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Patent Searching and Data


Matches 1,001 - 1,050 out of 3,731

Document Document Title
JPH103033A
To satisfactorily correct spherical aberration of a luminous flux of which numerical aperture exceeds 1 by providing an immersion system objective lens with a front group of an approximately afocal system and a rear group having a positi...  
JPH09329766A
To display a stable low pass effect and the obtain a satisfactory picture by forming a prescribed continuous shape and refractive index distribution in a radial direction by setting up the enter of an incident luminous flux as an origin ...  
JPH09329740A
To obtain a long focal distance, comparatively long back focus, high level color correction, low distortion, and obtusity to a temperature change by arranging lens parts in the order of low dispersion, low dispersion, high dispersion, an...  
JPH09329739A
To provide an optical system reducing the number of constitutional lenses, considering the difficulty and cost of manufacturing of a low material and capable of attaining sufficiently enough performance and miniaturization by the use of ...  
JP2692996B2  
JP2690765B2  
JPH09325264A
To locate an exit pupil at almost infinity and to shorten a total length by providing a lens having a positive refractive power provided in the vicinity of an image plane between a main optical system and a solid-state image pickup eleme...  
JPH09318872A
To correct shake without changing a focal distance in an a focal state even in the same inserting a lens between light beam by opposing a planoconave lens to a planoconvex lens through a small cavity and specifying relation between the r...  
JP2683895B2  
JPH09304695A
To obtain a compact and bright image-formation lens securing a long back focus and a wide field angle and realizing the reduction of cost in the case of mass production by making the lens a retrofocus type lens constituted of two concave...  
JP2683463B2  
JP2679130B2  
JP2679017B2  
JP2677711B2  
JP2676000B2  
JPH09292565A
To make the angle of view wide, to make the lens bright, to insert various optical members such as a low-pass filter, etc., between a lens system and an image pickup element, to attain long back focus and to obtain high optical performan...  
JPH09292566A
To make the angle of view wide, to make the lens bright, to insert various optical members such as a low-pass filter, etc., between a lens system and an image pickup element and to obtain high optical performance by specifying the ratio ...  
JPH09288235A
To provide an image forming lens having a high image filed illuminance even in the case of using in an unmagnified state, and also capable of suppressing the fluctuation of various kinds of aberration. The image forming lens 16 is consti...  
JPH09281388A
To set the number of lenses to about 2 to 4 and to excellently compensate aberration by providing a radial type refractive index distribution lens having axially symmetric refractive index distribution in a radial direction in a rear gro...  
JP2665274B2  
JPH09265037A
To smoothly and easily perform driving control corresponding to a zoom lens where not only a movable lens group for focusing but also a movable lens group for variable power are moved in the case of focusing by providing a movable lens g...  
JPH09258098A
To obtain very satisfactory optical performance from infinity to a close range in a photographing range in spite of having a large aperture, to make the constitution compact and simple, and to reduce the cost by satisfying a specified co...  
JPH09258100A
To obtain a lens system, lens working of which is simple and inexpensive even when the image plane size is small, which is comparatively bright, and where aberration compensation is excellently performed, by constituting the system of fo...  
JP2659101B2  
JPH09243936A
To provide a finder optical system for a single-lens reflex camera with excellent visibility by excellently correcting distortion aberration with a simple constitution. This system is the finder optical system for observing a subject ima...  
JP2652637B2  
JP2652662B2  
JPH09236745A
To obtain a stable beam radius and a constant speed characteristic over the entire region of the surface to be scanned by specifying the constitution of the lenses having a meniscus shaped first lens and a second lens having a positive p...  
JP2650309B2  
JP2646350B2  
JPH09222560A
To obtain the image forming lens for image reading which consists of a small number of lens elements and is short in overall lens length, small- sized and inexpensive, and excellent in formed image quality by interposing a stop in the le...  
JP2639983B2  
JPH09203858A
To make the overall length of an optical system short, decrease the number of lenses, make small variation in the size of an image when the image is defocused as a body shift in position, and make astigmatism and distortion small by usin...  
JPH09197262A
To make it possible to greatly shorten the calculation time required for optimization processing, to enhance the efficiency of the calculation and to accelerate the optimization processing by adopting a method of repetitively executing t...  
JP2636501B2  
JPH09189856A
To obtain a photographing lens which shows excellent performance to the half angle of view being ≥25° in a state where an f-number is about 2.8 in short focal distance and whose back focus is longer than the focal distance by making t...  
JPH09179004A
To form an image reduced so that lateral magnification and longitudinal magnification may be different and to obtain a photograph where magnification is varied according to the necessity of a user by specifying the constitution of a lens...  
JP2628629B2  
JPH09171136A
To provide a reading optical system capable of reading even a color original whose chromatic aberration is compensated well despite of a large apertue, a wide view angle and the aperture efficiency of about 100%. In order to excellently ...  
JP2624468B2  
JPH09159908A
To excellently correct chromatic aberration and Petzval's sum by constituting a lens of a homogeneous lens having negative refractive power and a specified radial type refractive index distribution lens which has positive refractive powe...  
JPH09159907A
To obtain excellent image-formation performance with two-lens constitution by constituting a lens of a homogeneous lens having negative refractive power and a specified radial type refractive index distribution lens which has positive re...  
JP2617908B2  
JP2619632B2  
JPH09138342A
To obtain the lens for the small-sized solid image pickup element which consists of a small number of lens elements and is a wide-angle system by arranging a low-pass filter between the front and rear groups. This lens consists of the fr...  
JPH09138346A
To enhance the picture quality of the projection television by improving the sagittal modulation transfer function set by constituting the set with a cathode-ray tube, a screen, and the projection lens system. The projection lens system ...  
JPH09133860A
To compensate various aberrations needed in terms of performance with good balance and obtain an inexpensive lens by specifying the refractive indexes of at least two lenses including a 1st lens. The lens composed of a 1st positive menis...  
JPH09133859A
To obtain the photographic lens which has excellent performance for an about 2.8 F number, short focal length, and a half field angle of ≥25° and also has long back focus and is suitable for, specially, a CCD camera. This lens consist...  
JPH09127414A
To obtain brightness and good chromatic aberrations by specifically arranging partly joined plural lenses and forming the lens for reading so as to satisfy specific conditions. The positive meniscus lens L1, the positive lens L2, the neg...  
JP2607959B2  

Matches 1,001 - 1,050 out of 3,731