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JP2002517773A |
Objective lenses employing three lens units U1, U2, U3 having a negative (or weak positive); positive; negative optical power configuration are disclosed. The lenses have a total field coverage of at least 50 degrees with a relative aper...
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JP2002162561A |
To obtain a compact photographic lens, having high resolution, constituted of a small number of lenses, having long back focus and made excellent in telecentricity on image side.This photographic lens is constituted, by arranging an aper...
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JP3288746B2 |
PURPOSE: To provide a high lightness telescopic lens, which can correct the aberration satisfactorily while the inner focus system is adopted and which can ensure good back focusing without prolonging the overall length. CONSTITUTION: A ...
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JP3272436B2 |
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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JP3270591B2 |
PURPOSE: To attain the improvement of the depth of field and the control of brightness corresponding to the characteristic of an endoscope by arranging a variable diaphragm in an optical system. CONSTITUTION: This device is used while in...
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JP2002082281A |
To obtain a bright and compact large aperture ratio objective lens suited to a dark field optical device and capable of generating a large negative distortion aberration by forming telescopic constitution consisting of seven lenses of th...
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JP3264978B2 |
PURPOSE: To make a bright, high-performance lens system possible with a small number of lenses by causing a first lens, which is a radial heterogeneous lens having positive refractive power, to meet specific conditions. CONSTITUTION: A f...
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JP2002055278A |
To provide an image pickup lens device equipped with a high variable power zoom lens system capable of making the reduction of cost compatible with compaction, having an F-value showing a bright condition and having the zoom ratio of abo...
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JP3255490B2 |
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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JP3254165B2 |
To obtain high reading density in the vicinity of image formation magnification 0.16535, to reduce cost and to obtain the sufficient angle of view and sufficient brightness by arranging 1st group to 4th group which are positive, negative...
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JP3254239B2 |
PURPOSE: To obtain the intermediate telephoto lens which has a large diameter and has high optical performance from the infinite distance to a short distance by composing the 1st lens group of three positive meniscus lenses which have po...
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JP2002031753A |
To obtain a comparatively bright and compact wide-angle color image reading lens capable of excellently compensating aberration by constituting the lens of four lenses being four groups and satisfying a specified conditional expression.A...
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JP2002023050A |
To provide a photographing lens constituted of two lenses being two groups, whose image surface illuminance is made bright without deteriorating optical performance and the assembling suitability of a camera.The photographing lens 10 is ...
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JP3247756B2 |
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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JP2002006209A |
To enable changing a radius of curvature at emitting reference plane wave in a wide range while keeping high accuracy, and also, to enable measuring an object to be inspected at an optional position dispensing with a large working space....
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JP3242451B2 |
PURPOSE: To obtain a microscope objective lens which is bright and low in cost and has various aberrations excellently compensated by using a radial type gradient index lens which has a specific refractive index distribution radially fro...
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JP3239520B2 |
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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JP3234618B2 |
PURPOSE: To obtain the large-aperture intermediate telephoto lens which has various aberrations to a short-distance object point well compensated by composing the lens of a 1st and a 2nd lens group, a stop, and 3rd-5th lens groups, and s...
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JP2001318310A |
To provide a single focus lens by which excellent optical performance is obtained while making an entire length short by an inexpensive and simple configuration.A first meniscus lens L1 whose concave surface is faced to an object side, a...
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JP2001519542A |
A projection zoom lens system is used in imaging and non-imaging modes for entertanment and architectural illumination, providing 8:1 zoom ratio in an imaging mode and 20:1 zoom ratio in a non-imaging mode. When coupled with a variable a...
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JP3221765B2 |
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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JP2001281536A |
To obtain a Gauss type lens realizing brightness equal to or above about F1.4, having the angle of view equal to or above about 24 degrees, securing sufficient back focus and excellently correcting aberration in spite of compact constitu...
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JP2001242377A |
To realize miniaturization and high contrast and to correct aberration such as chromatic aberration.This lens is constituted by sticking a 1st lens 11 made of resin material and a 2nd lens 12 made of glass material, and provided with an ...
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JP3201394B2 |
To provide an fθ lens for two-dimensionally scanning optical system for a printed board drilling work capable of realizing high fθ linearity over a wide two-dimensional scanning range, the telecentric characteristic, and the convergenc...
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JP2001176109A |
To provide a compatible optical pickup device utilizing a laser beam of two different wavelengths in a short wavelength band, a compatible optical pickup device capable of effectively correcting the occurrence of aberration owing to rapi...
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JP2001174712A |
To reduce the cost by reducing the number of kinds of lenses to reduce the frequency for setting the condition of a lens working machine.The material and the shape of at least one of lenses in a front end illumination optical system of a...
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JP2001507463A |
The spherical aberration of an optical beam is determined by focusing the beam, and dividing its cross-section in at least two concentric zones. The sub-beams passing through the zones are focused each on a focus-detection system. The di...
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JP2001141995A |
To provide an excellent optical projection lens system for photolithography. A first lens group G1 having a positive refracting power, a second lens group G2 which has a negative refracting power and consists of a waist 37 having a minim...
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JP3168424B2 |
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JP2001133684A |
To obtain a photographic lens system which is composed of four lenses as a whole and has a high telecentric property and a high optical performance. This photographic lens system is composed of a first group, consisting of a meniscus len...
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JP2001100091A |
To provide a photographic lens which has high resolution, small distortion aberration, long back focus, and excellent telecentricity and is compact and few in the number of constitutive lens. The photographic lens meets conditional inequ...
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JP2001504949A |
PCT No. PCT/US97/20144 Sec. 371 Date May 25, 1999 Sec. 102(e) Date May 25, 1999 PCT Filed Nov. 12, 1997 PCT Pub. No. WO98/23988 PCT Pub. Date Jun. 4, 1998A lens system for an electronic system has two lenses. The first lens (S1/S2) has a...
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JP3155360B2 |
PURPOSE: To provide the visual display device by which images can be observed at the angle of view wider than 40° and flat and sharp images can be observed even at the periphery. CONSTITUTION: This visual display device is composed of a...
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JP2001091828A |
To provide a lens for reading an image which is composed of six lenses, namely, positive, positive, negative, negative, positive and positive in this order from an object side, which is comparatively bright, whose angle is wide and whose...
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JP2001083411A |
To make the length of back focus long and to restrain aberration with good balance while attaining a wider viewing angle and high resolution by constituting a wide-angle lens of three lens groups being negative, positive and positive and...
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JP3148221B2 |
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JP2001066523A |
To provide an eyepiece lens used for an observation optical system such as binoculars, a telescope and a microscope capable of excellently compensating aberration to the peripheral part of its field, restraining distortion aberration wit...
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JP3142127B2 |
PCT No. PCT/DE88/00443 Sec. 371 Date May 18, 1989 Sec. 102(e) Date May 18, 1989 PCT Filed Jul. 18, 1988 PCT Pub. No. WO89/00710 PCT Pub. Date Jan. 26, 1989.An ophthalmic lens for use in the correction of astigmation, wherein in order to ...
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JP3140841B2 |
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JP2001051190A |
To provide a large aperture lens in which a distortion aberration is not enlarged but other various aberrations are corrected excellently, by specifying a lens formation. This large aperture lens is composed of first and second lenses L1...
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JP3134880B2 |
A lens system comprising a radial type graded refractive index lens element and a diffraction type lens element so that the refractive power of the radial type graded refractive index lens element is imparted to the diffraction type lens...
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JP3133360B2 |
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JP3130527B2 |
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JP3128125B2 |
PURPOSE:To make a camera thin in the front-rear direction by using a prism which receives and reflects image pickup incident luminous flux by an incidence surface and projects it from a reflecting projection surface, and providing a ligh...
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JP3123947B2 |
A lens unit, for a projector, includes a scrambler which converts light input from a lamp into a uniform light. An image lens unit is arranged on an optical path between the scrambler and a liquid crystal display (LCD) panel for generati...
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JP3122970B2 |
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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JP3121068B2 |
PURPOSE: To provide the photographic lens which has various aberrations excellently compensated and is used for such a microscope that its objective and ocular have curvature of field compensated independently of each other. CONSTITUTION...
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JP3115879B2 |
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JP3117225B2 |
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JP2000321490A |
To obtain a photographic lens which has a ≥60° photographic view angle without degrading the optical performance. This photographic lens 10 has six-group constitution of a 1st lens group 11 to a 6th lens group 16 having negative, posi...
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