Patent ID: 7175277
Filing Date: 2007-02-13
Classification: G02C,G05B,Y02P

Abstract:
1. A system for generating design data of an inner surface progressive addition lens which includes a distance portion and a near portion each having different powers, and a progressive portion whose power progressively changes between said distance portion and said near portion, an inner surface of the progressive addition lens having curvatures respectively corresponding to said distance portion, said near portion and said progressive portion, said system comprising: a prescription data acquisition unit for acquiring prescription data containing optical characteristics of the inner surface of the progressive addition lens; a reference design data storage memory for storing a plurality of reference design data corresponding to addition power of the inner surface of the progressive addition lens; a reference design data selection unit for selecting reference design data from among said plurality of reference design data stored in said reference design data storage memory in accordance with said prescription data acquired by said prescription data acquisition unit; and an arrange design unit for processing said selected reference design data on the basis of said prescription data; wherein said reference design data stored in said reference design data storage memory includes a point group having coordinates of lattice points prepared by dividing the progressive surface as a reference into a lattice form.