system configured so as to correct chromatic aberration produced by an observation optical system disposed in the insert... | 12/22/1998 |
| 5850311 | Eyepiece system An eyepiece system which is configured for observing an image formed by an objective lens system and comprises, in order from a side, of the objective lens system, a first lens element having at least one aspherical surface and a concave surface on the si... | 12/15/1998 |
| 5847880 | 60 degree field of view eyepiece An optical eyepiece assembly for providing a sixty degree field of view cbility to an image intensifier. The assembly includes first and second air-spaced lens doublets, a first lens, filter element, and second lens.... | 12/08/1998 |
| 5774270 | Wide-field eyepiece lens An eyepiece lens suitable for use in microscopes, binoculars, and the like is disclosed. The eyepiece lens provides a large eye relief of more than 80 percent of the focal length of the eyepiece lens in an apparent field of view of more than 60 degrees, p... | 06/30/1998 |
| 5751495 | Eyepiece lens An eyepiece lens has an apparent field of no less than 40°, and minimizes eye relief error. The eye relief includes a distance between a lens surface closest to an eye point side in the eyepiece lens and an eye point. The eyepiece lens comprises an assem... | 05/12/1998 |
| 5748380 | Eyepiece lens with long eye relief An eyepiece lens is disclosed that corrects aberrations over a wide apparent field of view, and has a short overall length and sufficiently long eye relief (typically at least 150% of overall focal length F). The eyepiece lens comprises, in order from the... | 05/05/1998 |
| 5703724 | Objective lens system for endoscope An objective lens system for an endoscope comprises from the subject end to the image end a meniscus lens element of negative optical power having a concave image side surface, a plano-convex lens element of positive optical power having a convex subject ... | 12/30/1997 |
| 5701475 | Eyepiece lens An eyepiece lens comprising, from front to rear, a first lens unit of positive refractive power having a negative lens and a positive lens, a second lens unit of positive refractive power and a third lens unit of positive refractive power, wherein at leas... | 12/23/1997 |
| 5691850 | Eyepiece An eyepiece has an apparent visual angle of 40° or more, and is constituted by, in the following order from the eyepoint side, a first lens group including a cemented lens of negative and positive lens components and having a positive refractive power, a... | 11/25/1997 |
| 5680249 | Optical system for camera An optical system for a compound camera includes an equivalent image plane provided at a position substantially optically equivalent to an image plane of the photographing lens system. A condenser lens is provided proximate to the equivalent image plane a... | 10/21/1997 |
