Abstract:
A method and apparatus for substantially nullifying vibration and deflection in a single point lens turning lathe (100) having a rapidly reciprocating lens cutting tool (114) and shuttle assembly. The apparatus includes three or more tool shuttles (108, 110, 112) of similar mass mounted for reciprocating movement along respective generally parallel shuttle paths. The shuttles (108, 110, 112) are reciprocally moveable by respective actuators (118, 120, 122) along their respective shuttle paths. The shuttle and tool assemblies are moved by their respective actuators (118, 120, 122) in opposite directions at a rate which causes forces generated by shuttle and tool assemblies moving in one direction to cancel forces arising from the shuttle and tool assembly movement in the opposite direction. Should an odd number of shuttle and tool assemblies be used, the amount of force generated by the mass moving in one direction may be compensated by having a different rate of movement, and hence a different stroke length from the mass moving in the opposite direction.
Abstract:
The invention relates to a method for treating spectacle glasses by means of a CNC-controlled spectacle glass treatment machine. The inventive method comprises the steps: mounting the raw glass (9) on a holder (20) in the spectacle glass treatment machine; treating an optical surface and/or the edge of the raw glass (9) according to predetermined values which are optical and/or relate to the form; checking the position of the raw glass (9) on the holder (20) continually or at intervals during treatment by means of a sensor and including an optionally detected dislocation of the raw glass (9) on the holder (20) continually or at intervals in the values for spectacle glass treatment.
Abstract:
The invention concerns a method for making an ophthalmic lens surface. It comprises steps which consist in: a) machining the surface by material removal by moving a cutting tool along a continuous path to produce grooves, two adjacent grooves being spaced by a constant pitch ranging between 0.01 and 3 mm, and b) smoothing the machined surface by moving a smoothing tool along a continuous path consisting of runs, two adjacent runs being spaced by a constant pitch ranging between 0.2 and 3 mm, to produce a pass band filtering for the undulations of said surface between a low frequency corresponding to a surface envelope to be achieved and a high frequency corresponding to a base roughness.
Abstract:
Optical surfaces with complex geometry are produced today by grinding, polishing or casting in a prefabricated negative mould. This has the disadvantage that all geometric moulds required for production must be kept on stock. The object of the invention is to disclose a process that allows these optical surfaces and moulding shells to be directly manufactured in a single step according to inddividual data. For that purpose, a blank for machining an optical surface or a blank of a moulding shell for manufacturing optical surfaces is held at the workpiece carrier of a spindle axis (Z axis) of a shaping machine and is directly turned into its final form by means of a turning tool which can move relative to the blank (in the X axis). The turning tool can move transversely to the direction of displacement of the tool. During each rotation of the spindle, the turning tool is incrementally adjusted towards or away from the blank depending on the characteristic surface data, which may be predetermined or calculated on-line. This process is particularly suitable for directly manufacturing plastic lenses and moulding shells for producing plastic lenses, for example progressive lenses.
Abstract:
A workpiece and a tool whose processing surface includes a catalyst substance containing a transition metal which supports hydrolysis of a surface to be processed of the workpiece are relatively moved in a state of being press-contacted by a processing pressure with a water molecule of a processing fluid being interposed. During the processing, processing control of managing a relative speed of relatively moving the processing surface and the surface to be processed or the processing pressure is performed by a control unit. A processing rate of the surface to be processed is estimated by an estimation expression indicated by a difference between a member formed of a product of a first constant, the processing pressure and the relative speed and a member formed of a product of a second constant and a cube of the relative speed. Then, the relative speed is managed based on the estimated processing rate.
Abstract:
The present invention relates to a method for transforming an initial progressive ophthalmic surface which has to be manufactured by a manufacturing method, the transformation method comprising: • a step of selecting a manufacturing method intended to be implemented, in which said manufacturing method introduces a reproducible surface defect, • a step of selecting a predictive model of said reproducible surface defect, • a step of selecting an initial progressive ophthalmic surface S intended to be manufactured, • a step of determining (S1), during which there is determined, by means of said predictive model, a surface defect value D which would be introduced if the initial progressive ophthalmic surface S were produced by said manufacturing method, • a transformation step (S2), during which said initial progressive ophthalmic surface S is transformed into a transformed progressive ophthalmic surface S* by compensating the defect value D determined during the step (S1), such that the subsequent manufacture of the transformed ophthalmic surface S* by said manufacturing method makes it possible to obtain a progressive ophthalmic surface which substantially conforms to the initial progressive ophthalmic surface S.
Abstract:
The invention concerns a process for measuring and/or controlling a polishing process of an ophthalmic element (1) comprising the steps of -manufacturing at least two cavities (2, 3) on the surface of the element to be polished, the depth of the first cavity (2) being smaller than the depth of the second cavity (3) -operating the polishing process -considering the element (1), in order to check that the first cavity (2) is suppressed and that the second cavity (3) is present.
Abstract:
Es werden eine Vorrichtung (1), ein Werkzeug (5) und ein Verfahren zum Bearbeiten, insbesondere Polieren, einer optischen Linse (2) mittels eines Werkzeugs (5) vorgeschlagen, wobei ein Informationsträger (14) auf einer Arbeitsfläche des Werkzeugs (5) optisch erfasst und beim Bearbeiten der Linse (2) abgearbeitet und dadurch der Zustand des Werkzeugs (5) angezeigt wird.
Abstract:
The present invention relates to an apparatus for polishing an object into a large-diameter optical lens based on inputted data. The polishing apparatus comprises: a base frame on which various components are installed; a rotatable turntable installed on the base frame for placing and fixing the polishing object; a turntable rotation unit that is installed on the bottom of the turntable and allows rotation thereof; a tool moving body which is rotatable in the horizontal direction with respect to a rotation shaft, wherein one end thereof is coupled to the rotation shaft installed on one side of the top of the base frame and connected to the other side of the top of the base frame; a tool moving body rotation unit that is installed on the other side of the top of the base frame and guides the end of the other side thereof along the one side of the top frame; a tool mounting body mounted on the bottom of the tool moving body; a tool moving unit that controls the movement of the tool mounting body along the longitudinal direction of the tool moving body; a central processing unit operating the turntable rotation unit, the tool moving body rotation unit, and the tool moving unit based on the inputted data; and a data input device that inputs data on the operation of the turntable rotation unit, the tool moving body rotation unit, and the tool moving unit.