Matches 401 - 450 out of 466 < 1 2 3 4 5 6 7 8 9 10 >
Match Document Document Title
5187509 Illumination system for use in image projection apparatus  
An illumination system for use in an image projection apparatus, having a light source assembly which includes a lamp and a concave reflector for producing convergent light, and an illumination...
5182673 Zoom lens having high variable magnification  
In a zoom lens having a high variable magnification, first and second lens groups and respectively having negative and positive focal lengths are sequentially arranged from an object side of the...
5166828 Zoom lens system  
A zoom lens system has (in order from the object side of the lens system) a first lens unit with a positive refractive power, a second lens unit with a positive refractive power, and a third lens...
5159493 Retrofocus type wide angle lens comprising a fixed group and movable corrective and rear groups  
Described herein is a retrofocus type wide angle lens system composed of a front group with a negative power and a rear group with a positive power, in which the front group is divided into a fixed...
5157552 Zoom lens system for a limited conjugate distance  
A zoom lens system for a limited conjugate distance comprises at least three lens units which can be divided into, from an object side to an image side, a front lens group having a positive...
5153776 Wide angle zoom lens system  
The present invention provides a zoom lens system designed to be used with cameras which are limitless in terms of their back focal distances, like "lens shutter cameras" and, more particularly, a...
5148308 Real image type vari-focal viewfinder  
A real image type vari-focal viewfinder comprising an objective lens system consisting of a plurality of lens components and functioning to form a real image, and an eyepiece lens system, adapted...
5148321 Compact zoom lens system  
A compact zoom lens system comprising, in the order from the object side, a first lens unit having a positive refractive power, an aperture stop, a second lens unit having a positive refractive...
5144489 Compact wide-angle zoom lens  
A compact wide angle zoom lens has a view angle as wide as 65°-72° and a magnification varied by changing an inter-group spacing. The zoom lens comprises a first lens group having a positive...
5138493 Zoom lens system  
A zoom lens system including, from an enlargement side, a first lens unit of a positive power, a second lens unit of a positive power and a third lens unit of a negative power. The first and third...
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...
5062695 Zoom lens system for use in a microfilm projection apparatus  
A zoom lens system comprising, in order from an enlargement side, a first lens unit of a negative power, a second lens unit of a positive power and a third lens unit of a negative power. The first...
5042926 Zoom lens and focusing method  
A zoom lens comprises first to third lens groups sequentially arranged from an object side toward an image side and respectively having negative, positive and negative focal distances; a first zoom...
5039211 Zoom lens capable of image blur compensation  
A zoom lens has three or more lens groups. A variable power lens group or at least one lens group located in a position nearer to an image than a variable power lens group serves as an image blur...
5033832 High zoom-ratio lens system for covering wide angle for compact camera  
A high zoom-ratio lens system covering wide angle for compact camera comprising a first lens group having a positive focal length, a second lens group having a positive focal length, and a third...
5015077 Zoom lens system for use in a microfilm projection apparatus  
A zoom lens system comprising, in order from an enlargement side, a first lens group of a negative power, a second lens group of a positive power and a third lens group of a positive power. The...
5009491 Compact zoom lens system  
A compact zoom lens system comprising from the object side to the image side, a first lens unit of a negative refractive power having a cemented lens component consisting of a negative lens element...
5002373 Zoom lens system of inner focus type  
A zoom lens system of inner focus type including a first lens group having positive refractive power, a second lens group having positive refractive power and a third lens group having negative...
4983027 Compact zoom lens system with a high zoom ratio  
A compact zoom lens system with a high zoom ratio is provided which comprises from the object side to the image side, a first lens unit of a positive refractive power, a second lens unit of a...
4955700 Small-size zoom lens system  
A small-size zoom lens system includes a first lens group, a second lens group, and a third lens group which are successively arranged from an object side to an image side. The first, second, and...
4867545 Telecentric image-forming system having varible magnifications  
The image-forming magnification of a telecentric optical system, for use in an exposure apparatus such as a projecting apparatus, a laser plotter and the like is determined by the focal length...
4854683 Zoom lens  
A zoom lens includes, in order from an object, a first lens unit having positive refracting power, a second lens unit having negative refracting power, and a third lens unit having positive...
4854682 Compact high vari-focal ratio zoom lens system  
A compact high vari-focal lens system permitting simplifying the lens barrel structure and having favorable performance; comprising a first lens group having positive refractive power, a second...
4854680 Zoom view finder  
A zoom view finder comprising a plural number of lens units and so adapted as to perform zooming by displacing some of said lens units, said zoom view finder satisfying the following conditions:...
4840467 Compact zoom lens system with a high zooming ratio  
A compact zoom lens system with a high zooming ratio comprises, in order from the object side, a first lens group having a positive refracting power, a second lens group having a positive...
4838668 Zoom lens  
A zoom taking lens for a photographic single lens reflex (SLR) camera. The lens has an air space between elements of the lens, which air space is large enough to accommodate reflective means for...
4838666 Wide angle zoom lens of long back focal distance  
A wide angle zoom lens of increased back focal distance 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 positive...
4828372 Wide-angle zoom lens  
A compact wide-angle zoom lens with short back focus comprises a forwardmost negative power lens unit movable for focusing and compensation during zooming, followed by a positive power variator...
4824223 Projection objective with variable focal length  
A projection objective with variable focal length is provided, consisting of a front member (F) with negative refractive power and a multiple-lens basic objective (G) with positive refractive...
4812023 Zoom finder  
A zoom finder comprising a system for forming the image of a measuring field frame and a vari-focal system in the order from the object side and arranged that the apparent size of the measuring...
4810072 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, the first and second lens units being axially movable...
4779964 Zoom lens with a mechanism for moving a first lens so as to be compactly housed  
A zoom lens has at least a first group lens and a second group lens which are spaced a greater distance from each other in one of telephoto setting and wide angle setting than the other setting,...
4773744 Compact zoom lens system with a high zooming ratio  
A compact zoom lens system with a high zooming ratio comprises a first lens group having a positive refracting power, a second lens group having a positive refracting power and a third lens group...
4757336 View finder of variable magnification  
A view finder having, 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 lens unit being moved axially...
4735493 Wipe-angle zoom lens system  
A wide-angle zoom lens system comprises, in order from the object side, a first lens group having a negative refractive power, a lens unit having a positive refractive power and a second lens group...
4733952 Small zoom lens  
A zoom lens including a wide angle and having a zoom ratio of approximately two, in which a two-group zoom composed of a negative front group and a positive rear group is increased in a refracting...
4726665 Compact wide-angle zoom lens  
A compact wide-angle zoom lens comprising, in order from the object side, a variator that consists of a first lens component having a negative focal length and a second lens component having a...
4726668 Zoom lens of short total length  
In the disclosed zoom lens, a positive front lens unit and a negative rear lens unit are moved forwardly axially in differential relation to vary the overall focal length from a minimum to a...
4721371 Variable focal length lens system  
A variable focal length lens system comprising a first lens unit having positive refractive power, a second lens unit comprising a negative lens, and a third lens unit comprising a positive lens...
4705363 Aberrational deterioration prevented zoom lens  
An aberrational deterioration preventing zoom lens comprising a lens group axially movable for zooming, another lens group axially movable for zooming which has a plurality of lens units, an...
4684223 Zoom lens of the rear focusing type  
In the disclosed zoom lens of the rear focusing type, three lens groups are axially moved for zooming from the wide angle to the telephoto settings or vice versa. A focusing action is imparted into...
4647160 Small-sized wide angle zoom objective  
A small-sized wide angle zoom objective comprising, from front to rear, a 1st lens unit of negative power, a 2nd lens unit of positive power and a 3rd lens unit, wherein the 1st and 2nd units are...
4571031 Wide angle zoom objective  
A wide angle zoom objective has three lens units of which the first counting from front is of negative power, the second is of positive power and the third is of negative power. At least one lens...
4509833 High variable magnification wide angle zoom lens  
A wide angle zoom lens with an increased varifocal range comprises, from front to rear, a divergent 1st lens group, a convergent 2nd lens group and a divergent 3rd lens group, the aforesaid three...
4411488 Afocal zoom refractor telescopes  
An afocal zoom refractor telescope 20 is formed by a variable magnification achromatic objective system 18 and a fixed focus eyepiece system 19 aligned on a common optical axis 17 and arranged to...
4303311 Short distance zoom lens system  
A short distance zoom lens system for forming an image of an object lying at any short distance at a predetermined short distance comprises, in order from the object side, a first group which is a...
4198127 Wide angle zoom lens system having small distortion  
The present invention provides a compact zoom lens which exhibits small distortion aberration. The lens system comprises, in order from the object side, a front lens group having a negative focal...
4196969 Zoom lens having a small distortion aberration  
The present invention provides a compact zoom lens which exhibits only small distortion aberration. The present invention comprises, in order from the object side, a first lens group having a...
4170402 Very compact wide-angle zoom lens system  
A very compact wide-angle zoom lens system with favorably corrected aberrations comprising a first lens group consisting of a negative meniscus lens element and a lens component having negative...
4018510 Varifocal objective containing movable lens component of positive refractivity  
An objective of variable focal length affording an aperture ratio of about 1:1.0 to 1:1.4 for narrow film projectors and microscopes comprising at least six lens members separated by air spaces,...
Matches 401 - 450 out of 466 < 1 2 3 4 5 6 7 8 9 10 >