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Patent Searching and Data


Matches 801 - 850 out of 3,731

Document Document Title
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...  
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 ...  
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...  
JP3024134B2  
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...  
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...  
JP2000066091A
To provide an image pickup lens which accomplishes an F-number of 2.8 and an viewing angle of 40° despite of few number of lens configuration, and has a long back focal length required for an electronic pickup element and excellent tele...  
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...  
JP3007658B2  
JP3005905B2  
JP2000035533A
To improve assemblability by restraining the deterioration of optical performance caused by eccentricity and also to make compensation for the various kinds of aberration excellent in an image pickup lens constituted of two lenses. This ...  
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...  
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...  
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...  
JP3003081B2  
JP2000019394A
To obtain a compact projection lens whose back focus is long, whose whole length is short, which is provided with telecentric property and whose chromatic difference of magnification and distortion aberration are corrected. This projecti...  
JP2000019387A
To obtain an image-formation lens which can cope with wide use such as photographing, whose image surface is flat and where various aberrations are excellently corrected by constituting an image-formation lens of a 1st lens group having ...  
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 ...  
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...  
JP2000009996A
To provide a compact projection optical system in which a good image formation performance is obtained even though color synthesis is conducted by mirrors. The system is provided with color synthesis mirrors M1 and M2, which conduct colo...  
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...  
JP2989725B2  
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...  
JP2971912B2  
JP2970083B2  
JPH11295592A
To widen a viewing angle while securing required back focus though compact and inexpensive 2-lens constitution by adopting a lens on an object side of a retro-focus type whose surface on the object side is a convex surface and satisfying...  
JP2966080B2  
JPH11271604A
To reduce the degradation of image formation performance by atmospheric pressure change in the atmosphere and in vacuum and to perform use even in a change where the environment condition of an atmospheric pressure largely changes. At th...  
JPH11271606A
To reduce various aberrations, especially an image surface curve amount, to respective light beams from respective light sources in the case of performing multi-beam scanning by disposing a negative lens, negative and positive joined len...  
JP2958110B2  
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 ...  
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...  
JP2954217B2  
JPH11258500A
To provide an image reading lens which is excellent in chromatic aberration compensation and suitable for a color image reading lens by prescribing glass material according to partial variance ratio and Abbe number about the lens which i...  
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...  
JPH11237542A
To provide a lens almost at a diffraction limit at the F number of not only 1:22 but also 1:16 and 1:11 by forming a positive meniscus lens from the glass of a refractive index not more a specified value and an Abbe number larger than a ...  
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...  
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...  
JPH11223762A
To provide a telecentric objective lens in which a field angle can be widened, and full lens length can be shortened by adopting a retro-focus type. This objective lens is provided with a first group 103 consisting of a meniscus-shaped n...  
JP2925188B2  
JPH11508700A  
JPH11194264A
To provide a monochromatic image observing optical system in which dust and dirt stuck to a monochromatic filter are inconspicuous on an image forming plane and a whole size and the size of image are made large compared with a general mo...  
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...  
JPH11190820A
To allow reading angle to be wider and to improve the quality of the read picture at a low cost by using a four lens constitution and satisfying special conditions. A first lens L1 is a positive meniscus lens having a convex face on an o...  
JP2917784B2  
JPH11183796A
To provide an image pickup optical system having the small fluctuation of aberration to a photographing distance by composing this system of four groups composed of a first and fourth groups of meniscus lenses having a positive and negat...  
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...  
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...  
JP2909765B2  
JPH11167061A
To provide a photographing optical system capable of improving chromatic aberration and obtaining high image quality, reduced in the number of composing lenses, small in size, light in weight, and low in cost. This photographing optical ...  

Matches 801 - 850 out of 3,731