| Patent Number |
Title Of Patent |
Date Issued |
| RE39911 |
Wide field of view projection lenses for compact projection lens systems employing pixelized pan |
November 6, 2007 |
| A projection lens for use with LCD panels is provided. The lens has a first lens unit which includes a strong negative lens element having an aspherical surface which provides distortion correction, and a second lens unit which includes a first lens subunit separated by an airspace f |
| RE39424 |
Telecentric lens systems for forming an image of an object composed of pixels |
December 12, 2006 |
| Telecentric lens systems for use with pixelized panels, such as LCD or DMD panels, are provided. The systems have a long aperture stop to object distance (ASOD) and a high level of aberration correction, including a high level of lateral color correction. Preferably, the systems also hav |
| RE35775 |
Zoom lens with short back focal length |
April 21, 1998 |
| A two lens unit zoom lens of plus, minus configuration where the rear negative group provides the primary variator function and the positive first lens unit consists of a negative sub-unit and a positive sub-unit and where the sub-units may move differentially during zooming. |
| RE35310 |
Color corrected projection lens |
August 6, 1996 |
| A projection lens in which a lens unit which may comprise one or two elements is closely coupled at the object end of the lens to a cathode ray tube. At the image end is a lens unit of overall weak optical power which comprises from the image end a first positive element followed by a |
| 7230770 |
Projection lenses having color-correcting rear lens units |
June 12, 2007 |
| 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). The lenses are telecentric on the short conjugate side, have a large field of view in the direction of the long conjugate, have low |
| 7145729 |
Foldable projection lenses |
December 5, 2006 |
| 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. The lenses are telecentric on the |
| 7133084 |
Lens systems for projection televisions |
November 7, 2006 |
| Projection lens systems for use with cathode ray tube (CRT) projection televisions are provided which have positive first lens units (U1) and negative second lens units (U2) where the negative second lens units are customized in terms of at least one optical property for at least two of |
| 7123421 |
Compact high performance zoom lens system |
October 17, 2006 |
| A compact high performance objective zoom lens system is disclosed that provides optimum optical performance over the entire zoom focal length range at focus distances from close to infinity. The system comprises, from object space to image space, one focusing objective lens group (c |
| 7019793 |
Lens systems for projection televisions |
March 28, 2006 |
| Projection lens systems for use with cathode ray tube (CRT) projection televisions are provided which have positive first lens units (U1) and negative second lens units (U2) where the negative second lens units are customized in terms of at least one optical property for at least two of |
| 7002753 |
Color-corrected projection lenses for use with pixelized panels |
February 21, 2006 |
| Projection lenses for use with pixelized panels (PP) are provided. The projection lenses have first and second lens units (U1,U2), with the first lens unit having a negative power and the second lens unit having a positive power. The first lens unit has a first lens element (L1) having |
| 6980365 |
Diffractive lens optical design |
December 27, 2005 |
| An optical system for use in a head-mounted display is provided which includes a microdisplay (4) and a magnifier (10) for producing a magnified image of the microdisplay for viewing by a human eye. The magnifier (10) includes a diffractive surface and has in order: a first element (1) |
| 6791629 |
Lens systems for projection televisions |
September 14, 2004 |
| Projection lens systems for use with cathode ray tube (CRT) projection televisions are provided which have positive first lens units (U1) and negative second lens units (U2) where the negative second lens units are customized in terms of at least one optical property for at least two of |
| 6563650 |
Compact, telecentric projection lenses for use with pixelized panels |
May 13, 2003 |
| Telecentric projection lenses for use with pixelized panels (PP) are provided. The projection lenses have a negative first unit (U1) which has at least one negative meniscus element (N1) having at least one aspheric surface and a positive second unit (U2) which has at least one positive |
| 6563648 |
Compact wide field of view imaging system |
May 13, 2003 |
| The present invention provides an enhanced viewing eyepiece for a micro-display. In one embodiment, the invention is an optical imaging system that includes a prism having a first face directed toward a display to receive light from the display and direct it through a second face, a |
| 6509937 |
High performance projection television lens systems |
January 21, 2003 |
| Projection lens systems for use in CRT projection televisions are provided. The lens systems include a negative lens unit (U4) which is associated with the CRT during use of the lens system and four lens elements (L1, L2, L3, CR) on the image side of the negative lens unit (U4). Three of |
| 6445512 |
Projection television lens systems having improved modulation transfer functions |
September 3, 2002 |
| 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 surface (S.sub.2) which has a best |
| 6417971 |
Zoom projection lens having a lens correction unit |
July 9, 2002 |
| A zoom projection lens for use with LCD or DMD panels is provided. The lens has two units U1 and U2, which are moved relative to one another for zooming. It also has a corrector unit (CR) at a fixed distance from the LCD or DMD panel (PP). The corrector unit, which may be a color correct |
| 6411444 |
Lenses for electronic imaging systems having long wavelength filtering properties |
June 25, 2002 |
| Lenses for use with electronic imaging systems, e.g., systems employing CCDs, are provided. The lenses employ at least two lens elements, at least one of which is a dyed plastic lens element whose average percentage transmission for wavelengths between 400 nm and 550 nm is greater than i |
| 6324014 |
Wide field of view projection lenses for compact projection lens systems employing pixelized pan |
November 27, 2001 |
| A projection lens for use with LCD panels is provided. The lens has a first lens unit which includes a strong negative lens element having an aspherical surface which provides distortion correction, and a second lens unit which includes a first lens subunit separated by an airspace from |
| 6297860 |
Partial color-corrected projection lens system |
October 2, 2001 |
| Projection lens systems (13) for use in projection televisions are provided. The systems are characterized by a screen side lens unit (U1) which: (1) has a weak optical power; (2) has a negative, aspherical lens element composed of a high dispersion material; and (3) has a positive l |
| 6195209 |
Projection lenses having reduced lateral color for use with pixelized panels |
February 27, 2001 |
| Projection lens for use with pixelized panels are provided which consist of a first lens unit which has a negative power and a second lens unit which has a positive power. The V-values and Q-values of the lens elements of the first and second lens units are selected so that the projectio |
| 6094311 |
LCD projection lens |
July 25, 2000 |
| A projection lens for use with a pixelized panel (LCD) is provided. The lens has two positive lens units with an aperture stop between them. The optical powers of each of the units are such that f1 is substantially shorter than f2, where f1 and f2 are the focal lengths of the first lens |
| 6025959 |
Color corrected projection lenses for use with curved faceplate cathode ray tubes |
February 15, 2000 |
| 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) provides color correction for the len |
| 5969876 |
Projection lenses having large back focal length to focal length ratios |
October 19, 1999 |
| A projection lens for use with LCD or DMD panels is provided. The lens has three lens units, the first unit having a negative power and at least one plastic lens element having two aspheric surfaces, a second lens unit having a negative power or a weak positive power and at least one col |
| 5969874 |
Long focal length projection lenses |
October 19, 1999 |
| A projection lens for use with LCD or DMD panels is provided. The lens has three lens units, the first unit having a weak power, at least one aspheric surface, a high dispersion negative lens element, and a low dispersion positive lens element, the second lens unit having a positive |
| 5870228 |
Projection lenses having larger back focal length to focal length ratios |
February 9, 1999 |
| A projection lens for use with LCD or DMD panels is provided. The lens has three lens units, the first unit having a negative power and at least one plastic lens element having two aspheric surfaces, a second lens unit having a negative power or a weak positive power and at least one col |
| 5841587 |
LCD projection lens |
November 24, 1998 |
| A projection lens for use with LCD panels is provided. The lens has two aspherical meniscus elements which are concave to each other and are located in the vicinity of the lens' aperture stop and a color-correcting doublet which provides most of the positive optical power of the lens. Th |
| 5808804 |
Projection television lens system |
September 15, 1998 |
| 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 modulation transfer functions (MTFs) at |
| 5745301 |
Variable power lens systems for producing small images |
April 28, 1998 |
| Variable power lens systems for use with electronic imaging systems, e.g., systems employing CCDs, are provided. The systems take advantage of the fact that the images detected by electronic imaging systems are small, e.g., the image diagonal can be 5.5 millimeters or less. The lens syst |
| 5625495 |
Telecentric lens systems for forming an image of an object composed of pixels |
April 29, 1997 |
| Telecentric lens systems for use with pixelized panels, such as LCD or DMD panels, are provided. The systems have a long aperture stop to object distance (ASOD) and a high level of aberration correction, including a high level of lateral color correction. Preferably, the systems also hav |
| 5559637 |
Field curvature corrector |
September 24, 1996 |
| A field curvature corrector is provided which has a positive power and a positive exact field curvature (EFC) value for at least one principal ray, where the EFC value is given by:the summation being taken over the surfaces of the corrector, and for each of the surfaces, n is the index o |
| 5329363 |
Projection lens systems having reduced spherochromatism |
July 12, 1994 |
| A projection lens system for projecting an image from a cathode ray tube (CRT) onto a screen is provided. The spherochromatic aberration of the system is reduced through the use of a first lens element which has (i) a positive power on axis and at least one aspheric surface which causes |
| 5296967 |
High speed wide angle projection TV lens system |
March 22, 1994 |
| Projection lens systems for use in projection televisions are provided. The lens systems include a strong positive element which provides a majority of the power of the lens, a strong negative unit which provides most of the correction for the field curvature of the lens system, and four |
| 5268792 |
Zoom lens |
December 7, 1993 |
| This invention relates to a compact zoom lens. The zoom lens comprises of small number of elements arranged in three groups. The first group has negative refractive power, the second group has positive refractive power and the third group has negative refractive power. The air space betw |
| 5218480 |
Retrofocus wide angle lens |
June 8, 1993 |
| A wide angle lens system of the retrofocus type is provided which includes two lens units. The first lens unit is of negative power and includes a combination of a positive element having a high dispersion and a negative element having a low dispersion for correction of lateral color. Th |
| 5200861 |
Lens systems |
April 6, 1993 |
| A lens system is provided which includes two lens units. The first lens unit includes two meniscus lenses whose concave surfaces face each other and the second lens unit has a positive power. The system can be configured to have a wide field of view and/or to be telecentric. In its b |
| 4971428 |
Catadioptric zoom lens |
November 20, 1990 |
| A catadioptric zoom lens comprising from the object end a first catadioptric group including a relay subgroup for forming an intermediate image, zoom relay, the zoom relay including a positive variator group and a negative power compensator group, the variator group comprising a first |
| 4963007 |
Color corrected projection lens |
October 16, 1990 |
| A projection lens in which a lens unit which may comprise one or two elements is closely coupled at the object end of the lens to a cathode ray tube. At the image end is a lens unit of overall weak optical power which comprises from the image end a first positive element followed by a |
| 4936661 |
Zoom lens with short back focal length |
June 26, 1990 |
| A two lens unit zoom lens of plus, minus configuration where the rear negative group provides the primary variator function and the positive first lens unit consists of a negative sub-unit and a positive sub-unit and where the sub-units may move differentially during zooming. |
| 4776681 |
Projection lens |
October 11, 1988 |
| A projection lens for a cathode ray tube consisting from the image end of a first lens unit including an element of overall meniscus shape and of positive power at the optical axis, a second lens unit which includes of a biconvex element and supplies the majority of the positive optical |
| 4758073 |
Zoom lens |
July 19, 1988 |
| A zoom lens having a range of equivalent focal lengths (EFL) which extend from a dimension above the diagonal of the film plane of the lens to a telephoto focal length, where the lens comprises three groups of which two are movable to vary the EFL. |
| 4757372 |
SLR zoom camera |
July 12, 1988 |
| A compact SLR camera embodies a zoom taking lens and a diagonal reflecting member along the axis of the taking lens that diverts the optical ray path coming through the lens element forwardly thereof to a viewing screen. The reflecting member is movable along the axis of the taking lens |
| 4755028 |
Projection lens with an aspherical corrector lens element |
July 5, 1988 |
| A projection lens for a cathode ray tube consisting from the image end of a first lens unit including an element of overall meniscus shape and of positive power at the optical axis, the first lens unit has an object side surface convex to the aperture stop, a second lens unit which consi |
| 4749268 |
Autofocusing zoom lens |
June 7, 1988 |
| An automatic focusing zoom lens which comprises a first positive group, a second variator group, a third compensator group, and a relay lens including an autofocus detector which receives a portion of the light entering the fourth group and controls a motor which drives the compensat |
| 4685774 |
Projection lens |
August 11, 1987 |
| A compact projection lens for a cathode ray tube having a field angle as great as 73.degree. which may utilize only three lens elements where the first lens element from the image side has two aspheric surfaces in the shape of an overall meniscus which goes from positive optical power at |
| 4682862 |
Projection lens |
July 28, 1987 |
| A projection lens system adapted to project an image from a cathode ray tube and consisting from the image end of a first lens unit of weak optical power, a second lens unit of strong optical power including a biconvex glass element, a third lens unit of strongly negative optical pow |
| 4629291 |
Zoom lens |
December 16, 1986 |
| A zoom lens having a range of equivalent focal lengths from a dimension below the diagonal of the image frame to above with a zoom ratio of substantially three to one or greater having a second negative lens unit of relatively strong optical power where the second lens unit comprises a |
| 4620774 |
Internal focusing lens |
November 4, 1986 |
| An internal focusing lens comprising from the object end a first positive group, a second positive group and a third negative group, the second group being axially movable to focus the lens. |
| 4462664 |
Zoom lens |
July 31, 1984 |
| A zoom lens having a large zoom ratio and capable of close focusing comprising a first positive grouping movable axially for focusing, a second negative grouping, and a third positive grouping movable simultaneously with the second grouping, but in opposite directions to vary the equ |
| 4258980 |
Retrofocus lens |
March 31, 1981 |
| A retrofocus lens subtending a field angle up to 84.degree. or more characterized by compactness, fast relative aperture, and good aberration correction. These characteristics are obtained by selection of the relative powers of a front negative and a rear positive group, and the disp |
