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5587838 Projection lens unit  
A projection lens unit using the principles of liquid-cooled, optical coupling is disclosed. In particular, the present invention automatically re-focusses a lens unit that is being exposed to...
5572364 Projection lens system  
A projection lens system for projecting an enlarged image onto a display screen front an image appearing on a faceplate of a cathode ray tube utilizes at least six lens groups. The first lens...
RE35310 Color corrected projection lens  
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...
5539580 Projection optical system for a liquid crystal projector  
A projection optical system for a liquid crystal projector having a plurality of lenses and projecting an image from liquid crystal display devices onto a screen including a front lens portion...
5519537 Retrofocus projection lens  
A retrofocus projection lens comprises a first lens group having a negative refracting power, a second lens group having a positive refracting power, and a third lens group having a positive...
5499139 Ultra-wide field of view, broad spectral band helmet visor display optical system  
An optical display system in which an image is projected onto a combiner surface at a significant bending angle effectively compensates asymmetric aberrations, including quadratic, linear and...
5475534 Projection lens systems for projector  
A projection lens system includes a cathode ray tube which projects the image to be projected on the screen through a set of six projection lens, which include non-spherical surfaces. The...
5463387 Optical mouse and resin lens unit  
An optical mouse comprises an illumination system for converging light emitted from a light emitting element to a light pattern of a mouse pad, an image forming system for forming an image of the...
5455713 High performance, thermally-stabilized projection television lens systems  
High performance projection lens systems for use in projection televisions are provided. The systems include A, B, C, and CR lens units. The A unit is composed of a negative subunit and a positive...
5452132 Projection lens system for rear type projection television  
A projection lens system for use in a rear type projection television. The system includes a first lens of which at least one surface is aspherical, the center portion of which has little optical...
5404246 Projection lens system  
A projection lens system has a first lens to a sixth lens which are serially arranged in this order from a screen side. The first lens has a meniscus configuration in which a convex surface is...
5388003 Projection lens system  
A projection lens system which produces a smaller amount of residual chromatic aberrations and which will exhibit satisfactory performance even if it is used as a long-focus lens. The projection...
5373394 Projection lens system for a video projector  
A projection lens system for a video projector for projecting a color image which is generated by combining red, green and blue images from an image source on a large screen. One lens element of a...
5371628 Projection lens incorporating a pair of matching plastic lenses  
This projection lens for a projection television includes coaxially in order towards the face plate of the CRT: a first lens of negative power, both of whose surfaces are aspherical; a second lens...
5369521 Scanning type projector  
A scanning type projector of a refractive optical system which has a wide field and projects with high resolution power. The scanning type projector projects an object to be projected by scanning...
5367405 Projecting lens  
First, second, third, and fourth set lenses are located in this order from the direction of a screen. The first lens group comprises a plastic lens having a weak refracting power and at least one...
5357373 Image projection lens  
A projection lens has a five-group structure, in which a first-group lens is a positive lens, a second-group lens is a negative lens, third- and fourth-group lenses are respectively positive...
5353156 Projection lens system  
A projection lens system includes a first lens group for correcting spherical aberration and coma aberration, a second lens group for correcting chromatic aberration, a third lens group for...
5349472 Coupled lens assembly  
A coupled lens assembly comprises a plurality of lens units coupled by an intermediate layer disposed between the adjoining lens units, the intermediate layers being formed of an additional type...
5329363 Projection lens systems having reduced spherochromatism  
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...
5321551 Projection lens apparatus for rear projection television  
A projection lens apparatus for a rear projection television. The projection lens apparatus includes a first lens in which the negative power of the lens gradually increases from the central...
5319495 Zoom lens  
A zoom lens includes, from the image side to the subject side, a first lens group having a negative overall power and a second lens group having a positive overall power. The lens groups are...
5309283 Hybrid, color-corrected, projection TV lens system  
A projection lens system for projecting an image from a cathode ray tube (CRT) onto a screen is provided which includes in order from the image end: a first lens unit (U1), a second positive lens...
5296967 High speed wide angle projection TV lens system  
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...
5255122 Projection lens system for projection type television  
A projection lens system for a projection type television having a cathode-ray tube with a panel having a fluorescent inner surface for projecting an image onto a screen. The projection lens...
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...
5212597 Projection lens system for projectors  
A projection lens system for projectors, which has, consecutively from the side of the viewing screen, a first positive lens component L1, a second plastic lens component L2, third to sixth lens...
5208891 Fiber-optic viewgraph projector  
A viewgraph projector having a light above the transparency receiver and jecting downward through the transparency is provided. The projected image is received below the transparency by a...
5168351 Short focal length video color projector employing dichroic mirror block  
A video color image projector which includes a block of crossed dichroic mirrors for combining the light rays from image rasters on respective monochrome image display devices and a projection...
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...
5066113 Projecting lens  
A projecting lens comprising, when viewed from a screen, a first lens group having positive refracting power and an aspherical lens thereof; a second lens group having positive refracting power, a...
5048940 Projection lens for projector  
A lens for a highly precise and fine projector that may response to a television of high quality must have a large aperture ratio and a wide field angle, and chromatic aberrations should be well...
5026149 Projection lens system  
A projection lens system for projecting a magnified image from an image source (3, 4, 5) on a projection screen (10) comprises from the image end successively a first, positive lens group (L1) and...
4993816 Projection lens system for use in projection television  
A six-element projection lens system for use in a projection television is disclosed which comprises, in order from the screen side, a positive first lens, a positive meniscus second lens, a...
4989961 Projection lens systems for use in projection television  
A projection lens system including seven lens elements for use in a projection television which comprises, in order from the screen side, a first lens unit composed of a positive lens element, a...
4981352 Projection display device  
A projection display device having a dichroic prism having at least two incident surfaces and an emergence surface, separate color image emitting elements being disposed in opposing relation to...
4976525 Projection lens system for projectors  
Described herein is a projection lens system, comprising from the screen side a positive first lens unit of weak power consisting of a plastic meniscus, a positive or negative second lens unit of...
4948237 Projection lens system  
In a projection system wherein an optical system comprising a first lens for correcting a spherical aberration dependent on the aperture length, a second lens for enlargement and a third lens for...
4924244 Lens system for projection type television  
A lens system for a projection type television, having high focusing performance, a wide field angle and a reduced size. The lens system is composed of seven lenses, which are arranged...
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...
4815831 Projection lens with color correction  
A partially color corrected projection lens having three groups comprising from the image end a first group serving to correct aberrations, a second group supplying essentially all of the positive...
4801196 Wide angle projection lens  
A wide angle projection lens which comprises from the image end a first lens unit of negative power having at least one aspheric surface, a second positive lens unit comprising at least two...
4792217 Projection lens system  
A projection lens system is disclosed which comprises, in order from a screen side, a first lens element having a positive focal length, a second lens element having a negative focal length, a...
4792218 Projection lens for high definition TV  
A high definition projection lens for projecting on a screen an enlargement of an image appearing on a high resolution CRT is disclosed. The projection lens comprises a first lens having a...
4778264 Refraction-type projection lens  
A projection lens for projecting an image appearing on a CRT onto a large-sized screen, comprising, from the screen side a first lens structure including a meniscus lens having both surfaces...
4776681 Projection lens  
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...
4776682 Projection lens system with variable air space  
A projection lens system comprises a first group of lenses having at least one variable spacing for correcting aberration, and a second group of lenses having a variable spacing for focusing with...
4770513 Projection lens  
A projection lens for projecting an image onto a screen includes, in succession from the screen side, a first lens component having a positive refractive power, a second lens component having a...
4733953 Color corrected projection lens  
A color corrected projection lens with a large aperture ratio and a wide angle of view for producing on a screen an enlargement of an image appearing on a CRT, the lens having sequentially from...
4711535 Ring field projection system  
The present invention is directed to Optical Lithographic Systems which are particularly adapted, among many other possible uses, for use in effecting exposure of photoresist-coated semiconductor...