Abstract:
The invention relates to a linear drive and the use thereof for processing an optical workpiece, wherein the linear drive has a linearly movable rotor, a linearly movable compensation member and an electrical compensation drive for moving the compensation member oppositely to the rotor, and the rotor extends into the compensation drive and/or wherein a first bearing supports the rotor in a torsionally rigid manner and a second bearing supports the rotor in a rotatable manner.
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:
A method for processing an aspheric, in which a workpiece prepared for processing is fixed on a main rotation axis (2), and rotated by the main rotation axis, a cutter (6) whose swing angle q and swing radius R is changeable is setted opposite with the curved surface of the workpiece prepared for processing, the support point for the cutter swinging is on the center line of the workpiece prepared for processing, the main cutting edge of the cutter always be tangent with the curved surface during cutting.
Abstract:
The present invention is related to manufacturing surfaces with an axis decentered from the spindle axis. In particular, the present invention is related to compensating for tool geometry in cutting processes that involve an oscillating tool.
Abstract:
Method for machining a face (1) of an optical object (6), comprising a step of providing a machine tool which itself comprises: a bed (1) for locating an object to be machined, this bed (1), which has a receiving surface (3), being angularly adjustable about an axis perpendicular to the receiving surface (3); a spindle (8) suitable for rotating a machining tool (9) about an axis essentially parallel to the receiving surface (3) of the bed (1) and suitable for moving this machining tool (9) translationally in a plane essentially parallel or perpendicular to the receiving surface (3) of the bed (1).
Abstract:
The present invention is related to manufacturing surfaces with an axis decentered from the spindle axis. In particular, the present invention is related to compensating for tool geometry in cutting processes that involve an oscillating tool.
Abstract:
Method for machining a face (1) of an optical object (6), comprising a step of providing a machine tool which itself comprises: a bed (1) for locating an object to be machined, this bed (1), which has a receiving surface (3), being angularly adjustable about an axis perpendicular to the receiving surface (3); a spindle (8) suitable for rotating a machining tool (9) about an axis essentially parallel to the receiving surface (3) of the bed (1) and suitable for moving this machining tool (9) translationally in a plane essentially parallel or perpendicular to the receiving surface (3) of the bed (1).
Abstract:
A raster cutting apparatus and method for producing accurately formed, aspheric ophthalmic lenses having a good quality surface finish. The accurate form and good surface finish are obtained by using a substantially spherically shaped cutting tool having a large radius. The methods include utilizing a cutting path which provides substantially constant cutting-force, such as a constant surface-cutting-speed raster pattern.
Abstract:
A method and a too head (30) are used to machine optically active surfaces, particularly surfaces of progressive spectacle lenses, which are symmetrical in pairs. The spectacle lenses are rotated about a first axis and are displaced along said axis. A machining tool (38,48) is arranged and advanced in such a way that, when the spectacle lens is rotated, a cutting edge (39,60) of the tool (38,48) is guided along the surface about the first axis along a spiral path and along an elevation path defined by the form of the spectacle lens. In order to machine right spectacle lenses and left spectacle lenses, the right spectacle lenses are rotated about the first axis in a first direction of rotation and the left spectacle lenses are rotated in a second counter direction. The tool head (30) has clamping means (32,34) defining an axis (31) of the tool head (30), and is provided with a tool carrier section (36) on whose edge at least one pair (48R, 48L) of lathe tools (48R,48L) are provided. One lathe tool (48R,70R) of the pair (48R,48L) is oriented in one direction and the other lathe tool (48R,48L) of the pair (48R,48L) is oriented in the opposite direction. At least one of the lathe tools (48R,48L), preferably all of said tools, is provided with means of adjustment (52-57) which enable the point of engagement (62) of the rotary cutting edge (60) to be adjusted.