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JP07049449 |
PURPOSE: To provide a reverse Galilean finder in which the distance from the final lens surface of an ocular to an eye point is extended, and a satisfactory finder image can be observed without vignetting even in water by properly consti...
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JP07035973 |
PURPOSE: To obtain a wide angle lens with wide angle of field, small open F-number, simple constitution, and by which aberration up to the periphery of a screen can be corrected satisfactorily by employing four-group lens consitution and...
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JP07035972 |
PURPOSE: To obtain a triplet lens which maintains sufficient ambient light quantity and by which various kinds of aberration can be corrected satisfactorily and provided with a viewing angle ≥65° by employing triplet lens component co...
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JP07013070 |
PURPOSE: To increase the degree of freedom of the designing of the optical system with the negative lens and to reduce the manufacture cost at the same time. CONSTITUTION: An optical system which uses an area other than the optical axis ...
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JP07013071 |
PURPOSE: To obtain a lens system of small-sized constitution which has excellent optical performance by composing the system of 1st - 3rd lenses and a stop and satisfying specific conditions. CONSTITUTION: The lens consists of the 1st le...
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JP07005354 |
PURPOSE: To simplify the constitution of a lens barrel and to unnecessitate a spacing ring having a compricated shape by equalizing the maximum lens diameters of all lens groups to be the same and positioning each lens group by mechanica...
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JP07005358 |
PURPOSE: To provide a miniaturized and light weight reading optical system by using a single lens by composing the system of the respectively specified diaphragms and a positive meniscus lens whose concave surface confronts the side of t...
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JP06347694 |
PURPOSE: To provide a retro-focus type large aperture lens composed of six lenses and capable of improving various aberrations even with a F number of about 1.2 and a back focus longer than 1.1f by making a third lens a meniscus lens who...
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JP06347695 |
PURPOSE: To realize high projecting magnification, to simultaneously compensate higher order distortion aberrations and chromatic aberration and to obtain excellent image forming performance by comprising plural lens groups and satisfyin...
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JP06337348 |
PURPOSE: To well correct various aberrations and more particularly chromatic aberrations and to obtain optical performance high over the entire part of object distances by adequately setting the lens constitution and glass materials of r...
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JP06337347 |
PURPOSE: To correct the axial chromatic aberration and magnification chromatic aberration generated in a lens system having a uniform refractive index by combining radial GRIN rod lenses having a refractive index distribution in the radi...
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JP06331887 |
PURPOSE: To provide a compound lens by which the pattern of a diffraction grating can be accurately transferred, whose inside refractive index does not become uneven because of environmental change, which has stable lens performance and ...
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JP06317743 |
PURPOSE: To facilitate the manufacture and to suppress the restriction on the design of an image forming lens system to minimum by compensating the aberrations comprised in the image forming lens system by means of a specified aberration...
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JP06308383 |
PURPOSE: To enable underwater photography with high image formation performance over a wide range from an infinite distance to a short distance corresponding to unmagnification by employing a system of two-group constitution of a front g...
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JP06308384 |
PURPOSE: To provide the lens which has an about 60° field angle and luminance of F number 2 by composing the lens of a positive meniscus lens which is convex to the object side, a biconcave lens, a biconvex lens, and a negative meniscus...
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JP06308381 |
PURPOSE: To provide the wide-angle endoscope objective which is short in overall length and small in external diameter and has its distortion aberration compensated excellently by composing the endoscope objective of a front and a rear g...
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JP06308386 |
PURPOSE: To provide the large-diameter macrolens which have aberrations compensated excellently from an infinite distance to a short distance corresponding to unmagnification by composing the lens of a front group which has at least one ...
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JP06300988 |
PURPOSE: To obtain a collimator lens which has a chromatic aberration of a secondary spectrum, etc., compensated and also has high optical performance. CONSTITUTION: The collimator lens is composed of three lenses in total including at l...
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JP06297595 |
PURPOSE: To form refractive index distribution in a planar direction by fixing the photosensitive refractive index control agent in a transparent base material by irradiating the base material with laser beam having intensity distributio...
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JP06289327 |
PURPOSE: To reduce the thickness of the spectacle lens and improve the fashionability by combining lenses which are different in refractive index and also different in unevenness. CONSTITUTION: More than two kind of lenses which differ i...
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JP06290932 |
PURPOSE: To lessen a unit in size by a method wherein a yoke forming a magnetic circuit is formed in one piece together with the base plate of a unit possessed of a magnetic circuit, or a part of the base plate is made to serve as the yo...
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JP06273822 |
PURPOSE: To eliminate the need of replacing a driving part even in the case a lens barrel is replaced by separably integrating a substrate for assembling a magnet rotor and an electromagnet coil in a circular-arculate shape and a base pl...
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JP06273666 |
PURPOSE: To provide the lens for projector lamp which has a satisfactory optical performance and has FNO≤1 to be bright and is superior in productivity and is produced at a low cost and is light-weight. CONSTITUTION: This lens has a co...
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JP06265784 |
PURPOSE: To provide an image-forming element easy to manufacture as compared with a rod lens array. CONSTITUTION: This image-forming element is comprised by arranging plural transparent members 3 provided with both distribution in which ...
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JP06265781 |
PURPOSE: To obtain a wide angle photographic lens of wide angle of view with small distance between a first surface and a final surface, high performance, and large aperture of F/2.8 class by constituting a lens system of a front group w...
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JP06265780 |
PURPOSE: To obtain a wide angle photographic lens with small distance between a first surface and a final surface. high performance, and large aperture of F/2.8 class by constituting both a front group of at least two positive lenses and...
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JP06258574 |
PURPOSE: To provide a photographic lens which is excellently assembled in the main body part of a film unit or a camera and small in spherical aberration and has high performance from the periphery to the center in spite of an asymmetric...
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JP06242369 |
PURPOSE: To provide an amphibian lens system capable of obtaining effective description performance in both of air and water only by arranging two lenses in the front of a lens system whose aberration is effectively corrected in air. CON...
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JP06242370 |
PURPOSE: To obtain a compact and large aperture photographing lens whose various abberations are effectively corrected by arranging the 1st to 7th lenses and satisfying specific conditions. CONSTITUTION: The 1st meniscus-shape lens havin...
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JP06235858 |
PURPOSE: To obtain a high performance photographic lens suitable to a lens shutter camera with less performance deterioration to the peripheral part of a film plane though the lens is simply constituted. CONSTITUTION: As to a lens system...
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JP06235857 |
PURPOSE: To maintain a sufficient peripheral light quantity, to satisfactorily correct astigmatism, and to attain a wide field angle by fulfilling a specific condition by each lens component. CONSTITUTION: This device is constituted of t...
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JP06230283 |
PURPOSE: To obtain a zoom lens having a small number of lenses, the excellent performance and well corrected aberration by providing at least one gradient refractive index lens having the gradient of refractive index in the direction of ...
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JP06230273 |
PURPOSE: To provide a radial type gradient refractive index lens whose Petzval's sum and a chromatic aberration are excellently compensated by comprising a refractive index distribution in the radial direction from an optical axis and sa...
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JP06222260 |
PURPOSE: To provide a compact photographic lens with large aperture which is excellent in drawing property by specifying the space on the optical axis between the first lens from a subject side and the second lens, the core thickness of ...
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JP06208054 |
PURPOSE: To provide a projection lens system for back projection-type TV, which can secure a bright picture and a sufficient picture angle and which can easily adjust a color aberration by reducing the number of required lenses compared ...
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JP06201991 |
PURPOSE: To execute reading of high definition, to decrease the number of lens pieces, and to reduce the cost of lens working and assembly by constituting a triplet type lens by adopting a special aspherical lens for a second group. CONS...
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JP06201829 |
PURPOSE: To provide a distance-measuring method and device which can measure distance accurately even if there is a traveling displacement such as fine vibration on a surface to be measured. CONSTITUTION: The measuring device is provided...
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JP06175016 |
PURPOSE: To eliminate on-axis chromatic aberration and magnification chromatic aberration and to correct spherical aberration and curvature of field in good balance by providing specific refractive index distribution in a radial directio...
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JP06175017 |
PURPOSE: To correct coma aberration and astigmatism, etc., satisfactorily while attaining the miniaturization of the whole lens system by setting the thickness and refracting power of each lens at specific values. CONSTITUTION: This lens...
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JP06160605 |
PURPOSE: To obtain the spherical piano-convex microlens which is suitable for stable production where optical performance is precisely made uniform and also suitable to array constitution by specifying the refractive index, radius of cur...
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JP06148517 |
PURPOSE: To provide a photography lens having a wide view angle of about 2Ω=64° and an F number of 4 or 5 for a small-sized compact camera at a low cost. CONSTITUTION: A triplet lens system comprises s positive meniscus lens having a c...
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JP06148516 |
PURPOSE: To manufacture an image forming element easily by setting refraction factors along thickness of a transparent prism body to have an approximate refraction factor distribution to a specified curve of the second order, providing a...
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JP06130290 |
PURPOSE: To keep aberrations small and to make the position of exit pupils far from an image-formation surface by arranging a diaphragm on the object side of a lens group having positive refracting power as a whole, making a lens on a si...
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JP06130291 |
PURPOSE: To provide a standard lens having performance which is stable from an object point at infinity to the object point at short distance, having a constitution capable of keeping a mirror inhibiting area, and having a large aperture...
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JP06118300 |
PURPOSE: To provide a single lens and an optical device using it suitable for photometry or eyeball image formation by properly setting the first lens plane and the second lens plane. CONSTITUTION: Both the first lens plane r1 and the se...
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JP06094989 |
PURPOSE: To correct the entire image aberration and to use a module type by a simple structure by providing special relation among the refractive index of at least one positive lens, the refractive index of at least one negative lens and...
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JP06088939 |
PURPOSE: To embody a photographing lens good in aberration compensation and having wide photographing viewing angle with a low cost single lens by making at least one surface of a biconvex single lens aspherical shape and satisfying a sp...
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JP06082697 |
PURPOSE: To make the zoom lens compact and low in cost while maintaining high power and superior optical performance over the entire power variation range. CONSTITUTION: The zoom lens consists of a 1st negative group Gr1, a 2nd positive ...
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JP06059190 |
PURPOSE: To provide the copying machine lens system, composed of two radial type GRIN lenses having refractive index distributions radially from the optical axes, and the read lens system. CONSTITUTION: The copying machine lens system is...
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JP06051195 |
PURPOSE: To obtain an inexpensive triplet lens having a relatively large radius of curvature and excellent performance by composing the triplet lens of a positive meniscus lens, a biconcave lens, and a biconvex lens, and satisfying speci...
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