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JP2000322757A |
To sufficiently reduce the diameter of a light beam to be converged on each information recording layer by designing to minimize the spherical aberration of the light beam that converges on the information recording layer positioned near...
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JP3103166B2 |
A macro lens comprises first to third lens groups having positive powers and an aperture stop disposed the first and second lens groups. The first lens group, aperture stop and second lens group remain fixed with respect to one another a...
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JP2000292688A |
To provide an image pickup device having a photographing lens having the short lens total length and maintaining optical performance of the whole image screen in a well-balanced state by adopting a triplet type, arranging a diaphragm in ...
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JP2000284172A |
To obtain a color image read lens with high resolution which while correcting the on-axis chromatic aberration effective and sufficiently, can main tain the excellency of other various aberrations by making a lens of five-group constitut...
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JP2000275729A |
To obtain a projection lens which is formed so that the outside diameter of a 2nd lens group is made small and interference with illumination luminous flux is extremely reduced while making an optical system compact, whose resolution is ...
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JP2000275510A |
To make the telephoto/wide-angle power variation ratio large even in a shutter-diameter reduced state while making the lens compact and low-cost by making the focal lengths of lenses on a wide-angle side and a telephoto side meet specifi...
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JP2000275006A |
To obtain a good wavefront aberration at a parallel wavefront to a point of an infinite object and a good image formation efficiency aberration to a finite object by specifying a shape of each of three lenses of a group and constituting ...
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JP2000266997A |
To provide a photographing lens of two-group two sheet constitution excellent in production aptitude, having high brightness of an image plane, and having restrained fluctuation in various kinds of aberrations. This photographing lens 30...
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JP2000266996A |
To enlarge the numeral aperture without increasing aberration and attain miniaturization by combining a specific refraction factor distribution lens with a single homogeneous plano-convex lens. A single refraction factor distribution len...
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JP2000258684A |
To shorten the focal distance of an image pickup lens, also to secure the back focus distance thereof and to easily produce the lens. This lens is constituted of a 1st lens 1 consisting of a concave lens whose mark for the center radius ...
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JP2000249912A |
To lighten the load of a focusing action and to reduce the deterioration of resolution caused by the fluctuation of an original by making the curvature of the field small and making depth large as an image forming lens constituted of fiv...
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JP2000249916A |
To lighten the load on a focusing action and to reduce the deterioration of resolution caused by the fluctuation of an original by making the curvature of the field small and making depth large as an image forming lens constituted of fou...
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JP3085787B2 |
PURPOSE:To obtain the shutter system of an electronic camera by which a time required until an appropriate exposure value is obtained can be shortened compared with a conventional circuit which operates an exposure control by an electron...
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JP3079497B2 |
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JP3077811B2 |
A photographic lens system comprising, in the order from the object side, a first lens component which is designed as a cemented doublet consisting of a positive lens element and a negative lens element in this order, a second lens compo...
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JP2000227547A |
To provide a photographic lens of a 2 groups 2 lenses construction where illuminance of the image surface is bright and variation in various aberrations can be kept down without narrowing the angle of the photographic image. In this phot...
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JP3076098B2 |
PURPOSE: To constitute a large-aperture wide angle lens of a minimum number of lenses having as small diameters as possible by constituting the lens of a diverging action group, an air gap, an aperture stop, and a converging action group...
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JP3073786B2 |
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JP3072533B2 |
A zoom lens system comprising at least a first lens unit having a positive refractive power as a whole, a second lens unit having a negative refractive power as a whole and a third lens unit having a positive refractive power as a whole,...
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JP2000509514A |
Projection lens systems (13) for use in projection televisions are provided. The systems are characterized by a screen side lens unit (U1) which: (1) has a weak optical power; (2) has a negative, aspherical lens element composed of a hig...
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JP2000509515A |
PCT No. PCT/US97/07686 Sec. 371 Date Oct. 27, 1998 Sec. 102(e) Date Oct. 27, 1998 PCT Filed Apr. 28, 1997 PCT Pub. No. WO97/41461 PCT Pub. Date Nov. 6, 1997A projection lens for use with a pixelized panel (LCD) is provided. The lens has ...
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JP3069437B2 |
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 power and the second lens group consists of...
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JP2000193884A |
To provide a compact photographing lens system having a good optical performance by providing in order from the object side a negative first lens, a both side projecting second lens, a diaphragm, a positive third lens, a negative fourth ...
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JP2000193894A |
To provide an illuminating optical system for an endoscope, capable of leading luminous light extending over the wide range of the visual field in a small size by constituting at least one or more faces except the nearest face on the obj...
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JP3060327B2 |
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JP2000180719A |
To provide an extremely compact photographic lens system having high optical performance.This system is provided with a front group F, a diaphragm A and a positive rear group R, and the rear group R is constituted of three lenses, a nega...
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JP2000180721A |
To obtain an image pickup lens which is satisfactory in image formation performance and reduced in cost with simple constitution.This image pickup lens L is a biconvex single lens having a diaphragm S on an image I side, and either of a ...
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JP2000171697A |
To obtain a photographing lens capable of restraining aberration fluctuation at the time of focusing to be small and obtaining excellent image quality in a wide photographing distance range from long-distance photographing to short-dista...
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JP2000171701A |
To obtain a high-performance deformable gauss type lens suitable as a comparatively telephoto lens mounted on a camera for monitoring and satisfying a condition that an f-value is about 1.8 and the ratio of a focal distance to image size...
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JP3049524B2 |
PURPOSE: To provide an objective optical system for oblique endoscope, easy to fabricate, and an assembly of the endoscope tip which holds this objective optical system by locating the optical axis of one group of lenses in eccentricity ...
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JP3045634B2 |
PURPOSE: To provide a photographic lens having a bright F-value, a wide angle and a short full length and excellently corrected in various kinds of aberrations. CONSTITUTION: In the photographic lens, a positive first lens L1 whose conve...
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JP2000147374A |
To obtain a high numerical aperture objective lens whose numerical aperture is large and which is provided with excellent performance though it can be comparatively easily manufactured and it is inexpensive by providing a first and a sec...
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JP3044588B2 |
PURPOSE: To provide an objective lens in which influence of a long beam of light, unnecessary for observation, upon the picture image is removed by configuring the objective lens with an image forming system and a relay lens system. CONS...
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JP3041939B2 |
This invention relates to a projection lens system used for transferring circuit or other patterns from masks, etc. on which the circuit patterns are drawn onto semiconductor wafers by projection photolithography, and provides a projecti...
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JP3040187B2 |
A projection lens consists of a first lens group including a positive lens, a second lens group including a meniscus type lens having a comparatively low refractive power, a third lens group including a bonded negative lens, a fourth len...
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JP3038974B2 |
PURPOSE:To obtain the low-cost, compact symmetrical wide-angle lens by specifying conditions regarding the compacting of lenses, the compensation of the off-axis aberrations, the composite air gap, the overall thickness of the lenses, an...
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JP3037967B2 |
PURPOSE:To obtain the imaging performance which is high up to a periphery by constituting the above lens of 1st to 5th lens groups, constituting the 1st lens group of the combined lens of a negative lens and a positive lens and satisfyin...
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JP2000111802A |
To provide an observation optical system and an observation device using the same capable of observing an excellent object image by correcting image blur caused by hand shake in binoculars and a telescope.In this observation optical syst...
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JP3032896B2 |
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JP3032909B2 |
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JP2000105334A |
To improve chromatic difference of magnification and other aberration even in the case of applying a lens to a CCD image pickup element whose number of pixels is large while securing compact constitution such as five lenses by setting sp...
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JP2000098224A |
To obtain a lens having the angle of view of about 50° with simple constitution and having complete optical performance in practical use as a camera to be used for monitoring by constituting the lens so that a surface nearest to an imag...
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JP3027863B2 |
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JP2000089107A |
To obtain an image reading lens capable of satisfactorily correcting both of magnification chromatic aberration and the curvature of an image field, irrespective of a simple constitution, two-group two-lens as the most simple constitutio...
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JP3026241B2 |
PURPOSE: To compensate a large sagittal aberration generated by two surfaces provided across a stop, to widen the interval between a front and a rear group so as to arrange a lens shutter unit, and to prevent a sagittal comatic aberratio...
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JP3024134B2 |
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JP2000081569A |
To improve optical characteristics such as chromatic aberration, etc. This device 1A is composed of five groups comprising a 1st lens group 2 for correcting spherical aberration in the middle image height and comatic aberration of underl...
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JP3021127B2 |
PURPOSE: To obtain a retrofocus type lens which is long in back focus, is miniaturized and is excellent in various aberrations by constituting the most 1st conjugation side lens in the 2nd lens group of a convex meniscus positive lens to...
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JP2000066090A |
To obtain sufficient exposure for a subject having low luminance at low cost by making the open F-number of a photographing lens satisfy a specified condition. This photographing lens is constituted of two lens components and a diaphragm...
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JP3007658B2 |
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