Abstract: A imaging module has an electronic imager and an objective lens system. The electronic imager has an active area that is typically rectangular is shape. An image is formed on the active area with a maximum effective image dimension DI. An objective lens system forms an image of a distant object on the image plane. The objective lens system has a focal length f0 and a height TT. A first lens element has a convex first surface that faces the object and a second surface. The first lens element has a positive power. A second lens element has a concave first surface facing the first lens second surface and an aspherical second surface facing the image plane. The first and second lens elements are shaped and spaced to obtain a ratio of f1/f0 from 0.5 to 2.0, and ratio of TT/DI<1.5.

Abstract: An imaging lens system includes, in the named order from the side of an object toward an image surface, a light amount diaphragm, a first lens having a positive power with a main power on the side closer to the image surface, a meniscus-shaped second lens having a negative power with a strong concave surface turned toward the image surface. Thus, it is possible to provide the imaging lens system in which a sufficiently high resolution can be obtained, while meeting the demand for a reduction in entire length of an optical system to provide the compactness.

Abstract: A imaging module has an electronic imager and an objective lens system. The electronic imager has an active area that is typically rectangular is shape. An image is formed on the active area with a maximum effective image dimension DI. An objective lens system forms an image of a distant object on the image plane. The objective lens system has a focal length f0 and a height TT. A first lens element has a convex first surface that faces the object and a second surface. The first lens element has a positive power. A second lens element has a concave first surface facing the first lens second surface and an aspherical second surface facing the image plane. The first and second lens elements are shaped and spaced to obtain a ratio of f1/f0 from 0.5 to 2.0, and ratio of TT/DI<1.5.

Abstract: A cemented lens group including two lens elements, which are cemented to each other by an adhesive; wherein an adhesive layer formed by the adhesive between the two lens elements has elasticity, and the following condition(1) is satisfied: |&Dgr;&agr;·D/d|<0.03  (1). &Dgr;&agr; designates a difference in linear expansion coefficient between the two lens elements, D designates the diameter of each of the lens elements, and d designates a thickness of the adhesive layer.

Abstract: An imaging lens of fixed focal length is formed of, in order from the object side, an aperture diaphragm, a first lens component having positive refractive power and having at least one aspheric lens surface, and a second lens component having positive refractive power and having at least one aspheric lens surface. The imaging lens satisfies two specified conditions so as to favorably correct distortion and curvature of field while providing a sufficient distance from the imaging lens to the exit pupil of the imaging lens. In addition, one or more of the lens components may each be formed of a single lens element.

Abstract: A miniature image capturing lens includes an aperture diaphragm; and a lens system consisting of a first lens having a positive refracting power in which a convex surface of the first lens is directed toward an image; and a meniscus-shaped second lens in which a concave surface of the meniscus is directed toward an object. The aperture diaphragm, the first lens and the second lens are aligned in this order from the object side, the fist and second lenses have at least one aspherical surface. The following conditional formulas are satisfied: 0.50<f1/f<0.80 0.30<(R2+R1)/(R1−R2)<1.20 where f1 is a focal length of the first lens, f is a focal length of the entire image capturing lens, R1 is a radius of curvature of the object side surface of the first lens, and R2 is a radius of curvature of the image side surface of the second lens.

Abstract: A junction lens device is made by joining a high refractive lens and a low refractive lens using an adhesive. A coating layer for index matching is formed on a surface of at least one of the high refractive lens and the low refractive lens contacting the adhesive to reduce a reflection ratio on a junction surface. The coating layer is formed such that a reflection ratio on the junction surface with respect to a visible light ray is not more than about 0.2%.

Abstract: An imaging lens comprising, in sequence from the object side to the image side: an aperture diaphragm, a first lens, a second diaphragm, and a second lens; the first lens consisting of a meniscus-shaped lens having positive power with a concave face oriented towards the object side; the second lens consisting of a meniscus-shaped lens with a concave face oriented towards the image side; wherein at least one face of the first lens is an aspherical face, and one or more faces of the second lens is an aspherical face, in such a manner that the imaging lens as a whole is a lens system comprising at least two aspherical faces, and satisfying each of the following condition equations (1), (2), (3). 0.01<|f1|/|f2|<0.6  (1) 0.3f<|R2|<0.6f  (2) 0.5f<D0<1.

Abstract: A corrector optic is provided, for use in a camera system that includes a thick prism in front of the focal plane. The corrector optic includes preferably two lenses to be aligned on the optical axis of the camera system. When coupled within the camera system, the corrector optic is disposed between the objective lens and the prism. A preferred corrector optic includes a positive lens having a convex surface facing the objective lens and a negative lens having a concave surface facing the prism, such that the lenses together reduce spherical and coma aberrations caused by imaging through the prism. Chromatic aberration is also reduced by choosing the negative lens material to have a higher index of refraction and higher dispersion than those of the positive lens material.

Abstract: An imaging lens for an image pickup device consists of two lens components that may each consist of a lens element. In order from the object side, these lens components have negative and positive refractive power, with each lens component having two aspheric surfaces. A stop is positioned between the lens components so as to be closer to the image-side lens component. Specified conditions are satisfied in order to miniaturize the imaging lens, reduce manufacturing and assembly costs, and improve imaging performance.

Abstract: A wide-angle lens system includes a negative first lens group, and a positive second lens group, in this order from the object. The negative first lens group and the positive second lens group are positioned so that the distance between the negative first lens group and the positive second lens group is set as the maximum distance in the wide-angle lens system.

Abstract: Projection lenses for use with pixelized panels (PP) are provided. The projection lenses have a negative first unit (U1) separated from a positive second unit (U2) by a reflective surface (RS) which folds the lens' optical axis. The lenses are telecentric on the short conjugate side, have a large field of view in the direction of the long conjugate, and have low aberration levels, including, in particular, low levels of lateral color.

Abstract: An imaging lens system includes a first lens 2 which is a meniscus lens with its convex face turned toward the object side and having a positive power, a diaphragm 3, and a second lens 4 which is a meniscus lens with its concave face turned toward the object side. The first lens 2, the diaphragm 3 and the second lens 4 are disposed sequentially in the named order from the side of the object toward an image surface. In the imaging lens system, the following conditional expressions are satisfied: 1.25×fl≧L≧0.8×fl; 1.26×fl≧f1≧0.85×fl; 0.8×d1≧d2≧0.35×d1; L≦6.25 mm; d1≧0.225×fl; and d3≧0.225×fl, wherein L is a distance of the entire length of the lens system; fl is a focal length of the entire lens system; f1 is a focal length of the first lens; d1 is a thickness of the center of the first lens; d2 is a distance between the first and second lenses; and d3 is a thickness of the center of the second lens.

Abstract: Simple, inexpensive and durable multi-element lens systems are provided. These lens systems may be optically coupled to digital image-capturing devices, such as those used in digital cameras. Some lens systems of the present invention include a glass microsphere bonded to a planar surface of a glass hemisphere. In preferred lens systems, the thickness of the glass hemisphere is selected to form an image plane for transmitted light that is tangent to the surface of the microsphere. Accordingly, in digital cameras fabricated with such lens systems, the glass microsphere can be attached directly to a digital image-capturing device. These preferred lens systems require no focusing adjustment and are suitable for applications to requiring a wide field of view. In some embodiments, the glass microsphere is bonded to the glass hemisphere using a light-absorbing material in order to create an apodized pupil.

Abstract: A retrofocus wide-angle lens includes a first lens group of negative refractive power, a diaphragm, and a second lens group of positive refractive power. The first lens group includes an object-side lens group, a middle lens group, and an image-side lens group. The object-side lens group includes a plurality of negative lens components and a positive meniscus lens component with its convex surface on the image side. The middle lens group satisfies a particular focal length condition and includes a negative lens component at the object side. The image-side lens group includes a negative lens element and a positive lens element. The first and second lens groups include lens elements of opposite refractive power that are made of anomalous dispersion glass so as to provide chromatic aberration correction and to compensate for variations in refractive index with temperature change that would otherwise cause the focal length to vary with temperature.

Abstract: An image pickup lens that has therein, in the order named from an object side, an aperture stop, a meniscus-shaped first lens having positive refracting power whose convex surface faces an object and a second lens having positive or negative refracting power whose convex surface faces the object, wherein each of the first lens and the second lens has at least one aspheric surface and satisfies the following condition expression f1/|f2|<1.0 wherein, f1 is a focal length of the first lens, f2 is a focal length of the second lens and f is a focal length of the entire system of the image pickup lens.

Abstract: The present invention discloses a dual-lens hybrid diffractive/refractive imaging system comprising: a first lens including a concave surface and a convex surface; and the second lens including a convex surface and a concave surface. The concave surface of the first lens is an objective surface facing the object. The convex surface faces the convex surface of the second lens, while the concave surface of the second lens faces the charge-coupled device (CCD) through a filter. Any surface of the first lens and the second lens is spheric or aspheric. Moreover, the imaging system comprises at least one diffractive surface, referred to as a hybrid diffractive/refractive surface, formed on any surface of the two lenses. Therefore, aberration is eliminated and image quality is improved without increasing the number of lenses.

Abstract: In an objective, in particular a microscope objective, wherein the objective has a first optics group on the object side with positive refractive power and a second optics group with negative refractive power following the first optics group, and wherein the first optics group contains a plurality of refractive elements, the first optics group contains at least one diffractive element with a refraction-increasing and achromatizing effect.

Abstract: An optical lens device assembly is provided which is capable of being substantially free from a deviation in an optical axis of an optical lens caused by errors of its manufacturing, thus preventing a drop in coupling efficiency and enabling easy alignment of the optical axis of the optical lens. One of end faces of two optical lens is used as a lens plane and the two optical lens are optically in series coupled. The two optical lenses are placed in a manner that their non-lens planes face each other.

Abstract: A cemented lens group includes two lens elements, cementing surfaces of the two lens elements being cemented to each other by an adhesive, wherein the adhesive forms an adhesive layer between the cementing surfaces. A filler made of minute solid material is dispersed throughout the adhesive layer. Alternatively, a spacer which determines the thickness of the adhesive layer is provided around the peripheral portions of the cementing surfaces.

Abstract: A low-cost, single focus lens that is formed of only four lens elements in two lens groups, one on each side of a diaphragm, is disclosed. A front negative lens group is formed of a first, positive meniscus lens element and a second, negative meniscus lens element, each with its convex surface on the object side. A rear positive lens group is formed of a third lens element that is biconvex and a fourth element that is made of plastic. The fourth optical element has relatively weak refractive power that is less than 10% that of the low-cost, single focus lens, and at least one surface of the fourth optical element is aspheric. Various conditions are satisfied so as to ensure that aberrations are favorably corrected while keeping manufacturing costs low and so as to ensure that the low-cost, single focus lens is compact.

Abstract: A pair of optical lenses comprising a first biconvex optical lens having two equivalent aspheric optical surfaces and a second biconvex optical lens having two equivalent aspheric optical surfaces positioned spaced apart from the first biconvex optical lens, wherein the first optical lens is adapted to shape the light emitted from a source optical fiber into one of a converging, diverging, and collimated beam and the second optical lens is adapted to focus the beam into a receiving optical fiber such that the light emitted from the source optical fiber is coupled into the receiving optical fiber.

Abstract: An optical lens device assembly containing an optical lens device and an optical device sealed without causing complication of optical module configurations is provided. In the optical lens device assembly, a resin member having light transmittance is used to fill in space between the optical lens device and the optical device to be optically coupled to the optical lens device. The resin member is made from a resin material having a refractive index being different from that of the optical lens device. The resin member is used to seal a clearance between optical planes, which face each other, of the optical lens device and the optical device, and to mechanically couple the optical lens device to the optical device.

Abstract: An imaging lens of fixed focal length is formed of, in order from the object side, an aperture diaphragm, a first lens component having positive refractive power and having at least one aspheric lens surface, and a second lens component having positive refractive power and having at least one aspheric lens surface. The imaging lens satisfies two specified conditions so as to favorably correct distortion and curvature of field while providing a sufficient distance from the imaging lens to the exit pupil of the imaging lens. In addition, one or more of the lens components may each be formed of a single lens element.

Abstract: An object of the present invention is to provide a fisheye lens, in spite of its compactness, having an angle of view of 180 degrees and a fast f-number of 2.8 with securing sufficient back focal length and suitable for a digital camera. The fisheye lens consists of a front lens group G1 having negative refractive power and a rear lens group G2 having positive refractive power locating with a space along the optical axis apart from the front lens group G1. The front lens group G1 includes a plurality of negative lens components, L1 and L2. The rear lens group G2 includes at least one cemented lens L5, and given conditional expressions are satisfied.

Abstract: An optic having optimized high spatial resolution, minimal nonlinear magnification distortion while at the same time having a limited chromatic focal shift or chromatic aberrations. The optic located at the distal end of an endoscopic inspection tool permits a high resolution, narrow field of view image for medical diagnostic applications, compared to conventional optics for endoscopic instruments which provide a wide field of view, low resolution image. The image coverage is over a narrow (<20 degrees) field of view with very low optical distortion (<5% pin cushion or barrel distortion. The optic is also optimized for best color correction as well as to aid medical diagnostics.

Abstract: A miniature image capturing lens includes an aperture diaphragm; and a lens system consisting of a first lens having a positive refracting power in which a convex surface of the first lens is directed toward an image; and a meniscus-shaped second lens in which a concave surface of the meniscus is directed toward an object. The aperture diaphragm, the first lens and the second lens are aligned in this order from the object side, the fist and second lenses have at least one aspherical surface.

Abstract: A taking lens comprises a first meniscus lens opposing its convex surface to an object side and a second lens having a positive power. An image side surface of the first lens and an object side surface of the second lens are aspherical. The taking lens satisfies the following condition: 0.25≦F/F1≦0.39 −2.5≦F/R3×fno≦1.5 wherein F represents a focal length of the taking lens, F1 represents a focal length of the first lens, R3 represents a radius of the curvature of the object side surface of the second lens, and fno represents a f-number of the taking lens at open aperture.

Abstract: An objective lens system consisting of a first lens unit having a negative refractive power and a second lens unit having a positive refractive power wherein the first lens unit or the second lens unit comprises at least one radial type gradient index lens element which has a refractive index distribution in a radial direction from an optical axis. This objective lens system favorably corrects chromatic aberration and other aberrations by adequately selecting a value expressing an Abbe's number and a refractive power of medium for the radial type gradient index lens element.

Abstract: The relay optical system comprises, in order from the intermediate image position I toward the the exit pupil EXP side, a first unit G1 having a negative refracting power and a second unit G2 having a positive refracting power, wherein the distance from the rearmost surface of the second unit to the exit pupil position is at least 30 mm. The relay optical system allows a photographing apparatus to be mounted on a microscope without the microscope and the photographing apparatus excluding each other from their predetermined positions.

Abstract: In order to provide a large relative-aperture super wide-angle lens having the inclusive angle of 2 &ohgr;=115° or more with the conventional projection method (y=f·tan &thgr;) having the relative-aperture of about F 2.8, having compactness and high optical performance, and having small variation of aberration in relatively close object distance, the lens includes, in order from the object, a divergent lens group Gn having negative refractive power and a convergent lens group Gp having positive refractive power, and the divergent lens group Gn includes at least one aspherical negative lens, and the aspherical lens satisfies predetermined conditional expressions.

Abstract: A low-cost, single focus lens that is formed of only four lens elements in two lens groups, one on each side of a diaphragm, is disclosed. A front negative lens group is formed of a first, positive meniscus lens element and a second, negative meniscus lens element, each with its convex surface on the object side. A rear positive lens group is formed of a third lens element that is biconvex and a fourth element that is made of plastic. The fourth optical element has relatively weak refractive power that is less than 10% that of the low-cost, single focus lens, and at least one surface of the fourth optical element is aspheric. Various conditions are satisfied so as to ensure that aberrations are favorably corrected while keeping manufacturing costs low and so as to ensure that the low-cost, single focus lens is compact.

Abstract: This specification discloses an imaging lens system having a front lens component disposed forwardly and a rear lens component of positive power disposed rearwardly with an aperture stop interposed therebetween. Particularly, it discloses an imaging lens system in which the arrangement, shapes and materials of lenses constituting the front lens component and the rear lens component, a focusing method, etc. are specified from various points of view, whereby which is suitable, for example, as the photo-taking lens of a digital still camera.

Abstract: A compact photographic lens for a digital camera is disclosed. The photographic lens has only two lens elements, yet provides excellent imaging even at the periphery of the image field. The photographic lens of the invention and an image sensor, together, fit within a volume of about 10 cm3 The lens is formed of, in order from the object side, a biconvex lens element having two aspherical surfaces, and a positive meniscus lens element having two aspherical surfaces. The convex surface of the meniscus lens element is positioned on the image side, and various conditions are satisfied in order to provide the photographic lens with a short overall length while favorably correcting various aberrations.

Abstract: An auxiliary imaging lens is attachable to the main part of zoom lens on the object side; and is configured such that, when capturing an image for a screen having an aspect ratio of 4:3, an effective imaging area having such a size that the screen having an aspect ratio of 4:3 in a case without using the auxiliary imaging lens is just held therein can be secured, and a focal length yielding a field of view area substantially on a par with a field of view area obtained when capturing an image for a screen having an aspect ratio of 16:9 can be set.

Abstract: A single focus lens formed of only two lens groups, both of positive refractive power, with each lens group being formed of only a single lens. The lens of the first lens group has at least one of its surfaces aspherical, and the lens element of the second lens group has at least one of its surfaces aspherical and is convex on the object side. In addition, the following conditions are satisfied in order to provide a single focus lens suitable for use in a highly portable, compact camera, such as a digital camera: &ugr;d2>50 |f/f1|<0.75 where &ugr;d2 is the Abbe number, at the d line, of the lens element that forms the second lens group, f is the focal length of the single focus lens, and f1 is the focal length of the lens that forms the first lens group.

Abstract: An optical magnification adjustment system being capable of minutely correcting magnification. A first lens 1 of plano-convex is installed on the side of an object surface 5, and a second lens 2 of concave-plano is installed on the side of a formed image surface 7. By controlling the center space d between the first lens and the second lens, the image is enlarged or reduced. The radii of curvature R2 and R3 of the convex surface of the first lens and the concave surface of the second lens are respectively set according to the following equations.

Abstract: An external pupil lens system (200) with an entrance pupil distance at least three times that of the effective focal length. The lens system is comprised of several conventional lenses and a diffractive optical element (DOE) for secondary chromatic aberration correction. In the illustrative embodiment, the system includes an entrance pupil (50), followed by a lens group (52) containing two refractive elements for primary color correction. Next along the optical axis is lens group (54), which contains two refractive elements for astigmatism and higher order coma correction, followed by lens group (60), which contains one refractive element (62) and one DOE (64) for secondary color correction.

Abstract: An acoustic lens having two or more regions, each region having a different acoustic index of refraction. The lens may have a simple, non-compound, surface in which both regions form different sections of the same convex or concave curve with the same functional dependence. The transition between the two regions may be gradual or abrupt. The attenuation and other characteristics of the lens may be tailored to provide apodisation and to filter out unwanted frequencies.

Abstract: A method of bonding substrates by hydroxide-catalyzed hydration/dehydration involves applying a bonding material to at least one surface to be bonded, and placing the at least one surface sufficiently close to another surface such that a bonding interface is formed between them. A bonding material of the invention comprises a source of hydroxide ions, and may optionally include a silicate component, a particulate filling material, and a property-modifying component. Bonding methods of the invention reliably and reproducibly provide bonds which are strong and precise, and which may be tailored according to a wide range of possible applications. Possible applications for bonding materials of the invention include: forming composite materials, coating substrates, forming laminate structures, assembly of precision optical components, and preparing objects of defined geometry and composition. Bonding materials and methods of preparing the same are also disclosed.

Abstract: A micro-optical beam steering angle magnifier, including an input light source (such as a laser), a double-convex input lens, and a double-convex output lens. The input light source emits an input light beam at a specified input angle with respect to the optical axis, toward the input lens. The input lens directs the input light beam to the output lens. The output lens outputs the light beam at an output angle of magnitude 5 times (but sign opposite) that of the input angle. Other types of lenses may be used with varying degrees of quality and maximum output angle. The invention may be used with beams that are collimated or aberrated.

Abstract: A single focus lens formed of only two lens groups, both of positive refractive power, with each lens group being formed of only a single lens. The lens of the first lens group has at least one of its surfaces aspherical, and the lens element of the second lens group has at least one of its surfaces aspherical and is convex on the object side.

Abstract: An endoscope objective optical system includes a negative first lens group, a positive second lens group, and an imaging device, in this order from the object.

Abstract: A portable TV telephone has an objective lens system configured to form an image of an object and an antenna configured to transmit and receive at least one of an image signal representing the image of the object, a dial signal and a voice signal carried by radio waves. A display unit is configured to display at least a dial number and the image of the object and a switch is configured to operate responsive to at least the dial number. The objective lens system includes a diffractive optical element configured to at least correct chromatic aberration produced by the objective lens system. The objective lens system includes, in order from an object side, a first negative lens unit and a second positive lens unit.

Abstract: A lens system has the first and second lens components from the object side. The first lens component has a negative optical power. The second lens component has a positive optical power. The lens system fulfills the conditions: 0.0<PRL/Y′<0.5, 0.5<Pf/f<1.0. In the conditions, PRL represents a distance in a direction perpendicular to the optical axis between the optical axis and an incident position where a lower ray of a most off-axial rays enters said second lens component, Y′ represents a largest image height, f represents a focal length of the entire lens system, and Pf represents a focal length of said second lens component.

Abstract: An observation optical system including an objective optical part which forms an image of an object, an image inverting part which converts an image formed by said objective optical part into an erect image, and an eyepiece optical part which guides the erect image converted by said image inverting part to an observer. The objective optical part has a first lens unit with a negative power and a second lens unit with a positive power arranged from an object side in the order named, and said second lens unit is movable in a direction including a component perpendicular to an optical axis to stabilize an image.

Abstract: A seal for a container opening includes a backing layer and a seal layer for connecting to and covering an opening of the container. A pull-tab forming layer is sandwiched between the backing layer and the seal layer. The pull-tab forming layer has a heat sealable surface joined to the backing layer. An opposite heat resistant surface is joined to the seal layer. A hinge is disposed near the center of the seal that joins the backing layer and the sealed layer wherein the backing layer and at least a portion of the pull-tab forming layer define a pair of pull-tabs extending from the hinge. A method of forming the seal including the pull-tab forming layer and a material blank for forming a plurality of the seals are also described.

Abstract: A projection lens including a first lens group, a diaphragm, and a second lens group, which are disposed in that order from a screen to an image source. The first lens group includes an aspherical lens and at least one positive lens, and has a positive refractive power. The second lens group includes at least one set of combined lenses and an aspherical lens, and has a positive refractive power. A lens gap in the first lens group is moved to perform a focusing operation. It is possible to provide a wide-angle projection lens which uses few lenses and has a long back focus and focal length when BF/F is greater than 1.87, and HF2/F2 is greater than 0.22 but less than 0.57, where F denotes the focal length of the projection lens, BF denotes the distance in air from a last lens surface of the second lens group to the image source, F2 denotes the focal length of the second lens group, and HF2 denotes the location of a front principal point of the second lens group.

Abstract: An objective lens for recording and/or reproducing an optical information recording medium, comprises a first lens having a positive refractive power; and a second lens having a positive refractive power; wherein the first lens and the second lens are aligned in this order from a light source side of the objective lens; first lens and the second lens are respectfully made of material having a specific gravity of 2.

Abstract: A teleconverter lens is disclosed, for attachment to the enlarging side of a projection lens, wherein aberrations generated by a negative focusing lens group positioned at the enlarging side of the projection lens are not made greater by the teleconverter lens. The teleconverter lens is substantially afocal and is formed of a front lens group having negative refractive power and a back lens group having positive refractive power. The front lens group is formed of two series of combined lenses, each combined lens being a lens element of positive refractive power and a lens element of negative refractive power that are joined. The back lens group is a single combined lens formed of a lens element of positive refractive power that is joined to a lens element of negative refractive power. The teleconverter lens is detachably attachable at its back side to the enlarging side of the projection lens.