Matches 151 - 200 out of 272 < 1 2 3 4 5 6 >
Match Document Document Title
5508848 Wide-angle lens for film-combined type cameras  
The present invention provides a wide-angle lens for film-combined type cameras, comprising a first lens element having a negative refractive power and a second lens element having a positive...
5504628 Passive athermalization of optics  
A doublet lens is optically passively athermalized by choosing two lens materials that have approximately the same Abbe number and substantially different thermal coefficients of refractive index....
5502597 Wide-angle photographic lens system and a photographic camera  
A lens system 10 suitable for use in imaging on film F in panoramic cameras 100. The lens system 10 comprising an aperture stop ST, a front lens unit 20 located behind the aperture stop ST, the...
5500770 Macrolens system for emission microscopy  
A multiple lens element macrolens system operative as a single lens has a high light transmission value and a wide field of view of an object to be viewed. The macrolens system provides a long...
5491587 Collimating lens for optical system using semiconductor laser  
A collimating lens system comprises a chromatic aberration correction element and a converging lens which has both surfaces formed of a convex aspherical surface. The converging lens has no...
5479296 Optical system of optical information recording/reproducing apparatus  
An optical system of an optical information recording/reproducing apparatus including a light source for emitting a generally parallel luminous flux; an objective optical system for converging the...
5475536 Lens system for reading image  
A lens system used for reading an image, the system being constructed of two lenses and presents sufficient performance for reading an image in an image scanner, a facsimile, etc. The system is...
5467225 Objective lens for an optical disk drive  
An optical lens for an optical disk drive suppresses a chromatic aberration to a sufficiently small level and attain a numerical aperture of as large as 0.55. It comprises a biconvex positive lens...
5388006 Telephoto camera lens  
The telephoto lens is in each case put together from two different lens systems, a front group and a focusing group. The object-side front groups have fixedly arranged lens elements or lens element...
5381264 Multiple field of view sensor lens assembly  
A multiple field of view sensor lens assembly suitable for inclusion in an infrared imaging system. The lens assembly includes a rotatable telescope 10 for providing first and second fields of view...
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...
5327291 Compact objective lens  
A lens system for a folding reflex camera is provided. The system includes: (a) a first group on the object side of the system's stop which (i) has a positive dioptric power, (ii) includes an...
5327283 Endoscope optical system  
The endoscope optical system has an objective with an object-side negative lens cluster, the constructional design of which should minimise or exclude image scale defects, such as distortion and...
5321550 Optical system of optical information recording/reproducing apparatus  
An optical system of an optical information recording/reproducing apparatus including a light source for emitting a generally parallel luminous flux; an objective optical system for converging the...
5311363 Fixed-focal-length lens system  
A fixed-focal-length lens system includes first and second lens groups arranged in order from front to rear. The first lens group consists of a plurality of lenses and has a negative refracting...
5303088 Retrofocus type lens  
A retrofocus type lens includes, in order from the screen side, a first lens unit having a negative refractive power and a second lens unit having a positive refractive power with a longest air...
5282087 Multiple field of view sensor lens assembly  
A multiple field of view sensor lens assembly suitable for inclusion in an infrared imaging system. The lens assembly includes a rotatable telescope 10 for providing first and second fields of view...
5233474 Wide-angle lens system  
A retro-focus wide-angle lens system having, in order from the object side, a negative power front group and a positive power rear group having a diaphragm stop. The front group comprises a...
5210646 Color-corrected optical systems and method of selecting optical materials therefor  
A method is described for selecting optical materials to use in designing color-corrected optical systems. Various dioptric, catadioptric and anamorphic optical systems are described, which use...
5200850 Anamorphic optical system  
An anamorphic optical system is provided with an imaging lens group comprising one or more plastic lenses and a single plastic correcting lens disposed on the image plane said of the imaging lens....
5198926 Optics for medical laser  
An optical system for use in a medical laser apparatus comprising an achromat having optical elements selected to cause two substantially different wavelengths, one visible and one infrared, to...
RE34156 Scanning optical system for use in a laser beam printer  
An optical system particularly for a laser beam printer comprising a semiconductor laser, a collimating lens, a cylindrical lens having curvature in the sub-scanning cross section, a deflector and...
5175652 Imaging optical system  
An imaging optical system has a first objective lens movable along the optical axis thereof for focus adjustment and for forming the image of an object at infinity, and a second objective lens for...
5142410 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...
5136418 fθ lens system in optical scanner  
In an fθ lens system in an optical scanner, an approximately parallel light beam from a light source device is formed as a linear image extending in a main scan-corresponding direction and is...
5097359 Endoscope relay lens configuration  
Relay lenses for endoscopy include an axially symmetrical three-part optical component having a thin symmetrical negative element interposed between identical, substantially spherical outside...
5020893 Biconvex rod lens  
A biconvex rod lens for the optics assembly of a medical or technical endoscope comprises of a light transmitting rod and a correcting lens cemented to one end of the rod. The rod is provided with...
5002372 Optical system for amphibious camera and a moving device using the same  
An optical system housed within a waterproof package includes, from front to rear, front lens and a rear group of lenses. For both of the front and rear surfaces of the front lens, proper numerical...
5000552 Optical system for use in photographic devices  
An optical system comprising two plastic elements is suitable for use in very low cost, wideangle cameras having curved image surfaces. This system has low distortion across a curved field angle of...
4995710 Objective lens for optical disk  
An objective lens for an optical disk has a first lens group constructed by joining a negative meniscus lens, a biconvex lens, and a negative meniscus lens sequentially arranged from the side of a...
4961625 Automobile head-up display system with reflective aspheric surface  
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...
4953926 Scanning optical system for use in a laser beam printer  
An optical scanning system for use in a laser beam printer is disclosed which comprises a cylindrical lens for imaging laser light in an auxiliary scanning cross section at a point in front of a...
4881801 Fast, aberration-free flat field catadioptric telescope  
This invention relates to Catadioptric Telescopes having concave spherical mirror reflectors as the primary objective and a refractive correction element for reducing the spherical aberration of...
4789230 f-θ Lens for use in a light beam scanning device  
An fθ lens for use in a light beam scanning device is constituted by a meniscus lens having a small power and located on the side of a deflection point, and a planoconvex lens having a large power...
4772107 Wide angle lens with improved flat field characteristics  
There is disclosed an improvement in wide angle lenses wherein very flat field characteristics are achieved. This is accomplished by a novel two element field flattener just before the image plane....
4770517 Two-lens fθ lens  
This invention relates to an fθ lens for scanning a laser beam whose deflection half-angle reaches 30°. If a deflection angle increases, the curvature of field and fθ characteristic are rapidly...
4768866 Optical magnifying system: 4× loupe  
A four element optical magnifying system (10) is disclosed. The primary lens (12), secondary lens (14), tertiary lens (16), and quaternary lens (18) form an optical system (10) have surfaces shaped...
4718753 Telescope with correcting lens  
The present invention provides in one embodiment a Newtonian type reflecting telescope, preferably using a primary parabolic reflecting mirror, in which a meniscus lens is used to simultaneously...
4707085 Fθ lens for use in light beam scanner  
An fθ lens for use in a light beam scanner for deflecting a monochromatic or quasi-monochromatic light beam. The fθ lens comprises two positive-meniscus lenses having concave surfaces directed to...
4702569 Color-corrected Petzval lens systems  
A method is described for selecting optical materials to use in designing color-corrected optical systems. Various dioptric, catadioptric and anamorphic optical systems are described, which use...
4623224 Anastigmatic eyepiece  
The invention is an eyepiece which is corrected for spherical aberration, coma, astigmatism, curvature of field, and longitudinal and lateral chromatic aberrations. The invention comprises a...
4575195 Flat field lenses  
A flat field lens system wherein the Petzval sum is corrected without requiring many spaced high powered elements or sharply bent elements. This is achieved by having the Petzval sum correction...
4482217 Plossl type eyepiece for use in astronomical instruments  
A Plossl type eyepiece for astronomical instruments in which the external flint elements of the symmetrical achromatic doublets are double concave elements.
4264151 Optical adaptor for movie and television cameras  
An optical adaptor is provided to permit objective lenses designated for a certain image format to be used on optical devices having a smaller image format. Thus, 35 mm single lens reflex camera...
4222634 Wide angle objective for examination of the eye  
A wide angle objective intended especially for visual and photographic examination of the fundus of the eye. Each of the separate lens elements which together make up the objective is so designed...
4155626 Spectacles with a wide angle of vision and method  
Wide angle spectacles comprising a spectacle frame and a wide angle lens system attached to the frame. The wide angle lens system includes at least first and second lenses. The lenses are arranged...
4094585 Loupe  
A magnifier or loupe of high magnifying power comprising a positive singlet followed by a cemented doublet in the overall form of a meniscus having bi-convex and bi-concave elements. The cemented...
4002406 Microscope condenser  
A microscope condenser of the Abbe type has the optical characteristics of the biconvex singlet followed by the convex-plano singlet improved by making the first surface of the biconvex singlet...
3870401 INVERTED TELEPHOTO-TYPE LENS  
The lens has far and near conjugate foci and comprises a negative forward lens element group disposed at that end of the lens of the present disclosure which faces said far conjugate focus and a...
3637295 ACHROMATIC LENS SYSTEM  
An achromatic lens system comprising a lens system which includes at least one lens whose refractive index changes substantially proportional to the square of the distance from a central axis of...
Matches 151 - 200 out of 272 < 1 2 3 4 5 6 >