Matches 201 - 250 out of 393 < 1 2 3 4 5 6 7 8 >
Match Document Document Title
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...
6433940 Zoom optical system  
A zoom optical system comprising, in order from the object side, a first lens unit having positive refractive power, a second lens unit having positive refractive power and a third lens unit having...
6429978 Zoom lens and optical apparatus incorporating the same  
A zoom lens disclosed herein, having excellent optical performance within a full zoom range, is appropriate for use as a photographing lens for a lens-shutter camera, a video camera, and a digital...
6411443 Zoom optical system  
An optical system composed, in order from the object side, of a first lens unit which has a positive power or is powerless, a second lens unit which has a positive power, a third lens unit which...
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...
6388818 Zoom lens and optical apparatus having the same  
A zoom lens of the rear-focus type 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, a third...
6384985 Zoom lens system  
A zoom lens system has a first lens unit having a positive optical power, a second lens unit having a negative optical power, a third lens unit, and a fourth lens unit. In this zoom lens system, a...
6377405 Zoom optical system  
An objective optical system has at least three lens units having positive, negative, and positive optical powers. A fourth lens unit can have either negative or positive optical power. The system...
6353504 Objective lens for endoscope  
An objective lens for endoscope comprises, successively from an object side, a first lens group having a negative refracting power, a second lens group having a positive refracting power, a third...
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...
6339508 Photographic optical system  
A photographic optical system comprising a front lens unit which comprises at least a negative lens element and has negative refractive power as a whole, a rear lens unit which comprises at least...
6335833 Afocal zoom lens system for streroscopic microscopes  
An afocal zoom lens system comprising a first positive lens unit, a second negative lens unit, a third positive lens unit and a fourth negative lens unit, wherein the first lens unit and the fourth...
6327099 Zoom lens and optical device having the same  
A zoom lens is enabled to favorably correct aberrations even when a vibration-proofing operation is performed, despite high magnification thereof. This zoom lens includes, in order from an object...
6327096 Set of lens system  
A set of lens systems consisting of a plurality of different kinds of lens systems each comprising a radial type gradient index lens element(s), wherein the radial type gradient index lens elements...
6320702 Afocal zoom lens, and microscope having the lens  
An afocal zoom lens comprising, in order from an object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group...
6320698 Zoom lens with vibration reduction function  
A zoom lens includes in the following order from the object side, a first lens group having a negative refracting power, a second lens group having a positive refracting power, a third lens group...
6317270 Optical system  
A zoom optical system provides a series of lens units designed to allow for zooming with minimal change in aberration resulting from the movement of the lens units. Each lens unit has a plurality...
6297912 Zoom lens having low-pass phase filter, lens system having low-pass phase filter, and camera having the same zoom lens or lens system  
A lens system having a magnification changing function comprises a plurality of lens units, an aperture diaphragm, and a low-pass phase filter. At least one lens unit contributing to the...
6278559 Zoom lens for television camera  
A zoom lens having only five lens groups of positive, negative, negative, positive and positive refractive power, respectively, in order from the object side. The focal distance is varied by...
6266195 Zoom lens  
A simple-structured zoom lens having four lens groups is disclosed wherein the zoom lens does not require refocusing after a zooming operation even when the wavelength of light being imaged is...
6246833 Photographic lens and photographing apparatus having the same  
A photographic lens 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, a third lens unit of...
6236522 Photographic optical system  
A photographic optical system greatly improved in chromatic aberration and capable of providing high image quality with a compact, lightweight and low-cost arrangement having a minimal number of...
6229653 Variable-power eyepiece optical system  
A variable-power eyepiece optical system, which is used in combination with an objective optical system, includes a negative first lens group, a second lens group having a positive first sub lens...
6219190 Zoom lens  
A zoom lens is composed of a plurality of lens units. The plurality of lens units includes a movable lens unit having a negative refractive power lying closest to an image side. The movable lens...
6204976 Zoom lens  
A zoom lens having a maximum of thirteen lens elements in four lens groups, the four lens groups being of negative, positive, positive, and positive refractive power, in order from the object side....
6191895 Zoom lens system  
A zoom lens system has, from the object side, a first lens unit having a optical power, a second lens unit having a negative optical power a third lens unit having a positive optical power, and a...
6175453 Zoom lens  
An improved zoom lens constitutes a plurality of lens groups of different focal length. Through adjusting the position of the lens groups, different zooming ratio may be obtained. Higher image...
6160669 Lens system  
A lens system composed of a first lens unit, a second lens unit having a positive refractive power, a third lens unit having a negative refractive power, and a fourth lens unit having a positive...
6157495 Afocal zoom lens system for stereoscopic microscopes  
An afocal zoom lens system comprising a first positive lens unit, a second negative lens unit, a third positive lens unit and a fourth negative lens unit, wherein the first lens unit and the fourth...
6157494 Zoom lens system using a diffractive optical element and image pickup device using the same  
The invention provides a high-performance zoom lens system which is well corrected for chromatic aberrations by use of a DOE, makes the angle of incidence of a ray bundle on a diffractive surface...
6141157 Zoom lens  
A zoom lens has, in succession from the object side, a first lens unit of positive refractive power fixed during focal length change, a second lens unit of negative refractive power for focal...
6141156 Antivibration zoom lens  
An antivibration zoom lens (10) for photography, video and the like. The zoom lens has an antivibration function and is capable of forming an image of an object over a zooming range from a maximum...
6137638 Projection zoom lens system and projector apparatus  
A projection zoom lens system of the present invention having telecentric incident side is suitable for a projector apparatus using LCD or DMD with prism. The projection zoom lens system of this...
6124982 Zoom lens  
This specification discloses a zoom lens which has, in succession from the object side, a first lens unit of positive refractive power, a second lens unit of negative refractive power for focal...
6115188 Optical system and optical apparatus having the same  
An optical system includes, in order from an object side, a first lens unit of positive refractive power, a second lens unit of negative refractive power, the second lens unit being movable along...
6088169 Wide-angle zoom lens  
A wide-angle zoom lens is disclosed having four lens groups of negative, positive, positive, and positive refractive power, in order from the object side. By satisfying prescribed conditions, the...
6084721 Zoom lens  
A zoom lens has, in succession from the object side, a first lens unit fixed during a focal length change and having positive refractive power, a second lens unit moved along the optical axis...
6084720 Small-sized real image mode zoom finder  
A real image mode zoom finder includes, in order from the object side, an objective optical system with positive refracting power having a first lens unit with negative refracting power, a second...
6084722 Zoom lens of rear focus type and image pickup apparatus  
A zoom lens of the rear focus type having an increased range with the back focal length long enough to accommodate a color separation prism, includes, in order from an object side to an image side,...
6075653 Projecting zoom lens system and projector apparatus  
A projecting zoom lens system whose incidence side is telecentric of this invention is formed by the first to fourth lens groups arranged sequentially from the screen side and having negative,...
6052235 Telephoto zoom lens  
A telephoto zoom lens includes a first positive lens group, a second negative lens group, a third positive lens group and a fourth lens group. A resultant refractive power of the third and fourth...
6038081 Zoom lens having plastic lens in first lens group  
A zoom lens having a plurality of lens groups, includes: a first lens group including a plurality of lenses, provided closest to an object side, wherein a first lens made of a plastic lens having a...
6035145 Real-image variable magnification view finder  
A real-image variable magnification finder includes an objective optical system of positive power, a condenser lens located at an image forming surface of the objective optical system, an eyepiece...
6025960 Zoom optical system  
The invention provides a compact zoom optical system which can be reduced in terms of the lens length upon collapsing, albeit having a zoom ratio as 3 or greater. The zoom optical system comprises...
6011656 Wide-angle projection zoom lens  
A wide-angle zoom lens includes four sets of lenses. The first set of lenses has a negative effective focal length. The second set of lenses has a positive effective focal length for changing the...
6011648 Optical system having an optical element made of resin  
An optical system includes a first optical element formed of a noncrystalline polyester resin having a copolymer ratio of 9,9-bis [4(2-hydroxyethoxy) phenyl]fluorene in a range of 35 molar percent...
6002527 Compact high-zoom-ratio zoom lens  
A compact, high-zoom-ratio, high-performance five-group zoom lens having a positive-negative-negative-positive-positive refractive power arrangement. The zoom lens has the ability to focus at close...
5991093 Soft-focus zoom lens system  
A soft-focus zoom lens system comprises a negative front lens group and a positive rear lens group, both of which are arranged to perform a zooming operation by moving the first lens group and the...
5986820 Zoom lens of the inner focus type  
A zoom lens is disclosed comprising, from front to rear a first lens unit of positive refractive power, a second lens unit of negative refractive power for varying the focal length, a third lens...
5978150 Zoom lens  
A high performance zoom lens with a high zoom ratio is suitable for a wide range of uses. The zoom lens includes, in order from the object side, a first lens group having a positive refractive...
Matches 201 - 250 out of 393 < 1 2 3 4 5 6 7 8 >