Matches 351 - 400 out of 466 < 1 2 3 4 5 6 7 8 9 10 >
Match Document Document Title
5638210 Zoom lens having a vibration correcting optical system  
A zoom lens has an optical axis and at least three lens groups arranged in tandem and capable of being disposed in front of an object. The second lens group counted from the side of the object...
5610767 Zoom lens system with small numbers of lenses and wide viewing angle  
A zoom lens system comprising, in order from the object side, a positive first lens group and a negative second lens group, with the focal length being changed by varying the distance between the...
5600489 Copying zoom lens system  
A copying zoom lens system is provided with from the original side a first lens unit of negative refractive power including at least one negative lens element, a second lens unit of positive...
5592334 Zoom lens system  
A zoom lens system which enables favorable image quality to be obtained even when it is focused on an object at a short distance. The zoom lens system has a 1-st lens unit (G1) of positive power, 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...
5574599 Zoom lens and zooming method  
A zoom lens comprising, from front to rear, a first lens unit of negative refractive power, a second lens unit of positive refractive power and a third lens unit of negative refractive power,...
5570234 Compact wide-angle variable focal length lens system  
A wide-angle variable focal length lens system comprising a first lens unit which is to be kept stationary for varying a focal length of the variable focal lens system and composed of a single...
5568322 Image forming lens system  
An image forming lens system is provided which has at least three lens groups, wherein diameters of outer most circumferences of all of the lens groups are identical, and wherein positions of at...
5566026 Zoom lens  
A compact zoom lens system having a zoom ratio of an approximately 3.5 times comprising a first lens group having a positive refractive power, a second lens group having a positive refractive power...
5559635 Zoom lens system capable of correcting image position  
A zoom lens system comprises, in the following order from the object side, a first lens group with a negative refractive power and a second lens group with a positive refractive power. When...
5550679 Projection lens apparatus having a plurality of lens groups to perform zooming  
A projection lens apparatus has, in order from the side of a first conjugate point of a longer distance to the side of a second conjugate point of a shorter distance, a first lens group having a...
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...
5521758 Variable-magnification optical system capable of image stabilization  
A variable magnification optical system comprises, from front to rear, a lens unit which is stationary during variation of the magnification and during focusing and a portion for varying the...
5519538 Zoom lens for preventing image from being blurred  
A zoom lens including at least two lens groups which move relative to one another in an optical axis direction to change the focal length of the zoom lens, wherein during the zooming operation in...
5504626 Wide-angle zoom lens system having a high vari-focal ratio  
A wide-angle zoom lens system having a high vari-focal ratio comprising, in order from the object side, a first lens unit having a negative refractive power, a second lens unit having a negative...
5500703 Real image zoom viewfinder  
A real image zoom finder has a zoom portion with one or more moving elements to vary the magnification of the finder. A field lens is substantially separated from suitable erecting optics to...
5490012 Underwater wide angle zoom lens  
A zoom lens has, in succession from the object side, a first lens unit G1 having an object side surface for contact with water and having a meniscus shape having its convex surface facing the...
5485313 Zoom lens systems  
Zoom lens systems for use with moderately large image formats, such as those found in instant photography cameras, are provided. The systems include three lens units arranged in a...
5481405 Stepless micrographic zoom lens having large magnification ratio  
A stepless zoom lens useful in micrographic applications providing stepless magnfications from 6.8x to 32x, a zoom ratio exceeding 4.7 to 1. Fourteen elements are arranged in three groups. An...
5461512 Zoom camera lens having three moving groups  
A zoom camera lens which is particularly compact, has a small number of elements and is capable of good performance at relatively wide aperture has a front negative lens group, a middle positive...
5446592 Compact zoom lens system  
A compact zoom lens system comprises a front negative lens component and a rear positive lens component with a variable air space between the front and the rear lens components. The front negative...
5442484 Retro-focus type lens and projection-type display apparatus  
A retro-focus-type lens is provided from a large conjugate side with a first lens group having a negative refracting power, a second lens group having a positive refracting power which is spaced...
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...
5434711 Zoom lens system  
The improved zoom lens system comprises, in order from the object side, a positive first lens group, a positive second lens group and a negative third lens group, the second lens group consisting...
5424870 Compact zoom lens system  
A compact zoom lens system comprises, from the object side, a first lens component of a positive refractive power, a second lens component of a positive refractive power, and a third lens component...
5418648 Varifocal lens system  
A varifocal lens system consists of first and second lens groups arranged in this order from the image forming side. The first lens group consists of four lenses and has a negative refracting power...
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...
5386320 Wide angle zoom lens system  
A zoom lens system comprising, in order from the object side, a first lens unit having a negative refractive power as a whole, a second lens unit having a negative refractive power as a whole and a...
5379154 High variable power ratio zoom lens  
In a zoom lens having, in succession 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...
5363243 Zoom lens system  
An improved zoom lens system is disclosed which includes at least three lens groups which are arranged, in order from the object side, as a first lens group having a positive focal length, a second...
5361167 Vari-focal lens system  
A compact vari-focal lens system comprising, in the order from the object side, a first lens unit having a positive refractive power, a second lens unit having a positive refractive power and a...
5353160 Three-unit compact zoom lens system  
The present invention provides a three-unit zoom lens system comprising, in order from the object side, a first lens unit G1 consisting of a negative meniscus lens convex on the object side and a...
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...
5345338 Zoom lens system for use in a copying apparatus  
A zoom lens system for use in a copying apparatus has first, second and third lens units of negative, positive and negative, respectively. Zooming is performed while the conjugate distance is kept...
5331462 Zoom lens having a long back focal length  
In a retro-focus type lens divided into three lens units by the widest air spacing and the next widest air spacing, a first lens unit is disposed on a long conjugate side and has negative...
5329400 Focal length changeable lens  
A focal length changeable lens system for use with an on-chip micro-lens equipped solid-state imaging device, whose exit pupil is located at a long distance and whose focal length is changeable...
5327290 Compact size zoom lens system  
A new compact-size, light-weight and low-cost zoom lens system having a high optical quality with a very simple structure including, from the object side to the image side, a front lens group...
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...
5325235 Compact zoom lens system  
The present invention relates to a compact zoom lens system having a long back focus and a zoom ratio of about 1.7, which comprises a first lens unit G1 having a positive focal length, a second...
5305148 Compact varifocal lens  
A varifocal lens is disclosed, comprising, from front to rear, a first lens unit of negative power, a second lens unit of positive power, and a third lens unit of negative power, all these lenses...
5289317 Compact zoom lens  
A zoom lens comprising, from front to rear, a first lens group of negative power, a second lens group of positive power and a third lens group of negative power, wherein as zooming from the...
5278698 Magnifying projecting lens  
A magnifying projecting lens has a negative first lens group, a positive second lens group and a positive third lens group that is arranged in this order from a magnifying side. The lens groups are...
5270866 Compact zoom lens  
A zoom lens comprising, from front to rear, a first lens unit of negative power, a second lens unit of positive power and a third lens unit of negative power, the second and third lens units being...
5270864 Zoom lens system for use in copying apparatus  
A zoom lens system includes from one side to the other side: a first lens unit of a negative power having a negative lens element concave to the one side; a second lens unit of a positive power...
5267084 Compact, fast zoom lens system  
The present invention provides a zoom lens system comprising, in order from the object side, a first lens unit G1 having a positive refracting power; a second lens unit G2 including a front subunit...
5267083 Lens system for optical reader  
First to third lenses are arranged in order to have a common optical axis. The first and second lenses provide a combined lens structure for shifting an object point along the common optical axis...
5245475 Imaging optical system for endoscopes  
An imaging optical system for endoscopes used for re-imaging an image formed by endoscopes, comprising in the order from the object side a first lens unit which has a positive refractive power and...
5220458 Keplerian zoomfinder optical system  
A Keplerian zoom finder system has sequentially from its object side an objective lens with positive refractive power, a field lens with positive refractive power arranged in the vicinity of the...
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...
5204780 Lens system for a copying machine  
A three group, three component lens system comprising, in order from one side a first, positive meniscus lens defining a convex surface directed to an object, a second, biconcave lens, and a third,...
Matches 351 - 400 out of 466 < 1 2 3 4 5 6 7 8 9 10 >