Abstract: A variable magnification optical system for projection includes a first-lens-group having negative refractive power, and which is fixed when magnification of the system is changed, a second-lens-group having negative refractive power, and which is movable when magnification of the system is changed, a third-lens-group having positive refractive power, and which is movable when magnification of the system is changed, and a fourth-lens-group having positive refractive power, and which is fixed when magnification of the system is changed, which are arranged from the magnification side of the system in the order mentioned. The reduction side of the variable magnification optical system is telecentric, and formula 1.5<Bf/fw is satisfied, where Bf: back focus in air of entire system at wide angle end, and fw: focal length of entire system at wide angle end.

Abstract: A bi-telecentric interferometer continuous zoom imaging device, wherein a collimation object lens set, a telecentric imaging module, a telecentric continuous zoom module, and a CCD of modular design are formed on an integral circular tube main body, and can be calibrated and positioned separately. Then, a multi-partition isolation design is used to partition a housing into independent space for said various modules, to facilitate maintenance and also achieve customization. Collimation object lens set converts parallel light beams of interference pattern into a convergent light beam, and guides it to an imaging route through optical route adjusting means. Then, telecentric imaging module converts interference pattern on imaging route into an telecentric image parallel to optical axis, and telecentric continuous zoom module adjusts a magnifying ratio of telecentric image, then outputs an object image to form it on CCD, thus improving optical distortion and inferior resolution of the prior art.

Abstract: The present invention relates generally to a head-mounted projection display, and more particularly, but not exclusively to a polarized head-mounted projection display including a light engine and a compact, high-performance projection lens for use with reflective microdisplays.

Abstract: An optical cable including connectors includes a plurality of waveguide layers each including a plurality of optical channels each having a first end and a second end. First and second connectors each include a plurality of electrically conductive pins, and each of the plurality of optical channels of each of the waveguides, at their first and second ends, are connected to a specified pin on each of the first and second connectors, respectively. A first optical channel connection pattern on the first connector, and a second optical channel connection pattern on the second connector. The first optical channel connection pattern on the first connector is a different pattern than the second optical channel connection pattern on the second connector in relation to a connection hole pattern which is the same for both the first and second connectors.

Abstract: A bi-telecentric continuous zoom imaging device, comprising: a collimation object lens set, to convert parallel light beams of interference patterns into a convergent light beam, and to guide it onto an imaging route through optical route adjusting means. A telecentric imaging module converts interference pattern on imaging route into a telecentric image paralleling to an optical axis. Then, a bi-telecentric continuous zoom module adjusts a magnification ratio of telecentric image, and then outputs an object image. Finally, object image is formed on a charge coupled device (CCD). Through application of bi-telecentric continuous zoom imaging device, deficiency of conventional measurement system can be improved, even if the object distance is changed the magnification ratio of image can be kept, minimum optical distortion and good resolution can also be maintained.

Abstract: An imaging lens consists of a negative first lens having a concave object-side surface, a positive second lens, a negative third lens, a positive fourth lens having a convex object-side surface, and a positive fifth lens, which are in this order from an object side. A stop is arranged between an image-side surface of the first lens and an object-side surface of the third lens. When the focal length of an entire system is f, and the focal length of the first lens is f1, and the focal length of the second lens is f2, the following formula is satisfied: ?1.30<f1/f2?0.65??(7).

Abstract: Scanning optical beam imaging systems for imaging a surface with convex curvature are provided. The systems include a sphero-telecentric objective, wherein a scanning radius of curvature of the sphero-telecentric objective is greater than an apical radius of curvature of the surface and less than or equal to four times an apical radius of curvature of the surface.

Abstract: The present disclosure provides a telecentric optical assembly comprising a first portion of a telecentric optical link including a first kinematic mount having alignment structures, where the first kinematic mount can be attached to a first substrate having a first array of active optical elements; and a second portion of the telecentric optical link 202 including a second kinematic mount having recesses configured to mate with the alignment structures, where the second kinematic mount can be attached to a second substrate having a second array of active optical elements. Additionally, the first and second kinematic mounts, when mated, can align optical beams between the first array of active optical elements and the second array of active optical elements.

Abstract: A compact, lens suitable for airborne photography and mapping has distortion less than 0.6% and is athermal from ?15° C. to +40° C. The lens is near-telecentric to less than 11°, apochromatic over the wavelength range 450 nm-650 nm, and has a full field of view of 60° (high quality field over 53°). The lens can be secondary color corrected. In embodiments, the focal length is 101 mm and the back working distance is more than 10 mm. Embodiments have a focal plane diameter of 104 mm and are compatible for use with a CMOS 1.8 gigapixel multiple FPA. In embodiments, the lens comprises three groups of optical elements, with an aperture located within the second optical group. In some embodiments the first group includes two elements, the second group includes six or seven elements, and the third group include three elements. In embodiments the lens (without window) is less than 180 mm long.

Abstract: A low cost and lightweight interchangeable lens system is provided. The lens system includes two aspheric elements that is usable both for page-based and bit-based data storage systems. The lens system has a large field of view up to ±50 degrees and a high numerical aperture up to 0.8. The invention reduces cost and weight of the objective lenses and is usable with the servoing technology. The invention provides a long working distance of 20% of the focal length and provides sufficient physical space to accommodate media and aberration corrections, which enable a media interchangeable and compatible system among the both optical recording formats.

Abstract: In a projector lens system including at least three lens elements and telecentric on a side of an optical modulator, two of the lens elements located on outer most ends of the projector lens system facing conjugate points of the projector lens system consist of plastic lenses, and an aperture stop of the projector lens system is located between the two outer most lens elements while at least one of the lens elements other than the two outer most lens elements most adjacent to the aperture stop consists of a glass lens. Thereby, the cost and weight of the projector lens system can be reduced while achieving the required optical properties.

Abstract: An optical coupling system includes a first unit including a source of light or a first multi-core optical fiber, each of the source and the first multi-core optical fiber including at least a first aperture, a second unit including a second multi-core optical fiber including at least a second aperture corresponding to the first aperture of the first unit, and a lens array unit redirecting light between the first unit and the second unit, the lens array unit substantially matching light rays transmitted or received between the first aperture of the first unit and the corresponding second aperture of the second unit.

Abstract: A variable view imaging system for observation of micro object with variable view orientation and position includes a telecentric lens group, a scanning mirror, wedge prisms, a deformable mirror and related optical elements. The combination of a scanning mirror and a telecentric lens group decouples the motion of scanning mirror and the view angle. The view angle is determined only by the angle of the wedge prisms. This design increases the zenith angle of the view and simplifies the kinematics of the system. The wedge prisms and the scanning mirror can supply a flexible view in a compact way. The wavefront error induced by the wedge prisms is corrected by the deformable mirror. In order to achieve the desired view state during operation, the scanning mirror angle and the wedge prisms angle are calculated iteratively based on the kinematics and Jacobian matrix of system.

Abstract: The projection optical system uses a plurality of wavelengths or a wavelength band within a wavelength range from a visible region to a near ultraviolet region. The double-telecentric projection optical system includes: a first lens group with a positive power; a second lens group with a negative power, including a predetermined lens or lenses; and a third lens group with a positive power, including a stop and at least two positive lenses satisfying a predetermined condition relating to refractive index. The projection optical system satisfies a predetermined condition relating to a composite focal length of the first lens group and the second lens group, and a focal length of the third lens group.

Abstract: A projection lens system includes, in order from the magnification side, a negative first lens group and a positive second lens group, and is telecentric on the reduction side. The first lens group includes a first lens formed as an aspheric lens which is disposed closest to the magnification side. The second lens group includes a second lens formed as a positive lens, in or near which an aperture diaphragm is disposed, disposed closest to the magnification side, and an aspheric lens. Between the aperture diaphragm and the aspheric lens of the second lens group, two or more negative lenses and two or more cemented surfaces are disposed. And, 0.10<f/f2-1<0.30, and N2-1>1.75 are satisfied. Here, f denotes a focal length of the whole system, f2-1 denotes a focal length of the second lens, and N2-1 is a refractive index of the second lens at the d-line.

Abstract: A telecentric lens optical system includes: a front lens group; a rear lens group having a front focal point coinciding with a rear focal point of the front lens unit; and diaphragm mechanisms, each of which is disposed at a position where the rear focal point of the front lens unit and the front focal point of the rear lens unit coincide with each other. One of the front lens group and the rear lens group is provided by a plurality of variable magnification lens groups. The diaphragm mechanisms are provided corresponding to the variable magnification lens groups, respectively. A magnification switching mechanism is provided to selectively move a pair of one of the variable lens groups and one of the corresponding diaphragm mechanisms to be disposed on an optical axis of the other of the front lens group and the rear lens group.

Abstract: In a lithographic projection system, a corrective optic in the form of one or more deformable plates is mounted within telecentric image or object space for making one-dimensional or two-dimensional adjustments to magnification. The deformable plate, which can be initially bent under the influence of a preload, contributes weak magnification power that influences the magnification of the projection system by changing the effective focal length in object or image space. An actuator adjusts the amount of curvature through which the deformable plate is bent for regulating the amount of magnification imparted by the deformable plate.

Abstract: An optical assembly uses a plastic prism with one flat surface and a collimating lens optic to provide the capability of imaging a color micro-display to the eye. The collimating optic and flat prism surface can allow for aberration-free diopter adjustment and an image with very low-magnitude, nearly-symmetric distortion. The collimating optic can also provide environmental protection of the prism involving an optical plastic device. The input illumination from the micro-display enters the prism, is reflected two times within the prism, exits the prism, and passes through the collimating optic before being viewed by the eye. Such an optical assembly can provide a field of view with eye-relief and exit pupil when viewing a full-color micro-display.

Abstract: In a projection optical system for use in an image projection apparatus illuminating an image display panel forming an image in accordance with a modulating signal with illumination light from a light source, the projection optical system includes first and second optical systems arranged along an optical path defining an upstream-downstream direction in the order described from upstream to downstream on the downstream side of the image display panel. The first optical system includes at least one dioptric system and has positive power. The second optical system includes at least one reflecting surface having power and has positive power. The image formed by the image display panel is formed as an intermediate image in the optical path, and the intermediate image is magnified and projected.

Abstract: This high performance front objective lens system intended primarily for use with a video inspection apparatus has a first lens set in the form of a doublet, with a second lens set intermediate the first lens set and the imaging plane. The second lens set includes a doublet and an adjacent lens. The overall system has an effective focal length of 50 mm, a front focal length of 38.75 mm, and a numerical aperture greater than 0.2. Further, the material of the doublets is chosen to have a small, gradual transition in index between the elements of the lens and the cement, minimizing back reflections and thereby eliminating the need for index matching coatings on the cemented surfaces of the doublets. Finally, the imaging plane of the system matches that of standard ring lights used with video inspection apparatus.

Abstract: The present invention relates generally to a head-mounted projection display, and more particularly, but not exclusively to a polarized head-mounted projection display including a light engine and a compact, high-performance projection lens for use with reflective microdisplays.

Abstract: The projection optical system uses a plurality of wavelengths or a wavelength band within a wavelength range from a visible region to a near ultraviolet region. The double-telecentric projection optical system includes: a first lens group with a positive power; a second lens group with a negative power, including a predetermined lens or lenses; and a third lens group with a positive power, including a stop and at least two positive lenses satisfying a predetermined condition relating to refractive index. The projection optical system satisfies a predetermined condition relating to a composite focal length of the first lens group and the second lens group, and a focal length of the third lens group.

Abstract: The present invention provides an imaging lens assembly including, in order from an object side to an image side: a first lens element with positive refractive power having a convex object-side surface; a second lens element with negative refractive power; a third lens element with negative refractive power; a fourth lens element with positive refractive power having a convex object-side surface; a fifth lens element having a concave image-side surface, at least one inflection point being provided on the fifth lens element; and an aperture stop disposed between an imaged object and the third lens element. Such an arrangement of optical elements can effectively improve the image quality of the system and enable the imaging lens assembly to maintain a compact form. When the aperture stop is disposed near the object side, the telecentric feature is emphasized, resulting in a shorter total track length.

Abstract: Disclosed is an optical head apparatus comprising: a light source; a collimating means of converting a beam of light emitted from the light source into a substantially parallel beam of light; a focusing means of focusing the light onto an information medium surface; a beam splitting means of splitting the beam of light modulated by the information medium; and a light receiving means of receiving the light modulated by the information medium, wherein a lens having a negative power and a lens having a positive power are arranged in this order as viewed from the collimating means side between the collimating means and the focusing means, and at least either one of the lenses is moved along an optical axis to correct spherical aberration occurring on the information medium surface, and wherein the distance from the lens having the positive power to the focusing means is set substantially equal to the focal length of the lens having the positive power.

Abstract: Disclosed are a projection lens that is faster than F1.95 and has a simple inner focus structure, a high optical performance, and a small size, and a projection display device. A projection lens includes a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having a positive refractive power arranged in this order from a magnification side. A fifth lens arranged closest to a reduction side in the first lens group is moved along an optical axis to adjust focus. The projection lens satisfies the following conditional expression: 0.2<DG12/f<0.8 where DG12 indicates a distance between the first lens group and the second lens group and f indicates the focal length of the entire lens system.

Abstract: A non-linear modification to telecentric object space together with alteration of working distance provides a distortion adjustment feature. The modification to telecentric object space can be manifest as a spherical aberration in an entrance pupil. The change in working distance can be made by relatively translating the imaged object through the modified telecentric object space. The distortion adjustment can be made to compensate for distortions accompanying changes in ambient or operating conditions. Distortions accompanying magnification corrections can also be corrected.

Abstract: A telecentricity corrector is incorporated into a microlithographic projection system to achieve telecentricity targets at the output of the microlithographic projection system. The telecentricity corrector is located between an illuminator and a projection lens of the projection system, preferably just in advance of a reticle for controlling angular distributions of light illuminating the reticle.

Abstract: An optical lens system includes a lens surface capable of forming concentric interference patterns on an object as if light emitted from a single light source were virtually emitted from two or more light sources within a plane containing an optical axis of the single light source.

Abstract: A three-dimensional imaging apparatus for imaging a three-dimensional object may include a microlens array, a sensor device, and a telecentric relay system positioned between the microlens array and the sensor device. A telecentric relay system may include a field lens and a macro objective that may include a macro lens and an aperture stop. A method of imaging a three-dimensional object may include providing a three-dimensional imaging apparatus including a microlens array, a sensor device, and a telecentric relay system positioned between the microlens array and the sensor device; and generating a plurality of elemental images on the sensor device, wherein each of the plurality of elemental images has a different perspective of the three-dimensional object.

Abstract: A lens system with a first group having a positive meniscus lens and a sensor. The optical distance between the front surface of the first group and the sensor can be not greater than the height of the sensor times the image F-number, which may alternatively be referred to as the image F-number. A second group can be disposed adjacent to the front focal point of the first group, and a lens-stop can be disposed adjacent to the second group. A third group can be disposed midway between the lens-stop and the object field of the first and second groups. The image F-number can be 2.8 or greater. The first group can have a doublet formed by a first lens that is plano convex and a second lens that is plano concave. The second group can have a first, plano convex lens and a second, biconvex lens forming a doublet with a third, plano concave lens.

Abstract: There is provided an optical device, comprising a display source; a light-diffuser; an imaging optical module, and an output aperture from the optical device characterized in that the light diffuser is an angular, non-uniform diffuser of light for increasing a portion of light emerging from the display source that passes through the output aperture. A method for improving the brightness of an optical display is also provided.

Abstract: A non-linear modification to telecentric object space together with alteration of working distance provides a distortion adjustment feature. The modification to telecentric object space can be manifest as a spherical aberration in an entrance pupil. The change in working distance can be made by relatively translating the imaged object through the modified telecentric object space. The distortion adjustment can be made to compensate for distortions accompanying changes in ambient or operating conditions. Distortions accompanying magnification corrections can also be corrected.

Abstract: The present invention provides: a lens optical system having a lens and a plastic block having two parallel planes, the plastic block being provided between the lens and a focal position of the lens to suppress a variation of a focal length due to a temperature change, and a photoelectric encoder including the lens optical system.

Abstract: A telecentric lens optical system includes: a front lens group; a rear lens group having a front focal point coinciding with a rear focal point of the front lens unit; and diaphragm mechanisms, each of which is disposed at a position where the rear focal point of the front lens unit and the front focal point of the rear lens unit coincide with each other. One of the front lens group and the rear lens group is provided by a plurality of variable magnification lens groups. The diaphragm mechanisms are provided corresponding to the variable magnification lens groups, respectively. A magnification switching mechanism is provided to selectively move a pair of one of the variable lens groups and one of the corresponding diaphragm mechanisms to be disposed on an optical axis of the other of the front lens group and the rear lens group.

Abstract: The invention generally relates to a compact, inexpensive-to-manufacture, device of few components for optically inspecting a surface and a method for same employing the device. The section of the surface to be investigated is illuminated by a semitransparent mirror and a field lens, employing a telecentric beam path, and at least part of the light reflected or scattered by the surface is imaged onto the entrance pupil of the optics of an electronic camera by the field lens, via the semitransparent mirror. All optical and electronic components, along with a light- and dust-tight housing, are carried on a specially configured mounting block such that they are self-aligning. The method for inspecting a surface involves automatically recording a series of images of the surface under various types of illumination situations. Those images are assembled into an image of the entire section of the surface to be investigated and analyzed using known image-processing methods.

Abstract: A photoelectric encoder has a telecentric optical system in which a first lens and an aperture located at a focal position of the first lens are interposed between a main scale and a photoreceptor. At least a second lens is interposed between the aperture and the photoreceptor with a focus of the second lens on the aperture, thereby constituting a bilateral telecentric optical system. This makes it possible to improve the signal detection efficiency and increase the assembly tolerance.

Abstract: A device comprises an imaging device, a placement element connected to the imaging device for placing a component on a substrate, as well as an optical system having an optical axis. The placement element and the imaging device can be jointly moved relative to the optical system to at least a position in which the optical axis is located between the imaging device and the placement element, wherein the position of a component supported by the placement element can be detected by means of the imaging device. The optical system is telecentric at least in an image space located near the imaging device as well as in an object space located near the placement element.

Abstract: A fixed-focus lens including a first lens group, a second lens group and a third lens group which are arranged in sequence from an object side to an image side is provided. The first lens group has a negative refractive power and includes a first lens and a second lens arranged in sequence from the object side to the image side, and both having negative refractive powers. The first lens is an aspheric lens. The second lens group has a positive refractive power and includes a lens with positive refractive power. The third lens group has a positive refractive power and includes at least one first cemented lens. The fixed-focus lens satisfies 1.2<|fG1/f|<4.2 and 2.8<|fL2/f|<8.6, where f, fG1 and fL2 are effective focal lengths of the fixed-focus lens, the first lens group and the second lens respectively.

Abstract: A projection lens includes, in order form a magnification side: a first lens group having negative refractive power; and a second lens group having positive refractive power. An aspheric lens is arranged on the most magnification side of the first lens group. The conditional expressions 3<Bf/f and 0.4<H/L are satisfied, where f denotes a focal length of the projection lens, Bf denotes an air-converted back focal length, H denotes a height of a principal ray at the maximum angle of view on a plane which is orthogonal to an optical axis and which passes through point A, and L denotes a length from the point A to a vertex of a lens surface on the most reduction side on the optical axis. Here, the point A is a vertex of a lens surface on the most magnification side on the optical axis.

Abstract: An illuminator with substantially reduced telecentricity error relative to conventional illuminators includes one or more modules having movable optical elements with low telecentricity error that may be adjusted to compensate for telecentricity errors. The modules may include a zoom zoom axicon, a condenser, and a multi field relay. The zoom zoom axicon may include one or more lenses adjustable in up to six degrees of freedom. The condenser and the multi field relay may include one or more lenses adjustable in up to six degrees of freedom or a set of two or more mirrors with one or more of the mirrors adjustable in up to six degrees of freedom. The illuminator may also include a control system to control the adjustments of the movable optical elements. A lithography system including such an illuminator is also presented, along with a method of providing illumination with low telecentricity error.

Abstract: An optical lens system includes a lens surface capable of forming concentric interference patterns on an object as if light emitted from a single light source were virtually emitted from two or more light sources within a plane containing an optical axis of the single light source.

Abstract: A projection optical system for use in an image projection apparatus illuminating a light valve forming an image in accordance with a modulating signal with illumination light from a light source. The projection optical system includes first and second optical systems arranged along an optical path defining an upstream-downstream direction in the order described from upstream to downstream on the downstream side of the light valve. The first optical system includes at least one dioptric system and has positive power. The second optical system includes at least one reflecting surface having power and has positive power. The image formed by the light valve is formed as an intermediate image in the optical path, and the intermediate image is magnified and projected.

Abstract: An optical device for a wavelength division multiplexing system has a telecentric lens system and a signal-processing optical element, where the signal-processing optical element performs switching, attenuation, or other optical signal processing for the optical device. The telecentric lens system acts as a self-compensating optical system to minimize sensitivity of the optical device to unwanted displacement of an input image from the optical axis of the optical device. The optical device may include multiple telecentric lens systems, in which case the optical device is also less sensitive to precise alignment between the telecentric lens systems.

Abstract: Aspects of the invention can provide an image display device for modulating light from a light source on the basis of display image data to display an image. The image display device can include a first optically modulating device for modulating light from the light source, a second optically modulating device for modulating light from the first optically modulating device, a relay lens system provided between the first optically modulating device and the second optically modulating device for forming an optical image of the first optically modulating device on a light-receiving surface of the second optically modulating device, and at least one reflecting optical device provided between plural lenses forming the relay lens system.

Abstract: A two-dimensional light-modulating fine aperture array apparatus includes a spatial light-modulating unit for adjusting quantity of incident light by using a plurality of light amount adjusting cells (liquid crystal cells or micromirrors) arrayed in matrix form, a two-dimensional microlens array having microlenses which focus light beams passing through the light quantity adjusting cells, and a highly efficient two-dimensional fine aperture array. The light is emitted through the fine apertures by connecting the two-dimensional light-modulating fine aperture array apparatus with a light source unit. A scanning unit moves in the x and y directions to perform a scanning process on a surface of a recording medium by using the light emitted from the apertures.

Abstract: A device comprises an imaging device, a placement element connected to the imaging device for placing a component on a substrate, as well as an optical system having an optical axis. The placement element and the imaging device can be jointly moved relative to the optical system to at least a position in which the optical axis is located between the imaging device and the placement element, wherein the position of a component supported by the placement element can be detected by means of the imaging device. The optical system is telecentric at least in an image space located near the imaging device as well as in an object space located near the placement element.

Abstract: An image reading lens is provided and includes: first, second and third lens groups arranged on the object side with respect to the aperture stop; and fourth, fifth and sixth lens groups arranged on the image side. At least all positive lenses, in each lens group, satisfy conditional expression (1) below. At least two positive lenses of the first to third lens groups and at least two positive lens of the fourth to sixth lens groups satisfy the conditional expression (2) below. In the conditional expressions, vd represents Abbe number at the d-line, and ??g,d represents abnormal dispersion. vd>60.0 ??(1) ??g,d>0.

Abstract: In one aspect, the invention relates to an optical apparatus for producing light of a predetermined intensity from light sources of less than the predetermined intensity. In one embodiment the apparatus includes a first light source; a second light source; a double dove anti-Gaussian generator in optical communication with the first light source; and a compensator in optical communication with the second light source. Light from the first light source passes through the double dove anti-Gaussian generator and light from the second light source passes through the compensator, and are combined to produce a flattened Gaussian intensity distribution. In another aspect, the invention relates to a method and apparatus for separating an image into subunits and reading the separate subimages out of the detectors in parallel.

Abstract: A lens system for use in a two-stage projection system that relays light output from a first imager on a pixel-by-pixel basis onto a second imager (e.g. an LCOS). The lens system includes a double gauss lens set having a distortion of less than about 0.015% with at least about 90% of the light energy of a specific pixel projected within about a 15.4 micrometer square. Thus a projection system that enhances the contrast ratio for video images, particularly in the dark state, and reduces contouring artifacts, can be achieved.

Abstract: A projection optical unit for enlarged projection of an image displayed by an image display element includes a first projection optical unit having positive refractive power, and a second projection optical unit having positive refractive power for further enlarging the first enlarged image obtained by the first projection optical unit. The first projection optical unit is in an almost telecentric relationship with respect to the image display element side and the first enlarged image side, and the first enlarged image is formed at the image display element side, rather than at the second projection optical unit.