Abstract:
In an embodiment, a low height imaging system has: one or more optical channels and a detector array, each of the optical channels (a) associated with at least one detector of the array, (b) having one or more optical components and a restrictive ray corrector, and (c) configured to direct steeper incident angle field rays onto the at least one detector.
Abstract:
A lens assembly is constructed to accommodate certain, often competing, design characteristics. The lens assembly provides high optical performance in a compact and easy to manufacture system. The lens assembly allows a manufacturer to produce a system that is common among various aperture sizes so that manufacturability is enhanced. The lens assembly is also suitable for use in connection with additional components, such as filters and/or electronic detectors, such as CCD's and/or CMOS's. The lens assembly may be arranged to provide a relatively wide angle, such as approximately 40 degrees, with minimal distortion, for example, less than 1 % a ratio of the length of the lens assembly to the back focal length of approximately 1.39 to accommodate additional components, such as optical filters. The lens assembly may be configured as a four group, six element, lens assembly. The lens assembly may contain compensating aberrations to compensate the aberrations of plane parallel plates that may be used in connection with the lens assembly.
Abstract:
A projection lens system which includes a telecentric lens assembly. The lens may be used to form an image from a light source, including for example a resonant microcavity phosphor or cathode ray tube, onto a screen or display, such as in a television or a projection device. In accordance with one embodiment, a planar cooling gap or cavity (which may or may not contain a cooling liquid) is included between the imaging surface and the matching planar surface of the field lens. The use of a planar gap alleviates any temperature differentials across the cooling liquid and the lens surfaces, as compared with alternate designs that may have a non-planar gap between the faceplate and the field lens, or that use liquid lenses.
Abstract:
The invention presents a wide-angle imaging assembly which comprises a main lens produced from an aspheric optical block. The aspheric optical block comprises a vertical axis of symmetry; a transparent upper surface, at least part of which is capable of reflecting rays that impinge upon it from the interior of the optical block; a transparent perimeter surface; and a transparent lower surface. The optical block is fabricated from material selected to enable optical transmittance of a specific spectral range. Light rays in the specific spectral range originating in a first scene, having a 360 degrees panoramic perimeter, are refracted by the transparent perimeter surface, enter the optical block, are then reflected by the upper surface towards the transparent lower surface, where they are then refracted by the transparent lower surface, and exit through it.
Abstract:
A catadioptric system comprising a first image-forming optical system having at least 2 reflecting mirrors and adapted to form a first intermediate image of a first surface on the basis of light from the first surface, a second image-forming optical system having at least 2 reflecting mirrors and adapted to form a second intermediate image of the first surface on the basis of light through the first image-forming optical system, and a dioptric type third image-forming optical system adapted to form the final image of the first surface on a second surface on the basis of light through the second image-forming optical system, wherein all optical components that constitute the first, second and third image-forming optical systems are arranged along a single straight optical axis.
Abstract:
A compact and high-performance projection optical system which can correct aberrations very satisfactorily while attaining an image side telecentricity over the whole exposure region and securing a sufficiently large numerical aperture (NA) and a wide exposure region and an aligner comprising the optical system. The projection optical system (PL) projects the image of a reticle (R) illuminated by an illumination optical apparatus (IS) onto a wafer (W). The projection optical system (PL) has NA-determining aperture diaphragms (AS1, AS2) at positions close to the pupil position in the optical system, and the aperture diaphragms (AS1, AS2) are so disposed as to become telecentric on the wafer (W) side. At least one of the aperture diaphragms (AS1, AS2) can change the size of its aperture and can move in the axial direction.
Abstract:
An apparatus for projecting images (100, 200, 300, 400) onto a projection screen is disclosed. The apparatus incorporates novel features to reduce both cost and size while providing a high level of illumination uniformity at the projection surface (308). Specifically, the apparatus uses an illumination focusing group (104, 210, 220, 222) for providing a uniform level of light on the image (106) to be projected. The illumination focusing group (104, 210, 220, 222) is designed to make use of lenses unsuitable for use as projection lenses (108, 110, 220, 222), thus reducing scrap and the attendant cost thereof.
Abstract:
An optical system (10) for computing a height of a target (22) on a surface includes a light projector (30) for projecting light. The light passes through a patterned reticle (32) and a projector lens (34) so as to illuminate the target (22) with an image of the pattern. The light is projected telecentrically between the reticle (32) and the projector lens (30), and a camera (42) is positioned along a receive optical path. The camera (42) receives an image of the target (22) through a receive lens (40). The target (22) and the pattern move at least three times with respect to each other, and the camera (42) acquires an image of the target (22) at each of at least three positions.
Abstract:
A camera with an objective and a sensor serving as an optoelectronic transducer is known in prior art. Said camera can be used, for instance, to monitor traffic in a vehicle or to assist during reverse driving. Conventional CCD sensors have limited brightness dynamics thus making it necessary to provide a controllable diaphragm or a brightness control device for the objective. Novel semiconductor sensors have substantially higher brightness dynamics in the range of 120 dB and can utilize all brightness values occurring in practice without a controllable diaphragm. In a camera having no controllable diaphragm, the entire amount of light always hits the objective. In the presence of intensive brightness, this causes considerable scatterings and reflections and ghost images in the resulting picture. The invention aims at making it possible to achieve practically no disturbing reflections even when no controllable diaphragms are used. This is achieved by combining a sensor (5) having a non-linear conversion characteristic curve (W) and high brightness dynamics and an objective having means for reducing reflections and scattered light. Said means consist, for instance, of an optical gel (8) mounted between the components of the objective or a special configuration of the lens (2, 3) and/or the holder (1) receiving the lens.
Abstract:
An optical system for illuminating a display device by providing substantially telecentric illumination at a display surface of the display device. In one embodiment, a first lens having a first focal length (f1) and a second lens having a second focal length (f2) are separated by a distance of approximately f1 + f2. The first lens receives light from a light source which provides light at a plurality of points of a surface of said light source; at each point, light is emitted in a predetermined pyramidal-like shape which has an axis and which defines an angle. The second lens, which is optically coupled to the first lens, provides light to the display device, which has a light modulating surface. A plurality of points at the light modulating surface receive a plurality of predetermined pyramidal-like shapes of light which are aligned to be parallel.