Matches 451 - 500 out of 586 < 1 2 3 4 5 6 7 8 9 10 11 12 >
Match Document Document Title
4561333 Diamond turning method for high-precision metal mirror  
High-precision turning of a metal mirror is accomplished by causing a measuring beam to be reflected on a freshly turned area of the reflecting surface to be formed in a metal blank being turned to...
4558948 Process and apparatus for measuring wave surface distortions introduced by an optical system  
The invention relates to an apparatus for measuring the wave surface distortions introduced by a lens, comprising a source which emits coherent light of frequency νo; means for creating a...
4549081 Spectrophotometer for measuring absorption characteristics of a complex lens  
A method and apparatus for measuring the absorption characteristics of complex lenses to light from a selected band of wavelengths, preferably wavelengths in the ultraviolet range, is disclosed....
4545678 Method and apparatus for testing lenses  
The invention concerns a method and apparatus for testing aspherical lenses, particularly continuous-focus eyeglass lenses. The negative picture (7) of a test pattern (1) is produced by means of a...
4531835 Method for detecting F-number of lens  
A method for detecting optically an F-number of an interchangeable imaging lens is disclosed. An image of an exit pupil of the imaging lens is projected onto an array of photoelectrically...
4526467 Apparatus and methods for testing lens structure  
Apparatus and method for testing the optical throughput or efficiency of lens structures adapted to be used in pairs to make a connection between optical fibers by imaging one fiber end, serving as...
4523842 Asperic surface test fixture  
An optic surface apparatus capable of handling aspheric surfaces uses dir measurement of the blur circle of the image created by the test surface. Direct measurement of the blur circle is obtained...
4514086 Apparatus for measuring refractive properties of lenses and other transmissive devices  
An apparatus for measuring refractive properties of transmissive elements such as ophthalmic lenses, including a mirror or deflective surface supported for adjustable movement in X and Y directions...
4496242 Apparatus for positioning a contact lens under a radiuscope  
A device for positioning the curved surface of a lens beneath a radiuscope provides a variable distance between the lens surface and a pivot point for the lens to thereby accommodate lenses having...
4429992 Method and device for testing optical imaging systems  
Optical imaging systems are used for making microstructures, and have to be very precise. In order to test these imaging systems, a new method, and a device for carrying out this method, are...
4415076 Soft contact lens container  
A soft contact lens container is disclosed for the immersion, preservation, optical measurement, shipping and dispensing of soft contact lenses. The container has an overall cylindrical shape with...
4410267 Hand-held lens meter  
A hand-held lens meter including first and second optical systems mounted in a substantially Y-shaped hand-holdable body is disclosed. The first optical system includes a target, a lens rest and an...
4410268 Apparatus for automatically measuring the characteristics of an optical system  
An apparatus for measuring the optical characteristics of an optical system includes a light source, a collimator lens, a mask, a detector, and a circuit for measuring information received from the...
4409475 Spatial frequency filter  
A spatial frequency filter including: an optical system having detector means and means for projecting onto the detector means an image of an object area; and means for operating the optical system...
4402602 Knife edge system  
An improved knife edge system which enables testing of even high numerical aperture optics is achieved by using a microscope objective to gather the light from a small pinhole and fill a large...
4386849 Method of moire-metrical testing of optical imaging systems  
A method for testing optical imaging systems by the use of moire stripes, wherein two copies of an optical grating are made and simultaneously illuminated to produce a moire pattern which is a...
4334773 Clip-on lens target  
A clip-on lens target (10) is disclosed which is suitable for attachment to an elongated light source, such as a fluorescent light (12). The target (10) is attached to the light source (12) by a...
4329049 Median point detecting apparatus for a lensmeter  
A lensmeter is disclosed for determining the refractive properties of a test lens, including an optical system to produce an ellipse of light at a detecting plane having information of such...
4324459 Optical test pattern  
A stelliform arrangement of sectors each having a uniform optical density and with different sectors having different optical densities.
4299482 Measurement of windscreen distortion using optical diffraction  
A measurement apparatus and method for detecting, resolving and quantifying the distortion caused by a relatively large region of a distorting optically transparent medium. A precisely defined...
4281927 Apparatus for indicating maximum resolution for projected images  
There is disclosed a maximum resolution indicator for photographic apparatus. The indicator utilizes a photocell which is scanned by a rotating disc having an aperture located on a surface thereof...
4281926 Method and means for analyzing sphero-cylindrical optical systems  
An improved method for finding the refractive properties of lenses includes placement of the test lens in an optical system such that its image lies in a plane at which light passes through at...
4274737 Test patterns for lens evaluation  
Lens testing charts using a vernier pattern, a sawtooth pattern, and a sinusoidally varying reflectance pattern are described and are used in conjunction with a lens under test to be focussed by...
4272190 Optical measuring system  
Automatic test equipment for determining the optical properties of a test object is described. A highly collimated test beam of approximately one millimeter diameter is directed through the test...
4260252 Method and apparatus for immobilizing a contact lens  
A method and apparatus for immobilizing a contact lens without distortion to facilitate accurate measurement of its physical dimensions. The lens is floated on the surface of a liquid just out of...
4247200 Projection type lens meter  
A projection type lens meter comprises a projection lens system consisting of a positive lens group and a negative lens group mutually separated by a large air gap, wherein the projecting light...
4247201 Spectacle prescript lens distortion tester  
A visual test target is disclosed which is useful for determining whether a subject's vision is being distorted by previously prescribed spectacle lenses. The target comprises two concentric...
4241996 Apparatus for measuring the quality of optical equipment  
The invention is an apparatus for determining the quality of optical equipment through measurement of the modulation transfer function of the equipment. The apparatus includes an elongated, opaque...
4236821 Method and apparatus for testing optical retrodirective prisms  
Retrodirective optical prisms are tested for light reflection and efficiency by generating two substantially co-axial beams of light, a signal beam and a reference beam. The beams are passed...
4232966 Contact lens device  
A device for supporting a contact lens in any desired position with relation to an optical instrument to enable the parameters of the lens, especially the curvature and/or the axes of the surfaces...
4213701 Lens testing apparatus and method  
An apparatus and method for measuring the dioptric power, resolving power, and astigmatic power of small lenses, and particularly for testing the acceptability of surgically implantable intraocular...
4209252 Optical probe assembly for detecting the position of an object surface and method  
An optical probe assembly for detecting the position of an object surface, especially the position of a three-dimensional, curved surface such as a surface in a contact lens or the cornea of the...
4203666 Lensmeter  
An improved lensmeter comprising a conventional optical system and a novel displaying system. The displaying system includes a linear encoder producing two sets of pulse signals equivalent to the...
4199816 Optical calibration apparatus and procedure  
A process and apparatus for the calibration of an optical instrument. An optical instrument--such as a lens meter or ophthalmometer--is provided with a light source, a light detector, and an...
4171910 Retroreflectance measurement system  
A retroreflector evaluation system is disclosed as incorporating a laser and a plurality of laser light processing optical elements associated therewith in such manner as will permit the making of...
4149801 Method and apparatus for measuring aspheric contact lens surfaces  
This invention consists of an improvement in known measuring microscopes and the method of use of such microscope for measuring radii of curvature of contact lens surface areas by catoptric...
4125328 Apparatus for measuring reflectivity and transmissivity of a specimen  
An apparatus for measuring reflectivity or transmissivity of a specimen has a source of light fixed to a base, a variable angle specimen frame receiving the light in a narrow beam and transmitting...
4123778 Method of and apparatus for determining the sharpness of a picture  
Method and apparatus for determining the sharpness of a picture through evaluation of the absolute values of the density differences between adjacent points of the image in at least one selected...
4110046 Optical apparatus and method  
Optical test apparatus and method for testing various parameters of a lens system such as a T.V. lens system. A single apparatus may be used for testing the modulation transfer function, glare,...
4102580 System for the measurement of ultra-low stray light levels  
An apparatus for measuring the effectiveness of stray light suppression light shields and baffle arrangements used in optical space experiments. The light shield and baffle arrangement and a...
4099877 Lens testing method and apparatus  
A lens testing method and apparatus is disclosed to test the transfer function of a lens at a multiple number of points in the lens and to locate the best focal plane and format position of the...
4089607 Optical interferometer  
An optical interferometer for use in observing the optical quality of a relatively large area of a mirror of any shape is disclosed. The disclosed interferometer comprises an arrangement for...
4077721 Apparatus for measuring holographic lens aberration parameters  
An instrument for measuring various and sundry parameters that are analog to the aberrations that may exist in holographic lenses and other energy diffraction apparatus is disclosed as containing:...
4060328 System for measuring the modulation transfer function of an optical device  
A slit image is projected through the optical device being measured and onto the optical input screen of a variable-gain photomultiplier tube. Before it is incident upon the input screen of the...
4046463 Indicating an asphericity of the cornea of an eye  
A circular array of twelve light sources transmit light to an eye. A spherical shape of the cornea of the eye is indicated when light reflected therefrom appears to be transmitted from twelve...
4035082 Method to test for chemically hardened glass lenses  
A device to test for the presence of chemically hardened glass wherein a collimated light source and a windowed container are filled with a fluid of refractive index substantially equalling that of...
4007990 Apparatus and method for measuring refractive properties of a sphero-cylindrical optical system  
Apparatus and method is disclosed for measuring refractive properties such as spherical power, cylindrical power, cylindrical axis, etc., which are potentially present in a sphero-cylindrical...
3988068 Method and apparatus for detecting cosmetic defects in opthalmic lenses  
Method and apparatus for detecting and analyzing cosmetic defects on the surface of ophthalmic lenses. The apparatus according to one embodiment comprises means for scanning a narrow beam of light...
3977789 Scanning differential photoelectric autocollimator  
An apparatus is disclosed which automatically measures the geometrical deviations of a reflecting surface from a reference surface, and which also can be used to automatically measure the...
3977795 Method of determining the modulation transfer function  
The invention relates to a method of determining the modulation transfer function of a recording support or of an optical system. In the context of the invention, an optical system includes any...
Matches 451 - 500 out of 586 < 1 2 3 4 5 6 7 8 9 10 11 12 >