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4846578 |
Surface characteristic measurement
The measurement of surface characteristics such as distinctness-of-image glossiness and/or surface roughness of a sample is carried out by projecting an image of a pattern, reflected from the...
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4832451 |
Collimator targets
In the field of optics, collimators are adapted not only for testing, calating and measuring instruments, but for target projection and simulation. The technique is to use standard targets which...
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4822165 |
Device for illuminating components of transparent material in testing for irregularities
A device for illuminating components of transparent material by dot-scanning so that the components may be tested for surface irregularities and occlusions which comprises a component rotatably...
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4818108 |
Phase modulated ronchi testing of aspheric surfaces
An apparatus and method for measuring the surface contour of an aspheric optical surface 36. This is accomplished by splitting a single coherent beam of light into two individual beams with one...
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4815846 |
Toric soft contact lens holder
An apparatus for positioning a toric soft contact lens in relation to an optical measuring instrument includes discs for supporting the contact lens and a handle for rotatably holding the discs....
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4815844 |
Device for testing components of transparent material for surface irregularities and occlusions
A device for testing components of transparent material for surface irregularities and occlusions which comprises a mechanism for rotatably mounting the component so that the component may be...
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4799792 |
Method to test the polishing of a mirror and system to use this method
The invention pertains to a method to test the polishing of a mirror by means of a testing device, in a fluid through which rays of light are propagated homogeneously, and a system that puts this...
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4798460 |
Method and apparatus for detecting and modifying peripheral curves and junction ridges in contact lenses
Apparatus and method for detecting and modifying discontinuities on the ocular surface of a patient's contact lens by alternately observing the reflected image of one or more parallel opaque bands...
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4796991 |
Method and apparatus for measuring soft contact lenses
This invention relates to a method and apparatus for measuring the optical power of soft contact lenses having a lens holding apparatus which is mountable on known prior art lensmeter structures....
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4793709 |
Method and apparatus for measuring the losses of an optical cavity
A method and associated apparatus for measuring the intensity decay time of an optical cavity is particularly useful for accurate measurement of cavities of the type that include highly reflective...
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4787734 |
Stereoscopic microscope
A stereoscopic microscope including a stereoscopic optical system for observing an object under examination, an index projected on the object, a light-receiving unit for receiving an image of the...
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4787743 |
Apparatus for measuring the radius of curvature
A plurality of light sources are caused to impinge in predetermined directions onto an optical system to be inspected. The reflected beams from the optical system are received by two or more pairs...
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4784485 |
Contact lens zonometer
Apparatus to measure the size of an optic zone of a lens, particularly a contact lens or intraocular lenses, and the refractive power of that optic zone includes an illumination system with a light...
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4776684 |
Very large optical telescope
The invention concerns a very large optical telescope for observing light phenomena in the wave length region of about 0.3 to 30 or even to 300 μm. To realize a very large filled aperture it is...
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4772120 |
Determination of the transfer function of an optical instrument
For measuring the optical transfer function of an optical instrument having an input pupil, a device comprises a source of spatially coherent light for illuminating the pupil of the instrument. Two...
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4772119 |
Device for detecting a magnification error in an optical imaging system
A device is described for detecting a magnification error in an optical imaging system comprising a lens system (L 1 , L 2 ) which is telecentric at one side. Two gratings (RG 1 , RG 2 ) arranged...
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4772115 |
Illuminated ring keratometer device
A device for causing concentric circles of illuminated light to be reflected from the human cornea. The device includes a cylindrical surface which is open at both ends. At one end the eye looks...
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4767215 |
Lens characterization apparatus and method
A beam of light, such as a laser, is used to scan across a lens. The beam passing through the lens is modulated by an optical encoder which controls the amount of the beam passing through the...
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4759626 |
Determination of best focus for step and repeat projection aligners
A reticle design is provided for step and repeat projection aligners which, when patterned on a wafer (10), allows quick macroscopic evaluation of best focus for used in fabricating integrated...
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4741617 |
Method and apparatus for measuring, magnification power of a magnifying aid
An apparatus (10) for measuring the magnification power of a magnifying aid (14) is disclosed. The apparatus (10) includes an optical system (12) having an objective lens (34) focused at infinity...
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4738530 |
Inspection device
An inspection device for visually ascertaining the desired alignment of a contact lens in a tinting fixture comprises a base and a platform having a flat surface and mounted to the base for...
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4732470 |
Parallax error measurement device
The Parallax Error Measurement Device (PEMED) is an instrument used to mere parallax error associated with military night sights and other sights containing reticles. The PEMED consists of the...
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4730924 |
Lens meter and method of measurement of progressive multifocal lens using the same
Lens meter and method of measurement of progressive multifocal lens using the same which is able to set the amount of movement of the lens and to simply position a far- or near-distance refraction...
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4710023 |
Measurement of contact lenses
One or more optical parameters of a contact lens can be measured with the lens contained in aqueous fluid sealed in a sachet of optically acceptable plastics film.
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H000376 |
Degradation monitor for laser optics
Refractive elements typically have ground glass edges in areas where the perly-transmitted laser beam does not impinge. Defects on either incident optical surface or the exit optical will produce...
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4701606 |
Projection optical apparatus
A projection optical apparatus adapted for use in lithographic apparatus for semiconductor device manufacturing purposes and the like. A monitoring light beam of a given polarization is introduced...
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4696569 |
Method of measuring spherical aberration and apparatus therefor
An optical testing method and apparatus employing a non-interferometric technique, making use of axial intensity information, in which the intensity of the light pattern along the optical axis is...
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4684246 |
Soft contact lens analyzer
A soft contact lens measuring device. A cylindrical lens support defines a cavity and pedestal for immersing a soft contact lens in a saline solution. A piston engages the support and can be...
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4673818 |
Roughness measuring apparatus
A surface roughness measuring apparatus employing a molded Coblentz Sphere and a pair of matched photovoltaic sensors of wafer-thin rectangular configuration to allow the sensor used to detect...
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4669874 |
Borescope calibration
In the present invention, a support positions a target within the field of view of the borescope. The target is in the focal plane of the borescope and contains a series of parallel images of...
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4667103 |
Universal wavefront sensor apparatus
A wavefront sensor apparatus for a large optical system, such as a telescope, having a reticle with at least one slit therein to provide image signatures for various portions of the aperture to an...
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4660983 |
Apparatus for measuring reflectivities of resonator facets of semiconductor laser
An apparatus for measuring the reflectivities of the resonator facets of a semiconductor laser when the facets are covered with a protective coating of dielectric material or the like, which...
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4653909 |
Sinusoidal determination of limiting optical resolution
An optical system limiting resolution determination arrangement employing sinusoidal intensity modulated bar pattern input stimuli including two sequences for determining the modulation transfer...
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4653923 |
Focusing method for interferometer
A focusing method for interferometer wherein a light flux passing through a converter lens for converting the shape of wave fronts is caused to be incident on a tested surface and a testing light...
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4641962 |
Aberration measuring method
In aberration measurement, a light beam from a light source provided at the image plane position of a lens to be examined is caused to enter the lens to be examined, the light beam passed through...
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4641963 |
Back-illuminated CCD imager adapted for contrast transfer function measurements thereon
Stripe patterns of varying spatial frequency, formed in the top-metalization of a back-illuminated solid-state imager, facilitate on-line measurement of contrast transfer function during...
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4641961 |
Apparatus for measuring the optical characteristics of an optical system to be examined
In an apparatus for measuring the optical characteristics of an optical system to be examined a light source determines a reference optical axis and generates a light beam that is passed through...
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H000220 |
Optical performance comparator
Improved measurement of optical material degradation is provided by a comator utilizing a vidicon focused upon an illuminated white contrast target card. The optic under test is positioned between...
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4639132 |
Direct determination of modulation transfer function by moire deflectrometry
A system and method for determining modulation transfer function (MTF) of an optical element or system employs a moire deflectometer. A selected central portion of monochromatic light is directed...
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4637720 |
Lens meter having a focusing indication system with divided-image registration focusing
A lens meter having a focusing indication system with divided-image registration focusing comprises a condenser lens, a target having a nondiffusing transmissive surface and a slit pattern thereon,...
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4623249 |
Container for an optical element
A device for storing an optical element is disclosed. The device includes two sets of optical surfaces for allowing examination of an optical element in two directions. The device is preferably...
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4620790 |
System for determining optical aberrations of a telescope optical system
This invention is directed to a new and improved system for determining optical aberrations, such as for example alignment, focus, tilt, astigmatism or coma of a telescope optical system, wherein...
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4613232 |
Measuring device for testing optical systems of an endoscope
A portable measuring device for testing optical systems of an endoscope consisting of a base plate, a rail with a longitudinally extending V groove for receiving a portion of the endoscope being...
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4609287 |
Method of and apparatus for measuring refractive characteristics
At least three light beams are applied to different positions on an optical element to be measured. The light beams coming via the optical element to be measured are received through a...
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4601575 |
Apparatus for measuring the characteristics of an optical system
An apparatus for measuring the optical characteristics of an optical system includes a light source, collimator means for collimating a beam of light from the light source, a mask means, a means...
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4595288 |
Method and apparatus for measuring deep mirrors
A measuring apparatus (11) for measuring the contours of a deep mirror (10) includes a laser (14) for generating a light beam (20). The light beam impinges upon a reflecting surface (16) for...
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4586817 |
Method for determining the MTF of a viewing window
Method comprises producing a pattern of alternate light and dark areas along a particular path on the back surface of a viewing window, scanning the image of the pattern along the projected path...
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4585342 |
System for real-time monitoring the characteristics, variations and alignment errors of lithography structures
A system for evaluating and measuring the performance of lithographic structures, and more particularly for monitoring the optical parameters of a projection lithography system which uses the...
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4582427 |
Test target for adaptive optics
A test target for adaptive optics comprising, in the preferred embodiment, a plurality of nine adjacent, stacked, and aligned rows of a multiplicity of alternate opaque sections and transparent...
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4571085 |
Reflectometer based on optical cavity decay time
A method and apparatus for making decay time measurements of an optical cavity having at least two reflecting optical elements by directing a beam of light into the cavity, switching the beam of...
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