Patent ID: 6722944
Filing Date: 2004-04-20
Classification: B24B,B29D

Abstract:
A method for attaching a lens holder to an uncut lens for a spectacle lens, in a process for grinding an edge of the uncut lens using an apparatus for processing spectacle lenses under numerical control based on processing data including spectacle frame shape data, comprising the steps of:providing a lens holder comprising a jig operably attached to an uncut lens and defining a central axis of rotation of the uncut lens; forming an image of the uncut lens by an apparatus for image processing and obtaining one or both of (1) positions of hidden marks, placed at specific positions relative to a first reference position on the uncut lens, wherein the first reference position is predetermined by a design of a layout corresponding to prescription data and (2) a position of the edge of a segment, placed at a specific position relative to the first reference position on the uncut lens, wherein the first reference position is predetermined by the design of the layout corresponding to prescription data by processing the formed image; and obtaining a position outside of a range of processing interference by information processing of (1) data of positions of the hidden marks or the position of the edge of the segment, (2) the first reference position, (3) spectacle frame shape data and (4) lens holder-lens buildup area shape data, using a computer; designating the obtained position as a position for attaching the lens holder to the uncut lens; and attaching the lens holder at the obtained position; wherein the range of a processing interference is a range where a portion of the lens holder extends beyond the shape of the spectacle frame so as to hinder processing of the uncut lens, and wherein the uncut lens is either a progressive multifocal lens having a progressively changing dioptric power or a multifocal lens having a segment integrally formed on a main lens of the uncut lens.