Patent ID: 6088089
Filing Date: 2000-07-11
Classification: B24B,G01M

Abstract:
An apparatus for determining parameters of an ophthalmic lens comprising:a vertex refractometer having a lens support for the ophthalmic lens, the vertex refractometer having a measurement beam path which passes through the ophthalmic lens when the ophthalmic lens is lying on the lens support; anda detection device for optical detection of at least one engraved marking on at least one predetermined surface area of the ophthalmic lens, said detection device having at least one light source, an imaging optical system for directing light from the at least one light source onto the at least one predetermined surface area of the ophthalmic lens with at least one engraved marking, and an optical receiver system having a light sensor which is connected to an evaluation and representation unit, optical receiver system imaging light beams from the imaging optical system which are reflected from the at least one predetermined surface area of the ophthalmic lens;wherein the vertex refractometer and the detection device are disposed so that a spacing between an axis of the measurement beam path of the vertex refractometer and an axis of the optical receiving system of said detection device is selected so that when said ophthalmic lens is positioned relative to the measuring beam path passing through the ophthalmic lens, the at least one predetermined surface area with the at least one engraved marking of said ophthalmic lens is illuminated by said at least one light source of the detection device.