Matches 1 - 50 out of 94 1 2 >
Match Document Document Title
7586693 Telephoto lens  
To provide a lens system advantageous for downsizing a moving group and suitable for large aperture ratio formation and ultra telescopic formation while maintaining an excellent optical function...
7426083 Imaging optical system and image capturing apparatus including imaging optical system  
At least one exemplary embodiment is directed to an imaging optical system which includes a first lens unit having a positive refractive power and a second lens unit having a negative refractive...
7418200 Optical unit and imaging device  
A collapsible type optical unit is described that is capable of moving its optical system between a working position and a retracted position as well as an image-pickup apparatus including the...
7411745 Large-aperture-ratio internal focusing telephoto lens  
The purpose is to provide a large-aperture-ratio internal focusing telephoto lens applicable to a wider photographing area by equipping a vibration reduction function capable to satisfactorily...
7394601 Optical system and optical apparatus including the same  
An optical system includes an optical member made of a solid material being a mixture prepared by dispersing inorganic particles in a transparent medium. The transparent medium and the inorganic...
7253973 Image-pickup optical system  
An image-pickup optical system includes, from the object side to the image side, a first lens unit having positive optical power, an aperture stop, and a second lens unit. A diffractive optical...
7253972 Telephoto lens system  
A telephoto lens system of a four-lens-group arrangement includes a negative first lens group, a positive or negative second lens group, a negative third lens group and a positive fourth lens...
7239455 Telephoto lens  
A telephoto lens is provided and has three lens groups as a whole. A first lens group includes a first positive lens having a meniscus shape and having a convex surface on an object side thereof, a...
7230775 Electronic imaging system  
The invention relates to an electronic imaging system wherein an image pickup device is horizontally located while ensuring the space for a reflective member thereby achieving height, length and...
7145735 Image pickup optical system and camera having it  
The present invention discloses an image pickup optical system which has a first lens unit with positive optical power, a second lens unit with negative optical power, a third lens unit with...
6873358 Electronic zoom image input method  
An electronic zoom image input method that enables zooming without declining the resolution by receiving an input image transmitted through a fixed focal distance optical system having a function...
6747814 Wide-angle lens  
The present invention provides a high-performance, thin wide-angle lens suitable for imaging elements with high pixel counts. The wide-angle lens includes, from an object side to an image plane...
6580568 Telephoto lens system  
A telephoto lens system includes a positive first lens group, a negative second lens group and a positive third lens group. Upon focusing, the second lens group moves toward the image, and the...
6563650 Compact, telecentric projection lenses for use with pixelized panels  
Telecentric projection lenses for use with pixelized panels (PP) are provided. The projection lenses have a negative first unit (U 1 ) which has at least one negative meniscus element (N 1 ) having...
6549343 Intermediate telephoto lens system  
An intermediate telephoto lens system includes a first lens group and a second lens group. The first lens group includes a first lens element, a second lens element, a third lens element, an...
6441968 Zoom lens and video camera and electronic still camera using this  
A zoom lens comprising, in the order of an increasing distance from an object; a fixed first lens group ( 1 ) having a positive refractive power; a second lens group ( 2 ) containing an aspherical...
6414800 Variable magnification optical system and camera having the same  
A variable magnification optical system includes, in order from an object side to an image side, a first lens unit of positive refractive power, a second lens unit of negative refractive power...
6392817 Rear focus type zoom lens and optical apparatus using the same  
A rear focus type zoom lens has, in succession from the object side, a first lens unit L 1 of positive refractive power, a second lens unit L 2 of negative refractive power, a third lens unit L 3...
6359738 Two-group zoom lens system and display device having phototaking function  
The invention relates to a zoom lens system of two-group construction, one lens for each group, which is less susceptible to aberration variations even upon zooming and can be much more increased...
6342972 Wide-angle zoom lens system  
A wide-angle zoom lens system having a short optical total length not only at the wide-angle end but also at the telephoto end and a reduced telephoto ratio despite the fact that it has a high zoom...
6317275 Internal focusing telephoto lens  
The internal focusing telephoto lens includes a first lens group I of positive refractive power, a second lens group II of negative refractive power and a third lens group III of positive...
6313955 Rear-focusing telephoto lens system  
A rear-focusing telephoto lens system includes a positive front lens group, and a positive rear lens group, in this order from the object The front lens group includes at least two positive lens...
6313958 Diffractive-refractive photographic optical system  
An optical system includes positive and negative refractive optical elements and positive and negative diffractive optical elements for diffracting light from the positive and negative optical...
6295168 Refractive optical system that converts a laser beam to a collimated flat-top beam  
An optical system having a first positive optical element having an aspherical surface; and a second positive optical element having an aspherical surface. The first and second optical elements are...
6268969 Image forming optical system having diffractive optical element  
An optical system includes, in order from an object side to an image side, a first lens unit having a positive refractive power and a second lens unit having a negative refractive power, the second...
5999326 Achromatic telescope eyepiece without doublets  
A telescope eyepiece comprising a series of single-element lenses in a combination that cancels chromatism. A negative field lens produces chromatism that is partly cancelled by an intermediate...
5914818 Offset projection lens for use with reflective spatial light modulators  
An offset reverse telephoto projection lens that is telecentric in modulator space and has an air equivalent back focal distance of at least 3.3 inches and preferably at least 4.0 inches. The lens...
5831775 Long focal length microlens system  
A long focal length microlens system that controls the variation of the aberration from the infinite object distance to shooting at equal magnification. The long focal length microlens system...
5764425 Telephoto lens  
A telephoto lens includes, in the following order from the object side, a positive cemented lens component composed of a biconvex lens and a biconcave lens and having a meniscus shape as a whole...
5745306 Internal focusing telephoto lens  
The internal focusing telephoto lens of the invention has a focusing group with a small effective diameter and small focusing movement amount and maintains favorable optical performance. The...
5745307 Cluster lens system such as for use in photographic printers  
A cluster lens for imaging a transparency onto an image plane comprises a plurality of lenses which simultaneously have a field of view sufficient to include the transparency. All of the lenses...
5715098 Lens system for a head separated type charge coupled device camera  
Disclosed is a telephoto-type lens system of a head separated charge coupled device (CCD) camera, which includes a first lens group having a positive focal length, a second lens group having a...
5627686 Large-aperture medium-range telephoto lens system  
In a large-aperture medium-range telephoto lens system, which includes, in the following order from the object side, a first lens unit having a positive refractive power, a second lens unit having...
5627685 Telephoto lens system  
The invention provides a telephoto lens system that enables the camera operator to shoot an infinite to nearby object with stably maintained optical quality. This lens system comprises a first...
5610769 Internal focusing telephoto lens system  
An optical system includes, in the following order from the object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, the second lens...
5490014 High-aperture-ratio inner-focus telephoto lens  
A high-aperture-ratio inner-focus telephoto lens comprises a first lens group of positive refracting power, a second lens group of negative refracting power and a third lens group of positive...
5438455 Internal focus telephoto lens for an auto focus camera  
In an internal focus telephoto lens comprised, in succession from the object side, of a first lens unit of positive refractive power, a second lens unit of negative refractive power and a third...
5412507 Great aperture zoom lens  
A great aperture zoom lens has, in succession from the object side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a third lens unit having...
5402268 Telephoto lens system allowing short-distance photographing operation  
A micro lens allowing a short-distance photographing operation from infinity to an equal magnification consists of, in order from the object side, a first lens group including a negative lens and...
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...
5325234 Telephoto lens system  
A telephoto lens system that adopts an inner focusing method and that is capable of satisfactory correction of aberrations while insuring an adequate back focus without increasing the overall lens...
5172274 Large aperture, medium telephoto lens system  
A large aperture, medium telephoto lens system is disclosed which is composed of a front group G F that comprises, in order from the object side, at least two positive lens elements having a...
5121978 Image blur compensating telephotographic lens  
An image blur compensating telephotographic lens has four lens groups. The four lens groups comprise a first lens group having a positive power, a second lens group having a negative power, a third...
5061053 Telephoto zoom lens system  
A telephoto zoom lens system featuring a zoom ratio on the order of 3 which uses an inexpensive optical material having a lens refractive index and which is compact in size can be attained. A first...
5054899 Medium telephoto lens system  
A telephoto lens system which composed of a front group comprising, in order from the object side, a positive first lens having a convex surface of large curvature directed toward the object, a...
5029994 Large-aperture quasi-telephoto lens system  
A large-aperture quasi-telephone lens system having favorably corrected aberrations, especially chromatic aberration, and providing images of high quality comprising, in the order from the object...
4966449 Telephoto lens system  
A telephoto lens system utilizing an inner focusing method, for use in a 35-mm single-lens reflex camera, and despite its lightweight, compact size ensures high performance, and which performs...
4812026 Telephoto lens system  
A bright and very compact telephoto lens system which is capable of effective aberrational compensation at infinity and with minimal aberrational variations when focused at near distances using...
4793698 Telephoto lens system  
A telephoto lens system, both compact and capable of close-in focusing, comprising, in order from the object side, a first lens unit of positive power, a second lens unit of negative power, a third...
4786152 Telephoto lens system  
A compact telephoto lens system with a large aperture whose aberrations are corrected well at any focusing position. This telephoto lens system consists of three lens units, namely a positive, a...
Matches 1 - 50 out of 94 1 2 >