2511results about "Optical surface grinding machines" patented technology

An ultrasonic-magnetorheologic polishing method features that the mixture of abrasive material and magnetorheologic liquid is filled in a small-diameter rotary hollow polishing head and a magnetic field is applied to it to make the magnetorheologic liquid become flexible polishing liquid on the polishing head while the ultrasonic vibration is applied to it for higher polishing effect. Its apparatus is composed of polishing head, ultrasonic generator, and electromagnet.

The efficient numerically controlled polishing process and apparatus for great aperture aspherical optical elements belongs to the field of precise optical machine technology. The polishing process includes: constituting polishing process model based on the profile data obtained through measurement with interferometer or other instrument, determining the machining path, speed, pressure and other parameters of the element under the control of computer to perform simulating machining, verifying the technological parameters based on the simulating machining results and determining the ultimate technological parameters, creating NC program and machining. The present invention has high machining efficiency and high machining precision.

A system and method for specifying a vision correction prescription for a patient's eye, wherein in one embodiment, the method includes obtaining a wavefront aberration measurement of the patient's eye, applying at least one value from the wavefront aberration measurement to a statistical model trained using a plurality of objectively measured aberration values and a plurality subjectively measured visual acuity values as training data; and predicting a vision correction prescription for the patient's eye based on the at least one value and the statistical model.

The invention relates to a magnetic rheology buffing device, in particular to a high efficiency controllable multiple wheel head magnetic rheology buffing device. The device mainly comprises a main shaft and a clamping device thereof, a revolving platform device, a digital control device, a magnetic field generating device and a liquid circulation device. A work piece can be assembled in a round array structure of single ring or multiple rings according to buffing requirements, and the controllable magnetic field forms the round array structure of single ring or multiple rings which is matched with the work piece. The device has the advantages that efficiency is high, the multiple wheel head is controllable, magnetic rheological fluid on the surface of a buffing pad is distributed evenly, multiple work pieces can be processed simultaneously, and operation is convenient.

A method of manufacturing progressive power spectacle lenses includes preparing individual fitting condition data for a lens-wearer such as object distances for near and distance vision, the distance from the point-of-rotation of each eyeball of a lens-wearer to each spectacle lens, the pantoscopic angle of the spectacle lenses when fitted onto said lens-wearer, and determining an amount of inset in accordance with said individual fitting condition data.

The invention relates to a magnetic rheological polishing device used in an aspheric optical part with a super large caliber, comprising a machine tool, a magnetic rheological polishing device and a control system which is connected with the above components. The machine tool comprises a lathe bed on which the work piece to be processed is placed, an X axial linear motion mechanism is arranged on the two sides of the lathe bed, a movable portal is fixed on a slider of the X axial linear motion mechanism, a Y axial linear motion mechanism is arranged on a cross beam of the movable portal, a Z axial linear motion mechanism is fixed on a slider of the Y axial linear motion mechanism, an A axial rotary table used for arranging the magnetic rheological polishing device is fixed on a slider of the Z axial linear motion mechanism, the magnetic rheological polishing device is fixed on the cross beam by a fourth linear motion mechanism, the two have opposite directions of motion, and the magnetic rheological polishing device is arranged right above the work piece to be processed. The device of the invention has the advantages of simple and compact structure, low cost, easy control and strong processing capacity, and can process the aspheric optical part with the super large caliber.

A method for fabricating a light emitting array utilizes a precisely shaped patterned abrasive to abrade optical material. One or more patterned abrasives contact and abrade along one or more intersecting axes of the optical material. The resulting precisely shaped and located optical elements are aligned with and bonded to an array of light sources.

Production information such as an edging mark 31 indicating a region of a lens remaining after edging and reference position marks 32 are depicted in a region, to be cut off by the edging, of a surface of a lens 10 for spectacles. Any production information does not remain on the finished lens 10 after the edging. A lens processing system 100 includes a reference position detecting apparatus (120 and 130) for detecting a reference position of a spectacle lens, and a marking apparatus (170, 160, 150 and 110) for depicting production information of the lens on a specific surface of the spectacle lens on the basis of the reference position information obtained by the reference position detecting apparatus (120 and 130).

The invention belongs to the technical field of precision optical polish finish, in particular to a polishing method of the inner concave surface of optical elements and a polishing device. A core mould with a tank circuit and inosculating with the shape of the inner concave surface to be processed is fixed below the inner concave surface of a work piece to be processed, and the work piece rotates around the own rotary shaft, keeps a micro clearance from the core mould and applies magnetic fields to processing regions by an external magnetic pole tool head and an internal magnetic pole exciting coil. When magneto-rheological fluids with polishing abrasives flow through the processing region along the tank circuit, a flexible polishing head is formed under the action of magnetic field and absorbed on the inner concave surface and polishing effects are generated. The polishing method and the device can realize the inner concave surface polishing of conformal optical elements with small curvature radiuses or deep cavity structure and other cyclically symmetric high gradient aspheric surfaces, and can remove distribution by utilizing computer-controlled polishing, and besides the polishing method and the device have the polishing surface shape control ability and both the advantages of high precision and high surface quality.

The invention discloses a combination machining method for removing high-frequency errors in optical elements. The combination machining method includes measuring surface shape errors of an optical element to be machined by an interferometer, carrying out PSD (power spectral density) analysis, and determining distribution characteristics of the medium and high-frequency errors on the basis of a DSD curve; acquiring an optimized removal function model according to predetermined machining time and machining precision, and acquiring an amplitude spectral line of a removal function; acquiring cut-off frequency of the removal function according to the amplitude spectral line; machining by a magneto-rheological finishing process if correctable medium and high-frequency errors with the frequency lower than the cut-off frequency exist according to the frequency distribution of the medium and high-frequency errors; and machining by a computer controlled optical surfacing process if uncorrectable medium and high-frequency errors with the frequency higher than the cut-off frequency exist according to the frequency distribution of the medium and high-frequency errors. By the combination machining method, technical advantages of MRF (magneto-rheological finishing) and technical advantages of CCOS (computer controlled optical surfacing) can be sufficiently combined, efficient uniform convergence of all-band errors of the optical element can be realized, and performance of the optical element is effectively improved.

A method and a device for polishing a magneto-rheological inclined shaft relate to the technical field of precise finishing machining. A polishing tool head and the axial direction of a workpiece have an angle so that the normal of the working arc of the polishing tool head is coincident with the polishing surface normal of the workpiece; the shell of the polishing tool head rotates; furthermore, the rear end of the shaft in the shell passes through the hollow shaft of an adjustable speed motor and is fixedly connected with a machine body; the fixed shaft is provided with an excitation device; one part of the small front area of the shell of the polishing tool head is provided with a magnetic field and the other part thereof has no magnetic field or has weak magnetic field, thus facilitating updating the magneto-rheological liquid; the contact point of the workpiece and the magneto-rheological point is always the normal direction of the polishing area of the workpiece; the shell of the polishing tool head rotates and the magneto-rheological body generates a high shearing force at the clearance between the polishing tool head and the workpiece, thus removing trace of the material. By adopting the inclined shaft polishing, the interference is prevented from being generated; by planning path and controlling relevant parameters, the specific ultra-precise polishing process can be carried out to the surfaces of minitype non-spherical optical parts, dies and workpieces of general dimensions.

The invention relates to a milling, grinding and polishing device based on an intelligent numerically-controlled platform, belonging to the technical field of modern optical processing. The device comprises an industrial robot, a control module, a driving module, a human-computer interaction interface, a working component, a polishing and cooling liquid cyclic control system and a sucker clamp, wherein the control module and the driving module control and drive the spatial movement and spatial positioning of the industrial robot, thereby controlling the working state of the working component, namely a grinding/polishing module; the control module also controls the human-computer interaction interface and simultaneously controls a stirring device, a temperature control device and a conveying device of the polishing and cooling liquid cyclic control system; and the sucker clamp is used for clamping a workpiece to be processed. The device of the invention has low manufacturing cost, large processing caliber and wide processed surface types, and two functions of grinding and polishing can be realized by replacing grinding heads.

The invention concerns a method for producing ophthalmic lenses that uses plastic blanks in the form of flat, round discs. The outer edge of said plastic blanks is clamped and the desired final surface geometry and surface quality of the front faces of the lens are subsequently produced by a machining process using grinders and/or lathes and by smoothing and polishing processes. During machining, a thicker annular region is retained on the outer circumference of the workpiece. The annular region clamps or arranges the workpiece during machining and transport operations and stabilizes the lens for additional machining. Shaped pieces for identifying the machining axes are attached to the annular region. The lens is provided with fine markings to characterize the lens that has been produced, with the lens then being separated from the region.

A tool for polishing objects having a wide variety of materials and shapes including precision optical surfaces, injection mold inserts, and thin film coating dies. The tool has an elastic solid bladder with a curved surface, upon which is disposed an abrasive band. The curved bladder surface is produced by compressing the bladder between two parallel plates. The apparatus comprises a multi-axis computer controlled machine to which the tool is attached.

The invention discloses a five-axis three-dimensional ultrasonic polishing machine tool for optical curved surface machining. The five-axis three-dimensional ultrasonic polishing machine tool comprises a machine tool, an ultrasonic atomization device for applying polishing liquid and a workpiece on-line detection device. An X-direction travel mechanism, a Z-direction travel mechanism and a Y-direction travel mechanism are arranged on the machine tool; a spindle ultrasonic vibration polishing device is arranged on the Z-direction travel mechanism; a Y-direction ultrasonic vibration device is arranged on the Y-direction travel mechanism; a C-direction rotating work table is arranged on the Y-direction ultrasonic vibration device; the machine tool can enable the axis line direction of a polishing head parallel to the normal line of a polishing point of a workpiece through five-axis linkage; when the polishing head rotates, the ultrasonic wave of the Y-direction ultrasonic vibration device and the ultrasonic wave of the ultrasonic vibration polishing device which swings around the Z direction are vertically coupled in a plane; when the amplitude A1 of the Y-direction ultrasonic vibration device is greater than the amplitude A2 of the ultrasonic vibration polishing device, the polishing head and the workpiece can form an elliptic machining track where a long axis is in the Y-direction and a short axis is in the normal line position of the polishing point of the workpiece, so that the contact area between the polishing head and the workpiece is increased, and the curved surface removal rate and the polishing machining efficiency can be greatly improved.

The present invention discloses optical element processing technology, and is especially processing method of aspherical optical element of optical glass and silicon monocrystal. The present invention features that optical glass and silicon monocrystal is processed in computerized numerically controlled grinder and computerized numerically controlled polishing machine through a new technological process including the steps of fine grinding of aspherical, polishing of aspherical, trim polishing of aspherical, profile detection, etc. The present invention is superior to traditional method, and has low production cost, stable quality and high efficiency.

The invention discloses an MR polishing slurry cycle device which has longtime and stable polishing slurry performance. The liquid mixture tin is connected with the water tank through a metering pump and the cooling machine is connected with the liquid mixture tin through the cooling pipe; a polishing slurry circulation loop consists of the successively connected liquid mixture tin, electromagnetic flow meter, nozzle, recovery unit and recovery pump through a polishing circulation pipeline and a non-polishing slurry circulation loop consists of the successively connected liquid mixture tin and electromagnetic flow meter through a non-polishing circulation pipeline. The polishing slurry circulation loop and the non-polishing slurry circulation loop are connected in parallel and a switching control valve is arranged at the junction. The lateral pipe between the liquid mixture tin and the switching control valve is surrounded with spiral coil; the electromagnetic flow meter and the spiral coil are connected with the input terminal of the computer, of which the control output terminal is connected respectively with the switching control valve, the cooling machine, the power pump and the metering pump. The device has the advantages of high control precision, sound stability, etc., and can provide low cost, reliable and stable MR polishing slurry for MR polishing processing for a long time.