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Patent Searching and Data


Matches 1,051 - 1,100 out of 3,755

Document Document Title
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  
JP2607957B2  
JPH09113964A
To provide the large-diameter photographic lens system which has high performance and large contrast by using a lens material which has a high refractive index, and compensating a spherical aberration and a chromatic aberration while sho...  
JP2637317B2
PURPOSE: To obtain the compact projection lens which is used for a projection type TV and has a plastic lens shaped to have a small asphericity quantity and no inflection point and also has superior machinability and image forming perfor...  
JP2629095B2
PURPOSE: To obtain the projection lens which has a plastic lens having a small sphericity quantity and no inflection point and can project an image of high- quality television with high picture quality. CONSTITUTION: The projection lens ...  
JP2629592B2
PURPOSE: To ensure a long back focus, compared with the focal length, and project a projected image which is satisfactorily aberration-corrected over the whole area of a projecting screen even when the F number is minimized. CONSTITUTION...  
JP2601802B2  
JPH09101452A
To obtain a read lens which is inexpensive and improves the quality of read image while excellently compensating various aberrations and making the lens system compact and wide in field angle by using four lenses which meet specific cond...  
JPH09101451A
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...  
JP2597510B2  
JP2597513B2  
JPH0990213A
To lower the price and secure sufficient performance although the lens system consists of five elements. The photographic lens consists 5-element constitution formed of a concave lens 1 made of glass, a lens 2 made of plastic, a convex l...  
JPH0992601A
To ensure high overlay accuracy even when a projection aligner having a remaining asymmetric random image distortion is used mixedly. A transparent correction plate 8 is interposed between a reticle R and a projection optical system PL. ...  
JPH0990214A
To provide an image forming lens which is light and has a wide field angle and also various aberrations, specially, a chromatic aberration and an image plane excellently corrected by arranging a 1st lens group of ≥3-lens constitution, ...  
JPH0990219A
To obtain a projection lens which suitably obtain video of high picture quality as a projection lens used for a projector device which enlarges and projects video from a cathode-ray tube on a large-sized screen. This projection lens cons...  
JP2596801B2  
JP2596800B2  
JP2596810B2  
JPH0980304A
To provide an objective lens with a wide field angle which consists of about two lenses, has a ≥80° angle, and also has various aberrations compensated excellently by composing the lens of a negative 1st lens and a positive 2nd lens a...  
JP2594450B2  
JP2591755B2  
JPH0968646A
To make it possible to suppress the occurrence of the color differences of spherical aberrations and the occurrence of chromatic aberrations over a wide wavelength range from a near IV region to a near IF region without increasing the nu...  
JPH0961707A
To provide a standard lens system for photographing lens and electronic video apparatus having high depiction performance by improving sagittal comatic aberrations and curvature of field to meet a trend toward a larger aperture diameter....  
JPH0961708A
To provide a standard lens system which is a lens system to be used for general photographing lenses and optical systems for electronic video apparatus using the entire part of a visible region, is improved in the sagittal comatic aberra...  
JPH0961713A
To provide a reading lens of a low cost which is well corrected in various aberrations and has a high contrast in a high space frequency region by well correcting the fluctuation in the focal length at the time of a temp. change by the u...  
JPH0961706A
To well correct various aberrations including chromatic aberrations and to make a lens system compact by including a distributed refractive index lens having such distribution where dispersion increases offaxially into an optical system....  

Matches 1,051 - 1,100 out of 3,755