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JP3005905B2 |
PURPOSE:To prevent the performance of the photographing lens from being dropped due to a change in temperature and to inexpensively attain high efficiency by providing the photographing lens with plural plastic lenses and one glass lens,...
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JP2000028914A |
To provide a photographing lens for an image pickup element which is provided with back focus where the various kinds of filter and a protection glass can be arranged and which uses a glass material whose processing is easy and inexpensi...
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JP2000028913A |
To compensate chromatic aberration without increasing the constituting number of a lens by arranging a 1st lens having negative refractive power and a 2nd lens having positive refractive power in order from an object side and forming a g...
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JP3003081B2 |
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JP2000019392A |
To provide a compact, lightweight and inexpensive photographing lens loaded in a camera for inputting an image and a camera for monitoring. This photographing lens is constituted of a 1st lens group 1 having negative refractive power, a ...
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JPH11352397A |
To provide an optical system having excellent image-forming performance where chromatic aberration is corrected without increasing the number of component lenses by making a lens surface have a diffraction effect and to constitute an ima...
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JP2989725B2 |
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JPH11514106A |
PCT No. PCT/EP97/04468 Sec. 371 Date Apr. 6, 1998 Sec. 102(e) Date Apr. 6, 1998 PCT Filed Aug. 15, 1997 PCT Pub. No. WO98/07666 PCT Pub. Date Feb. 26, 1998An achromatic lens system, in particular for uses in the deep ultraviolet range be...
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JP2984956B2 |
PURPOSE: To make the back focus long and provide excellent aberration compensation by using a negative lens group as a 2nd lens group which is relatively close to an object and a meniscus lens which a concave a is directed to the object ...
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JPH11311740A |
To obtain high resolution, to excellently compensate various aberrations over a wide wavelength range and to lower the manufacturing cost by setting the image read lens consisting of a modified Gaussian type lens consisting of six elemen...
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JP2971912B2 |
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JP2970083B2 |
PURPOSE:To obtain the rear focus type zoom lens which is reduced in size on the whole and has excellent optical performance over the entire power variation range and the gradient index lens while having a specific power variation ratio b...
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JP2966080B2 |
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JP2958110B2 |
An afocal zooming optical system includes, in order from the object side, an objective optical unit comprising a positive first lens group, an erecting prism component and a negative second lens group, and an eyepiece optical unit compri...
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JPH11264930A |
To constitute an optical system of one lens, to obtain a wide viewing angle ≥80°, and to realize sufficient optical performance as a camera for monitoring by constituting the optical system of a bivonvex lens and a plane glass in orde...
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JP2954217B2 |
In a projection system wherein an optical system comprising a first lens for correcting a spherical aberration dependent on the aperture length, a second lens for enlargement and a third lens for correcting a field curvature, projects an...
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JPH11249013A |
To provide an image forming lens for image reading, which is lightweight and inexpensive and improves the quality of a formed image, by providing positive, positive, negative and positive configurations successively from the side of an o...
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JPH11231215A |
To provide a lens system with which a high resolution can be provided while reducing a color aberration without expanding a device by providing the system with one set of lenses mutually bonding a front lens group arranged on the side of...
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JPH11223763A |
To reduce the distortion and the chromatic aberration of magnification and to sufficiently secure the telecentric by using a positive lens as the lens nearest to the object in a rear group having a positive power and satisfying a specifi...
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JP2925188B2 |
PURPOSE:To obtain the lens which is free from a deficiency in the quantity of light by specifying the refracting power arrangement of a 1st lens group which has negative refracting power, a 2nd lens group which has the largest lens thick...
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JPH11508700A |
A Cooke triplet projection lens for use in overhead projectors comprises two outer positive elements of an ophthalmic crown glass and one inner negative element of a light flint glass. The crown glass has a refractive index of roughly 1....
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JPH11190817A |
To provide a photographic lens constituted of two-group two lenses having a wide photographing viewing angle without causing the deterioration of various kinds of aberration and the reduction of field illuminance. The photographic lens 3...
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JP2917784B2 |
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JPH11183792A |
To provide sufficient back focus and peripheral light quantity and to reduce coma flare, the curvature of field and chromatic aberration to obtain high image forming performance. This lens is constituted of 1st and 2nd lenses L1 and L2 h...
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JPH11174345A |
To obtain a light and compact wide visual field ocular which is constituted of three groups having positive, negative and positive refractive indexes in order from an object side, where the 1st lens group is constituted of a positive men...
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JP2909765B2 |
PURPOSE:To provide a large-diameter variable power lens which is extremely short in overall length, small in front lens diameter, and has small-sized, lightweight, and low-cost constitution and a high power variation rate by composing th...
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JPH11160615A |
To provide a large-diameter lens obtained by excellently correcting spherical aberration and various aberration even in the case a large diameter lens with a F-number 1.2. This lens is constituted of a front-group lens having positive re...
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JP2595552Y2 |
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JP2895150B2 |
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JPH11133312A |
To make an optical system have the function of a telescope to observe an infinite object and also the function of a microscope to enlarge and observe a minute object in a short distance by providing three lens groups and moving 1st and 2...
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JP2893046B2 |
PURPOSE:To allow the transmission of images having high resolution by providing the above body with a circular section of a radius r0 and specifying the refractive index distribution in at least a 0.25 to 0.70r0 range from the central ax...
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JPH11125767A |
To obtain the small-sized, low-cost photographic lens system which has high performance, long back focus, and excellent telecentricity. This system is equipped with a 1st lens group 10 with negative refracting power, a stop S, and a 2nd ...
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JPH11120810A |
To emit the illuminating light in the front direction in a central part and in the central part direction on the side surface side and avoid reduction in a luminance level on the side surface side through effective use of emitting light ...
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JP2887004B2 |
Disclosed is a projection optical system for projecting an original image onto a screen, including a projection lens comprising, in succession from the screen side, a first lens unit having positive refractive power, and a second lens un...
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JPH11101937A |
To easily cope with a change in the image pickup size, etc., of a video camera to be used by disposing a front group consisting of a convex lens group and a rear group consisting of a convex lens group in this order from a specimen side ...
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JP2881439B2 |
A multifocal birefringent lens system is described together with applications of the lens system such as ophthalmic lenses (including those of the intraocular, contact and spectacle type) and optical instruments and devices including pho...
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JP2881744B2 |
A real image type finder is provided comprising an objective optical system, an eye piece optical system, and an aperture which is arranged in the objective optical system and that is substantially conjugate with an exit pupil. The finde...
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JP2881926B2 |
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JPH1195130A |
To enlarge an apparent visual field and eye relief and to correct the original aberration of an eyepiece and the aberration of a pupil by forming an intermediate image in an optical path between a 1st and a 2nd lens groups by an objectiv...
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JP2879458B2 |
PURPOSE:To compensate an image plane characteristic and a spherical aberration excellently and to maintain excellent picture quality at the peripheral par and the center part of a picture plane by limiting the radii of curvature of the o...
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JPH1184230A |
To provide a wide-angle lend small in size, light in weight, low in cost and also compensative in various aberrations with simple constitution such as four groups and five lenses. This lens is composed of four groups and five lenses, tha...
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JP2873912B2 |
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JP2871021B2 |
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JPH1172704A |
To provide a compact zoom lens having high magnification. Relating to a zoom lens composed, in order from the object side, of a first group Gr1 having a negative power, a second group Gr2 having a positive power, a third group Gr3 having...
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JP2867375B2 |
The current limits of resolution of multi-element optical systems are exceeded by reducing the number of elements while introducing at the critical aperture a blazed transmission grating (60) having grating rings of low bending power def...
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JPH1152228A |
To provide a wide angle lens and a super-wide angle lens for an electronic image camera e.g. a video camera and a digital still camera, specially a wide angle lens having a viewing angle of about 75° and a long back focal distance. This...
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JPH1152229A |
To sufficiently secure back-focal distance and to excellently compensate magnification chromatic aberration and the curvature of field at the periphery part of an image plane by constituting the lens of a front group for diverging action...
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JP2860176B2 |
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JP2859418B2 |
A copying lens system of a three-unit/three-element composition that can be made from relatively inexpensive optical materials and which exhibits satisfactory performance at copying ratios ranging from about 0.5 to 2.0. The lens system i...
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JP2858639B2 |
To obtain an ultraviolet wide-angle lens which has a small F number and a wide field angle and secures a space where plural ND filters, polarizing filters, etc., that are put in and out are arranged between lenses and is excellent in ima...
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