Matches 201 - 250 out of 516 < 1 2 3 4 5 6 7 8 9 10 11 >
Match Document Document Title
5699201 Low-profile, high-gain, wide-field-of-view, non-imaging optics  
A two stage non-imaging optical concentrator providing high concentration while providing a low aspect ratio and a wide field of view. The invention includes a non-imaging refractive member and a...
5677797 Method for correcting field curvature  
A method for producing a lens system is provided in which an exact field curvature (EFC) value is determined for at least one principal ray, the EFC value being given by: EFC=-Σ(n'-n)c/nn' the...
5666233 Two-unit zoom lens system having a high zoom ratio  
The invention provides a two-unit zoom lens system comprising a front unit G F of positive refracting power and a rear unit G R of negative positive power which achieves a zoom ratio as high as...
5661606 Zoom lens with high zoom ratio and including two lens units  
An inexpensive, compact and relatively easy-to-manufacture zoom lens is composed of a small number of lenses which can be mass produced favorably. The zoom lens includes a negative lens unit and a...
5659426 Zoom lens  
A zoom lens has a first lens unit which is fixed in position during zooming and has a positive refractive power, a second lens unit which is movable upon zooming and has a negative refractive...
5654831 Refractive ellipsoid optical surface without spherical aberration  
According to the present invention, light is provided to an elliptical optical surface (102) separating first and second homogeneous optical media (104), (106) that cause collimated light (108)...
5642229 Projection lens unit  
A projection lens unit includes, in accordance with the order of disposition from a screen side, a first lens group including a positive meniscus lens, a second lens group including a double convex...
RE35534 Fresnel lens with aspheric grooves  
A Fresnel lens formed of an infrared transmitting material has a grooved surface. The grooves all extend to the same depth, and the distances between successive grooves vary across the lens. In a...
5631780 Wide-angle lens  
A retrofocus type wide-angle lens for achieving a highly stable imaging performance and a reduction in spherical aberrations, astigmatism, and coma, while allowing for a large aperture and a large...
5602676 Compact zoom lens with reduced aspheric decenter sensitivity  
A zoom lens having two units of lens components including from the object side a positive optical unit and a negative optical unit. The positive optical unit includes two lens components, a weak...
5600492 Surface-curved optical element adapted for emergence and incidence of parallel light rays  
The invention relates to an optical element being conveniently useful, for example as an external cover of transmitter and/or receiver for optical communication and more particularly to a...
5589896 Adjustable indirect ophthalmoscopy lens  
An indirect ophthalmoscopy lens (10) comprises two or more elements (16, 30). The elements (16, 30) are movable by the physician relative to each other to vary the magnification provided in an...
5583697 Rear-focus type zoom lens with movable second and fourth lens units for zooming and focusing  
A rear focus type zoom lens including, in succession from the object side, a first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit of...
5583702 Optical system for enlarging images  
Optical system intended to enlarge images, such as those produced by a television set. For this purpose is used an optical system such as an assembly including at least one thick lens (12) or its...
5572367 Aspheric lens for simultaneously collimating and shaping a laser diode beam  
An outwardly divergent and elliptic input laser beam is converted into a collimated and circular laser beam using a single aspheric lens. An input surface of the aspheric lens has a convex...
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...
5566027 Photocurable resin composition and optical lens produced therefrom  
A resin layer having an improved durability may be obtained by curing a photocurable resin composition, including: (A) a polyfunctional urethane-modified polyester (meth)acrylate comprising a...
5559637 Field curvature corrector  
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: ...
5557472 Fast aspherical lens system  
A fast lens system is provided which includes a front lens group having a negative power, a diaphragm, and a rear lens group having a positive power, arranged in this order from a side of an object...
5557471 Lens for depositing target material on a substrate  
A method of depositing a thin layer of a target material on a substrate is disclosed. The method comprises illuminating the material with at least one elliptical laser beam so that a desposition...
5543970 Zoom lens system  
A zoom lens system according to the present invention comprises, from the object side to the image side, a first lens unit with a positive refractive power including a negative high dispersion lens...
5528429 High-magnification zoom lens system  
A zoom lens system has, from the object side to the image side, a first lens unit of positive power, a second lens unit of positive power and a third lens unit of negative power. Each lens unit has...
5526190 Optical element and device for providing uniform irradiance of a surface  
An optical element uniformly distributes radiant energy on a target surface, such as for discharging an area of a photoreceptor in a xerographic printer, or for applying infrared energy to dry an...
5526181 Dynamic aberration corrector for conformal windows  
A method and apparatus (30) for compensating for optical aberration created by a conformal window (60). The apparatus (30) comprises a one-dimensional corrector plate (32) for providing a varying...
5491765 Light source devices for endoscopes  
A light source device for endoscopes comprising a light source lamp, a light guide fiber bundle and a collector optical system of the light source device for collecting rays emitted from the light...
5485317 Optical system for light emitting diodes  
The diode is incorporated in a fixed manner on the optical axis of a carrier lens. The carrier lens consists of a front portion with an outer transverse surface, formed concave towards the emitted...
5485316 Illumination optical system for endoscopes  
An illumination optical system for endoscopes which comprises a lens component having at least one aspherical surface in a shape F(h) satisfying the condition mentioned below, and satisfies...
5477388 Inverse telescopic wide angle lens  
An inverse telescopic wide angle lens comprises a diaphragm; a front lens group of an integral positive or negative refractive power, positioned in the object side in front of the diaphragm and...
5477389 Fast ultra-wide angle lens system  
A fast ultra-wide angle lens system is provided which includes a front lens group having a negative power, a diaphragm, and a rear lens group having a positive power, arranged in this order from a...
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...
5463496 Image pickup optical system which minimizes the effects of spurious signals  
An image pickup optical system having an image pickup lens system having in turn a plurality of lenses arranged in multiple stages for forming an image of an object on an image plane of an image...
5459802 Optical lensed coupling device  
A light image is made irregular at an incident part of a fiber, influence of displacement of the fiber against a couping efficiency is reduced and evaluation of a lens can be carried out as usual....
5448415 Device for emitting light diverging along imaginary plane  
There is disclosed a device for emitting light diverging along an imaginary plane. This device includes a light source, a collimating lens, and a cylindrical optical element which are mounted...
5444574 Electronic image pickup apparatus equipped with means for eliminating moire  
An electronic image pickup apparatus comprising an imaging optical system for forming images of an object and image pickup device having light receiving surface configured so as to sample the...
5434710 Zoom lens system comprising three lens units  
A zoom lens system comprising, in order from the object side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power and a third lens unit...
5428480 Zoom lens having weak plastic element  
A zoom lens suitable for an inexpensive camera has a front positive lens group and a rear negative lens group. Both groups move for zooming with the rear negative group providing most of the...
5424717 Laser light transmitter and proximity detector  
A laser light emitting diode (1, 2) situated at a focal point of a specially shaped lens (3, 4) produces a very thin intense fan-shaped beam. One or two such laser light transmitters are used to...
5420722 Self-registering microlens for laser diodes  
A cylindrical microlens is mounted directly to a laser diode die by using reference edges touching the die at the emitting face and at the top face. Three edges are used to have a stable mounting....
5418646 Wide-angle zoom lens system having a high varifocal ratio  
A zoom lens system comprising, in order from the object side, a first lens unit which has a positive refractive power and is kept fixed during zooming, a second lens unit which has a negative...
5406416 Wideangle-range-covering zoom lens  
A wideangle-range-covering zoom lens comprises a first lens group having a negative refracting power, a second lens group having a positive refracting power, which is arranged coaxially with the...
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...
5400182 Composite glass and resin optical element with an aspheric surface  
In order to provide an optical element with an aspheric surface, as well as a process by which the optical element can be mass-produced with high efficiency and consistent precision, the improved...
5400101 Zooming finder  
An improved zooming viewfinder includes, in order from the object side, a positive first lens group, a negative second lens group that has a zooming capability and which is capable of moving along...
5396367 Zoom lens assembly  
A zoom lens assembly includes, in succession order from the object side, a first fixed lens group of a positive refractive power including a negative lens, a positive lens and a positive meniscus...
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...
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...
5353072 Aspherical spectacle lens  
In an aspherical spectacle lens having a negative degree and an aspherical surface of rotational symmetry located on an object side, a surface power of the aspherical surface of rotational symmetry...
5353159 Three-unit compact zoom lens system  
This invention relates to a three-unit compact zoom lens system having a zoom ratio of about 2, whose telephoto ratio at the wide angle end is as short as 1.3 or lower and in which the lens...
5343330 Double refraction and total reflection solid nonimaging lens  
A nonimaging lens consists of a solid body of light-propagating material defining a first light-refracting surface, a second light-reflecting surface and a third light-refracting surface. To...
5325236 Ultra-wide-angle type zoom lens  
An ultra-wide-angle type zoom lens is disclosed, comprising, in the order from the object side, a negative first lens unit, a negative second lens unit and a positive third lens unit, wherein...
Matches 201 - 250 out of 516 < 1 2 3 4 5 6 7 8 9 10 11 >