Matches 251 - 300 out of 516 < 1 2 3 4 5 6 7 8 9 10 11 >
Match Document Document Title
5313331 Zoom lens system having a short total length  
The present invention relates to a zoom lens system which comprises ten or less lenses, has a very short total length and a small front lens diameter, is reduced in size, weight and cost and has a...
5311364 Reading lens for scanner  
A reading lens for a scanner to read an original in a reduced magnification, the lens comprising six lenses, i.e., from a first lens to a sixth lens in order on an optical axis. The first lens is a...
5303087 Retrofocus type lens  
A retrofocus type lens having a plurality of lenses divided into three lens units, or, in the order from a screen, a first lens unit, a second lens unit and a third lens unit, wherein letting the...
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 unit...
5270825 Imaging optical system having a moire elimination effect  
An imaging optical system for forming images of objects on an image surface. The optical system includes an aspherical surface that functions to reduce spatial frequency response of the optical...
5260828 Methods and means for reducing temperature-induced variations in lenses and lens devices  
A lens composed of a single material and having at least one refractive surface on one face and a kinoform on the other face. The purely refractive between the surfaces varies dimensionally and in...
5251073 High-aperture wide angle lens  
A high-aperture wide angle lens consisting of a divergent action group on the lens side, an air space corresponding to 0.3 to 0.7 times or 0.25 times to 0.45 times the total overall height of the...
5233473 Optical system for endoscopes  
An optical system for an endoscope has, in order from its object side, an objective lens system having a first lens unit with a negative refractive power, a second lens unit with a positive...
5231379 Automobile head-up display system with apparatus for positioning source information  
An optical display system (10) presents visual source information to an observer (18) The display system includes a vision unit (14) that has reflective surfaces (16) through which the observer can...
5231540 Compact zoom lens system  
The invention relates to a compact, lightweight and inexpensive zoom lens system which, even when used with a small image sensor, allow the convex lenses to have a sufficient peripheral thickness...
5221994 Zoom lens of rear focus type  
A zoom lens is disclosed, having four lens units of positive, negative, positive and positive refractive powers in this order from the object side, the focal length being varied by moving the...
5218480 Retrofocus wide angle lens  
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...
5216547 Small three-unit variable focal length lens system  
A variable focal length lens system having, in the order from the object side, a first positive lens unit, a second positive lens unit and a third negative lens unit. In order to vary the focal...
5216545 Objective lens system for microscopes  
An abjective lens system for microscopes consisting of a lens component having a convex surface on the image side and arranged on the extremely object side, and at least one lens component arranged...
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 L 1 , a second plastic lens component L 2 , third to sixth...
5206759 Image relaying optical system  
An image transmission optical system wherein a lens unit serving for relaying an image for a unit relaying distance consists of two bar shaped cemented lens components, and each of said lens...
5204781 Infinite large-aperture lens system with aspherical surfaces  
A large-aperture lens system with a lens having aspherical surfaces to be used to read out optical information and to be used in optical communication transmission systems or the like. The lens in...
5200861 Lens systems  
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...
5189558 Vari-focal system having short total length  
A vari-focal lens system having short total length comprising, in the order from the object side, a vari-focal subsystem consisting of a first lens unit having a positive refractive power and a...
5184251 Vari-focal lens system  
A vari-focal lens system including, in the order from the object side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, an aperture stop,...
5177605 Optical system for endoscopes and endoscopes using same  
In order to enable to sufficiently deflect the viewing direction for a distal end having an end surface substantially perpendicular to the optical axis of an objective optical system and minimize...
5173809 Objective lens system of optical information recording/reproducing apparatus  
An object lens system consists of a converging lens which has both surfaces formed of a convex aspherical surface and having a radius of curvature which is increased as it goes toward the periphery...
5168404 Optical element and glass blank for producing the optical element  
Disclosed is a glass blank used in a producing process for molding an optical element by heating a glass material and press molding the glass material in a mold having optical functional surfaces....
5162844 Image projection apparatus  
An image projection apparatus including a projection lens system projecting an image of a transparent original onto an image receiving surface with a variable magnification and an illumination...
5161061 Compound aspherical lens  
A compound aspherical lens comprising: a hard lens; a soft lens laminated to the hard lens in a direction of the optical axis; and a lens supporting surface formed around the effective diameter of...
5155631 Method for fabrication of cylindrical microlenses of selected shape  
The present invention provides a diffraction limited, high numerical aperture (fast) cylindrical microlens. The method for making the microlens is adaptable to produce a cylindrical lens that has...
5140608 Optical system for focusing a light beam on to an image plane  
An optical system for focusing a light beam on to an image plane particularly suited for compensating for manufacturing tolerances associated with laser diodes having variable divergence and...
5139342 Photographic lens system  
A photographic lens system comprising, in the order from the object side, a first lens component which is designed as a cemented doublet consisting of a positive lens element and a negative lens...
5117309 Vari-focal lens system having graded refractive index lens  
A compact vari-focal lens system having a high vari-focal ratio, comprising a plurality of lens units including at least one lens unit having a positive refractive power and at least one lens unit...
5099361 Projection lens and projection television system using the same  
A projection lens for projecting images displayed on an image display device having angle-of-view dependency has high image focusing characteristics corresponding to high definition images, wide...
5086356 Compact zoom lens system  
A compact zoom lens system having from the object side to the image side a first lens unit of positive refractive power, a second lens unit of negative refractive power with a first variable air...
5081639 Laser diode assembly including a cylindrical lens  
The present invention provides a diffraction limited, high numerical aperture (fast) cylindrical microlens. The method for making the microlens is adaptable to produce a cylindrical lens that has...
5071238 Telescopic camera  
Disclosed is a lens system for a telescopic camera comprised of a primary lens, a secondary lens and a tertiary lens. The primary lens is a positive lens having a convex front surface and an...
5067803 Photographic wide angle lens  
Described herein is a photographic wide angle lens which is composed of, from the object side thereof, a first lens of positive meniscus having a convex surface on the object side, and a second...
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...
5059009 Endoscope relay lens  
An endoscope relay lens is disclosed for transmitting an optical image along a narrow cylinder. Relay lenses are typically utilized in pairs to constitute a relay lens set and one or more sets are...
5054904 Aspheric lens blank  
The present invention provides an aspherical spectacle lens blank. The lens blank is generally circular in shape and includes a central circular zone which is surrounded by three or more concentric...
5055922 Color TV projection lens system  
Disclosed is an improved color projection TV lens system which provides reduced chromatic aberration and improved chromaticity. These improvements are achieved by incorporating a light absorbing...
5054897 Plastic zoom lens  
A plastic zoom lens has a first group of lenses having negative refracting power and arranged on an object side of the zoom lens; a second group of lenses having positive refracting power and...
5052787 Zoom finder  
A zoom finder can be provided which ensures high magnification and satisfactory view-finding without the need to increase the size. A positive lens which is movable along the optical axis is...
5050979 Eyeglass lens  
An improved eyeglass lens which includes a front and back surface, one of which is refractive surface. The lens is defined by a meridian on the refractive surface which substantially increases for...
5050973 Symmetrical lens system for use in copying machine  
A symmetrical lens system comprising, as arranged from the object side toward the image side, a first lens in the form of a positive meniscus lens having its convex surface directed toward the...
5050974 Optical system for endoscopes  
An optical system for endoscopes so adapted as to be usable with video endoscopes, comprising an imaging lens system equipped with an aperture stop and a field lens component arranged on the image...
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...
5048939 Zoom lens system  
A zoom lens system comprises, from an objective sequentially, a first lens group (1) having a positive power, a second lens group and a third lens group (2) and (3) having negative power and...
RE33689 Objective lens system for endoscopes  
An objective lens system for endoscopes having favorably corrected distortion. Said lens system comprising a front lens group having negative refractive power and a rear lens group having positive...
5046833 Zoom lens system  
A high performance, compact, light-weight zoom lens system manufacturable at a low cost consisting of a plural number of lens units and so adapted as to perform zooming by varying airspace(s)...
5042911 Method of making lighting lens  
A method of making a lighting lens having a multiplicity of lenticules is disclosed, and in particular a method using spherical and aspherical lenticules is disclosed. The lenticules are of two or...
5042929 Projection lens and projection system  
A projection lens enlarges and projects optical images in a matrix type light valve onto a screen. The projection lens includes a front lens group of the retrofocusing type; a rear lens with...
5035492 Compact and high-speed wide-angle zoom lens system  
A wide angle zoom lens system having a high level of brightness includes a zooming subsystem comprising first and second movable lens units and a fixed third lens unit. The first lens unit has at...
Matches 251 - 300 out of 516 < 1 2 3 4 5 6 7 8 9 10 11 >