Abstract: A catadioptric one-to-one optical relay system which is telecentric in both object and image space. The system includes three modules, which include a spherical primary mirror, a spherical secondary mirror with a zero power doublet for axial color correction, and an X-prism for spectral division. The chromatic aberration generated by the X-prism is compensated by the zero power doublet corrector. Because the system is telecentric in both object and image space, the coatings associated with the X-prism are simplified. The system can be used in telescopes, optical systems with sensor protection, and color CCD assemblies.

Abstract: Diffractive optical elements (DOEs) consisting of a sandwich of two materials are described with an interfacial surface whose relief height impresses the desired optical phase. The two materials have nearly matched indices of refraction, so the interfacial surface has a profile that varies by many wavelengths and is easily fabricated. The materials are chosen such that the refractive index difference and dispersion obey a matching condition that renders the optical path difference (OPD) across the element constant across a broad band of wavelengths. This achromatizes the DOE in that the diffraction efficiency is independent of wavelength. This achromatic property and the fabrication ease allowed by the nearly index matched (NIM) materials enables hybrid refractive-diffractive elements to be fabricated by molding processes for broadband applications.

Abstract: The invention is directed to a stereoscopic endoscope wherein an intermediate image is generated in a rod-shaped endoscope attachment. The intermediate image is imaged into the focal plane of an objective. The objective can be the main objective of a surgical microscope with the objective having a long focal length or the main objective of a stereoscopic recording system. The main objective and an in-coupling optic conjointly define an inverted telescope.

Abstract: A reflecting mirror, wherein mirror segments are fused together thereby composing the reflecting mirror by formulating square sums of displacements at a plurality of sampling points on a mirror surface of the reflecting mirror as a function of a thermal expansion coefficient vector having components of deviations of thermal expansion coefficients of the respective mirror segments from the average thermal expansion coefficients of all the mirror segments, positions of the components corresponding to arranging positions of the respective mirror segments; generating a stochastic process wherein the smaller the square sum of the displacement of the thermal expansion coefficient vector, the larger the probability whereby the thermal expansion coefficient vector appears, by a computer using random numbers; selecting the thermal expansion coefficient vector minimizing the square sum of the displacement from the appeared thermal expansion coefficient vectors; and arranging and fusing together the mirror segments in a

Abstract: A method and apparatus for preventing undesirable index finger rotational motion within a non-invasive quantitative blood analyte measurement instrument includes placing at least the middle finger or the thumb into proper alignment with the index finger when inserted in the instrument to prevent the index finger from rotating with respect to the instrument's optical axis. The natural pincer-type relationship of the thumb and index finger is used to align the index finger in the optical axis by the positioning of the thumb and the positioning of the middle finger is used to hinder the rotation of the finger toward the thumb away from the optical axis. Conductive material is provided in grooves formed on the instrument housing to dissipate EMI energy from the test subject.

Abstract: A flying head slider with plural inclined planes tapered along the flowing direction of the air to a clearance between a disk and the slider to avoid the influence on the flying characteristic by the foreign material adhered thereto in touch with the disk. A flying head slider with tapered portions each provided at each widthwise end and an inclined plane provided therebetween to narrow the width of the tapered portions for separating the centers of the dynamic pressure by the flowing air as far as possible in the widthwise direction thereby to stabilize the rolling of the slider.

Abstract: A method for isolating an ion in a QIT (1) employing values from a mass axis calibration chart to establish the maximum DAC value to scan to in order to scan out m(p)-1 and less during ramp up of RF trapping field while applying a specifically selected fixed supplemental frequency applied during said calibration; and employing values from the calibration curve to establish the DAC value to scan out m(p)+1 and greater during ramping down of RF trapping field, while applying a previously determined fixed broadband spectrum to the QIT end caps.

Abstract: Eyeglasses of the type which permit interchanging of framed lenses are disclosed which employ a lens assembly including a pair of lenses mounted in a frame. The frame, in turn, is releasably mounted to a backing support which supports the upper portion of the frame and includes a retaining clip pivotally mounted between an open position permitting easy mounting of the lens assembly, and a second closed position which maintains engagement between the lens and backing assemblies.

Abstract: A spectacle for promoting even sight strength in the two eyes comprises a frame, two viewing lenses and a rectangular plate attachment to the frame. The rectangular plate has a bar and a ball affixed to the bar, mounted within a socket located in the frame which can deflect the rectangular plate toward the left lens or the right lens.

Abstract: Described herein is a variable magnification duplicator lens system which is provided with, on the subject side of a stop, a front lens group including a 1st lens element consisting of a meniscus lens of positive power and facing the convex side thereof toward the subject, a 2nd lens element consisting of a meniscus lens of negative power facing the convex side thereof toward the subject, a 3rd lens element with positive power, and a 4th lens element with negative power, and on the image-forming side of the stop, a rear lens group including 5th, 6th, 7th, and 8th lens elements arranged symmetrically with the 1st to 4th lens elements of the front lens group, respectively. Of these lens elements, the 3rd to 6th lens elements and at least one of the 1st and 8th lens elements are movable.

Abstract: An illuminating system of an ophthalmological instrument has a coaxial illuminating system for effecting a coaxial illumination by projecting an observation-use illuminating light toward an eye to be tested from a direction generally parallel with an optical axis of through an objective lens of an observing optical system, FIGS. 1A and 1B each illustrated an oblique illuminating system branched from the coaxial illuminating system and adapted to effect an oblique illumination by projecting the observation-use illuminating light toward the eye from an oblique direction different from the coaxial illumination, and an optical path switching optical member disposed in an intermediate part of an optical path of the coaxial illuminating system and adapted to switch the coaxial illumination to the oblique illumination or vice versa.

Abstract: Eyeglasses with a releasable support headband arrangement including a frame provided at each side with an integral connector member extending therefrom. An attachment member adapted for releasable securement to each connector member is releasably securable to each end of a stretchable headband, the headband supporting the eyeglasses on the wearer's head.

Abstract: The invention relates to an optical, spectacle-type device for aiding the sight of persons who have serious vision deficiencies. The novel device makes it possible for such persons to focus at close-up, as well as at remote objects. The device comprises a spectacle frame (carrier-frame), provided with either neutral or optical lenses, in front of which (or attached to which) there is provided one or two telescopic lens-systems, there being provided a frame bearing a corrective lens or pair of lenses which can be moved so as to be in front of said telescopic lenses or removed from such position, said additional lenses changing the focal length of the entire system.

Abstract: An illumination optical system for endoscopes wherein, in order to make it possible to make an illumination of a uniform and sufficient brightness over a wide range of the surface of an object to be observed, a cover lens arranged in front of the exit end face of a light guide is so formed that its surface on the object side may be a convex aspherical surface or may be a convex spherical surface or may have a concave center part and larger in the refractive index in the peripheral part than in the center part. The light guide may be a light emitting device.

Abstract: A foveal vision evaluation instrument and procedure enables a precise evaluation of the visual function of the fovea centralis (macula) area of the retina. A foveal profile is developed to document the presence and state of foveal degeneration manifested by foveal segmentation and incremental changes and abnormalities in foveal vision, such as are caused by age related macular degeneration.Beam source optics 10, beam polarization optics 20 and image selection system 30 provide a polarized projection beam PPB that transmits an image array obtained by directing one component of polarized projection beam PPB through an image transparency IT. Image element blanking optics 40 enables the individual elements of the image array to be selectively blanked using a multi-cell electro-optic shutter 45.

Abstract: The present invention relates to an apparatus which attaches to a conventional slit lamp instrument and measures any portion of an eye which can be visualized using the slit lamp instrument. The apparatus includes a device for detecting movement of the slit lamp instrument, a calculating device which calculates distances measured in the eye in dependence upon the movement of the slit lamp instrument, and an output device for outputting the distance measured.

Abstract: The inner sides of left and right lens rims constituting the main body of a frame for multifocal spectacles are provided with respective guide portions extending downwardly from a bridge connecting the rims together. Left and right nose-pads of a nose-pad member are secured in the guide portions under tension using left and right resilient pieces configured to gradually curve away from each other. This makes it possible to move the nose-pads up and down smoothly and reliably.

Abstract: A spectalce frame (10) comprises three assemblies; a lens frame assembly (11), a nose piece assembly (12) and an accessory (13), the lens frame assembly comprising a pair of lens frames connected by a frame bridge (24), the accessory comprising an accessory frame (14) which includes an accessory bridge (16), and the nose piece assembly having mounting means (18) thereon which includes a hinge carried by the bridge (21) of the nose piece assembly, which hinge supports the accessory bridge so that the accessory can be in the line of vision or retracted upwardly therefrom, the mounting means also comprising engagement means (22) which can releasably engage the lens frame (23), so that the lens frame can be snapped into or out of position on the nose piece assembly.

Abstract: An eyeglass assembly includes a pair of lenses with surrounding lens frames interconnected by bridges joining the lens frames together and cooperating therewith to form an opening for receiving a portion of the wearer's nose. Support means are provided on each lens frame below the bridge for engaging the wearer's nose for additional support. The nose supports include first and second legs formed from a unitary strip of resilient material bent at its mid-portion so that the two legs extend in generally the same direction from an intermediate fold portion. The two legs are resiliently movable toward and away from each other, and a first leg is joined to the lens frame so as to be resiliently movable with respect thereto. The legs may extend in generally upward or downward directions, that is, generally toward and away from the bridge member. The second legs are located adjacent the nose-receiving opening and carry nose-engaging surfaces.

Abstract: A lens system for a projection type television, having high focusing performance, a wide field angle and a reduced size. The lens system is composed of seven lenses, which are arranged successively from the screen side. The first lens, which is concave, and the second lens, which is convex, are cemented together to correct chromatic aberration. The third lens is a plastic lens for the correction of spherical aberration and astigmatism, at least one side of which is aspherical. The fourth lens, which is convex, and the fifth lens, which is concave, are cemented together to constitute an achromatic lens. In order to reduce the deterioration of focusing performance caused by changes in temperature, these two lenses are glass lenses and occupy the greater part of the power of the entire system. The sixth lens is an aspherical plastic lens for the correction of astigmatism and frame aberration, and the seventh lens is a plastic lens for the correction of image field curvature, using an aspherical surface.