Did You Know...
...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.
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| Number | Title | Issue Date |
| 8023202 | Imaging lens The present invention is an imaging lens of which optical performance does not deteriorate even in a high temperature environment, various aberrations are well corrected, optical length is short, and back focus is sufficiently secured, the imaging lens comprising a ... | 09/20/2011 |
| 7957074 | Imaging lens system and imaging apparatus using the imaging lens system An imaging lens system is provided an includes: in order from the object side, a first lens which has a negative power; a second lens which has a negative power; a third lens; a fourth lens which has a positive power; a fifth lens; and a sixth lens which has a posit... | 06/07/2011 |
| 7411740 | Zoom lens Disclosed is a zoom lens, which includes, in sequence from an object side to an image side, a positive first lens group, a negative second lens group, a positive third lens group, a positive fourth lens group, a fifth lens group, a negative sixth lens group and a po... | 08/12/2008 |
| 7403339 | Zoom lens and image projection apparatus having the same A zoom lens comprises a plurality of lens units including a first lens unit disposed most adjacent to an enlargement side and having negative refractive power, wherein one or more lens units of the plurality of lens units are moved in the direction of the optical ax... | 07/22/2008 |
| 7362509 | Zoom lens A zoom lens includes, in sequence from the object side: a first lens group with an overall negative refractive power; and a second lens group with an overall positive refractive power. A zoom factor changes by moving the second lens group. Focal adjustments are made... | 04/22/2008 |
| 7317580 | Zoom lens In this invention, to provide a compact zoom lens having a small number of optical element groups to be driven and a simple moving mechanism, at least one of a plurality of optical element groups arranged in the lens system includes a refractive power variable eleme... | 01/08/2008 |
| 7289273 | Zoom lens and electronic imaging apparatus having the same A zoom lens includes, in order from the object side, the first lens unit consisting of one negative lens component in which a plurality of lens components are cemented to one another and the second lens unit including one negative lens component and having positive ... | 10/30/2007 |
| 7262925 | Image lens array An image lens array, from object side, comprises: a first positive meniscus plastic lens with a convex surface facing forward, a second negative meniscus plastic lens with a concave surface facing forward, a third positive meniscus plastic lens with a convex surface... | 08/28/2007 |
| 7227698 | Optical unit, and image taking apparatus provided therewith A plurality of lens units in an optical unit has at least: from the object side toward the image side, a first lens unit having a positive optical power, a second lens unit having a negative optical power, a third lens unit having a positive optical power, and a fou... | 06/05/2007 |
| 7215477 | Zoom lens and image display apparatus including the zoom lens Provided is a projection lens, including: a plurality of moving lens units that move on an optical axis for zooming; and a plurality of plastic lenses containing plastic, in which when a focal distance of an i-th positive lens from a predetermined plane side of N po... | 05/08/2007 |
| 7190528 | Zoom lens and image projection apparatus having the same A zoom lens comprises a plurality of lens units including a first lens unit disposed most adjacent to an enlargement side and having negative refractive power, wherein one or more lens units of the plurality of lens units are moved in the direction of the optical ax... | 03/13/2007 |
| 7187504 | Zoom lens and image pick up apparatus including the same A zoom lens includes, in order from an object side to an image side: a first lens unit having positive optical power; a second lens unit having negative optical power; a third lens unit having positive optical power and an aperture stop; a fourth lens unit having ne... | 03/06/2007 |
| 7079324 | Zoom lens and image projection apparatus including the same A zoom lens includes a plurality of lens groups including a first lens group arranged on the foremost side and having negative optical power. Zooming is performed by moving at least one of the plurality of lens groups along a direction parallel to an optical axis of... | 07/18/2006 |
| 7068441 | Zoom lens optical system A zoom lens optical system includes a first optical group with a first lens having negative refraction, a second lens having positive refraction, and a light path changing unit to change the path of an incident light passing through the first lens to have light inci... | 06/27/2006 |
| 6989937 | High-aperture projection lens A six-element cinema projection lens is described in front of which an aspherized plane-parallel plate is positioned on the screen side. This arrangement permits the cost-effective design of a cinema projection lens with a relative aperture of 1:1.7 having very good... | 01/24/2006 |
| 6950246 | Imaging optical system and apparatus using the same The image forming optical system comprises, in order from an object side, a first lens which is positive meniscus lens having a convex surface directed toward an object side, an aperture stop, a second lens which is positive meniscus lens having a convex surface dir... | 09/27/2005 |
| 6801364 | Projection objective for microlithography The invention relates to a projection lens comprising a lens assembly that has at least one first narrowing of the group of light beams. A lens with a non-spherical surface is located in front of and/or behind the first narrowing. ... | 10/05/2004 |
| 6639737 | Zoom lens system and projection apparatus using the same A zoom lens system which allows a reduction in size. This zoom lens makes two points at different distances have an optically conjugate relationship, and sequentially includes, from a first conjugate point side at a longer distance to a second conjugate p... | 10/28/2003 |
| 6636364 | Single-focus lens Provided is a single-focus lens with a shorter overall length which exhibits optimal optical performance chiefly for an imaging lens, and does not require a complicated fabrication technique. In the single-focus lens, consecutively arranged form an object... | 10/21/2003 |
| 6542308 | Projection display apparatus and projection lens device for use therein A projection display apparatus having a light source for generating a white light, a liquid crystal panel for modulating an incident light from the light source, a polarizing plate which is located at a light exiting side of the liquid crystal panel for p... | 04/01/2003 |
| 6498688 | Zoom lens system The present invention provides a compact zoom lens system suitable for a video camera and a digital still camera using a solid-state imaging device, having a zoom ratio of 3.5 or more, an angle of view in a wide-angle end state of about 60°, and superb o... | 12/24/2002 |
| 6449433 | Taking lens device A taking lens device has a zoom lens system having an optical system that is comprised of a plurality of lens units and that achieves zooming by varying the unit-to-unit distances and an image sensor that converts an optical image formed by the zoom lens ... | 09/10/2002 |
| 6445512 | Projection television lens systems having improved modulation transfer functions Six-component projection lens systems (13) for use in CRT projection televisions (10) are provided. To provide an improved overall modulation transfer function across the field of view of the lens, the system's first lens element (L1) has an object side s... | 09/03/2002 |
| 6396641 | Projection lens system and projection image display apparatus using the same When a projection lens system used for a rear projection type image display apparatus has a first lens group having an aspherical lens surface, a second lens group, a third lens group sharing almost all the positive refractive power of the overall system,... | 05/28/2002 |
| 6243211 | Projection lens system and projection image display apparatus using the same When a projection lens system used for a rear projection type image display apparatus has a first lens group having an aspherical lens surface, a second lens group, a third lens group sharing almost all the positive refractive power of the overall system,... | 06/05/2001 |
| 6236515 | Zoom lens system A zoom lens system has the first and second lens units. During zooming from a wide-angle end to a telephoto end, the lens units are moved to decrease a distance therebetween. The first lens unit has a positive refractive power. The second lens unit has a ... | 05/22/2001 |
| 6181479 | Eyepiece lens for a display image observation device An eyepiece lens for a display image observation device is disclosed that has only six lens elements with refractive power, in the order from the eye side, as follows: a first lens group G1 formed of two lens elements L1 and L2 | 01/30/2001 |
| 6046860 | Projection lens system and projection image display apparatus using the same When a projection lens system used for a rear projection type image display apparatus has a first lens group having an aspherical lens surface, a second lens group, a third lens group sharing almost all the positive refractive power of the overall system,... | 04/04/2000 |
| 6033079 | High numerical aperture ring field projection system for extreme ultraviolet lithography An all-refelctive optical system for a projection photolithography camera has a source of EUV radiation, a wafer and a mask to be imaged on the wafer. The optical system includes a first concave mirror, a second mirror, a third convex mirror, a fourth con... | 03/07/2000 |
| 6031669 | Zoom lens A high-performance zoom lens is disclosed having at least four axially movable lens groups for zooming from a wide-angle end to a telephoto end. The zoom lens constitutes a number of lens elements that is no more than twice the number of movable lens grou... | 02/29/2000 |
| 6025959 | Color corrected projection lenses for use with curved faceplate cathode ray tubes A projection television system (10) is provided which has a CRT (16) with a curved faceplate and a projection lens system (13) for forming an image on a screen (14). The projection lens system (13) is characterized by a power lens unit (U2) which (a) prov... | 02/15/2000 |
| 6023375 | Projection lenses for use with large pixelized panels A projection lens for use with LCD panels is provided. The lens has a first lens unit which has a positive power and a second lens unit which has a negative power. The first lens unit contains at least four lens elements, namely, a positive first lens ele... | 02/08/2000 |
| 6008884 | Projection lens system and apparatus A high-performance dioptric reduction projection lens and projection exposure apparatus and projection exposure method using same. The projection lens includes six lens groups and has a positive negative positive negative positive refractive power arrange... | 12/28/1999 |
| 5946142 | Projection lens system and projection image display apparatus using the same When a projection lens system used for a rear projection type image display apparatus has a first lens group having an aspherical lens surface, a second lens group, a third lens group sharing almost all the positive refractive power of the overall system,... | 08/31/1999 |
| 5933284 | Zoom lens A zoom lens, comprises a first lens group, provided in an object side, having a positive refracting power; and a second lens group, provided in an image side from the first lens group, having a negative refracting power; wherein the zoom lens changes magn... | 08/03/1999 |
| 5870234 | Compact wide-angle lens This invention relates to a compact wide-angle lens which consists of five members. The first member and the last member are each divergent lenses of low deviation, which consist of low refractivity crown glass. The second member and the third member are ... | 02/09/1999 |
| 5861999 | Super wide angel lens system using an aspherical lens A retrofocus type super wide angle lens system includes a front lens group of negative power and a rear lens group of positive power, arranged in this order from the object side. The front lens group consists of a negative meniscus first lens element with... | 01/19/1999 |
| 5850312 | Three-unit zoom lens The invention provides a zoom lens system which, albeit having a zoom ratio exceeding 2, is composed of fewer lenses, is of small and low-cost construction, and shows sufficient performance over a range from infinity to a short object distance. The three-... | 12/15/1998 |
| 5808804 | Projection television lens system Six-component projection lens systems for use in projection televisions are provided. From the screen side, the systems preferably have a + - +++ - configuration. The use of a second lens element having a negative power results in improved sagittal modula... | 09/15/1998 |
| 5798873 | Small-sized zoom lens A small-sized zoom lens is disclosed comprising, from front to rear, a first lens unit of positive refractive power and a second lens unit of negative refractive power, zooming being performed by varying the separation between the first and second lens un... | 08/25/1998 |
