Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 7535657 | Zoom lens system and imaging device There is provided a zoom lens system including at least a first lens group GR1 having a positive refractive power, a second lens group GR2 having a negative refractive power, a third lens group GR3 having a positive refractive power, a fourth le... | 05/19/2009 |
| 7342730 | Zoom lens optical system A compact zoom lens optical system suitable for use in a camera using a solid state photographing device and providing excellent correction of color aberrations, high zooming ratio, and telecentricity. The zoom lens optical system includes: a first lens group having... | 03/11/2008 |
| 7203384 | Implement for optically inferring information from a planar jotting surface The present invention relates to a jotting implement that infers hand-jotted information from a jotting surface. The hand-jotted information is any information marked on the jotting surface as a result of writing, jotting, drawing, sketching or in any other manner o... | 04/10/2007 |
| 7199912 | Fourier transform lens system and holographic storage system using same A Fourier transform lens system includes: a first lens group having negative power and a second lens group having positive power disposed at one side of the first lens group with the first lens group and the second lens group being arranged on a common optical axis.... | 04/03/2007 |
| 7173766 | Zoom lens, image magnification projection system and video projector using the zoom lens and rear projector and multi-vision system using the video projector The present invention provides a zoom lens that suppresses the generation of unnecessary light and is suitable for a projection lens. The zoom lens is used as a projection lens of a projector in which a prism is located between the projection lens and a spatial opti... | 02/06/2007 |
| 7145729 | Foldable projection lenses Projection lenses for use with pixelized panels (PP) are provided. The projection lenses have a first unit (U1) separated from a positive second unit (U2) by a distance sufficient to accept a reflective surface (RS) for folding the lens' optical axis. ... | 12/05/2006 |
| 7133220 | Lens for reading an original, method and apparatus for reading an original, and image forming apparatus A lens for reading an original, comprises five lenses as a whole including two positive and two negative lenses, an aspherical surface provided on at least one surface of the five lenses, a construction of four lens groups for five lenses which include a cemented le... | 11/07/2006 |
| 7116489 | Zoom lens and imaging device Disclosed are a zoom lens and an imaging device. The zoom lens has a first lens group with positive refractive power, a second lens group with negative refractive power, a third lens group with positive refractive power, a fourth lens group with positive refractive ... | 10/03/2006 |
| 7092169 | Zoom lens system A zoom lens system, in sequence from an object side to an image side, includes a first lens group having positive refractive power and fixed for gathering incoming light; a second lens group having negative refractive power for changing a focal length of the zoom le... | 08/15/2006 |
| 6954316 | Projection objective Projection exposure device and also projection objective with a lens arrangement which has at least one lens group of negative refractive power, this lens group comprising at least four lenses of negative refractive power, and a lens of positive refractive power bei... | 10/11/2005 |
| RE38465 | Exposure apparatus A projection optical system of the present invention has a first lens group G1 being positive, a second lens group G2 being negative, a third lens group G3 being positive, a fourth lens group G4 being negative, a fifth len... | 03/16/2004 |
| 6606207 | Image reading lens and image reading apparatus using the same The present invention provides a bright image reading lens coping with high resolution and yet having a great depth of focus and a wide angle of field, and an image reading apparatus using the same. The image reading lens includes, in succession from the ... | 08/12/2003 |
| 6473242 | Projection lens The projection lens comprises, in order from the object side of the lens to the modulator side of the lens, a first lens group having a positive power, including a positive lens element, a second lens group including a negative meniscus element having a c... | 10/29/2002 |
| 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 |
| 6366412 | Lens system for reading images and image reader A lens system for reading images, consisting of six lens elements of positive, positive, negative, negative, positive and positive refractive power, respectively, in order from the object side, with a stop positioned between the third lens element and the... | 04/02/2002 |
| 6285507 | Color image reading lens system An optical system for focusing an original image on an image sensor has an optical element disposed at the image-sensor-side end thereof. The optical element has a positive optical power as a whole, and at least one surface of the optical element has a po... | 09/04/2001 |
| 6282031 | Beam shaping optical system A beam shaping optical system which is provided with a first wedge prism having two refractive surfaces defining a first principal section, and a second wedge prism having two refractive surfaces defining a second principal section that is parallel to the... | 08/28/2001 |
| 6268969 | Image forming optical system having diffractive optical element An optical system includes, in order from an object side to an image side, a first lens unit having a positive refractive power and a second lens unit having a negative refractive power, the second lens unit being moved during focusing, wherein the first ... | 07/31/2001 |
| 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 |
| 6115194 | Projection lens By satisfying certain specified conditions, a projection lens having six lens groups and a low F-number of 1.4 is disclosed wherein a maximum angle between a principal ray and the optical axis on the reducing side of the projection lens is 2.5° or less. ... | 09/05/2000 |
| 6104544 | Exposure apparatus A projection optical system of the present invention has a first lens group G1 being positive, a second lens group G2 being negative, a third lens group G3 being positive, a fourth lens group G4 being negative, ... | 08/15/2000 |
| 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 |
| 5999338 | Imaging lens An imaging lens with a wide image angle, that is compact and bright, is composed of a first lens group of negative refracting power which has three lens elements which are of positive, negative, and positive refracting power, respectively, and a second le... | 12/07/1999 |
| 5831770 | Projection optical system and exposure apparatus provided therewith This invention is directed to a bitelecentric projection optical system very well corrected for various distortions, particularly for distortion (including higher-order distortions) as securing a relatively wide exposure area and a large numerical apertur... | 11/03/1998 |
| 5822129 | Projection lens system A projection lens system has a wide angle with small value for back focus, superior telecentric characteristics, and small distortion. The projection lens system includes a first lens group having a negative refractive power and a second lens group having... | 10/13/1998 |
| 5781278 | Projection optical system and exposure apparatus with the same The present invention relates to a both-side telecentric projection optical system and an exposure apparatus equipped with this projection optical system. In particular, the projection optical system has a structure for quite favorably correcting various ... | 07/14/1998 |
| 5699202 | Imaging lens A first lens group having a four-lens configuration of positive, negative, negative, and positive lenses and a second lens group comprising at least two lenses are disposed successively from the object side, while these lenses are made of at least two kin... | 12/16/1997 |
| 5557473 | Wide angle lens A wide angle lens includes, in turn from the object side, a first lens group having a negative refracting power, and a second lens group having a positive refracting power. The first lens group includes, in turn from the object side, a first lens componen... | 09/17/1996 |
| 5548447 | Photographic lens system A photographic lens system comprises, in order from the object end, a positive power element having a concave image end surface, an element having a concave image end surface, a negative power element, a positive power element, a meniscus element of a pos... | 08/20/1996 |
| 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 |
| 5513042 | Lens system with master lens system and conversion lens A lens system includes a master lens system and a conversion lens system. The master lens system has a first lens, a second lens, a third lens, and a fourth lens, which are sequentially arranged from an object side of the lens system to an image side ther... | 04/30/1996 |
| 5513046 | Large aperture retrofocus lens A large aperture retrofocus lens system is composed of first to sixth lenses arranged in this order from the object side. The first lens has a positive refracting power, the second lens has a negative refracting power, the third lens which is a meniscus l... | 04/30/1996 |
| 5383056 | Fourier transform lens assembly and optical information processor employing same 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... | 01/17/1995 |
| 5243468 | Wide angle objective lens A wide angle objective lens has, in succession from the object side, a first lens component which is a positive meniscus lens having its convex surface facing the object side, a second lens component which is a cemented meniscus lens comprising a negative... | 09/07/1993 |
| 5237456 | Projection lens A projection lens consists of a first lens group including a positive lens, a second lens group including a meniscus type lens having a comparatively low refractive power, a third lens group including a bonded negative lens, a fourth lens group including ... | 08/17/1993 |
| 5148320 | Projection lens A projection lens system is for projecting an enlargement, on a display screen, of an image appearing on a faceplate of a cathode ray tube. The system includes six groups. The first group from the screen end is in the form of a positive meniscus. The seco... | 09/15/1992 |
| 4913540 | Telecentric projection lens system A wide-angle telecentric projection lens system for use in enlarged projection at a magnification of about 15-20, that has a brightness of about FNO 1:7, and which covers a wide field of up to about 25 degrees in terms of the half viewing angle... | 04/03/1990 |
| 4900139 | Color corrected projection lens A lens comprising from the image side a first lens unit which is a positive element with at least one aspheric surface; a three element lens unit consisting of a biconcave element, a biconvex element and another positive component, in that order; a third ... | 02/13/1990 |
| 4859044 | Large aperture lens system for use in a copier A copier lens system having a large aperture has a basic structure of 6-unit-6-element arrangement which is constructed by separating the first and second lenses of the orthmeta type lens system.... | 08/22/1989 |
