MEASUREMENT OF THE TOPOGRAPHY AND/OR THE GRADIENT AND/OR THE CURVATURE OF A LIGHT-REFLECTING SURFACE OF A SPECTACLE LENS

摘要

A device (10) for the measurement of the topography and/or the gradient and/or the curvature of a light-reflecting surface (12) of a spectacle lens (14) arranged in a receiving section (16) has a light source (22) and a detection device (32) for detecting a brightness distribution (30) on a detection surface (28) which distribution is brought about on the detection surface (28) by the light (15) of the light source (22) reflected on the light-reflecting surface (12). According to the invention, the device (10) includes a scanning device (11) for applying at least one directional light beam (24) from the light source (22) to the light-reflecting surface (12) in different locations (25) by the relative movement of the at least one light beam (24) and the spectacle lens (14) relative each other. The device (10) comprises an arithmetic unit (36) for calculating the topography and/or the gradient and/or the curvature of the light-reflecting surface (12) from the brightness distribution detected on the detection surface (32) by the detection device (32) during application of at least one directional light beam (24) from the light source (22) to the light-reflecting surface (12) in different locations (25) and from the information on the direction of the at least one directional light beam (24) as well as from the information on the location of at least one point on the light-reflecting surface (12).